Principal Software Engineer

Location: Portsmouth with a hybrid working model.

Hours: Full time.

Salary: From £65,000 but negotiable, depending on experience.

The Role

Sirius Digital is a rapidly growing software and data science consultancy that delivers high‑quality end‑to‑end solutions across defence, energy, transport and health sectors.

As a Principal Software Engineer you will develop software for Software Modelling & Simulation, autonomy and geospatial fields, provide technical insight and lead projects.

Responsibilities

• Design, develop and deliver software solutions using a range of techniques including wargames, modelling and simulation, robotic and autonomous systems, digital twins and synthetic environments.
• Apply mathematical and computational methods to real‑world problems and develop novel approaches where required.
• Deliver technical consulting projects and products, with the opportunity to lead some of them.
• Build and maintain customer relationships.

Essential Qualifications

• At least 15 years of experience designing and implementing high‑performance software applications.
• Ability to apply mathematical principles or statistical approaches to solve problems in scientific or applied fields.
• Proficiency in C/C++ or C# and Python.
• Demonstrable stakeholder management skills, including influencing, negotiating and conflict management.
• Experience writing proposals and coordinating bid management activity.
• Line management experience and the ability to enable people to perform.
• Extensive experience with software modelling and simulation techniques.
• Ability to use case and project data context to determine specifications and requirements.
• Experience in one or more of the following disciplines: videogame engine technology (e.g. Unreal Engine, Godot); entity‑based simulation; robotics and autonomous systems.
• Understanding of varied codebases and confidence in making changes to large projects.
• Understanding of performance and hardware constraints.
• Experience building customer and stakeholder relationships.
• Ability to support and lead the authoring of technical reports and present them to customers.
• Willingness to travel across the UK and work at client sites for periods.

Desirable Qualifications

• Experience working with Defence Digital, DE&S, Dstl, Frontline Commands or the UK defence industry.
• Degree‑level education or equivalent relevant experience.
• A strong STEM or computing background.
• Proficiency in MS Office, especially Excel, PowerPoint and Word.

Benefits

• Electric vehicle scheme
• Pension (7% company contribution)
• Life insurance
• 25 days holiday
• Competitive salary

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 before starting.
• Candidates must be eligible to complete a United Kingdom Security Vetting (UKSV) security clearance application to the Security Check (SC) level upon starting; normally requires at least five years of UK residency.

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