Full Stack Founding Engineer
Description For Full Stack Founding Engineer
QFEX is revolutionizing traditional financial markets with their 24/7 exchange platform where reliability and performance are paramount. As a Founding Full-Stack Engineer, you'll be at the forefront of building a system where downtime isn't an option and milliseconds matter.
The role combines architectural challenges with hands-on development, requiring expertise in both backend and frontend technologies. You'll be working with a modern tech stack including Python & Rust micro-services, React, TypeScript, and Kubernetes, while having the opportunity to shape technical decisions and team culture.
Key responsibilities include architecting end-to-end user journeys, designing fault-tolerant services, establishing DevOps practices, and contributing to technical direction. The ideal candidate brings 3+ years of production system experience, proficiency in multiple programming languages, and a holistic understanding of full-stack development.
Founded by former Quants and Engineers from Citadel & Tower Research, QFEX aims to revolutionize the $100 billion exchange and clearing industry. The company offers a competitive package including founding-team equity, London-based salary (£80k – £110k), comprehensive benefits, and a collaborative work environment in their central London office.
The position requires UK work authorization and on-site presence, reflecting QFEX's commitment to building a tight-knit, high-performance team. Experience in fintech, low-latency systems, or infrastructure would be advantageous, but they value potential and diverse perspectives over perfect resume matches.
This is an exceptional opportunity for a skilled engineer who wants to help build a next-generation financial exchange from the ground up, working directly with experienced founders in a fast-paced, autonomous environment where impact is immediately visible.
Responsibilities For Full Stack Founding Engineer
- Architect, code, and ship end-to-end user journeys across web and mobile—from API to pixel
- Design fault-tolerant, low-latency services; write load tests and chaos suites
- Set up CI/CD, IaC, monitoring, and on-call processes
- Evaluate tools, set coding standards, and guide architectural decisions
- Help interview the next engineers, share knowledge, and shape team culture
Requirements For Full Stack Founding Engineer
- 3+ years building and running production systems (preferably high-traffic or real-time)
- Fluent in at least two of: Python, Rust, TypeScript—and eager to learn the rest
- Can move up and down the stack—database schema in the morning, React hooks after lunch
- Believe tests, metrics, and graceful degradation are non-negotiable
- Thrive in small, on-site teams where decisions are made in minutes, not weeks
- Hold UK work authorisation
- Can work Monday–Friday from central London office
Benefits For Full Stack Founding Engineer
- Founding-team equity plus competitive London salary (£80k – £110k base, DOE)
- Brand-new office near Liverpool Street with top-tier hardware, stocked kitchen, and standing desks
- 25 days holiday + bank holidays (untracked sick leave—health first)
- Private healthcare & wellness stipend
- Annual off-site and a learning budget to attend conferences or buy courses/books
- Zero bureaucracy: small team, real autonomy, visible impact
