Tell us about your experience at your last job, especially regarding high-load and fintech parts, architectural solutions, and optimization.

At my last job, I participated in the development of a high-load fintech platform that processed millions of transactions per day. The architecture used microservices in PHP with Symfony and Laravel, and for data exchange, RabbitMQ and Redis were used.

To ensure scalability and fault tolerance, the following solutions were implemented:

• Load balancing and horizontal scaling of services.
• Caching frequently requested data in Redis to reduce database load.
• Using CQRS to separate read and write operations, which improved performance.
• Optimizing database queries with indexes and denormalization.

Special attention was paid to security in the fintech part: data encryption, operation auditing, protection against repeated transactions.

Optimization included code profiling, eliminating bottlenecks, implementing asynchronous task processing, and using queues for heavy operations.