Senior Java Engineer - hybrid (m/f/n)

InPost Group; Polska; Hybrid; PLN 170,000 - 320,000; Full time

Job summary

InPost Group is hiring Senior Engineers for InPost Pay, a comprehensive e-commerce solution integrating payments, delivery, and order tracking within one app. The role is hybrid: 1 day per week in the Warsaw or Kraków office and remote the rest of the week.

You will design and implement high-performance microservices in Java/Spring Boot, build event-driven integrations with Kafka, and own the data layer in PostgreSQL. A strong focus on code quality, documentation, and mentorship is expected.

Qualifications

• 5+ years of commercial Java development (Java 11/17+).
• Strong experience with distributed systems and microservices.
• Deep JVM internals: memory model, GC tuning, concurrency.
• PostgreSQL relational modelling, indexing, migrations.
• Ability to write design docs and work with non-technical stakeholders.
• English at least B2+ for team communication.
• Experience leveraging AI tools to boost productivity.

Responsibilities

• 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, migrations, query optimisation (PostgreSQL).
• Work in a containerised cloud-native environment: Docker, Kubernetes, GCP.
• Maintain code quality via reviews, tests, and CI/CD discipline.
• Mentor teammates and promote quality and continuous improvement.

Skills

Java

Spring Boot

Spring Security

JPA/Hibernate

Distributed systems

Microservices

Event-driven

JVM internals

PostgreSQL

English (B2+)

AI tools usage

AI output evaluation

Tools

Docker

Kubernetes

GCP

Apache Kafka

PostgreSQL (DB)

GitHub Copilot / ChatGPT / Claude

Job description

InPost 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. InPost Group is a publicly traded company, with a market capitalization of about $5 billion as of March 2023. With over10,000 people worldwide, InPost 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 forInPost Pay- a comprehensive e-commerce solution offering a unified platform for payment and delivery. InPost Pay allows users to pay and arrange delivery with one button on the product card, transferring the basket and order to the InPost 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

Job Description

Your responsibilities:

• 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
• 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
• PostgreSQL -relational modelling, indexing strategy, query plans, schema migrations
• 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

• 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