Senior Software Developer (Backend, Frontend, Big Data & Cloud)

About the role

Sia, a global management consulting group founded in 1999, is looking for a Senior Software Developer in Brussels. You will work on transformation projects for its clients in software development, modelling and digital transformation environments, with a strong business perspective. The role combines back-end development, front-end contribution, DevOps and big data and cloud work.

Key responsibilities

• Design, develop and maintain robust, scalable and secure applications, APIs and system integrations with Python and TypeScript/Node.js (Java a nice to have), using Flask, Django, Spring Boot and Express, and data layers with SQLAlchemy, Marshmallow and Alembic
• Work with REST and GraphQL APIs and integration patterns across distributed systems
• Support user-facing features and interface development with TypeScript, React, Angular and Vue.js, and tooling such as Vite, Next.js and Nuxt.js
• Contribute to CI/CD pipelines, containerized deployments and releases in GitLab CI/CD, Docker and Kubernetes, with attention to code quality, testing, observability and maintainability
• Apply algorithmic knowledge to large-scale data processing with Apache Spark, Kafka, Airflow, Flink and Hadoop, and help design, deploy and operate cloud-native data platforms on Azure, AWS and GCP, including Databricks
• Help shape Sia's software, data, cloud and AI offerings and contribute to commercial initiatives by translating business needs into solution architectures
• Take up team leadership roles early and connect with colleagues at all levels

Required profile

• Master's degree
• 3-6 years of relevant experience
• Analytical, fast learner, communicative, flexible and entrepreneurial
• Strong interest in data and AI, with excellent English, Dutch and French; fluent German is a plus

Required skills

• Python, TypeScript, Node.js, Java (nice to have)
• Flask, Django, Spring Boot, Express, SQLAlchemy, Marshmallow, Alembic
• REST, GraphQL
• TypeScript, React, Angular, Vue.js, Vite, Next.js, Nuxt.js
• GitLab CI/CD, Docker, Kubernetes
• Apache Spark, Kafka, Airflow, Flink, Hadoop
• Azure, AWS, GCP, Databricks

What we offer

• International company committed to diversity, inclusion, well-being and corporate social responsibility
• Personal development plan with regular follow-up and training opportunities
• Competitive salary with advantages such as mobility budget or company car, hospital insurance and performance-related bonus