Senior Fullstack Engineer

Story Terrace Inc.; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading technology firm in the UK is seeking a Senior Fullstack Engineer to design and maintain scalable applications using React, Node.js, and AWS. You will own features from architecture to deployment in a collaborative environment, directly impacting customer operations. Ideal candidates have strong fullstack experience, a passion for engineering excellence, and a desire to work in a fast-moving startup culture, alongside competitive compensation and benefits.

Benefits

Equity in high-growth startup

Health insurance

Competitive compensation

Culture that values technical excellence

Qualifications

• Strong experience delivering fullstack applications in fast-moving product environments.
• Deep expertise in React, TypeScript, Node.js, NestJS, PostgreSQL and experience running services on AWS.
• Understanding of modern infrastructure: Docker, AWS ECS/RDS/S3/SES/CloudFront/CDK.

Responsibilities

• Design, build and maintain scalable applications across the stack.
• Take end-to-end ownership of features including architecture, testing, deployment and iteration.
• Improve developer workflows and tooling to keep the team fast and productive.

Skills

React

TypeScript

Node.js

NestJS

PostgreSQL

AWS

Docker

GitHub

Tools

GitHub Actions

Slack

Sentry

SolarWinds

Job description

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, Node.js, 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, Node.js, 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.