Shaikh Wasi Sadman

Senior Full-Stack Developer (Mobile-First - React Native / Expo) with 7+ years shipping 16+ cross-platform apps (iOS & Android) serving 200k+ users across fintech, ride-sharing, healthtech, and e-commerce. Expert in New Architecture (JSI, Fabric, TurboModules), Reanimated 3, offline-first patterns, modular/monorepo architecture, design systems, and CI/CD. Proven leader of cross-functional teams through architectural migrations and refactors.

• Development Lead, Senior Full-stack Developer (Co-founder) — U-Turn — Remote, BD | Jan 2023 – Present
• Developed an end-to-end Ride-Sharing system using React, Node.js, MongoDB, React Native, and a fully Dockerized infrastructure.
• Led cross-functional team with CI/CD pipelines, structured code reviews, and server management.
• Achieved 10,000+ trip requests, 8,000+ passengers, 2,000+ drivers with 25% retention rate.
• Implemented monitoring stack (Prometheus + Grafana).
• Managed Play Store/App Store releases. Built real-time bidding engine (Socket.IO) and Reanimated 3.
• Senior Mobile App Developer (React Native) — DevDec — Remote, CA | March 2025 – Present
• Lead developer for Coco (Recalls & Scam Alerts, consumer safety app). Architected solution using Ignite (By Infinite Red), Expo (bare workflow), Expo Router, TypeScript, MobX-State-Tree, and React Query. Atomic Design component system.
• Implemented RevenueCat SDK for In-App Purchases and Subscription Management across iOS and Android.
• Engineered robust Firebase synchronization; integrated Sentry for crash monitoring and performance tracking.
• Deep linking (universal links + custom URL schemes). Testing strategy with Jest and Maestro for critical flows.
• Optimized performance with profiling. Used Reanimated 3 with worklets for smooth animation in Camera and UX.
• Senior Mobile Engineer (React Native) — Orchid (Contract via Gun.io) — Remote, NZ | Sep 2024 – Feb 2025
• Migrated Sea-Flux from Ionic to React Native for cross-platform Web, iOS, and Android support.
• Built an offline-first caching layer using IndexedDB + Expo FileSystem, cutting 50–60% media requests to Firebase Storage.
• Engineered robust Firebase synchronization. Implemented MMKV for local storage and React Navigation v6+ with deep linking.

Senior React Native Developer — Sidqam Ltd (Direcht) — Remote, UK | May 2023 – May 2024

• Shipped production healthcare apps supporting 1,000+ elders in 10+ care homes: Direcht Learning Disability (Mobile), Direcht Care (Web), Direcht Wards (Web).
• Built feature-based modular architecture with Reanimated animations and shared design system; Detox E2E tests.
• Introduced Git Flow branching, Agile practices, and structured code reviews across a 5+ member cross-functional team.
• Senior Software Engineer (Mobile & Full-Stack) — Dotlines — Dhaka, BD | Jul 2019 – Mar 2023
• Led development of Sohoj, an international remittance platform used by 100k+ users across 7 countries with 2,000+ DAU and 22% retention. Used GraphQL, Redux Toolkit, and offline-first SQLite caching.
• Delivered major features for Audra VPN, Audra Security, Payment Gateway SDKs, LaoPay MFS, Jitsi-based AV calling, and Ghoori Learning (50k+ students). Built native Android (Java) and iOS (Swift) apps for Audra VPN.
• Managed Play Store/App Store releases with Fastlane CI/CD; mentored junior developers.

M.Sc. in Computer Science | June 2019 – August 2020 | Jahangirnagar University — Dhaka, Bangladesh

B.Sc. in Computer Science and Engineering | January 2014 – March 2018 | Patuakhali Science & Technology University — Patuakhali, Bangladesh