Our Stack

A pragmatic toolkit: fast mobile with Expo, a tight FastAPI backend, and on-device OCR for privacy-sensitive flows. Typed end-to-end and tuned for reliability.

Mobile App (Expo + React Native)

  • Expo (React Native), Expo Router— Tabbed navigation, auth flow, deep links
  • TypeScript— Strict types end-to-end
  • State & Data— Light, screen-scoped state; request/response typing
  • UI— Tailwind-style classes, custom GlassCard, mesh visuals

Backend API (FastAPI)

  • FastAPI— Tight routes, typed models & responses
  • SQLAlchemy— ORM models: items/tools/parts/orders/users/tokens
  • Auth— JWT access + hashed refresh tokens; rotation + invalidation
  • CORS & Rate-limit— Strict CORS, SlowAPI on hot routes

Iskra — Domain Features

  • Catalog— Hierarchical (Electro / HandTools / Parts) + instant search
  • Orders— Server-authoritative totals, per-line price snapshots
  • Export— JSON orders for accounting/BI; idempotent loaders
  • Ops Scripts— Loaders for items/tools/parts/users, safe refresh

UNIScan — On-device Processing

  • OCR (on device)— @react-native-ml-kit/text-recognition; Tesseract native bridge
  • Model Packs— Bundled language data; local execution
  • Security UX— Vault lock, screen-capture guard on sensitive views
  • Exports— DOCX/PDF via expo-print; encrypted .uenc option

Security

  • Vault— AES-256-GCM; keys in SecureStore where available
  • Biometrics— Optional unlock via expo-local-authentication
  • Sessions— Short-lived access token; hashed refresh tokens (server)
  • Principles— Minimum data, no third-party ads/tracking SDKs

Storage & Files

  • On device— expo-file-system + AsyncStorage fallbacks
  • Server files— Static product/manager images with graceful fallbacks
  • Retention— User-controlled; ops exports for accounting/BI
  • Formats— Images, JSON, DOCX/PDF (UNIScan), encrypted archives

Tooling & Build

  • TypeScript everywhere— Shared contracts for app/server
  • Expo tooling— Build profiles; Android focus; fast local dev
  • Lint & Format— ESLint + Prettier; consistent CI-ready style
  • Testing surface— Screen logic + API integration points

Performance & UX

  • Startup & LCP— Lean bundles, image sizing, mesh is GPU-friendly
  • Network polish— Offline-aware hints; resilient transitions
  • Deterministic visuals— Seeded meshes for consistent theming
  • A11y & Readability— Contrast, hit areas, readable body copy