Professional contracts and long-term engagements — enterprise systems, telecom platforms, and email infrastructure.
Freelance Full-Stack Engineer / AI Integration · Mar — Jun 2026
Built out a modular, conversation-first sales CRM across 1,366 commits in 3 months — AI-powered reporting through a provider-fallback gateway (Gemini → OpenRouter), a deterministic decision-billing ledger, lead ingestion/enrichment pipelines, and org-level access control. ~123K LOC across frontend and edge functions, 201 test files, 23 production cron jobs.
Freelance Full-Stack Engineer / AI Integration · Mar — Jun 2026
Took over and substantially rebuilt a gym-cleaning operations platform after its no-code MVP stage. Delivered mobile-first cleaner workflows with AI photo validation, automated escalation triggers, and multi-provider LLM failover across 991 commits in 3 months — 42K LOC, 474 passing tests, zero npm vulnerabilities.
Solo Architect / Engineer / DevOps · Apr — Jun 2026
Conversational AI assistant (Telegram bot) for a Ukrainian application-writing consultancy. RAG + LLM fills Excel templates while preserving formula chains. 8-week solo delivery: 65 sessions completed, 100% Excel artefact validity, 22% escalation rate.
Freelance Backend Engineer / AI Integration · May — Jun 2026
Built a voice AI agent automating 80% of 20,000 monthly support calls for a micromobility company. Delivered in 24 days: Go backend, Binotel webhooks, Whisper STT, GPT-4o-mini function calling, ElevenLabs/Azure TTS, Redis session state.
Senior Software Engineer / Plugin Developer · Nov 2018 — May 2019
Developed enterprise DevOps platform components for CloudBees CD/RO serving Fortune 500 clients. Created 50+ reusable plugins in Java, Groovy, and Perl, reducing code duplication by 60% and achieving 95% automated test coverage.
Team Lead / Senior Backend Developer · Mar 2013 — Mar 2018
Led Kyiv development team for 5+ years building core components for PortaSwitch BSS, Billing, and Softswitch platform serving MNO/MVNO/MVNE, cable, VoIP, and IoT providers. Architected billing solutions with 99.9% system reliability.
System Architect / Head of System Development Department · Jun 2011 — Jun 2014
Architected complete redesign of enterprise email platform mail.ua serving 1M+ active users. Managed 20+ backend engineers through 3-year platform transformation, transitioning from Waterfall to Agile with automated testing pipelines.
