Make yourself visible and let companies apply to you.
Roles
Kotlin Jobs in London
Overview
Looking for Kotlin jobs in London? Explore the latest Kotlin developer roles in one of the UK’s top tech hubs. Whether you’re a seasoned Kotlin engineer or just starting out, our curated London-based Kotlin job listings connect you with leading companies seeking your skills. Start your Kotlin career in London today with Haystack – your go-to IT job board for Kotlin opportunities.
Senior Software Engineer
LANCESOFT LTD
London
Hybrid
Senior
Private salary
RECENTLY POSTED
  • Location:Brick Lane, London
  • Days in the Office:2 days per week
  • Job Title:Senior Engineer
  • Length of Contract:6 months, with potential extension

Key Skills:

  • Work embedded in a cross-functional team with software developers, technical product owners and testers all working together towards common goals to develop JVM applications using Test Driven Development and Pair Programming
  • Drive the design and implementation of our systems, knowing the context and why we are implementing what we are implementing, whilst always looking to improve our systems and ways of working
  • Mentor and coach other engineers
  • A willingness to pair program

Must-Haves:

  • Strong verbal communication and collaboration skills
  • In-depth knowledge and hands-on experience in a cross-functional, agile development team
  • Enthusiasm for code development and education in this area

Nice-to-Haves:

  • Experience in pair programming
  • Proficiency in idiomatic Kotlin for application development

Experience:

  • Extensive knowledge of Java programming language (5 years+)
  • 5+ years practical experience in test driven development

AI Integration:

  • We have an AI special interest group and are adopting AI based on individual context
iOS Engineer
Synergetic
London
Hybrid
Mid
Private salary
RECENTLY POSTED

iOS Engineer- Financial Services

Location: London (Hybrid 2-3 days onsite)

Type: Contract Term:

Initial: 3 months

Rate: Neg

Status: Outside IR35

About the Role We’re seeking an iOS Engineer to join a leading financial services institution undergoing a large scale digital transformation. You’ll be part of a cross functional mobile engineering team responsible for delivering secure and mobile applications.

Key Responsibilities

  • Develop, maintain, and enhance native iOS applications in Swift following best practices and clean architecture principles.
  • Collaborate with design and product teams to translate business requirements into technical solutions.
  • Integrate with RESTful APIs and internal financial systems securely and efficiently
  • Contribute to the continuous improvement of the mobile development life cycle and internal coding standards.

Essential:

  • Strong experience in iOS development using Swift Solid understanding of mobile app architecture
  • Proven experience working within banking, fintech or insurance.

Desirable:

  • Exposure to Kotlin Knowledge of CI/CD tools eg Jenkins
Android Engineer
Langham Recruitment
London
Fully remote
Mid - Senior
£90,000
RECENTLY POSTED

Android Engineer | Remote | Up to £90,000 | SaaS

We are partnering with an innovative technology company building intelligent mobility platforms used by major public transport operators across the world.

Their technology powers mobile experiences that combine location intelligence, behavioural insights and rewards systems to help millions of people move through cities more efficiently while increasing public transport adoption.

They are now looking for an Android Engineer to help evolve the mobile SDK that sits at the core of this platform. This is a role for engineers who enjoy working close to the platform layer and solving complex mobile engineering problems at scale.

The opportunity

You will work on a mobile SDK integrated into partner applications used by large transport operators and mobility providers.
The work involves challenges such as location tracking, background processing, sensor data, reliability across many Android devices and building robust APIs that other developers depend on.
You will collaborate closely with backend engineers and product teams while also working directly with partners to design solutions that integrate seamlessly into real world transport systems.
What you will be doing

Design and build advanced Android SDK features using Kotlin and Java
Solve complex problems around location, background services and mobile performance
Build reliable APIs and tools that other mobile teams integrate into their applications
Collaborate with engineers across mobile, backend and infrastructure teams
Improve architecture, testing practices and developer experience
Support partners integrating the SDK into large scale consumer applications
Continuously improve performance, security and reliability across the platform
What we are looking for

Strong experience building Android applications in Kotlin or Java
Experience working on complex mobile systems such as SDKs, frameworks or large scale applications
Experience with reactive programming such as RxJava
Deep understanding of asynchronous programming and multithreading
Strong knowledge of Android architecture and platform capabilities
Experience working with APIs and network based mobile services
Comfortable working in collaborative agile teams
Strong communication skills and fluent English
Nice to have

Experience working with location services sensors or Bluetooth technologies
Experience working with cross platform mobile environments
Exposure to cloud services or backend development
Interest in on device intelligence or machine learning
Salary and Benefits

Salary up to £90,000
Remote working
Flexible working hours

Senior Software Engineer Full Stack TypeScript
client server
London
Hybrid
Senior
£95,000
RECENTLY POSTED

Senior Software Engineer / Full Stack Developer (TypeScript Node React AWS) London / WFH to £95k

Are you a full stack technologist?

You could be progressing your career in a hands-on Senior Software Engineer role at a well established consumer facing financial services company that help people to manage debt, as they go through a technical transformation and scale-up following recent investment.

What’s in it for you:

Salary to £95k

Bonus

25 days holiday

Pension

Employee Assistance Programme

Onsite gym and well-being champions

X2 volunteering days per year

Opportunity to make an impact as part of new team in a role you can shape

Your role:

As a Senior Software Engineer you will design and develop customer facing applications, working across the full stack with a leaning towards TypeScript, Node and AWS on the backend but also with exposure to React on the front end, ensuring high standards of quality, security, reliability and operability across the stack. You’ll also have exposure to mobile app development using React Native.

Location / WFH:

You’ll be based in fantastic new offices in London that offer a wide range of facilities including wellness rooms and onsite gym for three days a week with flexibility to work from home twice a week.

About you:

You have advanced full stack development skills including TypeScript backends, microservices, APIs, React and also ideally React Native or Kotlin for mobile development

You have a good understanding of distributed systems, RDBMS (Oracle) and data modelling trade-offs

You have a good understanding of cloud native architecture and modern engineering practices such as CI/CD, Test Automation, monitoring and observability

You have an interest in AI and agentic systems, ideally having used in a commercial setting

You’re collaborative and pragmatic, comfortable working closely with Product Managers to explain technical aspects and trade-offs to shape delivery plans that balance speed, quality and risk

Apply now to find out more about this Senior Software Engineer / Full Stack Developer (TypeScript Node React AWS) opportunity.

TPBN1_UKTJ

Senior Android Developer - London
Adecco
London
Hybrid
Senior
£65,000 - £90,000
RECENTLY POSTED

Senior Android Developer
London (Hybrid - 2 days per week in the office)
Salary: £65,000 - £90,000 DOE

The Role

We’re currently looking for a Senior Android Developer to join a growing Mobile team. In this role, you’ll help develop and enhance a suite of high-traffic consumer apps used by millions.

You’ll work within cross-functional squads alongside product managers, designers, and engineers, contributing throughout the entire software development life cycle, from planning and design through to release and optimisation.

About the Company

Our client is driven by a clear mission: helping millions of people across the UK save money when it matters most. Through a range of well-established consumer platforms, their products support more than 20 million visitors each month, providing tools and insights that make a real difference to everyday households.

Why Join?

  • A supportive, inclusive workplace that encourages open thinking and collaboration
  • High-performing teams dedicated to delivering outstanding digital experiences
  • A culture that values diverse perspectives and ensures everyone feels heard

Key Responsibilities

  • Take ownership of delivering new features and contribute to technical direction
  • Work closely with product and design teams to create high-quality user experiences
  • Develop clean, scalable Kotlin code using Jetpack Compose
  • Promote engineering best practices including TDD, CI/CD, and automated testing
  • Provide guidance and mentorship to other developers in the team

About You

  • Strong experience developing Android applications using Kotlin and Jetpack Compose
  • Good understanding of mobile architecture, design patterns, and scalable app design
  • Comfortable working in Agile development environments with fast release cycles
  • Experience using AI-powered development tools to improve productivity and quality
  • A collaborative team player who enjoys sharing knowledge and continuously improving

Benefits

  • 27 days annual leave, increasing to 30 with service, plus bank holidays
  • Performance-related bonus scheme
  • Pension scheme with up to 6% employer contribution
  • Enhanced shared parental leave - up to 6 months fully paid for both parents
  • Work-from-anywhere scheme - up to 2 weeks per year
  • Access to mental health support platforms and financial wellbeing coaching

If you’re passionate about building high-impact mobile applications and want to be part of a collaborative, forward-thinking engineering culture, we’d love to hear from you.

Accessibility & Inclusion
Adecco is a Disability Confident employer. We are committed to ensuring our recruitment process is inclusive and accessible to all candidates. If you require any reasonable adjustments during the application or interview process, please let us know and we’ll be happy to support you.

Senior Android Developer
Adecco
London
Hybrid
Senior
£85,000

Location: Soho, London (Hybrid)
Salary: Up to £85,000 DoE
Permanent role

Ready to build Android apps used by millions? Want to work in a modern engineering culture that values clean code, collaboration, experimentation, and real autonomy?

If you enjoy solving meaningful problems, shipping high-quality mobile experiences, and working alongside people who genuinely care about craft and culture - you’ll love it here.

Why this role stands out

  • A team with personality - open-minded, diverse, inclusive, and genuinely enjoyable to work with.
  • A product environment where engineers, designers, and product managers collaborate as equals.
  • A culture where every voice matters and ideas flow freely, no matter your job title.
  • A chance to work on high-traffic consumer apps that make a real difference in people’s everyday lives.

The role

My client is looking for a Senior Android Developer to join our Mobile Collective, helping shape and evolve apps used across millions of UK households. You’ll work in full-stack, multi-disciplinary squads that take ownership end-to-end - design, build, deploy, observe, iterate.

They are an AI-enabled engineering organisation, using tools like GitHub Copilot and ChatGPT to accelerate delivery and raise code quality. If you’re excited about blending great engineering with smart AI tooling, this is a place to thrive.

What you’ll be doing

  • Leading feature delivery and contributing to technical strategy.
  • Collaborating closely with designers and product managers to ship beautiful, intuitive Android experiences.
  • Writing clean, maintainable Kotlin using Jetpack Compose as a first-class citizen.
  • Championing engineering best practice - pairing, mobbing, TDD, continuous delivery.
  • Designing secure, scalable solutions with performance in mind.
  • Debugging and optimising apps used at serious scale.
  • Staying curious, experimenting, and bringing modern Android thinking into the team.
  • Mentoring and supporting fellow engineers to level up together.

What we’re looking for

  • Strong experience building Android apps with Kotlin and Jetpack Compose.
  • Excellent understanding of modern app architecture and design patterns.
  • Passion for agile delivery and releasing value early and often.
  • Experience with Espresso for testing and Git for version control.
  • Comfortable using AI coding assistants to accelerate development.
  • A collaborative mindset and a desire to constantly learn and improve.

What you’ll get

  • Hybrid working - 2 days in the office, the rest wherever you work best.
  • Dedicated learning time, LinkedIn Learning licence, and regular conference opportunities.
  • Hack days, engineering communities, socials, and an annual Product & Tech meetup.
  • Clear progression framework and opportunities to explore other teams or tech areas.

Adecco is a disability-confident employer. It is important to us that we run an inclusive and accessible recruitment process to support candidates of all backgrounds and all abilities to apply. Adecco is committed to building a supportive environment for you to explore the next steps in your career. If you require reasonable adjustments at any stage, please let us know and we will be happy to support you.

Lead Mobile Developer
R3vamp Limited
London
Hybrid
Senior
£100,000 - £120,000

Lead Mobile Developer (Reactive Native) Circa £110,000 per annum London (Hybrid) Permanent Your New Role Our client are a global consultancy providing services in Digital Transformation, Digital Portfolio Management and Product/Service Development. Working within a nationally recognised client, you will drive the evolving library of a hybrid mobile applications (iOS and Android), which will serve millions of customers. In this role specifically, as a React Native Engineering Lead, you will own the technical delivery and strategy for React Native across iOS and Android. Shaping when hybrid approaches are appropriate and when Native remains essential. Collaborating with iOS and Android architects to align on the cross-platform architectural decisions and resolving any architectural constraints. Ensuring Your Success You will be an experience Mobile developer, with an extensive background in delivering React Native applications at scale. Excellent JavaScript/TypeScript skills are essential, with expert knowledge is React Architecture. You will have worked previously with Swift and Kotlin, to design, review and guide native integrations. Deep understanding of mobile performance, lifecycle management and platform constraints within multi-team, complex environments is highly desirable. In Return Other than a strong, competitive basic salary, the organisation offers additional benefits, to be discussed on briefing call.

Technical Architect
Experis
London
Fully remote
Senior - Leader
£500/day - £550/day

Job Title: Technical Architect

Max rate: 550p/d via Umbrella

Clearance required: BPSS + SC

Location: Remote Worker

Job Description:

Technically Lead the architectural modernisation of a large-scale, established data platform (DWX) within public sector client. This role requires experience of brownfield environments, strong hands-on technical capability, and the ability to reshape existing architectures to align with business and Data & Analytic (D&A) standards while maintaining uninterrupted service delivery.

You will be responsible for re-architecting data flows, modernising infrastructure, managing large-scale schema evolution, enabling cross-cloud connectivity, and providing senior guidance to technical teams and stakeholders.

Skills & Experience Required

Essential

  • Proven experience as a senior technical architect in complex brownfield environments.
  • Strong data platform architecture experience: ingestion patterns, schema evolution, ETL/ELT, microservices data integration.
  • Multi-cloud integration expertise (Azure + AWS) including secure data transfer patterns.
  • Deep understanding of government, public sector, or regulated environments.
  • Strong experience of technical authority, security governance and SRE handover
  • Experience maintaining critical services while modernising underlying platforms.
  • Strong infrastructure, security, and network architecture capability (Zscaler, VPC patterns, VPN, identity).
  • Ability to navigate and implement organisational standards.
  • Hands-on experience re-architecting or migrating technology stacks to standardised platforms.
  • Exceptional communication & leadership: able to drive clarity and decision-making in ambiguous contexts.
  • Strong experience of technical documentation on Confluence/SharePoint

Desirable

  • Experience with event-driven architectures and microservice-based data contracts.
  • Knowledge of Kotlin and migration pathways to standard languages (Java, Python, etc.).
  • Understanding of Power BI, CoPilot for Power BI, or GenAI (helpful but not core).
  • Relevant AWS and Azure certifications.
Spotlight
Software Engineer (contract)
Opencast
Multiple locations
Hybrid
Mid
£350/day - £450/day
+4

Ready to work somewhere that cares more about how you build software than how fast you can ship it? At Opencast, we don’t measure developers by the number of tickets you complete. We care about engineering craft, clean design and thoughtful problem-solving. Opencast consultants deliver in complex environments, pairing often and working with others who take pride in doing things properly: TDD, emerging design, refactoring and leaving code better than they found it. We build software we are proud of, and our clients trust us not just to code but to think, challenge and guide. If you value simple and robust solutions and want a role where your judgment matters as much as your keyboard, you will fit right in. The role We’re looking for Contractors in Software Development (consultant level) to help our major clients transform. Software developers at Opencast care about building products right and combine their own experience and approach with our company values. They are tech agnostic, have expertise in agile methodologies, extreme programming practices and use industry-leading programming languages to deliver agile transformation. Our approach to software development is collaborative, focused on keeping things simple, and we use test driven development and pair programming as best practice. Working with clients and key stakeholders is a crucial part of a consultancy role. Our developers are inclusive team players that listen, collaborate, can positively challenge and manage expectations when needed but most of all are always willing to teach and help others. Leaving a client with improved ways of working, working technology and a good experience from discovery through to live is the priority. Contractors at Opencast follow the same principles as permanent consultants. The roles are varied, technical, and never confined to any one provider or solution. Requirements Due to the nature of this role, applicants must either currently hold active Security Check (SC) Clearance or be eligible to obtain it. Eligibility typically requires UK citizenship and continuous residence in the UK for the past five years, with no single absence exceeding 28 consecutive days. As attendance at client sites is a routine part of the role’s working pattern and involves occasional travel, travel expenses are not covered. Experience in delivering digital services for the UK government is highly valuable for many of our projects. Therefore, familiarity with the GDS toolkit will be beneficial. Technical Skills - Expertise in Java and/or Scala is required - Experience with Javascript, Typescript, Kotlin, Python or Ruby is also valuable - Understanding of Object Oriented Programming - In depth knowledge of concepts and uses of testing - Knowledge or experience of delivering complex services to Government Digital Service (GDS) standards - Being comfortable with new technology, t-shaped and comfortable with ongoing learning and development is key to success - Experience with agile methodology A contractor in software development at Opencast is responsible for: - Delivering in the upkeep of their team’s backlog - Collaborating with the teams testing effort - Leading on the implementation of user stories - Embracing mobbing and pairing - Working with others in a collaborative, multi-disciplinary environment Salary Up to £450 per day (working inside IR35) Where you’ll work This role requires regular on-site attendance across our HQ, hub offices, client sites and home. Applicants must be able to commute to offices and client sites as part of their normal working arrangements, as travel is essential to fulfilling the responsibilities of the role. We include you We welcome candidates from all identities, attributes, ways of thinking and backgrounds to thrive in a career at Opencast. Our aim is for the diversity of our people to be reflected in the solutions we deliver, to help create a fairer society for all. Interview Interviews will be conducted via Microsoft Teams. We’re happy to make adjustments to support your needs. Want to know more? Visit our website for more details.

Spotlight
Senior Software Engineer
Opencast
Multiple locations
Hybrid
Senior - Leader
£59,001 - £72,000

Ready to work somewhere that cares more about how you build software than how fast you can ship it? At Opencast, we don’t measure developers by the number of tickets you complete. We care about engineering craft, clean design and thoughtful problem-solving. Opencast consultants deliver in complex environments, pairing often and working with others who take pride in doing things properly: TDD, emerging design, refactoring and leaving code better than they found it. We build software we are proud of, and our clients trust us not just to code but to think, challenge and guide. If you value simple and robust solutions and want a role where your judgment matters as much as your keyboard, you will fit right in. The role Software developers at Opencast care about building products right and combine their own experience and approach with our company values. They are tech agnostic, have expertise in agile methodologies, extreme programming practices and use industry-leading programming languages to deliver agile transformation. Our approach to software development is collaborative, focused on keeping things simple, and we use test driven development and pair programming as best practice. Working with clients and key stakeholders is a crucial part of a consultancy role. Our developers are inclusive team players that listen, collaborate, can positively challenge and manage expectations when needed but most of all are always willing to teach and help others. Leaving a client with improved ways of working, working technology and a good experience from discovery through to live is the priority. The role is varied, technical, never confined to any one provider or solution and there are always opportunities for learning and development. Requirements Due to the nature of this role, applicants must either currently hold active Security Check (SC) Clearance or be eligible to obtain it. Eligibility typically requires UK citizenship and continuous residence in the UK for the past five years, with no single absence exceeding 28 consecutive days. Experience in delivering digital services for the UK government is highly valuable for many of our projects. Therefore, familiarity with the GDS toolkit will be beneficial. Technical Skills - Expertise in Java or Scala is required - Experience in other languages such as Kotlin, Ruby or Javascript is also valuable - Deep understanding of programming paradigm, code design, testing, accessibility, performance and security - Proven ability to apply different testing tools and methods in practice - Knowledge or experience of delivering complex services to Government Digital Service (GDS) standards - Being comfortable with new technology, t-shaped and comfortable with ongoing learning and development is key to success. - Experience with agile methodology A senior consultant in software development at Opencast is responsible for: - Driving the elaboration of their team’s backlog - Setting testing strategies to match industry standards - Being a technical expert in their team (or acting as the team lead) - Leading the technical representation in a project discovery - Mentoring and coaching others to help them achieve their full potential - Demonstrating leadership within Opencast communities of practice Salary £59,001 - £72,000 What we offer A competitive package including a 7% employer pension contribution, share options and a discretionary bonus. You’ll also benefit from flexible working hours (aligned to client commitments), 25 days’ holiday, and access to 3 annual “life happens” days to support unexpected situations. We also offer wellbeing support, ongoing professional development, volunteering opportunities and the chance to be part of a genuinely supportive team. Where you’ll work This role requires regular on-site attendance across our HQ, hub offices, client sites and home. Applicants must be able to commute to offices and client sites as part of their normal working arrangements, as travel is essential to fulfilling the responsibilities of the role. We include you We welcome candidates from all identities, attributes, ways of thinking and backgrounds to thrive in a career at Opencast. Our aim is for the diversity of our people to be reflected in the solutions we deliver, to help create a fairer society for all. Interview Interviews will be conducted via Microsoft Teams. We’re happy to make adjustments to support your needs. Want to know more? Visit our website for more details.

Spotlight
Software Engineer
Opencast
Multiple locations
Hybrid
Mid
£47,000 - £55,000

Ready to work somewhere that cares more about how you build software than how fast you can ship it? At Opencast, we don’t measure developers by the number of tickets you complete. We care about engineering craft, clean design and thoughtful problem-solving. Opencast consultants deliver in complex environments, pairing often and working with others who take pride in doing things properly: TDD, emerging design, refactoring and leaving code better than they found it. We build software we are proud of, and our clients trust us not just to code but to think, challenge and guide. If you value simple and robust solutions and want a role where your judgment matters as much as your keyboard, you will fit right in. The role Software developers at Opencast care about building products right and combine their own experience and approach with our company values. They are tech agnostic, have expertise in agile methodologies, eXtreme programming practices and use industry-leading programming languages to deliver agile transformation. Our approach to software development is collaborative, focused on keeping things simple, and we use test driven development and pair programming as best practice. Working with clients and key stakeholders is a crucial part of a consultancy role. Our developers are inclusive team players that listen, collaborate, can positively challenge and manage expectations when needed but most of all are always willing to teach and help others. Leaving a client with improved ways of working, working technology and a good experience from discovery through to live is the priority. The role is varied, technical, never confined to any one provider or solution and there are always opportunities for learning and development. Requirements Due to the nature of this role, applicants must either currently hold active Security Check (SC) Clearance or be eligible to obtain it. Eligibility typically requires UK citizenship and continuous residence in the UK for the past five years, with no single absence exceeding 28 consecutive days. Experience in delivering digital services for the UK government is highly valuable for many of our projects. Therefore, familiarity with the GDS toolkit will be beneficial. Technical Skills - Expertise in Java or Scala is required - Experience in other languages such as Kotlin, Ruby or Javascript is also valuable - Understanding of Object Oriented Programming - In depth knowledge of concepts and uses of testing - Knowledge or experience of delivering complex services to Government Digital Service (GDS) standards - Being comfortable with new technology, t-shaped and comfortable with ongoing learning and development is key to success - Experience with agile methodology A consultant in software development at Opencast is responsible for: - Delivering in the upkeep of their team’s backlog - Collaborating with the teams testing effort - Leading on the implementation of user stories - Embracing mobbing and pairing - Working with others in a collaborative, multi-disciplinary environment - Contributing to Opencast’s communities of practice Salary £47,000 - £55,000 What we offer A competitive package including a 7% employer pension contribution, share options and a discretionary bonus. You’ll also benefit from flexible working hours (aligned to client commitments), 25 days’ holiday, and access to 3 annual “life happens” days to support unexpected situations. We also offer wellbeing support, ongoing professional development, volunteering opportunities and the chance to be part of a genuinely supportive team. Where you’ll work This role requires regular on-site attendance across our HQ, hub offices, client sites and home. Applicants must be able to commute to offices and client sites as part of their normal working arrangements, as travel is essential to fulfilling the responsibilities of the role. We include you We welcome candidates from all identities, attributes, ways of thinking and backgrounds to thrive in a career at Opencast. Our aim is for the diversity of our people to be reflected in the solutions we deliver, to help create a fairer society for all. Interview Interviews will be conducted via Microsoft Teams. We’re happy to make adjustments to support your needs. Want to know more? Visit our website for more details.

Spotlight
Senior Software Engineer (contract)
Opencast
Multiple locations
Hybrid
Senior
£450/day - £600/day
+4

Ready to work somewhere that cares more about how you build software than how fast you can ship it? At Opencast, we don’t measure developers by the number of tickets you complete. We care about engineering craft, clean design and thoughtful problem-solving. Opencast consultants deliver in complex environments, pairing often and working with others who take pride in doing things properly: TDD, emerging design, refactoring and leaving code better than they found it. We build software we are proud of, and our clients trust us not just to code but to think, challenge and guide. If you value simple and robust solutions and want a role where your judgment matters as much as your keyboard, you will fit right in. The role We’re looking for Contractors in Software Development (Senior level or Technical Lead) to help our major clients transform. Software developers at Opencast care about building products right and combine their own experience and approach with our company values. They are tech agnostic, have expertise in agile methodologies, extreme programming practices and use industry-leading programming languages to deliver agile transformation. Our approach to software development is collaborative, focused on keeping things simple, and we use test driven development and pair programming as best practice. Working with clients and key stakeholders is a crucial part of a consultancy role. Our developers are inclusive team players that listen, collaborate, can positively challenge and manage expectations when needed but most of all are always willing to teach and help others. Leaving a client with improved ways of working, working technology and a good experience from discovery through to live is the priority. Contractors at Opencast follow the same principles as permanent consultants. The roles are varied, technical, and never confined to any one provider or solution. Requirements Due to the nature of this role, applicants must either currently hold active Security Check (SC) Clearance or be eligible to obtain it. Eligibility typically requires UK citizenship and continuous residence in the UK for the past five years, with no single absence exceeding 28 consecutive days. As attendance at client sites is a routine part of the role’s working pattern and involves occasional travel, travel expenses are not covered. Experience in delivering digital services for the UK government is highly valuable for many of our projects. Therefore, familiarity with the GDS toolkit will be beneficial. Technical Skills - Expertise in Java and/or Scala is required - Experience in other languages such as Javascript, Typescript, Kotlin, Python or Ruby is also valuable - Experience in a technical leadership role - Deep understanding of programming paradigm, code design, testing, accessibility, performance and security - Proven ability to apply different testing tools and methods in practice - Knowledge or experience of delivering complex services to Government Digital Service (GDS) standards - Being comfortable with new technology, t-shaped and comfortable with ongoing learning and development is key to success - Experience with agile methodology A senior level contractor in software development at Opencast is responsible for: - Driving the elaboration of their team’s backlog - Setting testing strategies to match industry standards - Being a technical expert in their team (or acting as the team lead) - Leading the technical representation in a project discovery - Acting as a technical lead in the team, enabling them to achieve their full potential Salary £450 - £600 per day (working inside IR35) Where you’ll work This role requires regular on-site attendance across our HQ, hub offices, client sites and home. Applicants must be able to commute to offices and client sites as part of their normal working arrangements, as travel is essential to fulfilling the responsibilities of the role. We include you We welcome candidates from all identities, attributes, ways of thinking and backgrounds to thrive in a career at Opencast. Our aim is for the diversity of our people to be reflected in the solutions we deliver, to help create a fairer society for all. Interview Interviews will be conducted via Microsoft Teams. We’re happy to make adjustments to support your needs. Want to know more? Visit our website for more details.

Senior Engineer
Experis
London
Hybrid
Senior
Private salary
+3

Job title: Senior Engineer - Identity
Contract: 6 months (extension possible)
Location: London (Hybrid - 1 day onsite, 4 days remote)

Overview
We are seeking a Senior Engineer to support and deliver across key Identity-related workstreams. This role requires a strong backend engineering foundation combined with hands-on delivery capability across distributed systems. The successful candidate will operate across multiple software components, contributing to both new delivery and continuous improvement initiatives.

You will be expected to take ownership, proactively drive progress, and work within a structured delivery framework while maintaining a clear focus on product impact and customer outcomes.

Core Technical Skills
Skills

  • Java and/or Kotlin
  • Micronaut or Spring Boot
  • Experience building and supporting distributed systems
  • React / Next.js
  • AWS and/or Azure experience

Experience

  • Identity & Access Management standards (OAuth 2.0, OIDC, SAML)
  • Microsoft Azure services (application deployment, integration, identity management)
  • Observability and monitoring practices (Dynatrace experience advantageous)

Key Responsibilities

  • Contribute to delivery across Identity-focused engineering streams
  • Work across multiple software components with a hands-on, problem-solving mindset
  • Improve and remediate existing systems where required
  • Operate effectively within a structured engineering delivery process
  • Take ownership of deliverables and proactively drive work forward
  • Align technical solutions with product objectives and customer impact
Page 1 of 1
Frequently asked questions
In London, you can find a variety of Kotlin jobs including Android developer roles, backend developer positions, full-stack developer opportunities, and software engineer roles specializing in Kotlin-based projects.
Many Kotlin job listings in London also require experience with related technologies such as Android SDK, Java, Spring Boot, RESTful APIs, and cloud platforms like AWS or Google Cloud.
You can find Kotlin job listings specifically for London by using the search filters on Haystack’s job board. Simply select 'Kotlin' as the keyword and 'London' as the location to browse relevant opportunities.
Yes, many employers offer remote or hybrid Kotlin developer positions for professionals based in London. You can filter your search to include remote jobs on Haystack.
Common qualifications include a degree in Computer Science or related fields, strong Kotlin programming skills, experience with Android development or backend systems, familiarity with software development best practices, and good problem-solving abilities.