Senior Java Backend Engineer - High-Scale Data Platform

Every day, billions of financial transactions move through the global banking system. We build the platform that makes that data searchable in real time - helping banks detect fraud, investigate issues, and stay compliant. This is high-volume, real-time backend engineering., We're hiring a Senior Java Backend Engineer to join our core platform team in Mechelen. You'll work in a small, autonomous team building the engine that ingests, indexes, and searches massive volumes of transaction data in real time. This is hands-on engineering at scale - designing systems, solving performance challenges, and shaping how the platform evolves. What You'll Work On

• Building high-performance backend services in Java (11+)
• Real-time ingestion and indexing of large-scale data
• Search capabilities using Elasticsearch / Lucene
• Performance optimisation and scalability
• Technical design and architecture decisions
• Writing clean, well-tested production code

• Strong Java backend experience in production systems
• Experience with high-throughput / distributed systems
• Solid software design fundamentals
• Comfortable owning features end-to-end
• Pragmatic, collaborative mindset

Nice to have:

• Elasticsearch / Lucene
• Real-time data systems
• Fintech / regulated environments

The Environment

• Hybrid: 3 days in Mechelen office (opposite the station), 2 from home
• International, English-speaking team
• French or Dutch helpful for daily life

If you're a strong backend engineer who enjoys solving hard problems at scale - we'd like to hear from you.