Multithread Java Developer

About is  🚀

We are looking for a skilled Multithreaded Java Developer to join our dynamic team. If you are passionate about building high-performance, concurrent systems and have solid experience with multithreaded programming in Java, we want to hear from you!
As a Java Developer in our team, you will be responsible for designing and developing robust, scalable, and thread-safe server-side applications that operate in distributed environments.

This role requires a hybrid working model, with 3 days per week working from our office in Budapest.

Requirements

Key Responsibilities 💻

• Developing and maintaining multithreaded, Java-based backend systems – this will be the core focus of your technical work

• Designing and optimizing complex, distributed system architectures

• Managing a codebase of approximately 2 million lines, including extending it with new features

• Using CI/CD pipelines, Terraform, and Kubernetes as part of our deployment processes

• Proposing technical improvements, analyzing issues, and contributing to architectural decisions

• Mentoring junior team members and helping raise the technical bar across the team

• Collaborating with a global, diverse development team in an agile environmen

What will you need 💪

• Strong Java expertise, with a focus on multithreading and concurrent programming

• Experience in designing and optimizing distributed systems

• Familiarity with DevOps tools and practices, including CI/CD, Terraform, and Kubernetes

• Solid understanding of both relational (e.g., PostgreSQL, Oracle) and NoSQL databases

• A responsible mindset, strong communication skills, and openness to knowledge sharing

• System-level thinking and a solid foundation in software engineering best practices

Why should you join 🤸

🥷 BlackBelt team - You can join a cool and professional team, where everyone has a BlackBelt in technology;
🧠 Development - We are supporting your growth with trainings and certifications;
👣 Diversity - You can switch between projects and Delivery Units;
😮 WOW - We are supporting our colleague's health and well-being with WOW (Wellbeing Office Way) program;
🧡 Support - We are a caring organisation, if you face difficulties you can always count on us.