• Built and shipped the investor mobile app to the App Store and Play Store: 25+ screens in React Native and Expo, covering KYC onboarding, portfolio, order placement and wallet. • Shipped a B2B partner module for investing on behalf of institutional clients, and an Auto-Invest flow scheduling recurring mandates on BullMQ with retry handling on failed debits. • Automated the mobile release pipeline with per-environment EAS profiles, auto-submit workflows and OTA updates, turning a 2-3 day store review into minutes for JS-only fixes. Release effort down ~85%. • Added biometric and PIN re-entry with expo-secure-store, hashed and device-bound, so an expired session resumes in under 2 seconds instead of a full OTP login. • Implemented Sign in with Apple end to end, verifying identity tokens against Apple's JWKS on Fastify and handling Hide My Email relay addresses when linking existing accounts. • Built cross-device force logout on a per-user revocation epoch cached in Redis, cutting ~95% of per-request identity provider calls.

• Rebuilt the dashboard's account and portfolio pages on the Next.js App Router, streaming from React Server Components and virtualizing tables to 5,000+ rows without pagination. Load time down ~40%. • Built the unlisted-share price chart, interpolating a continuous series from a sparse feed of real trade events, with timeframe switching and hover tooltips in Zustand. • Built multi-touch attribution in Prisma with first and last touch resolution and lazy backfill, taking channel coverage of new signups to ~100%. • Integrated PostHog for product events and error monitoring, and the Meta Conversions API with hashed identifiers, event deduplication and server-side purchase events from the payment webhook.