Python Developer

CGI’s Space, Defence and Intelligence business unit focuses on delivering contemporary and innovative technical solutions to government agencies tackling some of the most complex challenges. We design, build, and operate bespoke, mission-critical systems that help keep the UK safe and secure.

We are looking for experienced Python Developers to join our cross-functional teams. Working closely with our clients, you will help design, build, and deliver secure, scalable solutions in a highly rewarding and impactful environment. CGI places strong emphasis on learning and development, ensuring your skills evolve alongside the latest technologies. Our culture promotes innovation, collaboration, and ownership-ideal for motivated self-starters.

Due to the secure nature of the work, these roles require UK Security Clearance and sole UK nationality. Candidates should either already hold DV clearance or be willing and eligible to obtain it.

Candidate profile

As a Python Developer, you will contribute to the delivery of cloud-based, data-intensive systems. Your responsibilities will include:

Designing, developing, and maintaining robust Python applications

Building scalable APIs and backend services

Working with large datasets and data processing pipelines

Contributing to system architecture and technical design decisions

Automating workflows and improving deployment pipelines

Maintaining and enhancing cloud-based environments (primarily AWS)

Supporting live systems and implementing enhancements when required

Collaborating with cross-functional teams in agile environments

We’re looking for individuals with a strong problem-solving mindset who can adapt quickly to evolving client needs.

We are particularly interested in candidates with strong Python development experience, alongside exposure to some of the following:

Core Skills:

Python (primary language)

Experience with frameworks such as FastAPI, Flask, or Django

Strong understanding of RESTful APIs and microservices architecture

Cloud & DevOps:

AWS (e.g. Lambda, EC2, S3, RDS)

CI/CD tools such as Jenkins or GitLab CI/CD

Infrastructure as Code (e.g. Terraform)

Data & Integration:

Working with large datasets and data pipelines

Tools such as Apache NiFi or similar integration frameworks

Scripting & Automation:

Bash, Ansible

Monitoring & Logging:

ELK Stack (Elasticsearch, Logstash, Kibana), Grafana

Testing & Quality:

Automated testing frameworks (e.g. PyTest, Cucumber)

Code quality tools such as SonarQube

Experience across multiple areas is beneficial, but not essential. A willingness to learn and contribute across the stack is key.

Candidates must hold, or be eligible to obtain, Developed Vetting (DV) clearance.

Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll 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. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.

Your work creates value. You’ll 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.

You’ll shape your career by joining a company built to grow and last. You’ll 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 team-one of the largest IT and business consulting services firms in the world.

Discover CGI

London, England, United Kingdom > 1000 employees IT services We are a global business with 91,500 professionals across hundreds of locations worldwide, providing end-to-end IT and business process services that drive our clients’ businesses. In the UK alone, we have around 6,000 member-partners working across 19 towns and cities, doing everything from writing complex code to designing sophisticated software solutions. The work we do powers some of the most ambitious projects that touch the lives of many. Our approach sets us apart, characterised by our proximity model, international presence, expertise, and operational excellence. We organise our operations within metro markets where our clients have concentrated footprints, empowering our local teams to build trusted, in-person relationships. As you build your career here, you’ll develop your skills, share your insights, and work side-by-side with colleagues and clients on innovative solutions that address the most complex issues. Our commitment to ownership, flexibility, and being approachable makes us easy to do business with. Join us, and together, as owners, let’s turn meaningful insights into action to meet the needs and balance the interests of our clients, shareholders, communities, and each other. Benefits: - Insurance coverage - Medical benefits - Pension plan - Member Assistant Programme - Check4Cancer - Flexible time off - Share Purchase Plan - Member discounts - Dental benefits - Vision benefits - Profit Participation Plan - Health and Wellbeing Programme