Software Engineer

Salary:Competitive, negotiable based on experience, plus benefits including a 7% pension contribution, 25 days holiday, and life insurance

Location:Portsmouth, hybrid working

Sirius Digital is a trusted provider of expertise in Software Engineering, Data Science, and AI, supporting clients in the defence, nuclear, space, and energy sectors. We specialise in software modelling and simulation, robotics and autonomous systems, as well as data science and engineering, delivering technical consultancy and innovative solutions.

We are seeking a Software Engineer who combines strong technical skills with problem-solving ability and effective communication. You will work independently or as part of small teams, helping Sirius Digital grow while advancing your own expertise. We offer a competitive benefits package and clear opportunities for rapid career progression.

Key Responsibilities:

• Deliver technical consultancy projects to a high standard
• Develop and implement software solutions across areas such as wargaming, simulation, autonomous systems, digital twins, and synthetic environments
• Build and sustain strong client relationships
• Apply mathematical and computational techniques to solve real-world problems, developing innovative approaches as needed

What Were Looking For:

• Experience designing and delivering performant software applications, ideally within a technical consultancy environment
• Knowledge of software modelling and simulation techniques
• Ability to analyse requirements and define technical specifications
• Experience in one or more of the following: videogame engine technology (e.g., Unreal Engine, Godot), entity or event-based simulation, robotics, and autonomous systems
• Proficiency in C/C++, familiarity with Python, C#, Zig.
• Willingness to learn new technologies and programming languages
• Ability to apply mathematical or statistical methods to scientific or applied challenges
• Confidence working with large codebases and understanding hardware/performance constraints
• Strong interpersonal skills for client and stakeholder engagement
• Experience preparing technical reports and presenting to customers
• Willingness to travel within the UK and work on client sites as required

Desirable:

• Background working with Defence Digital, DE&S, Dstl, Frontline Commands, or the UK Defence industry
• Degree in a STEM or computing discipline, or equivalent experience
• Proficiency with MS Office (Excel, PowerPoint, Word)

What We Offer:

• Mentoring, internal and external training, and access to sector specialists and online learning
• Comprehensive benefits including a 7% pension contribution, private healthcare, life assurance, additional holiday purchase options, and an electric vehicle scheme

Other Requirements:

Candidates must have an existing right to live and work in the UK.

Candidates will need to undergo an internal BPSS check prior to gaining site access.

Candidates will also need to either be willing and eligible or to undergo a Security Clearance check (SC level) or hold a current SC clearance upon starting their employment with the company. To gain SC clearance you will normally need at least 5 years UK residency.

C++, OpenGL, Virtual Reality, Augmented Reality, Extended Reality Tiro Partners have been assisting a client who are working in the spatial computing and real-time rendering space to groww their technical function due to continued success. We have a brand new opening for a competent C++ engineer to join the team. The ideal candidate will have hands-on experience in real-time graphics programming using OpenGL or Vulkan, along with a solid understanding of performance optimisation on embedded or purpose-built hardware. You will bring proven debugging abilities across complex real-time systems, experience contributing to large code bases, and a track record of shipping production software, including involvement in testing, release processes, and field support. The role requires strong communication skills, a collaborative mindset, and the ability to engage directly with end users to gather feedback and validate solutions. Familiarity with spatial computing concepts such as 3D coordinate systems, transformations, and projection is essential. Experience with AR/VR development, XR frameworks (such as OpenXR or OpenVR), and exposure to Unity, Unreal Engine, or custom rendering pipelines would be highly advantageous. Please apply for an immediate response Salary - 60-80K + Equity + Benefits C++, OpenGL, Virtual Reality, Augmented Reality, Extended Reality

Software Engineer - Defence / Search & Rescue - C++ or C# - Up to 55K - Lincolnshire We are looking for a highly motivated Software Engineer to join an award winning Defence and Search & Rescue organisation with offices just outside of Lincoln. The technical team consists of 12 and is comprised of Software Engineer, Software Testers, Product owners and Support. They are a big believer in sharing thoughts and encouraging and supporting innovation and creativity. The Software Engineer will also be given the chance to be involved in all aspects of the process, from conception through to completion and launch. The environment is relaxed yet professional and will provide the opportunity to design and develop code for technically complex Defence solutions. Software Engineer Tech Stack: \* C++ or C# \* DevOps, GitHub \* GitHub \* Simulation \* Unreal Engine or Unity \* Graphical Languages - OpenGL, WebGL, DirectX \* Software development lifecycle and methodologies We are not expecting the Software Engineer to be an expert in all the technologies above, just a strong basis knowledge and passion to learn more! You will be an enthusiastic Software Engineer, a good communicator and have a natural desire to create amazing code. The successful Software Engineer should have strong problem solving abilities, organisational skills and the ability to work as part of a team. Due to the nature of the position it's required for the Software Engineer to be a UK National for government security vetting. This includes a minimum of 5 years consecutive UK residency. We are interviewing currently so apply now for immediate consideration for the Software Engineer position or contact George Harvey at ITSS Recruitment for further information. TPBN1\_UKTJ

Salary: Negotiableplus benefits, pension (7% contribution), 25 days holiday & life insurance

We are looking for principal software engineers with diverse experience.

We are a small but rapidly growing consultancy, owned highly experienced and recognised practitioners in UK defence consultancy. We are looking for candidates with a mix of technical expertise and interpersonal skills, able to work independently and in small teams.

The Role:

As a Principal Software Engineer, you will play a major role in leading and developing software engineering in the Software Modelling and Simulation, autonomy and geospatial fields, along with providing key advice around innovation and new techniques to stakeholders.You will be designing solutions for complex challenges that will meet and exceed user requirements.

Responsibilities will include:

• Take responsibility for the leadership and delivery of whole, or significant sub-components, of technical consulting projects and products.
• Designing, developing and delivering software solutions using a large range of techniques, including Wargames, Modelling and Simulation, Robotic and Autonomous systems, Digital Twins and Synthetic Environments.
• Applying mathematical and computational methods to tackle real world problems, applying tools and techniques, and developing novel approaches where required.
• Building new relationships and maintaining current customer relationships.

Expertise Required:

• Principal Software Engineer: At least 10 years of experience, including designing and delivering software applications and leading teams.

About You:

We are looking for candidates who can help the company grow and can offer exciting opportunities for those with the drive to develop their own skills and those of the company. We offer competitive salaries and packages, and the opportunity for rapid advancement for the right candidates.

The successful candidate must be able to demonstrate the following attributes:

Essential

• At least 10 years experience in designing and implementing performant software applications.
• Apply mathematical principles or statistical approaches to solve problems in scientific or applied fields.
• The ideal candidate will be educated to degree level or have equivalent relevant experience.
• Proficient in C/C++ native development.
• Demonstratable skills in stakeholder management including influencing, negotiating and conflict management.
• Demonstratable experience and capability in writing proposals and coordinating bid management activity.
• Experience in line management and enabling people to perform.
• Extensive experience with a range of software modelling and simulation techniques.
• Experience in using cases and project data context to determine specifications and requirements.
• Experience in one or more of the following technical disciplines:
• Videogame engine technology (e.g. Unreal Engine, Godot)
• Agent, Entity and Event based Simulation
• Robotics and Autonomous Systems
• Understand varied codebases and be confident in making changes to large projects.
• Understand performance and hardware constraints.
• Building customer and stakeholder relationships.
• Authoring of technical reports
• Presenting to customers.
• Be willing to travel (on occasion as projects demand) and comfortable to work at client sites for periods.

Desirable:

• Experience working with Defence Digital, DE&S, Dstl, Frontline Commands or UK Defence industry.

Other Requirements:

• Candidates must have an existing right to live and work in the UK.
• Candidates will need to undergo an internal BPSS check prior to gaining site access.
• Candidates will also need to either hold a current SC clearance or be willing and eligible to undergo a Security Clearance check (SC level) upon starting their employment with the company. To gain SC clearance you will normally need at least 5 years UK residency.

Salary: Negotiableplus benefits, pension (7% contribution), 25 days holiday & life insurance

We are looking for senior software engineers with a range of levels of experience including designing and delivering software applications.

We are a small but rapidly growing consultancy, owned by four highly experienced and recognised practitioners in UK defence consultancy. We are looking for candidates with a mix of technical expertise and interpersonal skills, able to work independently or in small teams.

The Role:

As a Software Engineer, you will play a major role in developing code in the Software Modelling and Simulation, autonomy and geospatial fields, along with providing key advice around innovation and new techniques to stakeholders. You will be designing solutions for complex challenges that will meet and exceed user requirements.

Responsibilities will include:

• Designing, developing and delivering software solutions using a large range of techniques, including Wargames, Modelling and Simulation, Robotic and Autonomous systems, Digital Twins and Synthetic Environments.
• Applying mathematical and computational methods to tackle real world problems, applying tools and techniques, and developing novel approaches where required.
• Delivering technical consulting projects and products, with the opportunity to lead some of these
• Building new relationships and maintaining current customer relationships.

Expertise Required:

• Senior Software Engineer: At least 5 years experience, including designing and delivering software applications.

About You:

We are looking for candidates who can help the company grow and can offer exciting opportunities for those with the drive to develop their own skills and those of the company. We offer competitive salaries and packages, and the opportunity for rapid advancement for the right candidates.

The successful candidate must be able to demonstrate the following attributes:

Essential

• At least 5 years experience in designing and implementing performant software applications.
• Apply mathematical principles or statistical approaches to solve problems in scientific or applied fields.
• Proficient in C/C++ or C# and Python.
• Ability to understand and describe a range of software modelling and simulation techniques.
• Ability to analyse use cases and project data context to determine specifications and requirements.
• Experience in one or more of the following technical disciplines:
• Videogame engine technology (e.g. Unreal Engine, Godot)
• Entity or Event based Simulation
• Robotics and Autonomous Systems
• Understand varied codebases and be confident in making changes to large projects.
• Understand performance and hardware constraints.
• Building customer and stakeholder relationships.
• Supporting and leading authoring of technical reports and presenting to customers.
• Be willing to travel across UK and comfortable to work at client sites for periods.

Desirable:

• Experience working with Defence Digital, DE&S, Dstl, Frontline Commands or UK Defence industry.
• The ideal candidate will be educated to degree level or have equivalent relevant experience.
• Wed love you to bring a strong STEM / computing background.
• Proficient in MS Office, especially Excel, PowerPoint, Word.

Other Requirements:

• Candidates must have an existing right to live and work in the UK.
• Candidates will need to undergo an internal BPSS check prior to gaining site access.
• Candidates will also need to either hold a current SC clearance or be willing and eligible to undergo a Security Clearance check (SC level) upon starting their employment with the company. To gain SC clearance you will normally need at least 5 years UK residency.