Mykyta Kalchevsky
Offer Mykyta work on your next project.
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Kharkiv,
Ukraine
5 days 7 hours back
available for hire
age 41 years
on the service 2 years
Rating
Successful projects
Average rating
Language proficiency level
Українська: fluent
English: pre-intermediate
Skills and abilities
Programming
Services
Portfolio
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Multi-tenant infrastructure: 4 production-bots on one $5 drop
DevOps
4 production Telegram bots co-located on one DigitalOcean droplet (1 GB RAM, 1 vCPU) through isolated screen sessions. Modular skills directory — each capability is isolated and customizable for each client.
11 days uptime, 0 incidents, load average 0.00.
… Features:
- Skill-based modular design — database, messaging, logging, approval
- Approval workflows for human-in-the-loop scenarios
- Fleet management: 4 production bots on one droplet, isolated screen sessions
- Reliability proven — production uptime measured in days, not hours
Stack: Python · LangChain · ChatAnthropic · screen · cron · modular skills architecture
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Modular AI assistant in Telegram (9 modules, Claude + Python)
Bot Development
Telegram bot with 9 modules, where Claude parses natural language into structured data. The user writes "ate 200g of chicken" — the bot calculates calories and macronutrients. Writes "spent $40 on gas" — categorizes it under finances.
Modules:
- Nutrition (Mifflin-St Jeor formula, personal macronutrient goals)
… - Finances (categories, monthly statistics)
- Schedule and reminders (timezone-aware)
- Monitoring Copart auctions (polling every 2 hours)
- Shopping list, tasks, weight, settings
Reliability: weekly automatic SQLite backups via cron, auto-restart at reboot.
Stack: Python · Claude Haiku · SQLite · python-telegram-bot · cron
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Online store on React + Firebase (441 products, live)
Website Development
Full cycle of developing an online store for edible bouquets — from design to production. 441 products, custom admin panel, real-time orders.
What has been done:
- Custom admin panel for managing products, prices, orders
… - Real-time Telegram notifications to the operator about each order
- 3 payment systems: Monobank, IBAN, PayPal
- SEO: Google Search Console + Merchant Center, sitemap, SSL grade A
- Lightbox for photos, filters, categories, multi-currency
Live: https://apelsin-rozmarin.com.ua
Stack: React · Vite · Firebase (Firestore, Auth, Hosting) · Telegram Bot API · Monobank · PayPal
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Production Telegram bot for ECU service with Claude AI (Glendale, C
AI & Machine Learning
Telegram bot on Python + Claude Haiku API for automotive ECU service in Glendale, CA. Database with 16,003 records about ECU modules.
Clients send car make and part number — the bot processes the request in natural language through Claude, returns the reprogramming method, price, and reserves the service.
… Features:
- Bi-directional architecture: client-facing bot + admin management panel
- Production deploy: Ubuntu droplet on DigitalOcean, screen sessions, cron auto-restart every 6 hours
- Lean: 89MB RAM, runs on $5 droplet
- Tuned Claude API: temperature 0.1, prompt+DB chunking — 0 errors on large context
Stack: Python · python-telegram-bot · Claude Haiku API · openpyxl · DigitalOcean · Linux/cron