Leonid Krainov

I’m a Golang developer with 4+ years of commercial experience in teams of 2 to 10 people. I’ve worked across the full product lifecycle—from architectural design to building automated release pipelines and post-launch support—specializing in microservice architectures, balanced systems, and service orchestration.

At T-Bank, I enhanced reliability and observability by implementing comprehensive metrics, distributed tracing, and alerting frameworks—achieving a 99.9% SLA and reducing incident detection and resolution time by 58%. I designed and built a core RecSys engine adopted by 7 production rankers across independent teams, becoming the company-wide standard for recommendation pipelines.

I also drive quality and change management: I oversaw test coverage reaching 88% and built integration and end-to-end test suites, while coordinating cross-team migration of the cashback recommendation system from offline to online inference. Previously at Sberbank, I built a crypto broker to production, owned 5 core microservices end-to-end, bootstrapped Kafka-based async messaging with Kafka Connect and Debezium, and optimized hot paths to cut allocs/op by 37%.