Building production systems end-to-end: smart contracts, backend, infra, payments, desktop clients.

TypeScript · Tolk · Python · NestJS · FastAPI · PostgreSQL · Docker · Electron

Open-source protocol that solves TON's core constraint: wallets can't be debited without owner signature. ORBIT uses a deposit model — subscriber funds a personal smart contract once, then charges happen automatically every billing period.

• 4 smart contracts in Tolk: Registry · Factory · Subscription · FeeCollector
• Supports native TON and any TEP-74 Jetton (USDT, USDC, etc.)
• 83 tests across security, integration, registry, and fee-collector suites
• 23 documented security properties — replay protection, double-charge guard, timelock withdrawals
• TypeScript SDK: Blueprint wrappers, deploy scripts, charge relayer with WAL + exponential backoff + webhook delivery
• Full docs: whitepaper, integration guide, threat model, keeper network spec, bytecode hash registry

Tolk · TypeScript · Blueprint · TON SDK · Jest · License: BUSL-1.1 → MIT 2029

Complete VPN service built solo: Telegram bot onboarding, recurring billing, native desktop clients, 4 VPS nodes. 2,500+ users.

• Telegram bot (aiogram 3.x + FSM) + FastAPI webhook layer + Redis-backed workers
• YooKassa recurring payments: tokenized cards, auto-charge 3 days before expiry, signed webhooks
• Native clients for Windows / macOS / Linux on Electron + Vite + React + Zustand + TypeScript
• sing-box VPN core embedded; auto-update via electron-updater
• AES-256 (Fernet) encryption of credentials at rest; per-user data isolation

Python 3.11 · FastAPI · aiogram 3 · SQLAlchemy 2 · PostgreSQL · Redis · Docker · Electron · TypeScript

Unified merchant API over 9+ payment providers (Stripe, Adyen, PayPal, Checkout.com, Mollie, Rapyd, PayU, Razorpay, NowPayments). Strategy/Adapter pattern, per-merchant idempotency, FX-normalized commissions, signed webhooks.

NestJS · TypeScript · Prisma · PostgreSQL · Next.js

• orbit-ton — Recurring subscription billing protocol on TON blockchain (Tolk · TypeScript · 83 tests)
• shield-vpn-backend — VPN-as-a-service backend — Python, FastAPI, aiogram 3.x, 2,500+ users
• shield-vpn-desktop — Native desktop clients — Electron + TypeScript + sing-box core
• skiba-hub — Multi-provider payments hub — NestJS, TypeScript, 9+ PSPs
• shield-releases — SHIELD VPN release distribution (macOS · Windows · Linux)
• homebrew-shield — Homebrew tap for macOS installation

Production code is private. Architecture docs and code samples in each repo.