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