Backend developer & freelancer
I build backend systems, bots and AI integrations in Go, Java, Groovy and Perl, and take on select freelance work.
Scalable services and APIs in Go, Java, Groovy, TypeScript and Perl; CLI tools; database design and tuning.
Claude Code, Cursor, Aider; multi-provider LLM integration with failover; observability and evaluation.
Telegram bots with conversation flows, AI features, payments and monitoring; business workflow automation.
E-commerce and CRM integrations, catalog sync, site migrations and security cleanup.
reference-web-development
You show a site whose look and structure you like; I build a new one in the same spirit with your content and brand. First a written brief of the reference (layout, colour, type, spacing, breakpoints, motion), then the build, then a measured check against the reference at desktop and phone widths. Nothing of the reference's text, photos, logos or fonts is copied.
v2v-demo
A bilingual (UK/EN) voice-and-text AI concierge engine with three interfaces on one API — Telegram bot, Telegram Mini App (Voice-to-UI, server-owned cart, Telegram Stars) and web — running ten independent business assistants (dental, auto, real estate, cleaning, translation, beauty salon, barbershop, restaurant, pizzeria, acupressure shop) behind one inline picker, sharing a single grounding-gate core. An automated scenario-probe tool caught a real safety-relevant bug (a sedation request getting scheduled as a routine booking) before it reached a user. One main dependency. Live demo: @v2v_demo_bot on Telegram (Open Concierge opens the Mini App) and web.pere.org.ua.
vending-esp32-monobank
Lets a commercial Rheavendors coffee machine take Monobank QR payments directly, with no payment intermediary and no monthly fee: a Cloudflare Worker verifies each payment against the Monobank API and queues it in a per-machine Durable Object, and an ESP32 polls it and credits the machine through an optocoupler-isolated board on the coin connector. Acknowledged queue, no double payouts, the machine's own Ready state respected. Verified end to end on the customer's machine with real payments.
php-vulnerability-audit
Audit and patching for the critical PHP interpreter flaws CVE-2026-109618 and CVE-2026-109619 (PHP2Shell, fixed 21 Oct 2026): an inventory of every host and the PHP version its web server really serves, an upgrade to 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12, a vendor backport or a migration for end-of-life branches, temporary mitigations from the PHP advisory where the patch must wait, worker restarts, a check from the web side, a log review for exploitation signs and rotation of secrets that may have been exposed.
site-security-cleanup
Full recovery of hacked WordPress, Joomla and OpenCart sites: hidden mobile redirects, web shells and backdoors, spam injected into the database, Google Safe Browsing and hosting blocks. Isolated staging, diff against clean CMS cores, database sanitization, PHP 8.2+, no PHP execution in upload folders, 2FA, WAF and a Search Console review, with 100% data preservation.
tilda-migration
A turnkey move of a business site or online store off Tilda onto Horoshop, Weblium, WooCommerce or Shopify: the design and structure kept, a 301 redirect map for every URL, meta data carried over, Ukrainian payments and Nova Poshta connected, orders pushed to Telegram and the CRM, and the main domain switched with no downtime.
Specification-precision measurement tool for AI-driven software projects. Digitizes the 'fog' of a spec before AI agents turn it into architecture: deterministic requirement-traceability + constraint-density metrics, plus an LLM-instrument generation-spread metric, with a CI gate.
Per-project semantic search over Claude Code session history. Indexes JSONL transcripts into local SQLite; retrieves via bge-m3 embeddings (Ollama) with FTS5 BM25 fallback. No central store — every project's memory is isolated and append-only.
Open-source cross-agent plugin mesh connecting Claude Code, OpenCode, Gemini CLI, Codex, Cursor, and Kilo into a full 6×6 delegation network. One install gives any agent the ability to delegate tasks to the other five — parallel reviews, council mode, root-cause debugging.
AI-Powered Development combining Claude/Cursor automation and low-code tools (Supabase/Replit) to deliver scalable solutions in days. Launch MVPs, modernize legacy systems, and automate workflows faster.
Professional-grade custom Telegram bot powered by JavaScript/Go/Java for autoresponder efficiency and business automation. Supports lead generation, crypto bots, appointment booking, and e-commerce workflows.