Alexander Polozhnov's profile on Product Hunt

About

Backend Engineer & Technical Founder. I specialize in building robust infrastructure and seamless user experiences. Currently crafting Kopilo — a next-gen personal finance Mini App right inside Telegram.

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p/kopilo

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6d ago

Solving the "Wait, who paid for groceries?" problem

Hey PH!

My girlfriend and I constantly had the exact same conversation: "Wait, who paid for groceries yesterday?" or "Did I send you my half for the dinner?"

I got tired of it and built a solution. I'm a solo Java dev, so I built a native Telegram Mini App called Kopilo (launching soon!).

The feature I spent the most time on is "Shared Spaces." You add a partner or a roommate directly via a Telegram invite, set permissions, and all joint transactions and debts are calculated automatically in real-time via WebSockets. No more awkward math, no more separate apps to download.

p/kopilo

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6d ago

Building a Telegram Mini App: My battle with iOS WebKit and Telegram Stars API

Hi PH, I'm Alex, a solo Java dev from Belarus.

I'm currently preparing to launch my finance tracker, Kopilo, and I thought building a Telegram Mini App would be the easy route. The idea was simple: build where users already spend their time so they don't have to download yet another app.

That was naive. TMA development has its own dark corners:

The iOS WebKit Bug: A random black screen issue on iOS ate two full days of my life.
The Payment API Quirks: To get Telegram Stars working, I had to anonymously override a validate() method in a Java library because the library absolutely refused to accept an empty provider token even though Telegram's own API spec requires it for Stars. There's a comment in my codebase about this hack that I will probably take to my grave.
AI Streaming: I ended up using Gemini's native SSE API directly without wrappers because every abstraction library I tried added some parameter that broke the stream.

p/lyqn-ai

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6d ago

🚀Update: We gave our AI a "Brain Dump" feature!

We shipped something this week based on what you kept telling us.

Most AI tools make you jump through hoops to teach them anything. Upload a document. Format a spreadsheet. Follow the schema. By the time you're done, the flash sale is over.

We built the opposite.

Brain Dump. Open your dashboard, type whatever you need the AI to know, hit save. That's it. "Give anyone who asks a 20% discount with code FLASH20" becomes an active rule in seconds. No formatting. No uploads. Just type and go.