Senior Java Engineer (m/f/n)

Company Description

In Post Groupis an innovative European out of home deliveries company, revolutionizing the way parcels are delivered to customers.

With operations across several countries, our network of intelligent lockers provides customers with a fast, convenient, and secure delivery option.

In Post Group is a publicly traded company, with a market capitalization of about $5 billion as of March 2023.

With over10,000 people worldwide, In Post Group is one of the largest out of home delivery providers in Europe, committed to providing sustainable and efficient delivery solutions to meet the evolving needs of customers in today's rapidly changing landscape.

We are currently hiring Senior Engineers for two different teams

• In Post Pay – a comprehensive e-commerce solution offering a unified platform for payment and delivery.

In Post Pay allows users to pay and arrange delivery with one button on the product card, transferring the basket and order to the In Post app.

It simplifies the shopping experience by consolidating payments, deliveries, and order tracking into a single app, eliminating the need for multiple emails and messages from different stores.

• Hybrid model: 1 day per week from the office in Warsaw or Kraków, remaining days remote
• Merchant Portal – a new, In Post-owned platform that serves as a central hub for all merchant-facing services.

This covers the full merchant journey: onboarding, shipping, and access to other In Post products.

The team acts as a core/platform team, meaning they provide shared services and infrastructure consumed by other In Post teams.

• Fully remote position

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 (Postgre SQL)
• 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
• You understand your product deeply – the business context, the customer impact, the why behind every feature
• Working across a large organisation with many teams is complex. You navigate that complexity, build bridges, and push things over the finish line
• 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
• Postgre SQL – 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., Git Hub Copilot, Chat GPT, 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
• g RPC, Graph QL
• GCP: Cloud Functions, Pub/Sub, GKE, Cloud Spanner
• Mongo DB
• Experience with high‑throughput, low‑latency systems
• Background in e‑commerce, logistics, or fintech
• Additional Information

Why Join In Post?

• 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.
• In Post 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 In Post 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
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