Senior Full-stack Engineer

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 RabbitMQ, Redis, and WebSockets). What We're Looking For Experience: 5+ years of professional experience in full-stack development. Domain Expertise: Direct experience in FinTech, 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 TypeScript and Node.js. Real-time Systems: Deep experience with RabbitMQ (or similar message brokers) and Redis. You must understand asynchronous, event-driven architecture. Database Skills: Deep experience with relational databases (PostgreSQL) and optimizing complex queries for performance. Front-end Proficiency: Strong proficiency in React.js and experience with real-time front-ends (e.g., WebSockets). 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 Points Direct experience building a cryptocurrency exchange matching engine. Experience with real-time data visualization libraries (e.g., TradingView, 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.