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 a market capitalization of about $5 billion as of March 2023 and employs over 10,000 people worldwide. The company offers two teams for Senior Engineers: InPost Pay, a hybrid model based in Warsaw or Kraków, and Merchant Portal, 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, inter-service communication
• Deep JVM internals knowledge: memory model, GC tuning, concurrency, performance profiling
• Experience with Apache Kafka: producers, consumers, consumer groups, offset management, error handling
• Proficiency in PostgreSQL: relational modelling, indexing strategy, query plans, schema migrations
• Experience with Docker and Kubernetes in day-to-day production usage
• Familiarity with Maven/Gradle, Git, JIRA, Confluence, Code Reviews, CI/CD
• Ability to work with non-technical stakeholders and write clear design documents
• English B2+ for team and stakeholder communication
• Proficiency in leveraging AI tools and large language models (e.g., GitHub Copilot, ChatGPT, Claude) 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 (PostgreSQL)
• Work within a containerised cloud-native environment: Docker, Kubernetes, GCP
• Hold the bar on code quality through reviews, testing standards, and CI/CD discipline
• Mentor team members and advocate for a culture of quality and continuous improvement

Ownership & Delivery:

• Take full ownership of features end-to-end from requirements to production and beyond
• Work directly with business stakeholders to challenge assumptions and align on solutions
• Write clear technical documentation: System Design docs, RFCs, and ADRs
• Identify and address technical debt proactively before problems become incidents
• Participate actively in architecture discussions with well-reasoned proposals