Senior Java Developer

co.brick talents — powered by AI, powered by people. 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 & ProjectOn 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 HaveBasic understanding or exposure to frontend technologies (React / TypeScript).

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

What We OfferA 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.