Senior Java Engineer (m/f/n)

InPost Group is an innovative European out of home deliveries company operating across several countries with a network of intelligent lockers providing fast, convenient, and secure parcel delivery. It is a publicly traded company with about $5 billion market capitalization as of March 2023 and employs over 10,000 people worldwide, being one of the largest out of home delivery providers in Europe. The company focuses on sustainable and efficient delivery solutions and is currently hiring Senior Engineers for two teams: InPost Pay, an e-commerce platform with a hybrid work model based in Warsaw or Kraków, and Merchant Portal, a core platform team providing merchant-facing services with a fully remote position.

• 5+ years of commercial Java development (Java 11/17+, Spring Boot, Spring Security, JPA/Hibernate)
• Strong experience with distributed systems, microservices, event-driven patterns
• Deep JVM internals knowledge: memory model, GC tuning, concurrency, performance profiling
• Experience with Apache Kafka: producers, consumers, consumer groups, offset management, error handling
• Proficiency with PostgreSQL relational modelling, indexing, query plans, schema migrations
• Day-to-day production usage of Docker and Kubernetes
• Familiarity with Maven/Gradle, Git, JIRA, Confluence, Code Reviews, CI/CD
• Ability to work with non-technical stakeholders and produce readable design documents
• English B2+ for team and stakeholder communication
• Proficiency in leveraging AI tools and large language models (e.g., GitHub Copilot, ChatGPT, Claude) to enhance productivity and solve complex problems
• Ability to critically evaluate AI-generated outputs responsibly

Nice to have:

• Kotlin development experience
• Domain-Driven Design (DDD), CQRS, Event Sourcing
• gRPC, GraphQL
• GCP services: Cloud Functions, Pub/Sub, GKE, Cloud Spanner
• MongoDB
• Experience with high-throughput, low-latency systems
• Background in e-commerce, logistics, or fintech

Engineering:

• Design and implement high-performance microservices in Java / Spring Boot
• Build and maintain event-driven integrations using Apache Kafka
• Own the data layer: schema design, query optimisation, migrations with PostgreSQL
• Work within a containerised cloud-native environment: Docker, Kubernetes, GCP
• Maintain code quality through reviews, testing standards, and CI/CD discipline
• Mentor team members and advocate for continuous improvement

Ownership & Delivery:

• Take full ownership of features end-to-end from requirements to production
• Collaborate with business stakeholders to align on solutions
• Understand product deeply including business context and customer impact
• Navigate organizational complexity, build bridges, and ensure delivery
• Write clear technical documentation: System Design docs, RFCs, ADRs
• Proactively address technical debt
• Participate actively in architecture discussions with well-reasoned proposals