Senior Software Engineer (Java, GCP)

Capgemini; Kraków; Hybrid; PLN 180,000 - 320,000; Full time

Benefits offered by this job

Hybrid work model

Extensive training programs

Private medical care (Medicover)

Job summary

Capgemini Polska is seeking an experienced Senior Java backend engineer to design and develop backend systems using Java and the Spring ecosystem. You will focus on microservices with high performance, scalability, and automated testing, while collaborating with DevOps on cloud infrastructure.

The role requires strong Java fundamentals, Spring Boot, REST API design, and 5+ years of experience. A hybrid work model, modern office environment, and opportunities for training are offered.

Qualifications

• 5+ years of Java development experience.
• Strong knowledge of core Java and memory management.
• Experience with Spring Boot and Spring Data.
• Designing REST APIs and microservices.
• Unit and integration testing with JUnit/Mockito.
• Familiarity with cloud and DevOps practices on GCP.

Responsibilities

• Designing and developing backend systems using Java and Spring ecosystem.
• Building and maintaining microservices-based architectures.
• Writing high-quality, maintainable code with focus on performance.
• Implementing unit and integration tests (JUnit, Mockito).
• Collaborating with DevOps on cloud infrastructure (GCP, Terraform).
• Participating in code reviews and architecture design.

Skills

5+ years Java development

Core Java knowledge

Memory model & GC understanding

Concurrency & multithreading

REST APIs & microservices design

Spring Boot & Spring Data

Tools

Docker

Kubernetes

Jenkins

GitLab CI

Terraform

GCP

Job description

Choosing Capgemini means choosing a company where you will be empowered to shape your career in the way you’d like, where you’ll be supported and inspired by a collaborative community of colleagues around the world, and where you’ll be able to reimagine what’s possible. Join us and help the world’s leading organizations unlock the value of technology and build a more sustainable, more inclusive world.

Your Role

On this role, you will be responsible for designing and developing backend systems using Java and the Spring ecosystem, with a strong focus on microservices architecture. You will ensure high code quality, performance, and scalability while implementing automated tests and resolving performance-related issues. You will actively collaborate with DevOps teams on cloud infrastructure and contribute to code reviews, technical discussions, and architecture design.

Your Tasks

• Designing and developing backend systems using Java and Spring ecosystem
• Building and maintaining microservices-based architectures
• Writing high-quality, maintainable code with strong focus on performance and scalability
• Implementing unit and integration tests (JUnit, Mockito)
• Analyzing and resolving performance issues (e.g., memory leaks, GC behavior)
• Applying modern Java features and best practices in daily development
• Collaborating with DevOps teams on cloud and infrastructure (GCP, Terraform)
• Participating in code reviews, technical discussions, and architecture design
  

Your Profile

• 5+ years experience in Java development
• Strong knowledge of core Java (collections, access modifiers, exception handling)
• Understanding of Java memory model, memory structure, and Garbage Collection
• Engineering experience and a systems-thinking mindset
• Ability to identify and resolve memory leaks
• Solid knowledge of concurrency (synchronized, volatile, atomic types)
• Experience with Future / Completable
• Future and multithreading concepts
• Familiarity with modern Java features (records, sealed classes, default methods, virtual threads – at least theoretical)
• Hands‑on experience with Spring Boot and Spring Data
• Experience in designing and implementing REST APIs and microservices
• Practical experience with unit and integration testing (JUnit, Mockito)
• Understanding of microservice architecture principles
• Exposure to GCP
  

Nice To Have

• Docker, Kubernetes (cloud-native approach)
• Messaging systems (Kafka, ActiveMQ)
• CI/CD tools (Jenkins, GitLab CI)
• Basic knowledge of Terraform / Infrastructure as Code
• Experience working in Agile (Scrum/Kanban)
• Experience in distributed systems and observability tools
• Experience working with high-load systems
  

What You'll Love About Working Here

• Enjoy hybrid working modelthat fits your life - after completing onboarding, connect work from a modern office with ergonomic work from home, thanks to home office package (including laptop, monitor, and chair). Ask your recruiter about the details.
• Access to over 70 training trackswith certification opportunities (e.g., GenAI, Architects, Google) on our NEXT platform. Dive into a world of knowledge with free access to Education First languages platform, Pluralsight, TED Talks, Coursera and Udemy Business materials and trainings.
• Practical benefits:private medical care with Medicover with additional packages (e.g., dental, senior care, oncology) available on preferential terms, life insurance and 40+ options on our NAIS benefit platform, including Netflix, Spotify or Medicover Sport.
  

Get To Know Us

Capgemini is committed to diversity and inclusion, ensuring fairness in all employment practices. We evaluate individuals based on qualifications and performance, not personal characteristics, striving to create a workplace where everyone can succeed and feel valued.
Do you want to get to know us better? Check our Instagram — @capgeminipl or visit our Facebook profile — Capgemini Polska. You can also find us on YouTube.

About Capgemini

Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organizations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of over 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2025 global revenues of €22.5 billion.