Senior Full-Stack Engineer — Remote, AI-assisted Fintech

THE VAULT; Lisboa; Remote; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Fully remote (worldwide)

Annual performance bonus

Paid time off including vacation and S

Competitive salary

Job summary

The Vault by Tría Finance is seeking aSenior Full-Stack Engineer to own features end-to-end across Go/Node.js backends and a React frontend. You will design, implement, and ship scalable services in a security-focused fintech environment, collaborating with product and security teams.

Responsibilities include building end-to-end product features, applying DDD patterns, managing databases like PostgreSQL and MongoDB, and ensuring observability, testing, and CI.

Qualifications

• 7+ years building production systems with Go and MERN stack, plus solid React experience.
• Strong backend fundamentals: concurrency, APIs, reliability, debugging.
• Hands-on with DDD to model domains and keep boundaries clean.
• Strong PostgreSQL and MongoDB design, indexing, and migrations.
• Experience with GORM and/or Mongoose; comfortable with raw SQL when needed.
• Frontend proficiency in React (TypeScript preferred) with state management.
• Good testing discipline including Go/Jest/Vitest; frontend testing basics.
• REQUIRED: confident daily use of AI coding tools with disciplined verification.

Responsibilities

• Build end-to-end product features across Go and Node.js/Express backends and React frontend
• AI-assisted development: use Cursor/Copilot/ClaudeCode daily to accelerate delivery, refactoring, and test generation—while verifying outputs and keeping code clean
• Design backend services using DDD patterns, clean layering, and pragmatic architecture
• Implement data models and migrations across PostgreSQL and MongoDB, using GORM, Mongoose, or raw queries
• Build and maintain REST APIs (and webhooks/event-driven workflows) in 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, 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

Skills

Go

Node.js

React

MongoDB

PostgreSQL

DDD

REST APIs

TypeScript

AI coding tools

Tools

GORM

Mongoose

Express

Docker

Kubernetes

Job description

The Vault by Tría Finance is seeking aSenior Full-Stack Engineer to own features end-to-end across Go/Node.js backends and a React frontend. You will design, implement, and ship scalable services in a security-focused fintech environment, collaborating with product and security teams.

Responsibilities include building end-to-end product features, applying DDD patterns, managing databases like PostgreSQL and MongoDB, and ensuring observability, testing, and CI.