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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