Senior Platform Engineer

About the job you're considering

Are you a Senior or Lead Platform Engineer who thrives on solving complex infrastructure problems and building production-grade platforms that operate reliably at scale while also influencing the design, strategy, and governance decisions that shape how teams deliver? Join our engineering team helping public sector clients build and continuously improve critical digital services using modern cloud-native and open-source tooling.
You’ll be part of a strong, established community of digital specialists. Together, you will share your ideas, innovate and grow. Our team of engineers support each other to deliver and develop professionally and you'll get to work alongside amazing people in one of the best cultures you can find.

Hybrid working: Your working location will vary depending on the client engagement, delivery phase, base location, and security requirements. You should expect a mix of home working, Capgemini offices, and client sites. More onsite presence is typically needed for discovery, workshops, and secure environments. This is not a 100% remote appointment.

Your Role

What You’ll Build & Deliver

You’ll help design, build, run and improve the platforms behind critical government services, systems that need to stay secure, observable and resilient even under national-scale load.

You’ll help build secure multi-cloud landing zones (majority AWS), GitOps-driven platforms and internal developer platforms that give engineers true self-service. You’ll modernise legacy estates into cloud-native architectures, unify observability across complex environments using OpenTelemetry and modern APM platforms, and drive FinOps-focused optimisation.

You’ll contribute to and help shape engineering standards, SRE-aligned operability, CI/CD performance, supply-chain security, platform-as-a-product thinking and event-driven automation. You’ll collaborate closely with client teams, bringing clear thinking and bold ideas to co-create modern platforms that make a real national-scale difference.

Your scope & influence as a Senior/Lead Platform Engineer
•    Act as a senior technical voice across the engagement, influencing platform strategy, design choices and governance guardrails.
•    Lead technical workshops and design reviews with client stakeholders and engineering teams.
•    Set and evolve platform standards (security, reliability, operability, CI/CD, observability) and help teams adopt them in practice.
•    Define SLOs, improve reliability, and lead incident reviews.
•    Coach engineers through mentoring, pairing and pragmatic hands-on technical leadership.
•    Bring platform-as-a-product thinking: golden paths, reusable capabilities and sustainable operations.
•   Remain hands-on, by actively contributing to designs, code, reviews and problem-solving while leading and mentoring others.

What this looks like in practice
•    Designing secure-by-default multi-account AWS landing zones (awareness of Azure/GCP patterns also relevant).
•    Building internal developer platforms (IDPs) and self-service automation that boost developer experience.
•    Deploying and operating hardened Kubernetes platforms (EKS/AKS).
•    Creating unified observability stacks with OpenTelemetry, Prometheus and Grafana.
•    Delivering cloud-native modernisation and transformation of legacy systems.
•    Engineering high-quality CI/CD pipelines with DevSecOps & supply chain integrity.
•    Implementing event-driven, automated infrastructure capabilities.
•    Driving FinOps and cloud optimisation across complex estates.
•    Applying platform-as-a-product thinking to create scalable, reusable capabilities.
•    Providing hands-on technical skills & leadership and collaborating with client teams.

We like engineers who are curious, opinionated about good engineering and comfortable taking ownership of systems that need to work every time, at national scale.

If you want to solve hard problems, push modern engineering forward and deliver platforms that genuinely make a difference — you’ll fit right in.

We're 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.

Your Security Clearance

Baseline Personnel Security Standard (BPSS)
To be successfully appointed to this role you will need to undergo Baseline Personnel Security Standard checks.
There are certain criteria and checks required for BPSS, and throughout the recruitment process, you will be asked questions about your security clearance eligibility such as, but not limited to, country of residence and nationality.

In addition to BPSS, you will also need SC (Security Check) Clearance or to be eligible for this level of clearance (by being a UK resident for at least 5 years and not having left the country for more than 28 consecutive days during this period)

Make it real – what does it mean for you?

You’d be joining an accredited Great Place to work for Wellbeing in 2023. 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 reimagine what’s possible: creating value for the world’s leading organisations through technology to build a sustainable, more inclusive future. You will work with a range of clients all with a unique set of business, technological and societal ambitions, which will make a real impact across the UK.
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 think tanks to hackathons, and access to 250,000 courses with numerous external certifications from AWS, Microsoft, Harvard ManageMentor, Cybersecurity qualifications and much more.
You’ll be bringing your unique skills and perspectives to the team, inspiring and taking inspiration from your teammates as you unlock value in everything you do. You’ll be joining a professional community of experts, who have got your back and will support you, every step of the way.

Why you should consider Capgemini

Growing clients’ businesses while building a more sustainable, more inclusive future is a tough ask. But when you join Capgemini, you join a thriving company and become part of a diverse collective of free-thinkers, entrepreneurs and industry experts.

A powerful source of energy that drives us all to 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. And you’ll use them to help our clients leverage technology to grow their business and give innovation that human touch the world needs. So, it might not always be easy, but making the world a better place rarely is.

About Capgemini

Capgemini is a global business and technology transformation partner, helping organisations to accelerate their dual transition to a digital and sustainable world, while creating tangible impact for enterprises and society. It is a responsible and diverse group of 340,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fuelled by its market-leading capabilities in AI, cloud and data, combined with its deep industry expertise and partner ecosystem. The Group reported 2023 global revenues of €22.5 billion.