Senior Software Developer

Sia Partners · Brussels, Brussels, Belgium

Location
Brussels
Job Type
Full-time
Posted
May 30, 2026

Job Description

Job description

As a Senior Software Developer with strong back-end capabilities and a good understanding of front-end development, you will be involved in transformation projects at our clients. You will execute project assignments in software development, modelling and digital transformation environments, with a good deal of business perspective: 


  • Back-end development: designing, developing and maintaining robust, scalable and secure applications, APIs and system integrations using Python and TypeScript/Node.js (Java as a nice to have), with mainstream frameworks such as Flask, Django, Spring Boot and Express; building data and service layers with tools such as SQLAlchemy, Marshmallow and Alembic; and working with API architectures and integration patterns across distributed systems, including REST and GraphQL 



  • Front-end contribution: supporting the implementation of user-facing features and collaborating on interface dev...

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