Python Developer

Capgemini; Greater London; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

Capgemini is seeking a Python Developer to build secure, scalable backend services and AI-enabled capabilities. You’ll work across engineering, product, design and data teams to turn complex requirements into practical solutions, with emphasis on API design, testing, and clean code.

You’ll contribute to secure, cloud-hosted applications and CI/CD pipelines, collaborating in a hybrid model that blends Capgemini offices, client sites, and remote work, while maintaining security and compliance in

Qualifications

• Strong Python development experience with backend services and RESTful APIs.
• Experience with Python frameworks, testing, packaging, and async programming where relevant.
• Solid software engineering fundamentals: clean code, OO/functional design, testing, debugging, API design and source control.

Responsibilities

• Design, build, test and maintain secure, scalable backend services and APIs meeting business needs.
• Deliver production-quality software with strong testing, reviews and documentation.
• Integrate apps with internal/external services, ensuring security and resilience.
• Build and support AI-enabled capabilities using generative AI patterns.
• Apply evaluation, guardrails and human oversight for reliable AI delivery.
• Diagnose defects and performance issues, improving reliability.
• Collaborate with product, design, data and engineering teams to translate requirements.
• Contribute to design and estimation and deliver to quality expectations.
• Continuously evolve engineering, AI and security knowledge.

Skills

Python development

Backend APIs

Python frameworks

Automated testing

Databases

Generative AI

CI/CD

Security practices

Communication

Tools

FastAPI

pytest

Docker

CI/CD tools

Job description

Join Capgemini's Financial Services Business Unit within the Cloud & Custom Applications (C&CA) practice as a Python Developer, helping clients turn complex requirements into secure, scalable and future-ready solutions. You'll design and deliver high-quality backend services while contributing to AI-enabled applications that create meaningful business outcomes. Working collaboratively across engineering, product, design and data teams, you'll combine strong software engineering with an AI-fluent mindset to solve problems with purpose, continuously evolve our capabilities and help architect tomorrow. This is an opportunity to make a real impact while sharing knowledge and contributing to a future-ready engineering community.

The places that you work from day to day will vary according to your role, your needs, and those of the business; it will be a blend of Company offices, client sites, and your home; noting that you will be unable to work at home 100% of the time.

Key Responsibilities:

• Design, build, test and maintain secure, scalable backend services and APIs that meet business and user needs.
• Deliver production-quality software through strong engineering, testing, review and documentation practices.
• Integrate applications with internal services, data sources and external APIs while ensuring security, resilience and effective error management.
• Build and support AI-enabled capabilities, applying generative AI patterns appropriately to real-world use cases.
• Apply effective evaluation, monitoring, guardrails and human oversight to help ensure AI solutions are reliable, secure and responsibly delivered.
• Diagnose and resolve defects, performance challenges and operational incidents, using evidence to continuously improve reliability.
• Collaborate with product, design, data and engineering colleagues to translate requirements into practical, maintainable solutions.
• Contribute to technical design and estimation, taking ownership of agreed outcomes and delivering to quality expectations.
• Continuously evolve engineering, AI and security knowledge, sharing insights and helping build an AI-fluent, future-ready engineering community.

Must-Have Skills:

• Strong hands-on Python development experience, including backend applications, services and RESTful APIs.
• Experience with Python development frameworks, automated testing, dependency/package management and asynchronous programming where relevant.
• Strong software engineering fundamentals, including clean code, object-oriented and/or functional design, testing, debugging, API design and source control.
• Experience with relational and/or NoSQL databases, efficient querying and data modelling.
• Practical experience building or integrating generative AI solutions using LLM APIs and orchestration approaches.
• Understanding of RAG, embeddings, vector stores, prompt design, agent workflows, model evaluation and AI safety/guardrails.
• Experience delivering cloud-hosted applications, containerised workloads and CI/CD pipelines.
• Awareness of secure development practices, including secrets management, access control, data protection and dependency security.
• Strong analytical and problem-solving capability, including working through ambiguous technical challenges.
• Clear written and verbal communication skills, with the ability to explain technical decisions to technical and non-technical audiences.

Good-to-Have Skills

• Experience with FastAPI, Flask or Django and pytest.
• Experience building full-stack applications or working closely with frontend engineers on API contracts and end-to-end user journeys.
• Familiarity with application logging, monitoring and distributed tracing approaches and tooling.
• Experience working in regulated, enterprise-scale or security-conscious environments.

We are a Disability Confident Employer:

Capgemini is proud to be a Disability Confident Employer (Level 2) under the UK Government's Disability Confident scheme. As part of our commitment to inclusive recruitment, we will offer an interview to all candidates who:

• Declare they have a disability, and
• Meet the minimum essential criteria for the role.

Please opt in during the application process.

Make It Real (what does it mean for you):

• You’d be joining an accredited Great Place to work for Wellbeing in 2024. Employee wellbeing is vitally important to us as an organisation. We see a healthy and happy workforce a critical component for us to achieve our organisational ambitions.
• To help support wellbeing we have trained 'Mental Health Champions' across each of our business areas, and we have invested in wellbeing apps such as Thrive and Peppy.
• You will be empowered to explore, innovate, and progress. You will benefit from Capgemini's 'learning for life' mindset, meaning you will have countless training and development opportunities from thinktanks to hackathons, and access to 250,000 courses with numerous external certifications from AWS, Microsoft, Harvard ManageMentor, Cybersecurity qualifications and much more.
• You will be joining one of the World's Most Ethical Companies, as recognised by Ethisphere for 13 consecutive years. We live our values by making ethical business choices every day. Working ethically is at the centre of our culture at Capgemini, meaning you will be helping to create a future we can all be proud of.

Why you should consider Capgemini:

Growing clients' businesses while building a more sustainable, more inclusive future is a tough ask. When you join Capgemini, you'll join a thriving company and become part of a collective of free-thinkers, entrepreneurs and industry experts. We find new ways technology can help us reimagine what's possible. It’s why, together, we seek out opportunities that will transform the world’s leading businesses, and it’s how you’ll gain the experiences and connections you need to shape your future. By learning from each other every day, sharing knowledge, and always pushing yourself to do better, you'll build the skills you want. You'll use your skills to help our clients leverage technology to innovate and grow their business. So, it might not always be easy, but making the world a better place rarely is.

About Capgemini:

Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organisations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2024 global revenues of €22.1 billion.