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Senior Java Developer

Sigma Software
Polandfull_timeVerifiedPosted 25 Jul 2025

About the role

Company Description

We are seeking an experienced and visionary Senior Java Developer to play a key role in our software development initiatives. This project requires a developer who can plan, build, and deliver tasks as part of a team. As a solid group, we share responsibility for product delivery, including speed, efficiency, and quality. We also take full responsibility for the operational conditions of what we deliver.  
As an individual, you need to take ownership, drive initiatives forward, suggest improvements, and incorporate them in all areas.   
   
If this approach resonates with you, we invite you to join us! 

CUSTOMER
Our Customer owns one of the largest mobile gambling platforms, which has millions of users. 

PROJECT
We work with a large company on a project using a startup approach. We use a state-of-the-art technology stack.   
   
This new, proprietary, multi-brand platform will enable the Swedish operator to launch new brands under a collective name with a high level of flexibility and scalability.

Job Description

  • Design, develop, and maintain Java-based applications
  • Collaborate with cross-functional teams to define, design, and release new features 
  • Write clean, maintainable, and efficient code following best engineering practices 
  • Optimize application performance and troubleshoot issues
  • Participate in code reviews to ensure high-quality software development
  • Work with databases, APIs, and third-party integrations
  • Stay up –to date with the latest Java technologies and frameworks 

Qualifications

  • 5+ years of experience with Java, including Java 8-17 
  • Proficiency in Spring Boot 
  • Experience with messaging systems such as Kafka and RabbitMQ 
  • Ability to design and implement Back-end services from scratch 
  • Solid understanding of relational databases, particularly MySQL 
  • Experience in building scalable, fault-tolerant systems and working with microservice architectures 

WOULD BE A PLUS

  • Knowledge of Kotlin 

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Company

Sigma Software

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