Samih

Independent · tadjena.shop · tadjena.store

• Built an offline-first point of sale in Flutter/Dart for Windows, Android and web on SQLite; a sale never depends on connectivity.
• Designed an idempotent sync engine: append-only ledgers merge by UUID, editable data is last-write-wins, pulls use per-table watermarks.
• Wrote the Supabase/Postgres backend: 28+ migrations, row-level security, SECURITY DEFINER RPCs, per-device authentication, dev-to-prod pipeline with a manual production gate.
• Shipped a server-rendered Next.js 16 marketplace with reserve-for-pickup, a real-time household cart, and a license storefront with admin.
• Operate it: encrypted nightly backups with a verified restore (29/29 tables), hourly health checks, checksummed Windows and Android releases (v1.0.0, Sep 2026).
• Wrote importers to migrate shops from OpenSourcePOS/MySQL and a Delphi/Firebird system.

Independent · github.com/samdotbin/martin

• forex_rl_v4: graph encoder over 28 pairs and 8 currencies with a PPO policy, walk-forward folds, deflated Sharpe, bootstrap intervals and stress tests.
• A safety layer (exposure caps, max-hold, volatility circuit breaker, VaR cap, forced flatten) that runs identically in training and inference.
• QTrader and TQLearning: tabular Q-learning experts in native MQL5 for MetaTrader 5. QTrader masks illegal actions instead of learning to avoid them. Both document their status plainly. Research only.

Independent

• Expo and Next.js monorepo with a hybrid local/server ledger: idempotency, an offline queue and reconciliation.
• C core compiled to WebAssembly with Emscripten, wired into a Telegram Mini App demo on Vercel.