Senior Full-Stack Engineer

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.