Senior Software Engineer(Frontend)

dunnhumby

Our mission:

dunnhumby

Senior Frontend Engineer

Youll collaborate across product, design, and engineering to deliver modular interfaces, contribute to architectural decisions, and set high standards for code quality, testing, and maintainability. If you enjoy solving complex problems, care deeply about frontend engineering excellence, and want to work on a modern tech stack that enables velocity and scale, wed love to hear from you.

Key Responsibilities

• Build scalable, dynamic web applications using

  React

  ,

  TypeScript

  , and modern JavaScript fundamentals.
• Develop accessible, responsive, and well-tested UI components using

  CSS-in-JS (Emotion)

  ,

  utility-first CSS

  , or similar approaches.
• Design and implement

  efficient state management patterns

  using

  Context API

  ,

  Zustand

  , or Redux.

• Contribute to the design and implementation of

  microfrontend architecture

  within a

  monorepo

  setup powered by

  Nx

  .
• Develop independently deployable modules with clear ownership and maintain reusable components using

  Storybook

  .

• Integrate frontend components with

  RESTful

  and

  GraphQL APIs

  , using

  BFF layers

  built with

  Fastify

  or

  Express

  to simplify backend access and optimize performance.

• Maintain a high standard of code quality through

  unit and integration tests

  using

  Jest

  ,

  React Testing Library

  , and

  Playwright

  .
• Work with DevOps to set up and maintain

  CI/CD pipelines

  using tools like

  GitLab CI

  ,

  Octopus

  , and

  Docker

  for containerized frontend builds on

  Kubernetes

  .

• Collaborate with

  backend engineers

  ,

  UX designers

  , and

  product managers

  to ship high-quality, end-to-end solutions.
• Document decisions, mentor junior engineers, and contribute to continuous improvements in engineering practices and tooling.

Required Skills & Experience

•  Experience from

  5-8years

  only
• Strong hands-on experience with

  React

  ,

  TypeScript

  , and modern JavaScript (ES6+)
• Deep understanding of

  state management

  ,

  component design

  , and

  styling techniques

• Experience integrating APIs (REST/GraphQL) and handling async flows
• Proficiency in

  frontend testing frameworks

  (Jest, RTL, Playwright)
• Working knowledge of

  CI/CD workflows

  , especially using GitLab, Octopus, or equivalent
• Familiarity with

  monorepos

  and

  modular frontend architecture

• Good grasp of

  performance

  ,

  accessibility

  , and

  browser compatibility

• Strong communication, documentation, and troubleshooting skills

Preferred Qualifications

• Experience with

  Nx

  ,

  Webpack

  , or

  Vite

  for build optimization
• Exposure to

  microfrontend patterns

  and independent deployment
• Hands-on experience with

  Fastify

  /

  Express

  for backend-for-frontend (BFF)
• Understanding of

  frontend observability

  (New Relic, Sentry, Google Analytics)
• Familiarity with

  design systems

  and reusable UI libraries
• Knowledge of deploying applications on

  Google Cloud Platform (GCP)

  or

  Azure

• Comfortable working in

  agile squads

  with clear ownership and shared infrastructure

What Sets This Role Apart

• Opportunity to

  work at scale

  with a

  modern frontend stack

  and architecture that prioritizes performance and autonomy
• Be part of a team that values

  modular delivery

  ,

  shared responsibility

  , and

  technical excellence

• Exposure to

  cutting-edge CI/CD

  ,

  Kubernetes

  , and

  containerized frontend builds

• A collaborative environment that encourages ownership and continuous learning
  

What you can expect from us

We wont 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.