Software Engineer - Submarines

We have an exciting opportunity for a Software Engineer to help develop tools that support the design and manufacture of nuclear powerplants for the Royal Navy. You will build in-house web applications that help scientists and engineers work more efficiently and make better decisions. In this role, you will specify, design, test, and validate software components, and deliver high-quality code and documentation on time. You will break down designs, create tests, and ensure the software meets all requirements. Our backend uses Python with scientific libraries (NumPy, SciPy, Polars), and our frontend uses React. Experience with these is helpful but not required.

Responsibilities:

• Developing web applications for the upload, processing, and visualisation of complex manufacturing datasets.
• Aggregating data to aid product manufacture, helping to reduce risk, time and cost in our products.
• Modernising our processes and methods, acting as an ambassador for software and digital methods.
• Mentoring and upskilling junior colleagues, guiding process compliance, and supporting wellbeing.

Who We’re Looking For:

• Demonstrable long‑term experience of software development in a commercial environment, preferably in fields with a focus on compliance (Financial services, medical, engineering, etc).
• A numerate, degree‑level education (Computer Science, Mathematics, Physics, Engineering) or equivalent experience.
• Committed to developing high‑quality code that is interpretable, documented and tested, taking responsibility to steer governance and continuous improvement of these processes.
• Keen to work with a range of customers from operations and engineering to elicit requirements and translate them to traceable code, and to design and architect solutions for long‑term stability and maintainability.
• Delivery‑focused mindset, able to make decisions that balance complexity and shipping value, including at the tech stack level.
• Experience of automation in the context of software development and deployment lifecycle.
• Demonstrable leadership attributes without necessarily being a direct team leader.
• Interests in topics beyond typical web application development – especially statistics, optimisation, and mathematics (Desirable).
• Experience of working during change or transformation, building relationships within complex organisations and influencing outcomes (Desirable).

Please be aware that the priority will be given to employees identified as being at high risk. It is advised that you inform your current manager of your application for this role.

Additional Information:

• Grade: 7-10
• Closing date: 16/01/2026
• Job Category: Software Systems
• Seniority level: Mid‑Senior level
• Employment type: Full-time
• Job function: Engineering and Information Technology / Maritime Transportation
• Posting date: 10 Dec 2025; 00:12
• Posting end date: 16 Jan 2026

Security Clearance: To work for Rolls‑Royce Submarines, you need to hold a Security Check (SC) clearance without any caveats to that clearance. Rolls‑Royce will support the application for Security Clearance if you don’t currently already have this in place. Due to the nature of work the business conducts and the protection of certain assets, you must hold a UK nationality. Any dual nationals will require additional scrutiny and background checks prior to commencing work with RRSL.

Equal Opportunity Employer: We are an equal opportunities employer. We’re committed to developing a diverse workforce and an inclusive working environment. We believe that people from different backgrounds and cultures give us different perspectives. By building a culture of respect and appreciation, we give everyone who works here the opportunity to realise their full potential.