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boris User

@borisuser2

Senior Go Developer at Otto Group (limango), scaling Kafka pipelines to 18K msg/s and keeping flash-sale APIs under 80ms p99.

Portugal

Message

At Otto Group (limango), I scaled the flash-sale order and offer pipeline from 2K to 18K msg/s by repartitioning Kafka and fixing hot-key skew. I also kept the offer API below 80ms p99 at 9K RPS through two Black Fridays, with zero downtime.

At Text (formerly LiveChat), I owned Presence and Typing Indicators services supporting more than 1M concurrent WebSocket connections. Across these roles, I’ve worked on zero-downtime migrations and built AI tools for incident response and PR review.

Experience

Work history, roles, and key accomplishments

Current

Senior Go Developer

Current

Otto Group (limango)

Apr 2024 - Present (2 years 6 months)

Scaled order and offer pipeline for flash sales from 2K to 18K msg/s by repartitioning Kafka and fixing hot-key skew. Kept offer API at p99 under 80ms through Black Friday peaks and migrated 1B+ records to ClickHouse with zero downtime.

Go Kafka PostgreSQL Clickhouse Redis Kubernetes Prometheus Grafana Pprof MCP AI Assisted PR Review Incident Command

Golang Engineer

Text (formerly LiveChat)

Sep 2022 - Mar 2024 (1 year 6 months)

Owned Presence and Typing Indicators services on a platform with 1M+ concurrent WebSocket connections. Redesigned presence fan-out, cutting memory per connection by 25% while keeping p99 delivery under 100ms.

Go WebSockets Redis Distributed Systems Feature Gating Cross team coordination

Golang Developer

Yandex Market

Jul 2021 - Aug 2022 (1 year 1 month)

Built gRPC and HTTP endpoints for catalog services at a large marketplace. Doubled test coverage to 50%+ and cut issue detection time from ~30 to ~5min with metrics and Grafana dashboards.

Go gRPC HTTP Grafana Testing Metrics