Senior Full Stack JS Engineer

NineTwoThree AI Studio; España; A distancia; EUR 45.000 - 75.000; Jornada completa

Descripción de la vacante

A technology firm specializing in financial services is looking for an experienced Full Stack Developer to join their fully remote team in Spain. The ideal candidate has over 5 years of experience with Node.js and Python, strong skills in React and PostgreSQL, and is able to collaborate within a stable team. This is a long-term project that offers meaningful work on a mature financial services platform.

Servicios

20 days PTO (25 after 3 years)

10 sick days and national holidays

Professional development reimbursement

Well-being budget

Formación

• 5+ years Full Stack development with Node.js/TypeScript AND Python/Django required.
• Expertise in React.js and Redux for modern frontend development.
• Strong knowledge of PostgreSQL including complex queries and transactions.

Responsabilidades

• Maintain and enhance banking and lending features, payment processing.
• Implement complex business logic for insurance products and loan origination.
• Collaborate with a stable team that knows the domain deeply.

Conocimientos

Full Stack development (Node.js, Python)

React.js

PostgreSQL

Microservices architecture

WebSockets

AWS experience

Docker

RESTful API design

Testing frameworks

Strong English communication (B2-C1)

Herramientas

Node.js

Python

React

Django

TypeScript

PostgreSQL

Descripción del empleo

Why Join Us?

🔹 100% remote | 🌎 Global team | ⏳ Full-time

Join a stable, long-term project that's been in continuous development for 5+ years. The project offers consistent, meaningful work on a mature financial services platform.

Project overview

• Insurance products (motor, life, property, major medical)
• Loan management (vehicle, personal, mortgage, commercial)
• Investment and annuity products
• Digital client services and employee benefits
• Real-time financial transactions and reporting
• AI document processing

This is a production system processing real transactions for real customers, with established business processes and regulatory compliance requirements.

Why This Position is Different

• ✅ Stable, Long-term Project : Same project for 5+ years, deep domain expertise
• ✅ Mature Codebase : Well-structured, documented, with established patterns
• ✅ Real Business Impact : Your code affects real financial transactions and client services
• ✅ Technical Variety : Polyglot architecture (Node.js + Python / Django), multiple services
• ✅ Professional Growth : Become an expert in financial services technology

What You'll Do

• Maintain and enhance banking/lending features, payment processing, and compliance workflows
• Work across our polyglot microservices architecture (Node.js/TypeScript and Python/Django)
• Implement complex business logic for insurance products, loan origination, and investment services
• Build real-time data processing systems using WebSockets and event-driven patterns
• Integrate with third-party services (DocuSign, payment gateways, banking APIs)
• Full-stack development from REST APIs to React frontends
• Ensure transaction integrity and regulatory compliance
• Collaborate with a stable team that knows the domain deeply

Requirements

Technical Requirements

• 5+ years Full Stack development with both Node.js/TypeScript AND Python/Django
• Strong React.js, Redux, and modern frontend development
• PostgreSQL expertise including complex queries, transactions, migrations
• Experience with both Knex/Objection.js (Node) and Django ORM
• Microservices architecture experience
• Real-time systems (WebSockets, Socket.io, Celery)
• AWS and Docker experience
• RESTful API design with JWT/OAuth authentication
• Testing frameworks (Jest for Node.js, pytest for Python)
• Financial or insurance systems experience is a plus
• Strong English communication (B2-C1)
• Overlap with Eastern USA timezone for meetings

Tech Stack

Backend

• Node.js/TypeScript : Koa.js, Objection.js, Knex.js
• Python : Django 4.2+, Django REST Framework, Celery
• PostgreSQL, Redis

Frontend

• React, Redux, Material-UI
• TypeScript, Vite
• Formik, Yup validation

Infrastructure

• AWS (S3, EC2, RDS)
• Docker, PM2, Gunicorn
• Socket.io, WebSockets
• DocuSign, Payment APIs
• Jest, Supertest, pytest
• Swagger/OpenAPI

Benefits

What We Offer

• Long-term stable position on established project
• 20 days PTO (25 after 3 years)
• 10 sick days, national holidays, 2 company days
• Well-being budget
• Maternity/paternity leave
• Professional development reimbursement
• Hardware as needed
• Stable, professional team environment

Process

Quick and efficient: HR screening → Technical discussion → Practical coding session → Offer

Apply now for a stable, long-term position on an established financial services platform.