Looking for a job

Bogdan Kolesnyk

@bogdankolesnyk

Message

I build high-traffic serverless APIs and production LLM features for enterprise customers.

Ukraine

Message

What I'm looking for

I'm looking to build and operate high-throughput, event-driven backend systems, especially where reliability, data performance, and practical engineering ownership matter.

I've built and operated production software for nine years, including high-traffic serverless backends and LLM features for enterprise customers. At Shelf, I improved Lambda, PostgreSQL, and document-search performance while shipping permission-aware agentic search and asynchronous extraction systems at scale.

I independently built Poix, a commercial YouTube data API serving roughly 1.4M requests per day with 99.93%+ availability, using Cloudflare Workers, D1, Durable Objects, Queues, Hyperdrive, TiDB, and Stripe. I also built Lumo end to end, including a fault-tolerant eSIM purchase and provisioning flow and an LLM content pipeline with verification and human review.

Earlier, I delivered Next.js and TypeScript products for Bite and client storefronts for SoloMono, mentoring frontend developers and translating design intent into shipped work.

Experience

Work history, roles, and key accomplishments

Senior Backend Engineer

Shelf

Aug 2021 - Aug 2026 (5 years)

Led backend initiatives including a named-entity extraction pipeline and an agentic document-search assistant, optimizing performance and establishing documentation standards.

TypeScript AWS Lambda SNS Step Functions PostgreSQL LLM OpenAI Anthropic Gemini

Backend Engineer

Shelf

Aug 2021 - Aug 2026 (5 years)

Worked in cross-functional teams on an enterprise knowledge management platform, optimizing Lambda cold starts and building LLM-driven extraction and search features.