Java Senior Software Engineer

Location: Remote - Bulgaria; Sofia, Bulgaria - Office About MariaDB MariaDB is making a big impact on the world. Whether you’re checking your bank account, buying a coffee, shopping online, making a phone call, listening to music, taking out a loan or ordering takeout – MariaDB is the backbone of applications used every day. Companies small and large, including 75% of the Fortune 500, run MariaDB, touching the lives of billions of people. With massive reach through Linux distributions, enterprise deployments and public clouds, MariaDB is uniquely positioned as the leading database for modern application development. The Role You will be responsible for the development and testing of a highly scalable, geo-distributed, highly performant database solution. You should have experience working on distributed software solutions and have a strong background working with on-premise and cloud-based solutions. You will also be responsible for managing a number of Software Engineers on the project. Java Senior Software Engineer Here at MariaDB, we are seeking a highly motivated and experienced Java Senior Software Engineer to lead the development of our highly scalable, geo-distributed, and highly performant database solution. This role requires a strong background in distributed software solutions, experience with both on-premise and cloud-based environments, and proven leadership abilities. You’ll be joining a small, highly skilled team where your work will have a direct impact. Expect to dig deep into replication, sharding, concurrency, and performance optimization—making our systems faster, smarter, and more resilient. You’ll collaborate globally, contribute to open source, and push the limits of what a distributed database can do. What You’ll Do Ensure the scalability, performance, and reliability of the database system. Collaborate with cross-functional teams to define, design, and ship new features. Troubleshoot and resolve complex issues in distributed environments. Profile, debug, and fine-tune performance with tools like JFR, JMC, async-profiler and VisualVM—and your own tricks. Keep code clean and reviewable with Git. Develop and optimize the data structures for providing the best experience accessing data in high data-intensive scenarios. Implement the best way to store data to disk and send data over the network to other nodes (including failure handling and recovery after failures). Implement and integrate algorithms for high availability of the whole cluster. Investigate flaws in data consistency algorithms, which may require thorough debugging either on multi-node clusters and in low-level byte-represented data. What You Bring 4+ years of experience in Java programming. Deep knowledge of concurrency in Java and Java Memory Model and/or of concurrency model in other programming systems. Excellent Java SE knowledge including IO, JVM internals, etc. Experience with SQL databases. Experience in troubleshooting Java applications and/or databases. Excellent leadership, problem-solving, and debugging skills. Experience working effectively in fast-paced, collaborative environments. Deep SQL knowledge (MariaDB/MySQL/PostgreSQL/Apache Ignite/GridGain) and passion for distributed systems (Raft, MVCC, ACID, etc). Understands MVCC and P2PL, and the difference between Snapshot Isolation and REPEATABLE READ. The following may be a strong plus: Experience with NoSQL and/or distributed databases. Experience with building highload distributed systems and algorithms. Experience with Docker, Kubernetes and/or public Cloud (AWS, GCE, Azure, etc.) Open-source contributions, automation expertise, or performance/load testing. Active use of AI. Location Hybrid / Remote – Bulgaria Remote – Croatia, Estonia, Finland, Italy, Poland, Romania, Serbia, Spain, Armenia, Cyprus. Why You’ll Love It Here A globally distributed team where your work is tangible, valuable and appreciated. Remote or Hybrid work options (location dependent) Projects that stretch your skills and make an impact at scale. Competitive pay, 25 days paid annual leave (plus holidays), and a culture that values creativity and clean engineering. Compensation Salary Range : €74,200 - €90,000 per year (gross) Please note: The starting salary offered will be commensurate with the candidate's skills, qualifications, and relevant experience, in alignment with our gender-neutral compensation framework. How to Apply If you are interested in this position, please submit your application along with your CV/Resume through our ATS Greenhouse on our MariaDB Careers site. At MariaDB, we celebrate the diverse experiences and perspectives of our employees because this drives innovation and success. MariaDB is an equal opportunity employer dedicated to creating a welcoming and inclusive workplace for everyone. MariaDB does not sponsor work visas or relocation. MariaDB is committed to providing accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter. MariaDB will not accept agency resumes without a prior contractual agreement with HR. Please do not forward resumes to any recruiting alias or employee directly. MariaDB is not responsible for paying any fees associated with any unsolicited submitted CV/Resumes.