Principal Software Engineer

Location: Portsmouth with a hybrid working model

Hours: Full time

Salary: From £65,000 but negotiable, depending on experience. The role comes with a competitive benefits package including pension (7% company contribution), 25 days holiday and life insurance.

We offer a combination of mentoring and internal and external training opportunities, with specialist sector organisations and inhouse courses. You will have exposure to subject matter experts and additional online learning packages.

The Role:

Sirius Digital are a rapidly growing software and data science consultancy firm, renowned for our reputation and our keen ability to understand and meet customer requirements effectively. Our team is dedicated to delivering high-quality, end-to-end software and data science services. This role offers the opportunity to work with these teams to operate across multiple sectors, including defence, energy, transport and health, and contribute to the development of cutting-edge solutions.

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

As a Principal 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.

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.

• At least 15 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.
• Demonstratable skills in stakeholder management including influencing, negotiating and conflict management.
• Demonstratable experience and capability in writing proposals and coordinating bid management activity.
• Experience of 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)
• 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.
• 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.
• We’d love you to bring a strong STEM / computing background.
• Proficient in MS Office, especially Excel, PowerPoint, Word.

What we offer :

We offer a combination of mentoring and internal and external training opportunities, with specialist sector organisations and inhouse courses. You will have exposure to subject matter experts and additional online learning packages.

The role comes with a competitive benefits package including:

• electric vehicle scheme
• pension (7% company contribution)
• life insurance

Other Requirements:

• Candidates must have an existing right to live and work in the UK.
• Candidates must be willing to undergo an internal baseline personnel security standard check prior to starting their employment with the company.
• Candidates must be willing and eligible to complete a United Kingdom Security Vetting (UKSV) security clearance application to the Security Check (SC) level upon starting their employment with the company. To gain SC Clearance you will normally need at least 5 years’ UK residency.

To Apply

To apply please send a covering email and CV to

CVs are reviewed upon submission and initial phone for face-to-face interviews are likely to begin within two weeks. Feedback will be given on all interview candidates regardless of success.

Interested in this role?

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