Twikey builds software for automating recurring payments: digital contract and mandate signing, SEPA direct debit processing, invoicing logic, and integrations with European banks and accounting systems. We’re growing and looking for a Senior Back-end Engineer to help improve and extend the core of our platform.
You’ll work with the CTO and a small engineering team on real production challenges: performance, correctness, data modelling, integration workflows, and system reliability. The role is hands-on and technical: clean code, maintainability, and measurable improvements matter.
Stack: Java + Spring, Go, PostgreSQL, REST APIs, Linux. (Front-end uses Angular/Svelte.)
What you’d work on
- Improving backend performance (queries, caching, algorithms, data flows)
- Designing and implementing new backend features
- Keeping the codebase clean, testable, and maintainable
- Working on integrations with banks and third-party systems
- Reviewing code, proposing improvements, reducing complexity
- Contributing to release processes in an Agile environment
Requirements
- 5+ years professional experience with Java + Spring
- Strong experience with PostgreSQL
- Comfortable improving performance and understanding system behavior under load
- Writes clean, structured, testable code
- Communicates clearly and works well in a small team
- Fluent in at least two of: Dutch / English / French
- Nice to have: API integrations, web services, Linux, fintech/banking domain knowledge
If you’re motivated by clean code, stable systems, and performance improvements, we’d like to hear from you.