Senior Fullstack Engineer

1 week ago

London, Greater London, United Kingdom Zelt Full time £60,000 - £120,000 per year

About Zelt
Zelt is on a mission to rebuild how organisations run. Our all-in-one platform helps modern companies manage their people across payroll, onboarding, time off, IT provisioning and more, in a seamless and automated way.

We are the only platform on G2 named a Global Momentum Leader across HR, Payroll and IT, and we are just getting started. Our product is technically ambitious, structurally different from anything else on the market, and already trusted by forward-thinking companies.

Why This Role Matters
As a Senior Fullstack Engineer at Zelt you will own product development end to end, from architecture to marketing events.

This is the ideal moment to join: Zelt has product-market fit and strong backing, yet it is still early enough that your decisions will shape the platform's architecture and user experience for years to come. Every feature you build will reach customers quickly and be visible in the product.

You will join a lean, product-focused team where your input shapes both what we build and how we deliver it. This is a chance to work with a diverse, international team on a product that positively impacts customers every day.

What You Will Do

  • Design, build and maintain scalable applications across the stack using React, TypeScript, , NestJS, PostgreSQL, AWS
  • Take end-to-end ownership of features including architecture, testing, deployment and iteration
  • Work closely with product and design to align technical execution with user needs
  • Write clean, maintainable, well-tested code and champion engineering best practices
  • Improve developer workflows and tooling (GitHub, GitHub Actions, Slack, Linear, Sentry, SolarWinds) to keep the team fast and productive
  • Contribute to infrastructure (Docker, AWS ECS, RDS, S3, SES, CloudFront, CDK) and ensure reliability at scale
  • Share knowledge, mentor peers and foster a collaborative, learning-oriented engineering culture.

What We Are Looking For

  • Strong experience delivering fullstack applications in fast-moving product environments
  • Deep expertise in React, TypeScript, , NestJS, PostgreSQL and experience running services on AWS
  • Understanding of modern infrastructure: Docker, AWS ECS/RDS/S3/SES/CloudFront/CDK
  • Experience with developer and collaboration tools: GitHub, GitHub Actions, Slack, Linear, Sentry, SolarWinds
  • Excellent communicator and team player, open to learning and sharing knowledge with others
  • Sense of ownership and pride in your work, motivated by outcomes rather than tasks.

Nice To Have

  • Startup or scale-up experience in small, fast-moving teams
  • Familiarity with CI/CD, observability and scaling infrastructure
  • A track record of improving performance, code quality or developer experience.

Why Join Zelt

  • Get equity in a high-growth startup backed by the investors of Notion, Spotify and Airbnb
  • Work with a diverse, international team on a product that delivers real value to customers every day
  • Direct ownership and visible impact from day one, your code will power systems that thousands of people use daily
  • A culture that values technical excellence, curiosity and continuous learning
  • Competitive compensation, benefits including health insurance, and the opportunity to join at the right time with product-market fit already achieved and big technical challenges ahead.

Your work at Zelt will not disappear into the background, it will help define how modern companies run their people operations.

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