Mid/Senior Java Backend Engineer (Spring Boot)_TT
First seen by Alion on Oct 21, 2026.
We are looking for a Mid/Senior Java Backend Engineer to join the insurance division of a large Polish software company. This is a backend-first role: you will build high-performance services and integrations with external providers for in-house platforms used by insurers in Poland and abroad. The platforms cover the full policy lifecycle and claims handling and process millions of operations every month. You will work in an international team with colleagues from Scandinavia, Belgium and Poland, on modules such as financial settlement, accounting, investment funds and claims. The team works in a Spec Driven Development model with AI agents, using them for specs, planning, documentation and tests. Over time, you may also pick up Angular tasks as the project needs, so openness to frontend work is important.
Details:
Schedule: Full time
Location: Hybrid – Kraków, Gdańsk, Łódź or Poznań, Poland (3 days in the office, 2 remote; more office time during onboarding, up to 3 months)
Start: ASAP
Duration: Long-term
English: Upper-Intermediate (B2)
Polish: Elementary (B2) or higher
Type of collaboration: Internal Employment (UoP) or B2B Contract – your choice
About the project:
The company is one of the largest software vendors in Poland. Its insurance division builds its own platforms for insurance companies in Poland and other European markets. These systems support the whole policy lifecycle, from product setup and sales to policy servicing and claims processing. They handle millions of operations a month, so performance, reliability and data accuracy really matter. The division is growing fast and is adding engineering teams in several Polish cities. Teams are international and work closely with business analysts and insurance domain experts. Engineering is moving toward structured, AI-assisted development, where AI agents support specs, planning, documentation and testing.
You have:
4+ years of commercial software development experience
Strong commercial experience with Java and Spring Boot in production systems (experience limited to CMS/AEM or legacy J2EE is not a fit)
Experience building high-performance REST APIs
Experience building integrations with external providers and third-party systems
Experience with MongoDB and/or PostgreSQL
Openness to learning Angular and taking on frontend tasks over time
Structured use of AI tools in development (specs, planning, tests), not only autocomplete
Polish at A2 level or higher (everyday conversation), as some teams work in Polish
English at B2 level (team communication and technical documentation)
Legal right to work in Poland (e.g. Karta Pobytu, permanent residence or EU citizenship)
Readiness to work from the office in Kraków, Gdańsk, Łódź or Poznań 3 days a week
Nice to have:
Experience in the insurance, banking or fintech domain
Experience with microservices, event-driven architecture (Kafka), sagas or DDD
Any hands-on experience with Angular or TypeScript
What to do:
Design, build and maintain backend services in Java and Spring Boot for insurance platforms
Build high-performance REST APIs and integrations with external providers
Work with MongoDB and PostgreSQL databases
Work on business modules such as financial settlement, accounting, investment funds and claims
Use AI agents in a Spec Driven Development process to write specs, plan work, document solutions and create tests
Collaborate with an international team (Scandinavia, Belgium, Poland), business analysts and domain experts
Take part in code reviews and architecture discussions
Pick up Angular frontend tasks when the project needs them