Senior Java Engineer - Cloud & Microservices (GCP)

Capgemini; Wrocław; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

Capgemini Polska is seeking a Senior Java backend developer to design and build scalable backend systems using Java and the Spring ecosystem. You will focus on microservices, high performance, and code quality while collaborating with DevOps on cloud infrastructure.

You will work across REST APIs, memory management, GC tuning, and modern Java features, participating in code reviews and architecture discussions, with hybrid work options after onboarding.

Qualifications

• 5+ years of Java development (Senior)
• Strong core Java knowledge (collections, exceptions)
• Understanding of memory model and Garbage Collection
• Systems-thinking mindset and engineering experience
• Identify and resolve memory leaks
• Concurrency and multithreading expertise
• Experience with Future/Completable
• Familiarity with modern Java features (records, sealed classes, etc.)
• Hands-on with Spring Boot and Spring Data
• Design and implement REST APIs and microservices
• Unit and integration testing (JUnit, Mockito)
• Knowledge of microservice architecture principles
• GCP experience; hands-on preferred

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 and scalability
• Implementing unit and integration tests (JUnit, Mockito)
• Analyzing and resolving performance issues (memory leaks, GC)
• Applying modern Java features in daily development
• Collaborating with DevOps on cloud and infrastructure (GCP, Terraform)
• Participating in code reviews, technical discussions, and architecture design

Skills

Java

Spring

Microservices

REST APIs

JUnit

Mockito

GCP

Terraform

Memory management

Garbage collection

Concurrency

Multithreading

Code reviews

CI/CD

Tools

Spring Data

Git

Terraform

Job description

Capgemini Polska is seeking a Senior Java backend developer to design and build scalable backend systems using Java and the Spring ecosystem. You will focus on microservices, high performance, and code quality while collaborating with DevOps on cloud infrastructure.

You will work across REST APIs, memory management, GC tuning, and modern Java features, participating in code reviews and architecture discussions, with hybrid work options after onboarding.