Senior Full-stack Engineer; Node.js​/React

Position: Senior Full-stack Engineer (Node.js / React)
Job Title :
Senior 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 Senior Full-stack Engineer to be the core technical pillar of our new  Market team . This is a hands-on technical leadership role without people management responsibilities. This role is at the very heart of our exchange, focusing on high-performance, real-time trading and liquidity systems.
In our structure, the  Manager  defines the why and what (product) and manages the who (people). As the  Senior Engineer,  you are the undisputed technical expert responsible for the deep how. You will own the architecture and execution of our  core trading engine and liquidity management systems.
Your mission is to architect, 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 also be responsible for 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
Architect the Trading Engine:  Design, build, and maintain the new high-performance services for our exchange using Node.js (Nest.js), including:
The  Orders  management system.
The  Trade matching  engine.
The core  Ledger  for recording all transactions.
Build Liquidity Systems:  Architect and implement 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:  Analyze the existing legacy codebase for trading and liquidity. Design and execute a clear migration strategy to the new architecture with zero downtime.
Technical Leadership:  Act as the primary technical mentor for other engineers on the team, performing in-depth code reviews and solving the most complex challenges related to performance, concurrency, and reliability.
Performance Tuning:  Obsess over performance. You will be responsible for profiling, optimizing, and ensuring low-latency communication across our trading systems (e.g., via Rabbit

MQ, Redis, and Web Sockets).

What We're Looking For

Experience:

5+ years of professional experience in full-stack development.
Domain Expertise:
Direct experience in Fin Tech, high-frequency trading (HFT), or building real-time exchange/brokerage systems is a hard requirement.  You must have experience building high-performance, low-latency, and highly reliable systems.
Back-end Expertise:  Expert-level knowledge of  Type Script  and  Node.js .
Real-time Systems:  Deep experience with  Rabbit

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

Skills:

Deep experience with relational…