Full Stack Engineer (JavaScript) – Early-Stage Tech Start-Up

Urban Digital Recruitment Ltd; Remote; GBP 90,000; Full time

Job summary

A tech-focused recruitment agency is seeking a senior Full Stack Engineer (JavaScript) for an early-stage tech start-up in the UK. This position offers an opportunity to work remotely with flexible hours and a competitive salary of around £90k plus benefits. The ideal candidate should have over 5 years of full-stack experience, be backend-leaning with strong skills in JavaScript and Node.js, and thrive in a fast-paced, autonomous environment. This role includes high ownership of products, driving significant impact in the fintech space.

Benefits

Pension

Private Healthcare

Death-in-Service

Equity Potential

Qualifications

• 5+ years full-stack experience with strong JavaScript/TypeScript depth.
• Backend-leaning with deep Node.js and API experience.
• Experience in early-stage start-ups or lean engineering teams.

Responsibilities

• Full Stack Development: Ship features across backend and front end.
• Integrations: Build and maintain mission-critical 3rd-party integrations.
• Quality Without a Safety Net: Write reliable, maintainable, testable code.

Skills

JavaScript

Node.js

PostgreSQL

React

TypeScript

Firestore

GCP

Job description

Full Stack Engineer (JavaScript) – Early-Stage Tech Start-Up

Remote (UK-based only) | Flexible Hours

c£90k + Benefits (Pension, Private Healthcare, Death-in-Service, Equity Potential)

The Role

We’re looking for a senior, backend-leaning Full Stack Engineer who thrives in the controlled chaos of a true early-stage start-up, the kind where there’s no QA team, no DevOps team, no predefined frameworks, no hand‑holding, and everything technical ultimately sits with engineering.

This is a role for someone who is genuinely a jack of all trades, comfortable wearing multiple hats across backend, front end, infrastructure, integration engineering, and delivering production-quality work without layers of support.

The company is building fintech‑grade technology to disrupt the hospitality industry: powerful integrations, real‑time customer personalisation, and seamless operational flows.

If you want autonomy, impact, and variety, and you’ve had to solve real engineering problems in lean environments, this is it.

What You’ll Do

• Full Stack Development: Ship features across backend (majority) and front end (React / Next.js).
• Hands‑On Problem Solving: Own complex engineering challenges end‑to‑end in an environment with limited process and support.
• Integrations: Build and maintain mission‑critical 3rd‑party integrations and data flows.
• Infrastructure Ownership: Handle deployment, debugging, monitoring, release processes (no DevOps team in place).
• Quality Without a Safety Net: Write reliable, maintainable, testable code— you are effectively your own QA.
• Database Mastery: Optimise Firestore and PostgreSQL performance, queries, structures.
• Technical Initiative: Identify gaps, propose solutions, and implement improvements without being asked.
• Innovation: Research, evaluate, and introduce new tools, frameworks, or approaches.
• Product Impact: Your work hits production quickly and directly shapes the user experience.

Why This Role Is Different

• No padding, no layers, no micromanagement – you are trusted to deliver.
• Greenfield + problem‑solving heavy – no frameworks or legacy safety nets.
• High ownership – you will directly influence architecture, tooling, processes, reliability, and scale.
• A place for doers – perfect for someone who loves autonomy and figuring things out.
• Fintech‑grade engineering – powering real‑time payments, bill syncs, integrations, and personalised experiences.

About You

You will be a great fit if you :

• Have 5+ years full‑stack experience, with strong JavaScript / TypeScript depth.
• Are backend‑leaning, with deep Node.js and API experience.
• Have previously worked in early‑stage start‑ups or very lean engineering teams.
• Have extensive evidence of being a hands‑on individual contributor in complex codebases.
• Can operate without QA, DevOps, or heavy process—because you’ve done it before.
• Are comfortable taking responsibility for deployments, testing, reliability, debugging, and performance.
• Have strong experience with:
  • Node.js, Express.js
  • React / Next.js (or similar)
  • PostgreSQL / SQL
  • Firestore
  • GCP & Firebase
• Thrive in fast‑paced, ambiguous, high‑ownership environments.
• Bonus: Experience in hospitality tech or fintech.

Tech Stack

• Languages & Frameworks: Node.js, Express.js, JavaScript, TypeScript, React, Next.js
• Styling: Tailwind CSS
• Databases: Firestore, PostgreSQL / SQL
• Infrastructure: Google Cloud Platform (GCP), Firebase
• Bonus: Experience building or integrating APIs at scale

About the Company

This start‑up is reinventing how hospitality businesses connect with their customers, combining fintech‑level reliability, smart integrations, real‑time data, and delightful user experiences. They’re building tools that simplify operations and empower truly personalised service in an industry that needs modernisation.