The Vault by Tría Finance is a Swiss and EU-regulated fintech group delivering institutional-grade digital asset infrastructure and services. Bringing together a software vendor and a licensed Crypto Asset Service Provider (CASP), The Vault combines deep domain expertise with a strong foundation of transparency, security, and regulatory compliance. We develop and operate a comprehensive suite of crypto-native solutions, powered by proprietary technology, enabling institutions to execute digital asset strategies across both custodial and non-custodial models. We're building a security-first platform for digital asset operations. Our product is API-driven, highly auditable, and engineered for reliability. We're looking for a Senior Full-Stack Engineer who can own features end-to-end — from clean domain modeling in Go or Node.js to a polished, crisp React UI. Responsibilities: • Build end-to-end product features across Go and Node.js/Express backends and React frontend • AI-assisted development: use Cursor/Copilot/ClaudeCode (or similar) daily to accelerate delivery, refactoring, and test generation—while verifying outputs and keeping code clean • Design backend services using DDD patterns (bounded contexts, aggregates, domain events), clean layering, and pragmatic architecture • Implement data models and migrations across PostgreSQL and MongoDB, using GORM, Mongoose, or raw queries where appropriate • Build and maintain REST APIs (and webhooks/event-driven workflows where needed) in both Go and Node.js/Express • Implement frontend flows in React (TypeScript): dashboards, admin workflows, status lifecycles, audit views • Ensure correctness and observability: structured logging, metrics, tracing, and production-ready error handling • Contribute to security fundamentals: RBAC, least-privilege access, safe secrets handling, and audit trails • Own quality: unit/integration tests, contract tests, and CI pipelines Requirements Must-have • 7+ years building production systems with Go and/or the MERN stack (MongoDB, Express, React, Node.js), plus solid React experience • Strong backend fundamentals: concurrency, APIs, reliability, debugging • Hands-on with DDD (not just buzzwords): can model domains and keep boundaries clean • Strong database skills across PostgreSQL and MongoDB: schema/collection design, indexing, query tuning, migrations • Experience with GORM and/or Mongoose (or similar ORMs/ODMs) plus comfort dropping to raw SQL or aggregation pipelines when needed • Frontend proficiency in React (TypeScript preferred), including state management and form-heavy admin UIs • Good testing discipline (Go testing, Jest/Vitest, integration tests; frontend testing basics) • REQUIRED: confident daily use of AI coding tools (Cursor/Copilot/etc.) with disciplined verification and secure practices Nice to have • Event-driven patterns: outbox, retries, idempotency, background jobs • Experience with RBAC/policy engines, audit logs, fintech/compliance workflows • Docker/Kubernetes familiarity • CI/CD ownership (GitHub Actions/GitLab CI), release workflows • Experience with high-security systems (custody, payments, identity) Soft skills • Ownership mindset: deliver features end-to-end with high quality • Clear communication and ability to work across teams • Pragmatic: balances long-term design with shipping • Comfortable in ambiguity and fast iteration Benefits • Competitive salary; • Annual performance bonus; • Fully remote position — work from anywhere in the world (team operates on CET); • Paid time off, including vacation, sick leave, and public holidays; • Multiple projects within the company — the opportunity to discuss different projects during the interview and choose the one that's the best fit for you.