Software Engineer- Platform

dunnhumby is the global leader in Customer Data Science, partnering with the world’s most ambitious retailers and brands to put the customer at the heart of every decision. We combine deep insight, advanced technology, and close collaboration to help our clients grow, innovate, and deliver measurable value for their customers. dunnhumby employs nearly 2,500 experts in offices throughout Europe, Asia, Africa, and the Americas working for transformative, iconic brands such as Tesco, Coca-Cola, Nestlé, Unilever and Metro.

We're looking for a Platform Engineer to join our Application Platform team. You'll help build and operate the deployment platform, tooling, and developer experience that every engineering team at dunnhumby relies on to ship software to production. This role can be based from either our London or Manchester office.

You'll join at a moment when we're moving our retail analytics platform from monthly bundled releases to continuous per-service deployment on Kubernetes. You'll be hands-on with that migration in your first few months and then stay on long-term as a core member of the team that owns and evolves the platform. It's a clear path into senior platform engineering for someone who has shipped production Kubernetes work and wants to grow their craft on a platform used by hundreds of engineers.

Responsibilities

Build and maintain the platform primitives that enable service teams to deploy independently, including ArgoCD application manifests, GitOps repository lifecycles, reusable Helm chart templates, and External Secrets Operator configuration. Pair with engineers across product and data teams as they onboard onto the new platform, addressing repeated questions at the template layer to prevent recurring issues. Contribute to platform design discussions and help shape the paved road that engineers across dunnhumby build on.

Author and maintain reusable GitLab CI pipeline templates covering build, test, publish, deploy, and post‑deploy stages. Work with service teams to migrate pipelines onto the platform standard and retire bespoke per‑service deployment scripts. Continuously improve build times, pipeline reliability, and developer feedback loops.

Respond to platform alerts during working hours, triaging ArgoCD sync failures, secret synchronisation errors, and flaky pipelines. Join the Application Platform on‑call rotation once ramped up (typically after the first few months). Instrument platform tooling with structured logging and dashboards to improve visibility without manual investigation.

Requirements

and create smoke tests for deployment workflows — no green CI, no merge. Keep migration playbooks, ArgoCD setup guides, and per‑service pipeline documentation accurate and up to date. Share learnings with the squad through regular knowledge‑sharing sessions.

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