Senior Full-Stack Engineer

Job Title: Senior Full-stack Engineer (Node.js / React)Team: Assets (Crypto & Fiat Management)Location: Onsite - Ticino, SwitzerlandAbout 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 inTicino, 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 newAssets team. This is a hands-on technical leadership role without people management responsibilities. This is one of the most critical and complex roles in our company, responsible for the entire lifecycle of customer funds.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 all systems that manage crypto and fiat assets.Your mission is to architect, build, and maintain the microservices for blockchain infrastructure, fiat payment processing, and user fund management. You will work across the entire stack (Node.js, React, PostgreSQL) to build highly secure, reliable, and compliant systems. You will also be responsible for re-architecting our legacy asset management systems and migrating them to a modern, service-oriented architecture.This is a full-time, onsite role at our new R&D hub in Ticino, Switzerland.Given the high-security nature of the Assets team, we believe co-location is essential for building a robust, trust-based engineering culture.What You'll DoArchitect and Build:Design, build, and maintain the new "Assets" microservices using Node.js (Nest.js) and PostgreSQL. These services are responsible for:Blockchain Infrastructure:Transaction broadcasting, fund consolidation, and wallet management.Fiat Infrastructure:Integrating with banks and payment providers for fiat transaction processing.Core Asset Functions:The complete functionality for user deposits, withdrawals, and internal transfers to other GRX users.Fee Systems:The foundational functionality for GRX fees.Full-Stack Development:Build the user-facing front-end components (in React) for the "Assets page," "Dashboard page," and "Statement reports" for tax purposes.Legacy Migration:Analyze the existing legacy codebase for asset and wallet management. 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 architectural challenges.Security & Compliance:Work closely with the Manager to ensure all systems are fully compliant with MiCA, "Travel Rule" regulations, and principles of asset safeguarding and segregation.Maintain Legacy Systems:Analyze and maintain existing systems, such as "GRX Codes," while evaluating their compliance and long-term utility.What We're Looking ForExperience:5+ years of professional experience in full-stack development.Domain Expertise:Direct experience in FinTech, banking, or cryptocurrency is a hard requirement for this role.You must have experience building systems that move or manage money.Back-end Expertise:Expert-level knowledge ofTypeScriptandNode.js.Front-end Proficiency:Strong proficiency inReact.jsand modern front-end practices.Database Skills:Deep experience with relational databases (PostgreSQL).Blockchain Knowledge:A strong, practical understanding of blockchain principles, wallets (hot/cold), and transaction lifecycles.Legacy Systems Experience:Demonstrable experience working with and refactoring large, existing codebases.Architectural Skills:Strong understanding of microservices architecture, secure API design, and event-driven patterns.Location:Willingness to workonsite in Ticino, Switzerland.Mentorship:A passion for mentoring other engineers and raising the technical bar for the entire team.Bonus PointsDirect experience running or interacting with blockchain nodes (e.g., Bitcoin, Ethereum).Experience with fiat payment processor integrations (e.g., Stripe, Braintree, or bank APIs).Experience with message brokers (RabbitMQ) andRedis.What We OfferHigh-Impact Role:A unique opportunity to be the founding technical expert for our core assets 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.