A small studiowith senior hands.
Tacklebear is the studio of Konstantin Borimechkov, an engineer and founder from Sofia who builds software for businesses the same way he builds his own products.
Why Tacklebear exists
Before he wrote code for a living, Konstantin waited tables for two years. He saw how much of a working day goes to everything except the customer, and how rarely the software in the room helped.
Since then he has built systems used by more than a million people at Tide, shipped AI agents as founding engineer at a Y Combinator startup, and co-founded Menugram, a platform that now runs restaurants, bars and hotels across Bulgaria.
Tacklebear takes that experience to other businesses. That means senior engineering, honest scoping, and software judged by what it earns or saves.
How we work
- Fast, without cutting corners
- We ship in weeks what agencies quote in months, with clean, maintainable code you own.
- Product-minded engineering
- We have founded and run products ourselves, so we care about outcomes and conversion as much as code.
- AI where it actually helps
- From automations to LLM features, we use AI where it saves time and money.
Experience
Tacklebear
Founder, client work and products
Menugram, Vilichki and Codivise at the core, plus client websites, platforms and AI products.
2023 to now
BVNK
Senior Software Engineer, Trading
Building the trading orchestrator behind one of the largest stablecoin payment systems.
2025 to now
Mandel AI
Founding Engineer (YC S23)
AI agents and data-extraction workflows on LLMs, with tracing and observability.
2025
Tide
Software Engineer
Scaled invoicing to 100k+ users and designed P&L reporting APIs for 1M+ users. Engineer MVP award within seven months.
2022 to 2025

Axway
Software Engineer Intern
Java engineer on SecureTransport, a managed file transfer product.
2021 to 2022
Products we've launched
MenugramOne platform for every venue in Bulgaria.Codivise AIAn AI co-pilot for technical interviews.
- YC Hedge FundA global intelligence engine, built in two days.
ExploreYCEvery Y Combinator company, searchable.
FastScreen.ioAI candidate screening for hiring teams.VilichkiHeritage houses in Bulgaria, found in plain words.
Writing and resources
AI Engineering Playbook
How YC Hedge Fund was built in two days with AI-agent orchestration: workflow, prompts and architecture.
LinkedIn, building in public
4,000+ followers. AI agents, prompting, MCP and lessons from shipping products.
DDIA chapter summaries
Chapter-by-chapter summaries of Designing Data-Intensive Applications, with hand-drawn diagrams.
System design notes
Notes and diagrams from Alex Xu's System Design Interview, open to everyone.
Got somethingto tackle?
Tell us what you need. You'll hear back within 24 hours with next steps and a ballpark price.
