Hi, I'm
Shaif Mohammad Reasat
Senior Software Engineer building performant mobile experiences with Flutter and native platforms. 5+ years across enterprise, white-label, and consumer products — from VPN and Web3 to e-commerce and real-time apps.
What I Bring
Cross-platform Mobile
Shipped Flutter apps to phone, tablet, macOS, Android TV, and Amazon FireOS. Native Kotlin, Java, and Swift bridges for protocol clients, payment SDKs, and ad SDKs.
Security & Networking
DPI bypass via obfuscated protocol clients (IPsec, V2Ray, WireGuard, OpenVPN). DNS-over-HTTPS, certificate pinning, encrypted private key management.
Payments & Web3
Bkash, SSL Commerz, Stripe, RevenueCat, Play Billing, StoreKit. Architected a non-custodial Web3 wallet on Polygon with fiat on/off-ramp integrations.
Product Thinking
Introduced analytics tooling (Microsoft Clarity, CleverTap), set up user feedback loops via Reddit and Telegram, and shipped 2-3 user-driven features per quarter.
Experience
Senior Software Engineer
Nagorik Technologies Ltd.
July 2023 – Present
- — Led white-label VPN product line for international clients
- — Architected Remit & Go — non-custodial Polygon wallet with encrypted keys and fiat ramps
- — Engineered obfuscated IPsec/V2Ray/WireGuard clients to bypass DPI in restrictive regions
- — Added DNS-over-HTTPS for secure resolution and API encryption
- — Built native VPN channels (OpenVPN/WireGuard/V2Ray) in Kotlin, Java, Swift
- — Shipped split tunneling, Always-On, and Kill Switch via an abstracted protocol layer
- — Optimized Google Ads + AppLovin across multiple mediation networks
- — Ported iOS to macOS (Swift + Flutter); shipped to macOS App Store
- — Shipped Android TV / FireOS builds; cut crash rates ~15%
- — Introduced Microsoft Clarity and CleverTap analytics; Crashlytics every release
- — Designed real-time voice messaging, calling, and voice rooms (WebSockets + WebRTC) for ChitChat
- — Wired Firebase auth (Apple/Google/Facebook) and push notifications across apps
- — Authored quarterly engineering blogs and feature docs for team knowledge sharing
- — Built Reddit + Telegram feedback loops; drove 2–3 user-led features per quarter
- — Mentored juniors via weekly reviews, pair programming, MVVM/testing/perf training
- — Migrated deprecated Flutter packages; built native AARs for 16KB + targetSDK compliance
Software Engineer
Nagorik Technologies Ltd.
Nov 2021 – June 2023
- — Refactored Romoni e-commerce — added shopping flow, Bkash/SSL Commerz, referrals, coupons
- — Integrated speech accuracy scoring and caption summarization into Tota; built model test system
- — Wired RevenueCat and Stripe for in-app purchases
- — Integrated native Play Billing and StoreKit for cross-platform payments
- — Built real-time matchmaking on Firebase Firestore
- — Designed real-time chat / voice / video features (WebRTC, WebSockets, FCM)
- — Owned release process across Google Play and App Store
Junior Software Engineer (CS MIS-SW)
PRAN-RFL Group
Dec 2020 – Nov 2021
- — Built PRG Snacks Cart (Native Android, Java) — employee ID barcode auth for factory food sales
- — Engineered Vision Warranty Plus — secure activation flows and automated claim processing
- — Built PRG Oil Dispatch — automated vehicle slip generation with DotNet APIs and OracleDB
Projects
15 apps shipped across enterprise, consumer, FinTech, security, and Web3 domains.
FinTech & Web3
Remit & Go
Non-custodial crypto wallet on Polygon with USDT/POL transfers and fiat on/off-ramp.
VPN & Security
EnovaVPN
Flagship VPN with obfuscated IPsec/V2Ray/WireGuard for DPI bypass.
SharkVPN
Native channeling for OpenVPN, WireGuard, V2Ray with cert generation.
RocketVPN
White-label VPN with store-compliant releases.
AudraVPN
White-label VPN client.
ZauberVPN
White-label VPN client.
E-commerce
Romoni
Refactored e-commerce app with Bkash/SSL Commerz, referrals, in-app feed.
Real-time & Social
ChitChat
Real-time voice messaging, calling, and voice rooms over WebRTC.
Ed-tech
Tota
Educational app with speech accuracy scoring and caption summarization.
Loyalty & Deals
DealFinder
Deal discovery with QR-based activation. CustomPainter UI for performance.
Consumer
Medha
Firebase auth (Apple/Google/Facebook), push notifications, Retrofit APIs.
Deen
Firebase auth, push notifications, REST API integrations.
Enterprise (PRAN-RFL)
PRG Snacks Cart
Native Android with employee ID barcode auth for factory food sales.
Vision Warranty Plus
Secure activation flows and automated warranty claim processing.
PRG Oil Dispatch
Automated transport vehicle slip generation with real-time logistics sync.
Skills
Languages
Frameworks & Platforms
Architecture & Patterns
State Management
Testing
Security
Networking & Real-time
Payments & Monetization
Backend / Cloud
Databases
Analytics & Monitoring
Deployment Platforms
Web3 / Blockchain
DevOps & Tools
Collaboration
AI Dev Tools
Education
Khulna University of Engineering and Technology (KUET)
Bachelor of Science in Computer Science and Engineering
2016 – 2020
IELTS C1 Certified
Get in Touch
Open to interesting opportunities and collaborations. Feel free to reach out.
Beyond Code
Leadership & Activities
- General Secretary — English and Career Club, KUET
- Workshop Manager — HACK (Hardware Acceleration Club), KUET
- Vice President — CYBORG (Cyber Gaming Club of KUET)
- Organizing Committee — Bitfest 2019 (2nd CSE Festival), KUET
- Program Coordinator — National High School Programming Contest (2016, 2017), Khulna Division
Achievements
- ★ Bangladesh Math Olympiad — Champion (2007)
- ★ Bangladesh Math Olympiad — Runner-up (2011)