Full-Stack Engineer (React / Next.js / Nest.js) — Crypto Options Trading Platform

Madfish; Remote; GBP 50,000 - 70,000; Full time

Job summary

A leading crypto trading platform in the United Kingdom is seeking a strong middle full-stack engineer to take ownership of building user-facing modules with React/Next.js and maintaining backend services with Nest.js. Join a remote-friendly team where you will work independently on a real-time trading product and contribute to architectural decisions. The ideal candidate will have strong skills in both frontend and backend development, with experience in SQL and real-time updates. This is a unique opportunity in a fast-paced crypto-native environment.

Benefits

Remote-friendly

Flexible hours

Qualifications

• 3+ years experience building full-stack client-facing applications.
• Very confident with both frontend and backend development.
• Strong experience with React + Next.js (SSR, SEO, routing).
• Experience developing backend APIs with Nest.js / Node.js.
• Solid experience with SQL (PostgreSQL) — schemas, migrations, queries.

Responsibilities

• Build user-facing modules in React / Next.js.
• Implement and maintain backend services using Nest.js.
• Create secure, scalable backend APIs.
• Deploy, monitor, and maintain the system.

Skills

Frontend development

Backend development

React

Next.js

Nest.js

WebSockets

SQL (PostgreSQL)

API development

Linux

Docker

Nginx

Job description

We’re building a next-generation crypto options trading platform — and we’re looking for a strong middle full-stack engineer who is highly confident on both the frontend and backend. You’ll be working fairly independently, taking ownership of features end-to-end — real-time frontend UI, backend APIs, deployment, monitoring, and maintenance.

You’ll be working closely with the product lead & CTO to build a high-performance trading interface.

What You’ll Work On

• Build user-facing modules in React / Next.js (SSR routing + performance sensitive views)
• Implement and maintain backend services using Nest.js
• Implement real-time updates (WebSockets)
• Create secure, scalable backend APIs
• Work with SQL database (PostgreSQL)
• Implement auth flows (including OAuth)
• Deploy, monitor, and maintain the system (you own your code)
• Contribute to product direction and UX decisions

Requirements

• 3+ years experience building full-stack client-facing applications
• Very confident with both frontend and backend development
• Strong experience with React + Next.js (SSR, SEO, routing, frontend perf)
• Experience developing backend APIs with Nest.js / Node.js
• Working confidently with WebSockets and real-time updates
• Strong understanding of backend security and API best practices
• Solid experience with SQL (PostgreSQL) — schemas, migrations, queries
• Experience with Linux, Docker, Nginx (basic practical usage)
• Able to host, run, and monitor your own services (no hand-holding)
• Experience with authentication/authorization flows (OAuth preferred)
• Familiar working in an environment without a dedicated DevOps engineer
• Independent problem solving / ownership mindset

Nice To Have

• Experience in crypto / trading / options
• Experience with AWS or Google Cloud
• Web3 experience (wallet auth, signing, etc.)
• Good product vision — ability to reason about UX and user flow

Why this role is interesting

• You’ll join early and influence platform architecture and UX
• You’ll work on a real-time fintech product
• Zero bureaucracy, fast iteration, direct collaboration with the management

Remote-friendly | Flexible hours | Crypto-native environment

If you’re interested — send your GitHub, LinkedIn, portfolio, and a short note about your most complex full-stack project.