Research & discovery
Customer interviews, competitive teardowns, technical spikes. I validate before I build, then keep validating after.
I'm Siarhei Sheleh — technical entrepreneur in Warsaw, registered in Poland as a sole proprietor. 13 years building and launching products used by millions, across mobile, desktop, and web. 7 of them are live right now. One inbox in the middle: [email protected].
I started shipping internet products in 2013, working as a product developer for clients in tech, agro, AI, and hardware. From 2015 to 2020 I worked on product, growth, and monetization at Muse (Ultimate Guitar) — the number-one platform for musicians, 350M+ users — building and monetizing the mobile apps and launching an AI-powered learning product. From there I started co-founding my own: eSIM Plus, Nicegram — the open-source, privacy-first Telegram client that passed 56M+ organic installs with no paid acquisition, now with Nicegram Business layering an AI business OS on top of it — WhatPlantIsThis, and Degenphone.
In 2024 I formalized everything under SV Lab. Today it runs Prowl (one MCP endpoint that hands any agent 408 market-intelligence tools), CheckMyData (an open-source NL-to-SQL agent), and PrivateClawd (a managed cloud for AI agents).
The newest thing out of the lab isn't a product for users — it's for builders. sshlg-skills takes everything I know about getting an idea to production — discovery, gated delivery, product marketing, onboarding, retention — and writes it down as skills a coding agent follows. It exists because agents left alone produce volume, not products: code nobody can ship, scale, or maintain. It installs into Claude Code, Cursor, Codex and a dozen other agents with one command.
What I own end to end is the full surface a product needs to exist: research, engineering, go-to-market, marketing, and operations. Most orgs split these across five roles and pay for every handoff. I run them as one loop — and ship faster because of it. That same loop is what I bring to consulting and AI transformation engagements.
Customer interviews, competitive teardowns, technical spikes. I validate before I build, then keep validating after.
TypeScript end-to-end: agents, data pipelines, payments, infra. I write the code that ships, not just the spec.
Positioning, pricing, launch, distribution, first 1,000 users. GTM runs as the same loop as the build.
Stripe billing, support, legal, vendor stack, analytics — the boring infrastructure that keeps a one-person company compounding.
A trimmed slice of the ledger. Want the full list? See all 11 →
Thirteen years of product judgement, installed into your coding agent.
Build · GTM · opsNicegram OS — the AI business layer for Telegram-native teams: company-owned accounts, delegated access, retained chat history, approved AI agents, CRM sync. In early access.
Co-founder · productChatGPT for your database.
Build · GTM · opsYour first AI employee, deployed in 60 seconds.
Build · GTM · opsOne MCP endpoint. 408 market-intelligence tools for your agents.
Build · GTM · opsNFT-backed eSIM phone numbers for Web3 users.
Co-founder · build · GTMWhether it's a tightly-scoped advisory sprint or a full AI transformation across your processes and org — I read every email and reply within one business day.