Software Engineer - Python & AI (DV Cleared)

CGI Group Inc.; Bagstone; On-site; GBP 65,000 - 90,000; Full time

Benefits offered by this job

Competitive salary

Excellent pension

Private healthcare

Employee share scheme

Career development and training

Job summary

CGI UK, Space, Defence & Intelligence, Gloucester, on-site five days a week, seeks a Software Engineer to design, develop and maintain secure, scalable software for national security programmes. You’ll work across the full software development lifecycle, apply modern practices and explore AI capabilities to deliver valuable solutions.

You’ll contribute to backend services with Python, FastAPI, Celery, and API components, plus frontend work with React/TypeScript.

Qualifications

• Proven experience designing, developing, testing and maintaining software across the full lifecycle.
• Strong knowledge of Python and building maintainable, scalable software solutions.
• Practical experience with React, TypeScript, Docker, Pydantic, FastAPI and Celery; LangChain or AWS a plus.
• Experience working in agile delivery environments and collaborating with cross-functional teams.
• Knowledge or experience of AI development to solve business or technical challenges.
• Ability to apply software engineering principles, development standards and best practices to deliver reliable applications.

Responsibilities

• Design and develop secure, scalable software applications using modern technologies.
• Innovate with AI-driven solutions for complex client challenges.
• Contribute across the full software development lifecycle from requirements analysis to deployment and ongoing support.
• Develop backend services, APIs and application components using Python, FastAPI and Celery.
• Create responsive user interfaces with React and TypeScript.
• Automate and optimise using Docker and cloud technologies (AWS) for efficient delivery.
• Collaborate with engineers, technical specialists and clients to understand requirements and resolve challenges.
• Learn and share knowledge to support continuous improvement across the team.

Skills

Software engineering

Python development

Modern development technologies

Agile development

AI development

Application development

Problem solving

Collaboration & communication

Security clearance

On-site working

Tools

React

TypeScript

Docker

Pydantic

FastAPI

Celery

LangChain

AWS

Job description

In this role, you will design, develop and maintain secure, scalable software solutions that support critical national security programmes. Working across the full software development lifecycle, you'll take ownership of technical challenges, from initial concept and design through to development, testing, deployment and continuous improvement. You'll apply modern engineering practices and automation to build reliable applications that deliver measurable value for clients. You'll also have the opportunity to explore and develop artificial intelligence capabilities, using emerging technologies to solve real-world challenges and enhance existing systems. Working collaboratively with cross-functional teams, you'll contribute fresh ideas, share knowledge and help shape technical solutions. You'll be supported by experienced colleagues who encourage innovation, continuous learning and the development of your technical expertise. Key responsibilities include:

• Design & Develop: Build secure, scalable and maintainable software applications using modern development technologies and engineering best practices.
• Innovate with AI: Explore, prototype and implement AI-driven solutions that address complex client challenges and improve operational capabilities.
• Develop & Deliver: Contribute across the full software development lifecycle, from requirements analysis and solution design through to testing, deployment and ongoing support.
• Build & Integrate: Develop backend services, APIs and application components using technologies such as Python, FastAPI, Pydantic and Celery.
• Create & Enhance: Support the development of responsive user interfaces using React and TypeScript, contributing to effective end-to-end solutions.
• Automate & Optimise: Apply automation, containerisation and cloud technologies, including Docker and AWS, to improve delivery efficiency, reliability and scalability.
• Collaborate & Solve: Work closely with engineers, technical specialists and clients to understand requirements, resolve challenges and deliver effective solutions.
• Learn & Share: Explore emerging technologies, contribute to technical discussions and share knowledge to support continuous improvement across the team.

To succeed in this role, you should have a strong foundation in software engineering, with hands‑on experience developing applications using modern programming languages, frameworks and development practices. You'll bring a proactive approach to problem‑solving, an interest in artificial intelligence and the ability to work effectively within agile, multidisciplinary teams. You don't need experience in every technology listed, but you should demonstrate strong capability in relevant areas and a willingness to develop your expertise further.

Essential experience and qualifications:

• Software Engineering: Proven experience designing, developing, testing and maintaining software applications across the full development lifecycle.
• Python Development: Strong working knowledge of Python and experience building maintainable, scalable software solutions.
• Modern Development Technologies: Practical experience with some of the following technologies: React, TypeScript, Docker, Pydantic, FastAPI, Celery, LangChain or AWS.
• Agile Development: Experience working within agile delivery environments, contributing to iterative development, testing and continuous improvement.
• AI Development: Knowledge or practical experience of AI development, including applying AI technologies, frameworks or tools to solve business or technical challenges.
• Application Development: Demonstrated ability to apply software engineering principles, development standards and best practices to deliver reliable applications.
• Problem‑Solving: Strong analytical and troubleshooting skills, with the ability to investigate technical challenges and develop effective solutions.
• Collaboration & Communication: Ability to work effectively with cross‑functional teams, share technical knowledge and communicate clearly with stakeholders.
• Security Clearance: Must be a sole UK national and hold, or be willing and eligible to undergo, UK Developed Vetting (DV) security clearance.
• On‑site Working: Ability to work from CGI or client sites in Gloucester five days per week.

Desirable experience:

• Full-stack development experience across frontend and backend technologies.
• Experience developing applications using React and TypeScript alongside Python-based backend services.
• Familiarity with AI frameworks such as LangChain and integrating AI capabilities into software applications.
• Experience using Docker, AWS and automation tools within modern development environments.

Together, as owners, let’s turn meaningful insights into action.

CGI UK | Space, Defence & Intelligence | Gloucester | On‑site, 5 days per week | DV Clearance At CGI, we're developing innovative software and AI‑powered solutions that help protect the UK and strengthen national security. As a Software Engineer within our Space, Defence and Intelligence business, you'll help design and deliver secure, scalable applications that solve complex challenges and support mission‑critical operations. You'll take ownership of meaningful development work, explore emerging AI technologies and bring creative ideas to life, turning technical innovation into real‑world impact. Working alongside experienced engineers and specialists, you'll have the freedom to develop your expertise, contribute to important technical decisions and help shape future capabilities. Supported by CGI's collaborative culture and commitment to professional growth, you'll build solutions that genuinely make a difference. 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 you'll be part of an open, friendly community of experts. We'll train and support you in taking your career wherever you want it to go., 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.