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Open nowPosted 183 days ago

Senior Java Engineer / Mateusz Król

antalpl1,060 open roles

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Your applicationOpen nowSenior Java Engineer / Mateusz Królantalpl

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The clock on this job

Early applications get read.

11.8% of postings close within 7 days. Measured by our own scanner across the market. antalpl postings stay open a median of 1 days.

Share of postings closed within
  1. 2.1%1 day
  2. 4.4%3 days
  3. 11.8%7 days
  4. 18.6%14 days
  5. 35.6%30 days
  6. 45.1%60 days
This job: posted 183 days ago

antalpl median: 1 days open

The posting

Senior Software Engineer — Java / Microservices

Start date: ASAP | Contract type: B2B (145-170pln) | Work mode: 100% Remote

About the Team

You'll be joining a multidisciplinary team of senior engineers within a Consumer & Merchant domain, working on end-to-end parcel creation flows and some of the company's largest technical initiatives.

The team operates with high autonomy — engineers have real influence over architectural decisions and drive solutions from analysis all the way to production. The culture is built on knowledge sharing, mutual respect, and engineering excellence, with a genuinely friendly atmosphere.

Your Responsibilities

  • Design and implement microservices following Hexagonal Architecture principles within a large-scale distributed system
  • Drive topic analysis and requirement discovery — from business needs to solution architecture and delivery
  • Build and maintain event-driven integrations using Kafka, Avro, and the Transactional Outbox pattern
  • Write comprehensive automated tests: unit, integration, contract (Spock, Testcontainers, Spring Cloud Contract)
  • Participate actively in code reviews and help raise the bar on code quality
  • Work in a CI/CD environment: GitLab CI, Docker, Kubernetes + Helm (GitOps)
  • Use AI-assisted development tools (Claude Code is the team standard) as a primary daily productivity tool — agentic, AI-first development is how this team operates

Tech Stack

Language & Frameworks: Java 21, Spring Boot 3.x/4.x (MVC & WebFlux), Gradle Databases: PostgreSQL (JPA/Hibernate, R2DBC), MongoDB Messaging: Apache Kafka + Avro + Confluent Schema Registry Patterns: Hexagonal Architecture, Microservices, Event-Driven Design, Transactional Outbox Security: OAuth2 / JWT, Spring Security, OpenFGA Testing: Spock Framework, Testcontainers, WireMock, REST-Assured, ArchUnit, PIT Mutation Testing Infrastructure: GitLab CI, Docker, Kubernetes + Helm (GitOps) Observability: Micrometer, Prometheus, SonarQube, Checkstyle AI Tooling: Claude Code (mandatory) / GitHub Copilot / Cursor

Requirements

Must have:

  • Strong experience with Java 21+ and Spring Boot MVC
  • Hands-on knowledge of Kafka, PostgreSQL and/or MongoDB
  • Familiarity with Hexagonal / Clean Architecture and microservices patterns
  • Experience with automated testing (Spock or JUnit, Testcontainers, contract testing)
  • Proficiency with Kubernetes, Helm, and GitLab CI pipelines
  • Solid understanding of OAuth2/JWT-based security
  • Mandatory proficiency with AI coding tools — Claude Code is the company standard; experience with agentic development workflows is a strong plus

Nice to have:

  • Experience with Spring WebFlux (reactive stack)
  • Familiarity with OpenFGA or similar fine-grained authorisation systems
  • Background in Consumer-Driven Contract testing (Spring Cloud Contract)

What Makes This Role Challenging

  • Complex distributed system — dozens of microservices with numerous communication channels; understanding the big picture is as important as writing good code Near-100% uptime requirement — business-critical systems where reliability and fault tolerance are non-negotiable High autonomy from day one — independently analyse topics, identify stakeholders, and deliver solutions end-to-end AI-first way of working — using Claude Code and agentic workflows to accelerate delivery is a core part of how the team operates, not a nice-to-have
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