Senior Full-Stack Engineer

Job Title : Senior Full-stack Engineer (Node.js / React)Team : Market (Trading & Liquidity)Location : Onsite - Ticino, Switzerland About UsWe 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 RoleWe 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 databases ( Postgre SQL ) and optimizing complex queries for performance. Front-end Proficiency: Strong proficiency in React.js and experience with real-time front-ends (e.g., Web Sockets ). Legacy Systems Experience: Demonstrable experience working with and refactoring large, existing codebases. Location: Willingness to work onsite in Ticino, Switzerland . Relocation assistance is available for exceptional candidates. Mentorship: A passion for mentoring other engineers and raising the technical bar for the entire team. Bonus PointsDirect 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: A unique opportunity to be the founding technical expert for 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 focused purely on technical excellence and architecture, without the burden of people management. 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 challenges of a mature product.