Python Software Engineer – Space Systems

At CGI were shaping the future of secure space technology delivering innovative solutions that support critical Intelligence Surveillance and Reconnaissance (ISR) capabilities. As a Python Software Engineer within our growing Secure Space Systems business youll help transform complex scientific and engineering data into secure high-performance solutions that make a real difference. Youll take ownership of meaningful technical challenges explore creative approaches to emerging requirements and collaborate with talented professionals to deliver cutting-edge capabilities. From early-stage prototypes to fully developed solutions youll have the freedom to innovate the support to develop your expertise and the opportunity to contribute to projects at the forefront of space and defence technology.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK Best Employer by the Financial Times. We offer a competitive salary excellent pension private healthcare plus a share scheme (3.5% 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector including our Armed Forces and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and youll be part of an open friendly community of experts. Well train and support you in taking your career wherever you want it to go.

Due to the secure nature of the programme you will need to hold UK Security Clearance or be eligible to go through this clearance. This is a hybrid position.

In this role you will design develop and deliver secure scalable Python microservices that process complex scientific and engineering data supporting mission-critical space-based Intelligence Surveillance and Reconnaissance (ISR) capabilities. Working within an Agile environment you will take ownership of technical solutions from initial prototyping through to production-ready delivery ensuring high standards of performance security and reliability.

You will collaborate with multidisciplinary teams to solve evolving technical challenges bringing fresh ideas and a pragmatic delivery-focused approach to every project. Supported by experienced colleagues and a culture of continuous learning you will have opportunities to explore emerging technologies enhance development practices and contribute to the ongoing growth of CGIs Secure Space Systems business.

Key responsibilities:
- Design & Develop: Build secure scalable Python microservices to process complex scientific and engineering datasets.
- Innovate & Prototype: Develop proof-of-concept solutions and evolve them into robust production-ready applications.
- Build & Integrate: Design and implement RESTful APIs using OpenAPI and JSON to enable reliable system integration.
- Test & Optimise: Implement automated testing and containerised deployment using Docker ensuring high-quality performant solutions.
- Collaborate & Deliver: Work within Agile teams using Scrum SAFe and DevSecOps practices to deliver solutions against evolving requirements.
- Solve & Improve: Take ownership of technical challenges identify opportunities for improvement and develop creative practical solutions.
- Learn & Grow: Explore new technologies share knowledge and contribute to a supportive collaborative engineering environment.

To succeed in this role you will bring strong Python development experience particularly in building and testing containerised microservices and RESTful APIs. You will be adaptable collaborative and comfortable solving complex technical challenges in fast-moving environments. A proactive approach to learning excellent communication skills and a commitment to delivering secure high-quality software will be essential.

Essential skills and experience:
- Python Development: Strong commercial experience developing Python applications and microservices.
- Microservices & Containers: Proven experience building deploying and testing containerised microservices using Docker.
- API Development: Recent experience designing and developing RESTful APIs using OpenAPI and JSON.
- Automated Testing: Strong understanding of automated testing practices and software quality assurance.
- Agile Delivery: Ability to work effectively within Agile development environments and adapt to changing requirements.
- Problem-Solving: Pragmatic delivery-focused approach with the ability to solve complex technical challenges.
- Collaboration & Communication: Excellent interpersonal skills and the ability to contribute effectively within multidisciplinary teams.
Highly desirable:

- Experience working with Geographic Information Systems (GIS) technologies.

Desirable:
- Experience with Apache NiFi or similar workflow automation technologies.
- Familiarity with Temporal or comparable workflow orchestration technologies.
- Experience developing applications using PostgreSQL.
Security clearance and location requirements:
- Applicants must be UK nationals and hold Security Check (SC) clearance or be eligible to obtain it.
- Due to programme-specific security requirements applicants must not hold unrestricted travel permits such as OCI or NICOP.
- Ability to work from CGIs Leatherhead office at least one day per week as part of a hybrid working arrangement.

• Agile
• Communication
• JSON Web Token (JWT)
• Postgre SQL
• Python
• RESTful (Rest-APIs)

Together as owners lets turn meaningful insights into action.

Life at CGI is rooted in ownership teamwork respect and belonging. Here youll reach your full potential because

You are invited to be an owner from day 1 as we work together to bring our Dream to life. Thats why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our companys strategy and direction.

Your work creates value. Youll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas embrace new opportunities and benefit from expansive industry and technology expertise.

Youll shape your career by joining a company built to grow and last. Youll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

That same commitment to fairness extends to how we use technology. To support our recruitment team AI tools may be used to help assess applications though they never replace human judgement. All hiring decisions remain entirely in the hands of our recruitment professionals.

Come join our teamone of the largest IT and business consulting services firms in the world.