Software Engineer

THE OPPORTUNITY

We are seeking a SOFTWARE ENGINEER, you will be responsible for the design, development and integration of a Hardware‑in‑the‑Loop (HIL) simulator, as well as supporting technical exchanges with other space engineering disciplines. You will work closely with system engineering teams to ensure the successful development.

Key Responsibilities

• Analyse technical requirements and contribute to system and software design
• Develop and implement simulator software primarily in C++, with Java used as the test language
• Integrate, test and deliver HIL test benches within a Linux environment
• Interface with hardware and support system integration activities
• Provide technical follow‑up and coordination with internal and external teams
• Support verification, validation and testing activities throughout delivery

Skills & Experience

• Strong practical experience in C++ and Java
• Real‑time software design and debugging in a Linux environment
• Proven experience in Hardware‑in‑the‑Loop (HIL) design and implementation
• Solid understanding of multi‑process and/or multi‑threaded software architectures, ideally for hardware interfacing
• Experience with testing methodologies and unit testing frameworks
• Object‑oriented analysis and design using UML (or equivalent)
• Understanding of machine‑to‑machine communication protocols
• Strong knowledge of the software development lifecycle
• Familiarity with design patterns and best‑practice coding standards
• Excellent written and verbal communication skills, with the ability to explain complex technical concepts to non‑technical stakeholders
• Continuous Integration / Continuous Deployment (CI/CD)
• Spacecraft avionics systems
• ECSS software standards
• Space communication protocols including:
• SpaceWire
• MIL‑STD‑1553
• ECSS
• CAN

With five strategic offices in Belfast, Chester, Farnborough, London and Oxford, we work in partnership with our customers UK-wide to deliver high-impact engineering solutions.

SII UK is a trusted Aerospace and Defence engineering partner, supporting the delivery of complex, mission-critical programmes while helping to shape the future of innovation across next-generation systems and technologies.

Our teams contribute daily to creating a fulfilling, stimulating and career development focused work environment.

True to our human-centred values, we are committed to making SII UK a Great Place To Work®, having been certified 5 years running.

Joining SII UK means being part of our collective goals, guided by our mission “Let’s Tech Together,” and helping to build a digital future that is sustainable, at the heart of an environment that values learning & collaboration.

Who are we?

With five strategic offices in Belfast, Chester, Farnborough, London and Oxford, we work in partnership with our customers UK-wide to deliver high-impact engineering solutions.

SII UK is a trusted Aerospace and Defence engineering partner, supporting the delivery of complex, mission-critical programmes while helping to shape the future of innovation across next-generation systems and technologies.

Our teams contribute daily to creating a fulfilling, stimulating and career development focused work environment.

True to our human-centred values, we are committed to making SII UK a Great Place To Work®, having been certified 5 years running.

Joining SII UK means being part of our collective goals, guided by our mission “Let’s Tech Together,” and helping to build a digital future that is sustainable, at the heart of an environment that values learning & collaboration.