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Apps & Engineering Projects

Over 10+ years in software engineering, I have designed, built, and maintained production systems across cloud backends, developer utilities, automated messaging bots, and distributed infrastructure. Below is a curated directory of public applications and technical implementations.

Web Utilities & Microservices​

Production client-side utilities and serverless microservices with live interactive tools and architecture documentation.

  • JWT Secret Key Generator (Docs) — A specialized developer tool for generating high-entropy secret keys for JWT signing with multi-format support.
  • Strong Password Generator (Docs) — A secure microservice for generating highly random and strong passwords with full control over character sets and length.
  • QR Code Generator (Docs) — A microservice for generating standard QR codes via a simple API.
  • Barcode Generator (Docs) — A microservice for generating various types of barcodes via a simple API.
  • Link Redirect Tracer (Docs) — A fast, accurate tool to trace the full, step-by-step path of any redirected or shortened URL.
  • Domain Lookup Tools(WHOIS & DNS Information) (Docs) — A comprehensive web tool for instant WHOIS, registration, expiration, and technical DNS status lookups.
  • Image Comparison Creator (Docs) — Free browser-based tool to combine two images side-by-side with Before/After, VS, Now/Then, or custom text labels.
  • Online GZIP Compressor (Docs) — A client-side web tool for fast and private GZIP compression and decompression of files in your browser.
  • PasteDownloader (Docs) — A simple web tool that allows you to download images directly from your clipboard by pasting them.
  • ShrinkItPlease (Docs) — Compress your images seamlessly with a simple drag-and-drop. It's fast, efficient, and dev-friendly.Reduce the weight of image up to 90%.
  • RandomStringGenerator (Docs) — A microservice for generating random strings with customizable options such as length, character types, and spaces.
  • NoBackgroundPlease (Docs) — A fast, seamless microservice for removing image backgrounds via API and interactive UI.
  • MetaCard (Docs) — Metacard is an API service for generating dynamic, social-media-ready thumbnail images for blogs and websites. API included.

Telegram Automation Bots​

Automated bots running on asynchronous Python backends, MTProto protocol wrappers, and high-concurrency event loops.

  • Base64_transform_bot — A Telegram bot offering Base64 encoding/decoding, quote replacement, curl-to-Python conversion, JSON formatting, and YouTube utilities for developers.
  • Building InstaResizerBot: Scalable Image Resizing for Instagram on Telegram Infrastructure — Technical architecture, Pillow canvas math, and state handling behind InstaResizerBot, a Python Telegram bot built for Instagram aspect ratio fitting.
  • Kick_and_ban_all_members_bot — A Telegram moderation bot for bulk purging regular group members using MTProto streaming, temporary bans, and FloodWait auto-recovery.
  • Post from Telegram to WordPress Bot — Automated Python server tool to publish blog posts and media directly from Telegram channels and chats to WordPress via REST API.
  • ResponseWithBarcodeBot — Generates barcodes from user input directly in Telegram chats using python-barcode and in-memory BytesIO buffers.
  • ResponseWithQrBot — Generates high-resolution QR codes from user input directly in Telegram chats using python-qrcode, Pillow resampling, and in-memory BytesIO streams.

Browser Extensions​

Client-side automation and developer productivity extensions built for Chromium engines.

Infrastructure & Distributed Platforms​

Cloud architectures, dynamic DNS services, and content delivery pipelines.

  • Hrekov.com Project — Hrekov.com is a comprehensive project focused on building a modern, scalable web platform. It serves as a showcase for innovative web technologies, best practices, and personal development in software engineering.
  • Serhii Telegram Bots Empire - Suite Architecture & Directory — Technical architectural guide, engineering decisions, and complete directory of the Serhii Telegram Bots Empire ecosystem, built by Serhii Hrekov featuring specialized developer bots for data transformation, QR/barcode generation, media processing, and central hub management via @serhiixxxbot.
  • Ddnames - Dynamic Domains for IoT Devices — A platform for managing dynamic domain names, tailored for IoT devices and personal infrastructure based on API, JSON, and PowerDNS.
  • Serhii Talks - Centralized Content Persistence & Telegram Broadcast Architecture — Comprehensive technical architecture and implementation details of serhiiTalks, an automated content aggregation and database fallback pipeline built by Serhii Hrekov with Python, FastAPI, PostgreSQL (Neon), Celery, and Redis.

Technical Credentials & Contact​

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