Are you a pragmatic, innovative, and self-motivated problem solver with a passion for building scalable, high-performing software? We’re looking for a Senior Full Stack Engineer, with strong skills in Node and React, to join a high-performing product team working on a global, high-traffic eCommerce platform handling thousands of transactions daily.
You’ll play a key role in designing and developing end-to-end solutions, collaborating closely with both technical and business teams to deliver new features that drive growth and enhance the customer experience.
What You’ll Do
- Build and maintain robust, scalable applications across the full stack (Node/React/TypeScript)
- Collaborate in an agile team environment to deliver clean, maintainable, and testable code
- Influence architectural decisions and technology choices
- Optimise Front End and Back End performance to ensure fast, seamless user experiences
- Contribute to continuous improvement efforts, introducing new ideas and technologies
What You’ll Bring
- Proven experience as a Full Stack Engineer or similar role
- Expertise in React, JavaScript/TypeScript, HTML, CSS, and responsive design principles
- Strong understanding of Back End technologies and best practices
- Passion for writing clean, well-tested code
- Experience with cloud platforms (AWS, Azure, or GCP)
- Excellent communication skills and the ability to explain technical ideas clearly
- A mindset focused on scalability, maintainability, and continuous learning
- Must be proficient in Node and React
Nice to Have
- Degree in Computer Science or a related field
- Experience in eCommerce sectors
- Familiarity with CI/CD tools such as Jenkins or GitHub Actions
Why You’ll Love It Here
- Work on a product with global reach and real-world impact
- Have a voice in how things are built - your ideas matter
- Collaborative, forward-thinking engineering culture
- Flexible working environment with opportunities for growth
Location: London
Salary: £80k/per annum
My leading Digital client are looking for a talented and motivated individual to provide technical leadership in designing, developing and maintaining their digital initiatives and application development as they venture into offering more services for consumers across multiple digital channels.
You’ll ensure the current implementation of their digital solutions are in line with industry best practices and standards. Whilst also driving improvements in the design, processes & implementation to improve operational management, scalability, and extensibility.
This is a newly created role for a growing business. An amazing opportunity!
The following skills/experience is essential:
- Strong React Native development background
- Demonstrable experience delivering applications in both iOS and Android
- GraphQL and Restful APIs
- Solid understanding of the full mobile development life cycle
- Good communication skills
Salary: Up to £95,000 + bonus + package
Location: London (good work from home options available)
If you are interested in this React Native App Lead position and meet the above requirements please apply immediately.
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.
Senior Frontend Engineer Series A AI Startup $30M Funding Enterprise AI
Our client are building the next generation of enterprise AI - systems that learn continuously from real-world processes.
They’re a Series A company backed by $30M in funding and are growing their Product Engineering team to tackle one of the hardest problems in applied AI.
The Role
As a Frontend Product Engineer, you’ll build their core platform, enabling an intuitive & user-friendly experience all end clients. Your work will directly shape how users interact with the core product & the value they get from the product.
You’ll be comfortable working on end-to-end projects, from design through to deployment, being heavily user-centric and understanding user requirements via ongoing engagement with key clients.
You’ll be an expert in React, having experience of greenfield builds & a track-record of creating intuitive solutions that solve real-world engineering problems,
What We’re Looking For
- Exceptional React expertise
- Excellent understanding of UX and how it features in the end-to-end development of intuitive frontends (of which you will take full ownership)
- A strong product-oriented mindset
- Hands-on work with human-in-the-loop feedback, evaluation frameworks, or continuous learning pipelines.
- Comfort operating at the boundary between research and real-world impact.
- Experience in a start-up environment or an impactful role with a high degree of ownership within a big tech environment
Why Join
- Extremely competitive salary
- Meaningful equity
- Work alongside some of the best talent in applied AI
- A rare opportunity to shape how the next generation of AI systems learn and evolve
If you’re excited about building AI systems that don’t just run workflows but learn from the world, we’d love to hear from you.
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.
We’re looking for a Senior Software Engineer to join a growing team building smart, scalable tools used by professionals across a range of industries. You’ll work onsite in London, helping shape robust backend services and responsive user experiences using React and NextJS.
What You’ll Do
- Build and maintain scalable, secure applications, modern architectural patterns
- Write clean, test-driven code with a focus on performance and usability
- Collaborate across teams to deliver iterative improvements
- Lead on innovation and continuous delivery best practices
- Support and mentor others while staying hands-on with the tech
What We’re Looking For
- Proven experience working with React
- Strong understanding of microservices, CI/CD, and DevOps practices
- Confident writing performant frontend code
- Agile mindset with excellent communication skills
- Enthusiastic about solving problems and sharing knowledge
Nice to Have:
- Experience with Drupal 7
- Familiarity with serverless architectures, quality engineering, or modern frontend frameworks
INDLON
49904NB
Portfolio Payroll Ltd is acting as an Employment Agency in relation to this vacancy.
About You:
We’re looking for a UX Designer & Developer who is passionate about creating beautiful, intuitive user experiences. You’re not just a designer—you’re a problem solver who thrives on turning complex challenges into seamless solutions. Your skill set spans UX, UI, and front-end development, and you have a deep understanding of how design choices impact usability. You’ll be a leader in shaping the look and feel of our platform, guiding the team in best practices and setting the bar for exceptional design.
What We’re Looking For:
- Extensive experience in UX and UI, ideally within a B2B SAAS environment. Designing intuitive, simple solutions to complex problems.
- Experience in front-end web development and proven ability to create user-centric, visually appealing designs (ideally in a B2C product environment)
- Strong knowledge of TypeScript, React, CSS and HTML. Experience with the Material UI library is a bonus.
- Passion for clean, maintainable code and an eye for UX/UI excellence.
- Solid understanding of browser rendering in both desktop and mobile
- A collaborative mindset to guide the team in best practices and future direction.
- Excitement about reshaping the advertising automation and insight process with innovative solutions.
About Automated Creative:
- Automated Creative makes and optimises ad creative using live data and insight.
- Our platform helps performance marketers scale social, display and retail media campaigns.
- AC is the fastest way to launch, scale and learn what makes ad creative work.
- We are dedicated to providing real, actionable insight to our clients and agency partners. We need to build the platform which allows the most seamless access to these possible
Why Join Us?
- Impact: Your work will directly improve the experience for our new SAAS offering, saving valuable time and effort, creating an end to end solution from build to insight.
- Focus on technology: Work directly with our tech-oriented team who understand programmers, and know how to deliver quality software
- Growth: Shape your role, develop and test your skills, and steer the direction of our technology and product.
- Culture: We’re a small, collaborative team, which means quick decision making and greater autonomy.
About The Role:
As a UX/UI Developer you’ll:
- Solve real-world problems with creativity and advanced product knowledge.
- Turn solutions into intuitive, workable products that seem obvious once implemented and tested by agencies and blue chip clients across the industry.
- Lead design discussions, set best practices, and mentor the team on UX and UI.
- Collaborate across teams to deeply understand user needs and deliver revolutionary solutions.
- Be responsible for dramatically iterating our current processes and designs.
- Influence company-wide decisions and have a say in what we build and how we build it.
Haystack is working with a direct employer on this opportunity
Junior Full-Stack Software Engineer (React / TypeScript)
💰 £35k - £55k DOE
📍 Hybrid – London or Remote (UK)
We’re working with a high-growth SaaS startup that’s scaling fast and looking for a Junior Full-Stack Engineer to join their product team.
This is a chance to work in an environment where ideas move quickly, code ships daily, and your work directly impacts thousands of users. You’ll collaborate with experienced engineers, product designers, and founders who care deeply about great code, great culture, and building something that genuinely changes how people work.
What You’ll Do
- Build and maintain modern, responsive web applications using React + TypeScript.
- Work on Node.js microservices and contribute to scalable backend APIs.
- Collaborate with product and design teams to turn concepts into working features.
- Write clean, testable, and maintainable code across the full stack.
- Participate in code reviews, sprints, and product demos in a fast-paced, startup environment.
- Get hands-on exposure to AWS, Docker, GraphQL, and CI/CD pipelines.
What You’ll Bring
- 1+ year of experience (commercial or project-based) with React and TypeScript.
- Basic understanding of Node.js and MongoDB.
- Passion for building products end-to-end and learning modern frameworks.
- Curiosity, creativity, and a startup mindset — you enjoy solving real problems with real code.
- A collaborative, team-first attitude and eagerness to learn from senior engineers.
Why It’s a Great Move
🚀 Work directly with founders and engineers shaping the next big product in their industry.
🧠 Access to mentorship, code reviews, and a clear growth pathway.
🏡 Flexible hybrid working (office HQ in Newcastle, remote welcome).
📚 Personal development budget and the latest dev tools.
❤️ Culture built on trust, ownership, and speed — no bureaucracy, just great engineering.
If you’re a hands-on developer ready to learn fast, ship fast, and grow with a company that’s going places, we’d love to hear from you.
📩 Apply now and join one of the UK’s most exciting early-stage tech teams.