Senior Full-Stack Engineer

As a Senior Full-Stack Engineer at THE VAULT, you'll own product features end-to-end, from clean domain modeling in Go or Node.js to a polished React UI. You'll join a Swiss and EU-regulated fintech group building security-first, API-driven digital asset infrastructure for institutions. Your work spans custodial and non-custodial crypto operations, underpinned by proprietary technology and strong regulatory compliance.

What you'll do

• Build end-to-end product features across Go and Node.js/Express backends and React frontend
• Use AI-assisted development tools like Cursor, Copilot, or ClaudeCode daily to accelerate delivery, refactoring, and test generation, while verifying outputs and keeping code clean
• Design backend services using DDD patterns such as bounded contexts, aggregates, and domain events with 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, webhooks, and event-driven workflows in both Go and Node.js/Express
• Implement frontend flows in React with TypeScript, including dashboards, admin workflows, status lifecycles, and audit views
• Ensure correctness and observability through structured logging, metrics, tracing, and production-ready error handling
• Contribute to security fundamentals including RBAC, least-privilege access, safe secrets handling, and audit trails
• Own quality through unit and integration tests, contract tests, and CI pipelines

What you bring

• 7+ years building production systems with Go and/or the MERN stack (MongoDB, Express, React, Node.js), with solid React experience
• Strong backend fundamentals in concurrency, APIs, reliability, and debugging
• Hands-on experience with DDD, able to model domains and keep boundaries clean
• Strong database skills across PostgreSQL and MongoDB: schema/collection design, indexing, query tuning, and 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 with TypeScript preferred, including state management and form-heavy admin UIs
• Good testing discipline with Go testing, Jest/Vitest, and integration tests, plus frontend testing basics
• Confident daily use of AI coding tools such as Cursor, Copilot, or similar, with disciplined verification and secure practices

Nice to have

• Event-driven patterns such as outbox, retries, idempotency, and background jobs
• Experience with RBAC/policy engines, audit logs, and fintech/compliance workflows
• Docker/Kubernetes familiarity
• CI/CD ownership with GitHub Actions or GitLab CI, plus release workflow experience
• Experience with high-security systems such as custody, payments, or identity

What we offer

• Competitive salary
• Annual performance bonus
• Fully remote work anywhere in the world (team operates on CET)
• Paid time off including vacation, sick leave, and public holidays
• Multiple projects within the company - discuss different projects during the interview and choose the best fit for you

About THE VAULT

THE VAULT by Tría Finance is a Swiss and EU-regulated fintech group delivering institutional-grade digital asset infrastructure and services. It combines a software vendor with a licensed Crypto Asset Service Provider (CASP), offering a comprehensive suite of crypto-native solutions powered by proprietary technology.