Full-stack Engineer; Node.js​/React

Position: Full-stack Engineer (Node.js / React)
Job Title  :
Full-stack Engineer (Node.js / React)
Team  :
Market (Trading & Liquidity)
Location  :
Onsite - Ticino, Switzerland

About Us   We are a new, well-funded R&D company with a clear vision: to build the future of cryptocurrency infrastructure. Our ambition is to become the #1 cryptocurrency platform in the EU by market share within the next three years.
We are starting with a proven, operational crypto platform and are now assembling a world-class team to evolve it to the next level. Our core products include:
Golden Ratio Exchange:
An advanced, security-first exchange for professional traders.
GRX Pay:
A seamless payment gateway that allows merchants to accept crypto and receive fiat.

This is a rare opportunity to join a fresh company culture from day one, while working on the exciting technical challenges of a mature product. We are building our foundational R&D hub in   Ticino, Switzerland  , and are looking for core team members to build this new culture with us.

The Role   We are looking for a skilled Full-stack Engineer to be a key member of our new   Market team  . This is a hands-on builder role at the very heart of our exchange, focusing on high-performance, real-time trading and liquidity systems.
You will work closely with the Senior Engineer and Manager to build and maintain the low-latency microservices for our exchange, as well as the sophisticated systems that manage our internal and external market liquidity. You will be a key contributor to re-architecting our legacy trading systems and migrating them to a modern, scalable, and reliable architecture.
This is a full-time, onsite role at our new R&D hub in Ticino, Switzerland.
Given the critical, high-performance nature of the trading engine, we believe co-location is essential for rapid innovation and building a resilient engineering culture.

What You'll Do    Build and Maintain:
Actively contribute to building and maintaining the high-performance services for our exchange using Node.js, including:
The   Orders   management system.
The   Trade matching   engine.
The core   Ledger   for recording all transactions.
Contribute to Liquidity Systems:
Help build and maintain the systems that manage our platform's liquidity, including:
Automated balancing   of internal funds.
Automated external balancing   via integrations with other platforms (e.g., Kraken).
Manual tools and reporting for the liquidity team.
Full-Stack Development:
Build and maintain the user-facing React components for our trading products, such as:
"Trading view with candles"  .
The   “Quick convert”   feature.
The   “Crypto Onramp”   (fiat-to-crypto) journey.
Legacy Migration:
Support the Senior Engineer in analyzing the existing legacy codebase for trading and liquidity and execute the migration strategy.
Uphold Standards:
Write high-quality, maintainable, and well-tested code, following the best practices for performance and reliability set by the team.
Performance Tuning:
Help profile, optimize, and ensure low-latency communication across our trading systems (e.g., via Rabbit

MQ, Redis, and Web Sockets).

What We're Looking For

Experience:

3+ years of professional experience in full-stack development.
Domain Expertise:
Experience in Fin Tech, trading, or building real-time systems is strongly preferred.
You must have a demonstrable interest in high-performance, low-latency systems.
Back-end Expertise:
Strong proficiency in   Type Script   and   Node.js  .

Experience with   Nest.js   is a major plus.
Real-time Systems:
Strong experience with   Rabbit

MQ   (or similar message brokers) and   Redis  . You must be comfortable with asynchronous, event-driven architecture.
Database

Skills:

Solid experience with relational databases (  Postgre

SQL  ) and writing efficient queries.
Front-end Proficiency:
Good experience with   React.js   and experience with real-time front-ends (e.g.,   Web Sockets  ).
Legacy Systems

Experience:

Experience working with and refactoring existing codebases. You are comfortable diving into code you didn't write.

Location:

Willingness to work   onsite in Ticino, Switzerland  .
Team Player:
A collaborative attitude and a desire to learn and grow with the team.

Bonus Points    Direct experience building a cryptocurrency exchange matching engine.

Experience with real-time data visualization libraries (e.g., Trading View, D3.js).
Experience integrating with third-party exchange APIs (e.g., Kraken, Binance).

What We Offer    High-Impact Role:
An opportunity to make a huge impact by building our core trading and liquidity engine.
Clear Ambition:
The chance to join a company with a clear goal of becoming the #1 crypto platform in the EU.
Clear Career Path:
A role with a clear path for growth in technical excellence, with mentorship from senior engineers.
Onsite Culture:
A fantastic opportunity to build a new R&D culture from the ground up in our modern Ticino, Switzerland office.
Greenfield Culture, Brownfield Code:
A rare chance to join a new company culture with no baggage, while solving the interesting technical…