Senior Full Stack JS Engineer (with Python experience)

NineTwoThree AI Studio
Municipality of Madrid, Spain
5 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Senior

Job location

Remote
Municipality of Madrid, Spain

Tech stack

JavaScript
API
Artificial Intelligence
Amazon Web Services (AWS)
Amazon Web Services (AWS)
Amazon Web Services (AWS)
Business Logic
Django
Python
PostgreSQL
Node.js
OAuth
Redis
Swagger
Socket
TypeScript
WebSocket
Openapi
Real Time Systems
React
Backend
Amazon Web Services (AWS)
Pytest
WebPack
Material Design
Real Time Data
Codebase
Celery
Front End Software Development
React
REST
DocuSign
Docker
Microservices

Job description

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: It is a comprehensive financial services platform built for an established insurance and financial services company. The platform handles:

  • 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:

Work on a mature financial platform with real business requirements:

  • 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

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

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