Senior Full Stack Engineer in Manchester

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 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, or 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.

What you can expect from us:

We won’t just meet your expectations. We’ll defy them. So you’ll enjoy the comprehensive rewards package you’d expect from a leading technology company. But also, a degree of personal flexibility you might not expect. Plus, thoughtful perks, like flexible working hours and your birthday off. You’ll also benefit from an investment in cutting-edge technology that reflects our global ambition. But with a nimble, small-business feel that gives you the freedom to play, experiment and learn. And we don’t just talk about diversity and inclusion. We live it every day – with thriving networks including dh Gender Equality Network, dh Proud, dh Family, dh One, dh Enabled and dh Thrive as the living proof.

We want everyone to have the opportunity to shine and perform at your best throughout our recruitment process. Please let us know how we can make this process work best for you.

Our approach to Flexible Working:

At dunnhumby, we value and respect difference and are committed to building an inclusive culture by creating an environment where you can balance a successful career with your commitments and interests outside of work. We believe that you will do your best at work if you have a work/life balance. Some roles lend themselves to flexible options more than others, so if this is important to you please raise this with your recruiter, as we are open to discussing agile working opportunities during the hiring process.