Senior Java Engineer (m/f/n)

Job Description

Your responsibilities:

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

Qualifications

• 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: memory model, GC tuning, concurrency, performance profiling
• Apache Kafka - producers, consumers, consumer groups, offset management, error handling
• PostgreSQL - relational modelling, indexing strategy, query plans, schema migrations
• Docker + Kubernetes - day-to-day production usage
• Maven/Gradle, Git, JIRA, Confluence, Code Reviews, CI/CD
• Proven ability to work with non-technical stakeholders and write design documents others want to read
• English B2+ - team and stakeholder communication
• Proficiency in leveraging AI tools and large language models (e.g., GitHub Copilot, ChatGPT, Claude) to enhance productivity, accelerate development, and solve complex problems. 
• Ability to critically evaluate AI-generated outputs and apply them responsibly within professional workflows.

Nice-to-have

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

Additional Information

Why Join InPost? 

• Opportunity to work in a diverse, international, and cross-functional environment, along with leading experts. 
• You work and learn from a senior leader and their leadership team, expanding your experience and exposure in the e-commerce and logistics industries. 
•  InPost is a growing company that offers its people an increasing number of opportunities in several locations in Europe. 
• Fulfilling careers with a range of benefits and investing in providing training opportunities for people development. 
• You will feel a part of the InPost community that makes an impact on sustainability, convenient deliveries, and the circular economy every day. 
• Excellent working environment and flexible hours
• We offer B2B type of Contract