Senior Full Stack Engineer

Job Description

hackajob is collaborating with Dunnhumby Ltd to connect them with exceptional professionals for this role.

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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.

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What we expect from you:

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• 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.
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• Comfortable owning a service on Kubernetes — deployments, probes, autoscaling, NetworkPolicies, RBAC — and debugging real failures from kubectl alone.
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• Solid working knowledge of Kubernetes operators and CRDs — you understand reconciliation loops, custom resources, and how operator-driven infrastructure differs from imperative provisioning.
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• 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.
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• Clear written communication — RFCs, ADRs, runbooks, PR descriptions other engineers can act on.
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Nice to have:

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

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