Java Backend Developer

Work mode: Hybrid – 3 days from the Warsaw or Cracow office.

Duration: > 3 months contract.

Onboarding: 2 weeks in Malmo, Sweden.

Start: August 3rd at the latest.

Contract: B2B – up to 195 zl/h.

Recruitment process: 2 meetings.

Project language: English.

Industry: Technology.

Workload: Full time (40 hours per week).

Summary

The Backend Developer role is aimed at enhancing and modernizing backend services and pipelines within the organization. This position focuses on improving system performance, ensuring robust authentication mechanisms, and implementing automation to streamline processes.

Main Responsibilities

• Modernise backend services and pipelines by upgrading to the latest JDK, Scala 3.x, and Play Framework 3.x.
• Apply GenAI tooling to automate code transformations, dependency resolution, and compatibility fixes, producing reusable tools and documentation.
• Migrate authentication frameworks from legacy APIs to OAuth-based solutions across various backend services.
• Replace multiple data stores with a single versioned table, creating Spark/Java batch pipelines for backfill/migration and extending Scala/Play backends.

Key Requirements

• Hands-on experience with production Java/Scala services.
• Familiarity with Play Framework internals.
• Experience with Spark for pipeline-heavy work.
• Comfortable with OAuth-based authentication patterns.

Nice to Have

• Familiarity with React/TypeScript.
• For DevOps-leaning candidates: experience with Gradle, scripting, and CI/CD pipelines.

Other Details

Tools/Methodologies: Java, Scala, Play Framework, Spark, OAuth.