Principal Full Stack Engineer - 8 Month FTC

AND Digital Limited; Greater London; On-site; GBP 110,000 - 170,000; Full time

Benefits offered by this job

25 days holiday

Pension: 6% employee + 2% employer

Healthcare (Aviva)

Flexibenefit allowance

Life Assurance

Income Protection

Eye test

Parental Benefits

Job summary

AND Digital Limited in the United Kingdom is seeking a Principal Full Stack Engineer to shape the architectural vision across modern web platforms. You will guide design decisions, mentor engineers, and ensure delivery of scalable, resilient systems that meet client needs.

You will work with React 19, Node.js, TypeScript, MFE, Vite, Nx, pnpm, Tailwind, and modern testing and observability tools to build high-quality software.

Qualifications

• Track record of building scalable, distributed web apps.
• Strong focus on type safety and runtime validation.
• Experience leading full-stack engineering and DX improvements.

Responsibilities

• Lead architectural vision across the full modern web stack.
• Establish engineering standards for scalable, resilient systems.
• Collaborate with multidisciplinary teams and clients.
• Drive end-to-end testing and quality across units and integration.
• Contribute to observability and deployment pipelines.

Skills

Strong communication

Problem solving

Leadership

Collaboration

Mentoring

Adaptability

Tools

React 19

Node.js

TypeScript

Micro Frontends

Vite module federation

Nx monorepos

pnpm

Tailwind CSS

React Router

Zustand

TanStack Query

Express 5

OpenAPI

Zod

Vitest

Playwright

MSW

ESLint

Prettier

Husky

LaunchDarkly

Grafana Faro

AWS

Terraform

GitLab CI/CD

Job description

Principal Full Stack Engineer

Who We Are:

We’re on a mission to close the world’s tech skills gap. We help organisations navigate the future of technology, combining human expertise, emerging tech and AI to deliver better outcomes, faster. Since 2014, we’ve worked side-by-side with clients to solve complex challenges, build high-performing teams, and create lasting capability. As technology continues to evolve, we believe the most successful organisations will be those that combine the best of both: human ingenuity AND intelligent technology. That belief is embedded in everything we do. We call it the genius of the AND: deep expertise AND practical delivery, innovation AND responsibility, ambitious work AND sustainable careers. Through our Guide, Build and Equip approach, we help organisations embrace change, deliver meaningful impact, and develop the skills they need to thrive in an increasingly agentic world.

About you:

• You care deeply about producing high-quality work that delivers real value
• You’re comfortable navigating ambiguity and solving complex problems collaboratively
• You bring strong expertise in your craft, alongside a willingness to keep learning
• You communicate clearly and build trust quickly with clients and teammates
• You’re pragmatic, adaptable and outcome-focused
• You enjoy sharing knowledge and helping others grow
• You value low-ego collaboration and enjoy working as part of multidisciplinary teams

What you’ll bring to the table:

• Lead the architectural vision and engineering standards across the full modern web stack, balancing cutting-edge tooling with scalable, resilient, and maintainable systems
• Deep hands-on expertise with React 19, Node.Js and TypeScript, crafting performant, accessible, and responsive user interfaces
• Proven track record architecting distributed web applications using Micro Frontends (MFE) and Vite Module Federation within scalable Nx monorepos (managed via pnpm)
• Strong mastery of modern UI styling, routing, and client state: leveraging Tailwind CSS v4, React Router v7, Zustand v5 for global state, and TanStack Query v5 for server-state caching and synchronization
• Extensive experience designing and building robust API / BFF layers using Node.js with Express 5, automated type generation (Hey API / OpenAPI, zod-to-openapi, Swagger UI), and interfacing with legacy or on-prem systems (exposure to or knowledge of PHP is advantageous)
• Expertise in end-to-end type safety, runtime schema validation, and contract-driven development using Zod across both frontend applications and backend services
• Full-lifecycle testing leadership across unit, integration, and end-to-end layers using Vitest, Playwright, and Mock Service Worker (MSW v2)
• High commitment to developer experience (DX) and code quality standards using Oxlint, ESLint, Prettier, and Husky
• Practical experience with progressive rollout strategies, targeted experimentation, and runtime configuration using LaunchDarkly
• End-to-end ownership of full-stack observability and telemetry leveraging Grafana Faro for client-side monitoring alongside Pino, AWS CloudWatch, and Grafana for backend systems
• Hands-on proficiency with cloud infrastructure and DevOps practices, including Terraform (IaC), AWS services (ECS Fargate, ALB, API Gateway), and automated GitLab CI/CD deployment pipelines

Why join AND Digital?

We’re building a culture where talented people can do meaningful work, continue growing, AND enjoy the journey along the way. Our model is designed to build belonging and connection: we’re organised into regional ‘Clubs’ of no more than 80 people, so you (and our clients) get the benefits of that small company feel while also being connected to a larger whole. Our Practice Areas act as a ‘second home’ for our ANDis - a place where you can innovate and learn with like-minded experts who care deeply about their craft, support each other generously, and believe the best ideas come from collaboration, not hierarchy. Our culture is rooted in our values of Wonder, Share and Delight, and shows up through five traits that we celebrate and nurture in all our ANDis: we value curiosity, ambition and a growth-mindset. We are deeply client-centric. Most important of all we are human - we create an inclusive environment where people feel trusted, supported and able to be themselves.

By joining AND, we’ll provide:

• 25 days bookable holiday + flexible Bank Holidays
• Pension: 6% of salary paid by AND Digital with a further 2% paid by you (can be increased by choice).
• Aviva healthcare cover (including pre-existing condition cover) for you.
• Flexibenefit: £1000 assigned to you via our benefits portal to select or upgrade the benefits that suit you the most. Any unused allowance from the £1000 can be taken as cash.
• Life Assurance.
• Income Protection.
• Eye test + first pair of glasses.
• Parental Benefits: Generous Enhanced Maternity and Enhanced Partner (Paternity) Leave.

Equal Opportunities Statement:

Diversity and inclusion are hugely important to us, and we’re committed to providing equal opportunities for all. We’re actively recruiting for a diverse and inclusive workforce so want to ensure we do everything we can to support your application. We want you to feel safe and empowered to let us know if you need any adjustments to be made to your application or interview process, so please speak to our recruitment team.

AI Statement:

We champion tech that helps people work smarter, but we want to get to know you! If you use AI to assist with your application or interview prep, please ensure all information submitted remains an accurate, truthful representation of your personal achievements and capabilities rather than generating false or misleading information. We may reject applications where AI is used inappropriately at any stage of the recruitment process.