Senior full stack JavaScript Engineer (Node.js / React) - banking sector
Location: Belgium (Hybrid model)
Contract type: Freelance / Contract
Context
Our client is a fast-growing digital bank undergoing a major transformation of its IT landscape. The organization is modernizing its legacy systems into a MicroServices architecture hosted on AWS, with a strong focus on Domain-Driven Design (DDD).
The development organization is structured into autonomous feature teams, each aligned with a specific business domain. These teams promote ownership, collaboration, and innovation, offering you the opportunity to make a real impact in a human-sized environment.
Your role
As a Senior Full Stack JavaScript Engineer, you will play a key role in designing and delivering high-quality digital banking solutions.
You are someone who:
Thrives in a collaborative Agile environment, while being capable of working autonomously
Translates complex business requirements into scalable and elegant technical solutions
Balances engineering discipline with pragmatism
Has a strong focus on code quality, performance, and security
Is eager to continuously learn and grow, both technically and within the banking domain
You take ownership of your work, actively contribute ideas, and are open to feedback and continuous improvement.
Key responsibilities
Design, develop, and maintain scalable full stack applications within a MicroServices ecosystem
Translate business requirements into technical specifications and user stories
Develop high-quality frontend and backend solutions using modern JavaScript technologies
Build and maintain secure and performant APIs (REST and/or gRPC)
Collaborate closely with Product Owners, Scrum Masters, and other developers
Contribute to Agile ceremonies (daily stand-up, sprint planning, retrospectives)
Ensure code quality through testing (unit, integration, E2E)
Participate in CI/CD processes and deployments
Contribute to architectural discussions and technical improvements
Technical skills
Frontend:
Strong experience with: React.JS (with styled-components)
React Native
Good understanding of: Micro-frontend architecture
Backend:
Strong expertise in:
Node.js with TypeScript
Experience with:
API design (REST and/or gRPC)
OpenAPI / Swagger
Knowledge of ORM tools (TypeORM or modern alternatives) is a plus
DevOps & Cloud:
Experience with:
CI/CD pipelines (GitLab preferred)
Familiarity with:
AWS services (S3, DynamoDB, RDS, EKS, etc.)
Methodology:
Proven experience working in: Agile / Scrum environments
Strong ability to:
Translate business needs into clear user stories
Collaborate effectively within cross-functional teams
Required qualifications
Minimum 5 years of experience in full stack JavaScript development
Strong analytical and problem-solving skills
Fluent in English
Nice-to-have:
Knowledge of banking or financial services
Proficiency in Dutch or French
Experience with:
TerraForm / Infrastructure as Code
C# .NET
GraphQL
Exposure to other backend technologies (e.g., PHP)
Soft skills:
Team player with strong communication skills
Proactive and solution-oriented mindset
Strong sense of ownership and responsibility
Passion for technology and innovation
Brussels
Start date : ASAP
Contract 6 months with long term assignment and so extensions
50% hybrid system
