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 supports 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.

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.

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), Git Ops‑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 Open Telemetry and modern APM platforms, and drive Fin Ops‑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.

• 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.

• 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 Open Telemetry, Prometheus and Grafana.
• Delivering cloud‑native modernisation and transformation of legacy systems.
• Engineering high‑quality CI/CD pipelines with Dev Sec Ops  & supply chain integrity.
• Implementing event‑driven, automated infrastructure capabilities.
• Driving Fin Ops 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.

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…