Kaysar I.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Is your database running slowly, experiencing replication issues, or struggling to meet your application's performance and availability requirements? I help businesses solve complex database challenges, improve performance, and build reliable database environments that support business-critical applications. With **15+ years of professional experience** across banking, telecommunications, fintech, software, and managed database services, I bring hands-on expertise in database engineering, production operations, performance optimization, and high availability. ### What I can help you with **Database Performance & SQL Optimization** - Diagnose slow queries, inefficient execution plans, and database bottlenecks. - Optimize SQL statements, indexing strategies, and database configurations. - Investigate CPU, memory, storage I/O, locking, and concurrency issues. **High Availability, Replication & Clustering** - Design, configure, and troubleshoot MySQL replication and clustering. - Configure and optimize MariaDB Galera clusters. - Resolve replication failures, synchronization issues, and cluster instability. - Improve database availability and operational resilience. **Database Migration, Upgrade & Modernization** - Plan and execute database migrations across environments and platforms. - Upgrade MySQL and MariaDB while addressing compatibility and operational risks. - Migrate database workloads to cloud and managed database platforms. - Support PostgreSQL migration, configuration, and performance optimization. **Database Administration & Production Support** - Troubleshoot critical database incidents and production performance problems. - Implement backup, recovery, and disaster recovery strategies. - Perform database configuration, maintenance, and operational reviews. - Provide practical recommendations for stability, scalability, and reliability. ### Database Technologies - **Relational:** MySQL, MariaDB, PostgreSQL, Oracle Database - **NoSQL:** MongoDB - **Caching:** Redis - **Cloud & Infrastructure:** AWS RDS, Amazon Aurora, AWS infrastructure, Linux, and hybrid environments ### Why clients work with me My Upwork history includes **45 completed jobs**, with more than **25 five-star contract ratings**. Client feedback has specifically recognized my database expertise, analytical approach, communication, reliability, and ability to resolve challenging technical issues. Examples of completed engagements include: - MySQL 8 Enterprise Cluster configuration. - MariaDB Galera cluster optimization and troubleshooting. - PostgreSQL query and performance optimization. - AWS RDS to MariaDB Galera migration. - MySQL replication repair and production troubleshooting. - MySQL-to-MariaDB version upgrades. - PostgreSQL server migration and database performance improvements. I focus on understanding the underlying problem rather than applying temporary fixes. My approach is analytical, practical, and oriented toward solutions that are maintainable in production. **Have a database performance issue, replication problem, migration requirement, or challenging DBA task?** Share your requirements and current environment. I can help assess the problem, identify the right approach, and work toward a reliable solution.