Senior Java Developer

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Senior Backend Engineer (Scala / Java) – 3-Month Project

• Salary: Up to 175 PLN/h net + VAT (B2B Contract)

• Location: Hybrid – Warsaw or Kraków (strictly 3 days/week from the office – non-negotiable)

• Onboarding: 2 weeks on-site in Malmö, Sweden (fully covered)

• Project Duration: 3 months

• Start Date: ASAP/Beginning of August at the ABSOLUTE LATEST
  

  About the Client & Project

  On behalf of our client, an innovative company from the technology sector, we are looking for a Strong Senior Backend Developer to join a short-term, high-impact project. The main goal is to modernize and optimize core backend services, streamline data pipelines, and enhance system security.

  This is a highly autonomous role requiring a seasoned engineer who can jump straight into a complex ecosystem, utilize automation tools for framework upgrades, and handle heavy data migration tasks.

  Key Responsibilities

  • Modernize and refactor backend services by upgrading legacy Java and Scala-based frameworks.

  • Leverage automation and modern tooling to expedite code transformations, dependency resolution, and compatibility fixes.

  • Migrate legacy authentication mechanisms across various services to secure, OAuth-based solutions.

  • Consolidate multiple data stores into unified, versioned tables by designing and executing heavy Spark/Java batch pipelines.

  Requirements

  • Minimum of 5 years of commercial backend experience (7+ years is highly preferred).

  • Deep production experience with Java and Scala.

  • Strong familiarity with Play Framework OR Akka (experience with Akka/Pekko is highly acceptable if you are ready to work with Play environments).

  • Hands-on experience with Spark for complex, heavy data pipeline processing.

  • Solid understanding and practical experience with OAuth authentication patterns.

  • Excellent communication skills with Full Professional English (the project language is 100% English).

  • Full availability for a 2-week onboarding trip to Sweden at the very start of the contract.

  Nice to Have

  • Basic understanding or exposure to frontend technologies (React / TypeScript).

  • DevOps mindset: familiarity with CI/CD pipelines, Gradle, and scripting.

  What We Offer

  • A transparent, quick 2-stage recruitment process.

  • An attractive hourly rate with seamless B2B invoicing.

  • An opportunity to work on a high-exposure architectural modernization project for an international client.