Senior Full Stack Engineer

We're looking for a Senior Full Stack Engineer to join our Application Platform team in Manchester, on a hybrid basis. You'll be one of the first product engineers on dunnhumby's new continuous-deployment paved road, building a customer-facing analytics product end-to-end and showing the rest of engineering what "production-ready on the platform" looks like.

What we expect from you:

• Senior-level experience building and running production services in C# / ASP.NET Core and TypeScript / Next.js / React — with working knowledge of the other side and an appetite to grow into both.
• Comfortable owning a service on Kubernetes — deployments, probes, autoscaling, NetworkPolicies, RBAC — and debugging real failures from kubectl alone.
• Solid working knowledge of Kubernetes operators and CRDs — you understand reconciliation loops, custom resources, and how operator-driven infrastructure differs from imperative provisioning.
• Hands-on with at least one of GCP (GKE, Cloud SQL, Pub/Sub, Secret Manager) or Azure (AKS, Azure DB for PostgreSQL, Key Vault), and willing to learn the other.
• Clear written communication — RFCs, ADRs, runbooks, PR descriptions other engineers can act on.

Nice to have:

• Crossplane experience — authoring Compositions, CompositeResourceDefinitions, or custom providers.
• GitOps fluency with ArgoCD and Helm, and CI/CD authorship in GitLab.
• Building custom Kubernetes operators with the Operator SDK or Kubebuilder.
• Service mesh experience (Istio or Linkerd).
• Prior experience migrating a product from bundled releases to continuous deployment.
• Backstage or internal developer portal contributions.

Responsibilities:

• Shape clear, testable acceptance criteria with Product and Design
• Build and own end‑to‑end products across .NET services, TypeScript frontend, PostgreSQL, and GitOps deployment
• Design scalable backend systems (APIs, event handling, clean architecture patterns)
• Deliver high‑quality frontend experiences with accessible components and strong data/state management
• Work with cloud‑native, declarative infrastructure (Kubernetes, Crossplane, CRDs)
• Maintain high standards across testing (unit, integration, contract) and code quality
• Apply strong security practices across backend and frontend systems
• Build meaningful observability (tracing, logging, SLOs) focused on real user impact
• Take a cost‑aware approach to scaling and resource usage
• Participate in an on‑call rotation once ramped up
• Use AI‑assisted development tools (e.g. Copilot, Claude) effectively in day‑to‑day work