Full Stack Engineer

Dex; Greater London; On-site; GBP 100,000 - 140,000; Full time

Job summary

Dex's trusted partner company is seeking a senior full-stack engineer to build a core institutional client platform from scratch, handling market data, low-latency WebSocket streams, and robust backend APIs.

You will own features end-to-end, design scalable services, and ship real-time web applications using Go or Python on the backend and TypeScript/React on the frontend.

Qualifications

• 5+ years of full-stack software engineering experience shipping production systems.
• Strong backend fundamentals in Go or Python, with REST and WebSocket APIs.
• Deep proficiency with TypeScript, React, and real-time streaming data in the browser.
• Experience owning relational schema design and cloud infrastructure on AWS.

Responsibilities

• Architect and ship a greenfield client platform end-to-end across the entire customer lifecycle.
• Design and implement resilient backend services and APIs in Go or Python for high-frequency data and live order flow.
• Build high-density, real-time web applications in TypeScript and React rendering WebSocket streams in the browser.
• Design robust relational schemas, optimize queries, and enforce security around authentication and data isolation.
• Own your code in production, manage AWS, containers, CI/CD pipelines, and monitoring.

Skills

Go

Python

TypeScript

React

WebSocket

Tools

AWS

PostgreSQL

REST API

WebSocket

Job description

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.

Dex is an AI recruiter agent that helps you run your job search. Tell Dex your stack, seniority, and what you want to build. We will manage your applications and surface other opportunities that are a fit.

The role

A leading algorithmic market maker providing core liquidity across digital asset markets globally, operating at institutional scale across centralised and decentralised venues. The firm pairs high-frequency trading performance standards with the autonomy and deployment velocity of a tight, engineering-first team.

You will join the product engineering team to build a core institutional client platform from scratch, alongside internal trading tools and client portals. This is complete vertical ownership - modelling market data, writing performant Go or Python services, and rendering low-latency WebSocket streams in React - not skinning templates or gluing together third-party SaaS tools.

The work

• Architect and ship a greenfield client platform from the ground up, owning features end to end across the entire customer lifecycle.
• Design and implement resilient backend services and APIs in Go or Python, handling high-frequency market data and live order flow.
• Build high-density, real-time web applications in TypeScript and React that cleanly handle WebSocket data streaming directly to the browser.
• Design robust relational schemas, optimize complex queries, and enforce institutional security standards around authentication, authorization, and data isolation.
• Own your code in production, managing cloud infrastructure on AWS, containerized deployments, CI/CD pipelines, and active monitoring.

What You Bring

• 5+ years of full-stack software engineering experience shipping production systems across both backend services and modern frontends.
• Strong backend fundamentals in Go or Python, with hands‑on experience designing high-throughput REST and WebSocket APIs.
• Deep proficiency with TypeScript, React, and rendering real-time streaming data cleanly in the browser.
• Demonstrated ownership of relational schema design, query optimization, and production cloud infrastructure on AWS or equivalent major clouds.

Why apply through Dex

Engineering seats at tier‑one market makers are notoriously hard to access without getting lost in third‑party recruiter noise or generic talent pipelines. Applying through Dex skips the cold queue, matches you directly against the team's technical bar, and gives you an unvarnished briefing on the stack and interview roadmap before you speak with them.

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