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Ivan Boiko

@ivanboiko

Message

Senior Go Engineer at Payrails who cut payment endpoint p99 latency from ~800 ms to ~350 ms.

Spain

Message

At Payrails, I reduced p99 latency for the payment creation endpoint from ~800 ms to ~350 ms by profiling hot paths and eliminating unnecessary allocations and synchronous calls. I also migrated webhook processing to Kafka/SQS consumers, helping the service handle 3x traffic spikes without latency degradation.

At DataArt, I designed and implemented Go microservices and optimized PostgreSQL queries, reducing heavy query execution time by ~40%. Earlier, at X5, I optimized database queries and developed tests that increased coverage from ~60% to ~90%.

Experience

Work history, roles, and key accomplishments

Current

Senior Go Engineer

Current

Payrails

Nov 2023 - Present (2 years 11 months)

Reduced p99 latency of payment endpoint from ~800ms to ~350ms and migrated webhook processing to async model, ensuring stability during 3x traffic spikes. Cut AWS costs by ~20% and implemented idempotent payment endpoints.

Go PostgreSQL Redis REST APIs gRPC Kafka Docker Kubernetes AWS Pprof Idempotency

Go Developer

DataArt

Oct 2021 - Nov 2023 (2 years 1 month)

Optimized PostgreSQL queries and designed Go microservices with Clean Architecture and DDD. Built concurrent data pipelines and developed rate-limiting middleware.

Go PostgreSQL Redis Kafka Docker AWS gRPC REST Clean Architecture DDD Concurrency

Java Software Developer

May 2020 - Aug 2021 (1 year 3 months)

Decreased DB load by ~24% via indexing and query optimization. Developed JUnit/Mockito tests, increasing coverage from ~60% to ~90% and reducing bugs by ~34%.

Java 11 Spring Framework Spring Boot Hibernate PostgreSQL Junit Git