I build production backends and AI systems that ship: FastAPI services, LLM voice agents, RAG, and real-time pipelines.
Key-based access leaked revenue and blocked recurring billing. I moved it to a metered subscription model with clean upgrade paths and reliable webhooks, without downtime for existing users.
Outbound teams burned hours on dead leads. An LLM agent with answering-machine detection and live human transfer qualifies and routes calls end to end.
A seller was losing to faster competitors. A FastAPI bot with proxy rotation and scheduled scans reprices automatically.
Price gaps close in milliseconds. A WebSocket pipeline ingests and reacts to market feeds with low-latency async processing.
“Add AI on our own docs, no hallucinations.” Retrieval-augmented chatbots with vector search and chunked ingestion, served behind FastAPI.
Also shipped: monolith → microservices · on-chain screener (Arkham/Nansen) · 17+ Telegram & Discord bots
A Finder Quick Action that turns Word, Excel and CSV files into native Google Docs and Sheets in one click.
View project →I'm a Python backend and AI engineer with 4+ years building production systems: FastAPI and Django services, real-time data pipelines, and LLM integrations across OpenAI, Claude and ElevenLabs.
I work end to end: from a fragile monolith to stable microservices, or from “we should add AI” to a monitored feature in production.
“Oleksandr did an excellent job on this project. He delivered everything professionally, on time, and with great attention to detail.”
“Oleksandr was very knowledgeable and efficient with this project. Very grateful to have his help and will definitely hire him again.”
“Oleksandr is excellent! He jumped on our project and found and fixed our problem in a couple of hours, after we had spent a week looking for it. I wouldn't go anywhere else now.”