Tell about one of your recent technically complex tasks — what it was and how you solved it.

One of the latest technically complex tasks was related to optimizing the performance of a microservice that processed large volumes of data in real-time. The problem was that the response time of the service significantly increased as the load grew.

To solve this, I conducted profiling of the application, identified bottlenecks in database operations and data processing algorithms. The main measures:

• Rewrote critical database queries using indexes and optimized JOINs.
• Implemented caching of frequently requested data using Redis.
• Redesigned the data processing logic, replacing several sequential loops with stream processing using Java Stream API.

As a result, the response time was reduced by 3 times, and the system became more resilient to peak loads. This experience demonstrated the importance of a comprehensive approach to optimization and deep problem analysis.