Senior Java Developer (Kafka)
Confirmed on the employer's own hiring board on Nov 10, 2026. First seen by Alion on Nov 10, 2026.
Hello,
We are called People More because we treat our employees with respect, but also because the projects we work on are for people and should be easy and pleasant to use. We are technological, but we look at the bigger picture :)
The company is made up of people with a huge client base in the country and abroad, for whom we build projects from scratch (UX, UI, frontend, backend, mobile) or in part. We work directly for our clients and also support our partners in their own solutions. This ensures a wide range of projects and the ability to change! We work with clients all over the world.
For the project that we are working on with our partner, we are looking for Senior Java Developer with Kafka.
We are looking for an experienced Senior Java Developer to join a project where scalability, asynchronous processing, system performance and high-quality engineering are key.
Someone who goes beyond writing working Java code. You should be able to understand the wider impact of your technical decisions, design solutions for scale, choose the right technology for the problem and build new functionality without negatively affecting existing systems.
What you will be working with:
- Java / modern Java
- Spring / Spring Boot
- Kafka and event-driven architecture
- SQL and NoSQL databases
- CQRS
- Distributed and asynchronous systems
- High-volume data processing
- Scalable architectures
- AI-assisted development tools such as GitHub Copilot
Requirements that must be met:
- Strong commercial experience with Java and Spring Boot
- Very good knowledge of modern Java, including Records, immutability and Stream API
- Solid understanding of Java fundamentals: equals/hashCode, collections, reflection and Garbage Collection
- Good understanding of Spring internals and Dependency Injection
- Strong knowledge of SOLID, clean code, design patterns and code smells
- Experience with Kafka and event-driven architecture
- Understanding of idempotency, at-least-once delivery and Dead Letter Queues
- Experience designing scalable, asynchronous and high-performance systems
- Good understanding of SQL and NoSQL databases and ability to choose the right approach depending on the use case
- Knowledge of CQRS, ACID, indexing and database partitioning
- Ability to design solutions with performance, isolation, maintainability and security in mind
- Ability to discuss architectural decisions, explain trade-offs and adapt solutions based on technical discussions
- Practical experience using AI tools such as GitHub Copilot, with the ability to independently verify generated code through unit tests and edge cases
- Strong communication skills and a collaborative approach to software design
- Very good English and Polish
Responsibilities
130 - 160 PLN