Senior Java Developer - Transaction Observability

Senior Software Engineer – Transaction Observability Platform

Mechelen (Hybrid) | €80,000 – €105,000

Every day, billions of financial transactions move through the global banking system.

Fraud hides in that data. Compliance failures hide in it. Operational risks surface in it — often too late. Vyntra builds the platform that lets banks see what’s happening in real time.

We centralise and make searchable billions of financial messages. Our customers — over 130 financial institutions across 60+ countries — rely on us to detect risk, investigate issues, and stay compliant.

This is not brochureware. It’s deep, high-volume, production engineering.

The Role

We’re hiring a Senior Software Engineer to join the core Transaction Observability team in Mechelen. You’ll work in a small, autonomous scrum team building the engine that ingests, indexes and makes searchable massive volumes of financial transaction data in real time.

This is hands-on backend engineering at scale. You’ll design and build core features, optimise performance, and influence architectural decisions that directly impact global banks.

If you enjoy solving hard data problems and care about writing clean, performant Java — you’ll feel at home here.

What You’ll Work On

• Designing and building high-performance backend components in Java (11+)
• Real-time ingestion and indexing of large-scale transaction data
• Advanced search capabilities using Elasticsearch / Lucene
• Performance optimisation and scalability improvements
• Technical design discussions and architectural evolution
• Writing clean, well-tested, production-grade code

What We’re Looking For

• Strong Java backend experience (Java 11+), building production systems
• Experience with scalable, high-throughput systems
• Solid understanding of software design principles
• Comfortable owning features end-to-end
• Collaborative, pragmatic, product-minded

Highly valuable (but not mandatory):

• Hands-on experience with Elasticsearch or Apache Lucene
• Experience in fintech, regtech, or financial messaging
• Exposure to high-volume, real-time data systems

You must have the right to work in Belgium (no visa sponsorship available).

The Environment

• Hybrid working (3 days in our Mechelen office, 2 from home)
• Our office is directly opposite Mechelen station, making commuting by train straightforward..
• International team, English-speaking

French or Dutch is important for day-to-day life in Belgium. We’re open to candidates actively improving in one of them.

Compensation

€80,000 – €110,000 gross per year, depending on experience and impact, plus standard Belgian benefits.

Why This Role Is Different

• You’ll work on a platform used by major financial institutions globally
• The scale is real — billions of searchable messages
• The problems are technically demanding
• The team is small enough that your work has visible impact

If you’re a serious backend engineer who wants real technical depth and meaningful production impact — we’d like to talk.