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Senior Full Stack JS Engineer (with Python experience) Job Opening In Madrid – Now Hiring NineTwoThree AI Studio


Job description

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.

#J-18808-Ljbffr

Required Skill Profession

Informática Y Tecnología


  • Job Details

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Unlock Your Senior Full Potential: Insight & Career Growth Guide


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NineTwoThree AI Studio interview tips for Senior Full Stack JS Engineer (with Python experience)

Here are some tips to help you prepare for and ace your Senior Full Stack JS Engineer (with Python experience) job interview:

Before the Interview:

Research: Learn about the NineTwoThree AI Studio's mission, values, products, and the specific job requirements and get further information about

Other Openings

Practice: Prepare answers to common interview questions and rehearse using the STAR method (Situation, Task, Action, Result) to showcase your skills and experiences.

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