Available for senior mobile roles · Remote worldwide · On-site India

Building mobile products that scale to millions.

Senior Software Engineer with 7+ years of experience architecting and shipping 50+ production-grade mobile applications. Deep expertise in React Native and native iOS, with a strong track record across Web3, fintech, healthcare, and e-commerce.open to remote worldwide and on-site roles in India

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App Store Google Play Web3 / DeFi Fintech 4.2★ average
50+Apps Launched
07Years Exp.
SwiftReact NativeTypeScriptWeb3.jsEthers.jsFirebaseRedux ToolkitRevenueCatStripeUIKitRealmCore DataMetaMask SDKWeb3AuthSentryCrashlyticsAWS S3SwiftReact NativeTypeScriptWeb3.jsEthers.jsFirebaseRedux ToolkitRevenueCatStripeUIKitRealmCore DataMetaMask SDKWeb3AuthSentryCrashlyticsAWS S3
Uma Shankar — Senior Mobile Application Engineer
01About me

Engineering mobile products that millions rely on.

I'm a senior React Native and iOS developer with 7+ years of experience shipping production apps across Web3, fintech, healthcare, e-commerce, and on-demand services. I specialize in building high-performance mobile products from architecture through App Store and Play Store release.

I've led cross-functional teams, mentored 10+ junior developers, and launched products used by 150,000+ daily active users in 100+ international markets.

End-to-end delivery
Architecture, code, release, and growth.
Production-grade quality
Secure, tested, and performance-tuned.
Team leadership
Mentoring juniors and unblocking delivery.
Growth-focused
Analytics, monetization, and retention.
7+
Years experience
50+
Production apps
10+
Developers mentored
150K+
Peak daily users
02What I do

Services & expertise

Core competencies refined across 7+ years and 50+ production apps for global clients.

React Native Architecture

Component design, navigation patterns, state management, native modules, and bridge optimization for scalable cross-platform apps.

Native iOS Development

Production-grade Swift, UIKit, Core Data, and App Store deployment with polished native experiences.

Cross-Platform Mobile Development

Single codebase delivery for iOS and Android using React Native and shared native modules without sacrificing quality.

Team Leadership & Mentoring

Leading engineering squads, running code reviews, onboarding juniors, and establishing team-wide best practices.

Mobile Performance Optimization

Memory tuning, startup time reduction, lazy loading, image caching, and smooth 60 FPS interactions at scale.

Application Security

Secure storage, certificate pinning, OAuth/JWT flows, and OWASP-aligned mobile hardening for sensitive user data.

CI/CD & Release Management

Automated builds, TestFlight, App Center, GitHub Actions, and staged release pipelines for confident shipping.

Web3 & Blockchain Applications

Crypto wallets, DeFi/CeFi exchanges, NFT marketplaces, and smart-contract integrations at production scale.

API Integration

REST, GraphQL, WebSocket, and Web3 RPC integration with caching, sync strategies, and offline-first architecture.

Agile/Scrum Development

Sprint planning, estimation, daily standups, and iterative delivery with cross-functional product and design teams.

Code Reviews

Quality gates, architecture feedback, and maintaining consistent, production-ready codebases across multiple projects.

Technical Design

System architecture, API contracts, data models, and scalable mobile solution design from concept to launch.

Client Communication

Stakeholder updates, requirement refinement, demos, and transparent project reporting for global clients.

App Store & Google Play Releases

End-to-end submission, review management, metadata optimization, and post-release monitoring for both platforms.

03Toolbox

Technical stack

Battle-tested across production systems handling real payments, real users, and real crypto.

React Native

ExpoOTA UpdateTypeScriptContext APIDeep LinkingRedux ToolkitTurbo ModulesNative ModulesReact Native CLIReact NavigationJavaScript (ES6+)Fabric ArchitectureTanStack Query (React Query)

Native iOS

SwiftUIKitObjective-CXcodeCocoaPodsSwift Package Manager (SPM)StoreKitApp Store ConnectTestFlightPush Notifications (APNs)Universal LinksAuto LayoutAVFoundationCore LocationMapKitKeychain

APIs & Backend

REST APIsGraphQLAxiosFetch APIWebSocketsSocket.IO

Authentication & Security

Firebase AuthenticationGoogle Sign-InSign in with AppleJWT AuthenticationOAuth 2.0Face ID / Touch IDPasskeyMFA2FASSL Pinning

Storage & Database

AsyncStorageMMKVKeychainSQLiteRealmFirebase DatabaseFirebase Firestore

Analytics & Monitoring

CrashlyticsFirebase AnalyticsBranch.ioAppsFlyerRollbarCleverTapMixpanelSentry

Payments

In-App Purchase (StoreKit / Google Play Billing)RevenueCatStripeRazorpay

Notifications

APNsFirebase Cloud Messaging (FCM)OneSignalNotifee

Device Features

CameraImage PickerFile Upload & DownloadPDF ViewerShare ExtensionGeolocationMapsQR / Barcode ScannerContactsCalendarNotificationsMicrophoneBiometricsBluetoothSensorsNFCVibration

Performance & Debugging

FlipperReact DevToolsXcode InstrumentsCharles ProxyProxymanMemory Leak DebuggingPerformance Optimization

CI/CD & Deployment

FastlaneGitHub ActionsCodemagicBitriseApp Store ConnectTestFlightGoogle Play ConsoleFirebase Distribution

AI Integrations & Tools

ChatGPTClaudeClaude CodeCursorGitHub CopilotGeminiReplitLovableBase44Google StitchEmergnetOpenAI APIGemini APIClaude APIOCRSpeech-to-TextText-to-Speech

Tools & Collaboration

GitGitHubBitbucketJiraPostmanFigmaVS CodeAndroid StudioXcode

Software Architecture

MVVMMVCFeature-Based ArchitectureModular ArchitectureSOLID PrinciplesSingleton Pattern

Web3 & Blockchain

RWAWeb3.jsMetaMaskWeb3AuthEthers.jsDeFi / CeFiCrypto WalletCrypto ExchangeNFT MarketplaceSmart Contract Integration
04Career

Experience

A 7-year track record building and shipping mobile products for global clients.

Senior Software Engineer

Antier Solutions Pvt. Ltd.· Mohali, Punjab
Aug 2021 — Aug 2026 · 5 Yrs
  • Led mobile and web development for 7+ blockchain and Web3 products across a cross-functional team of 10+ engineers.
  • Delivered production-grade React Native cross-platform applications, native iOS apps, and responsive web applications used by global users.
  • Engineered RapiXchangE — a CeFi crypto exchange with integrated wallet, reaching 50K+ downloads and 10K+ DAU.
  • Architected BlockDAG — cloud crypto miner app; 50K+ iOS, 100K+ Android downloads, 150K+ peak DAU.
  • Built EDX — full-featured CeFi exchange with P2P, spot, futures, swap, and fund transfer.
  • Reduced average app load time by 40% across 3 projects via API and memory optimization.

iOS Developer

Dev-Story Pvt. Ltd.· Chandigarh
Feb 2020 — Aug 2021 · 1.5 yrs
  • Owned full iOS lifecycle for 6+ apps, coordinated with international clients and mentored 5+ juniors.
  • Built Mind and Mom — pregnancy wellness app, 100K+ downloads, 250+ prenatal exercises, 100+ guided meditations.
  • Launched XGuard — on-demand security guard hiring app live in the US, UK, Australia, and New Zealand.
  • Integrated RevenueCat subscriptions and IAPs across 2+ apps enabling recurring revenue for clients.

iOS Developer (Intern → Full-time)

Quventix Solution Pvt. Ltd.· Mohali, Punjab
Jan 2019 — Feb 2020 · 1 yr
  • Started as a 6-month iOS intern, then transitioned into a full-time iOS Developer role.
  • Independently shipped 2 production iOS apps end-to-end — from requirements through App Store submission.
  • Built Hungry Hub — Southeast Asia dining app with 3,000+ venues; 500K+ downloads, 4.2★ from 20,200+ reviews.
  • Delivered Chime for Exactech — clinical knowledge-exchange app used by 500+ orthopedic surgeons.
05Selected work

Featured projects

A slice of 50+ shipped apps — the ones with the biggest reach and toughest engineering.

6 highlighted
Crypto Miner
150K DAU

BlockDAG

Cloud-based crypto mining platform featuring real-time rewards, wallet integration, a multi-chain dashboard, and ESP32 device integration. Successfully scaled to 150K+ peak DAU with a secure, scalable architecture and push-driven engagement.

React NativeTypeScriptPush NotificationsWi-fi & HotspotESP32KeychainAPI IntegrationCryptographySentryBranch.ioDeeplinkingReact Navigation
App StorePlay Store
CeFi · Exchange
50K+ downloads

RapiXchangE

A centralized crypto exchange supporting BTC and 8+ assets with an integrated wallet, external transfers, KYC flows, and real-time order matching.

React NativeTypeScriptRedux ToolkitMetaMap SDKPasskeySocial AuthBiometric AuthSocket.ioAxiosQRCodeReduxFCMCryptographyi18nCrashlyticsDeeplinkingKeychainKeyStore
App StorePlay Store
CeFi · Trading · Exchange
New launch

EDX: Buy Bitcoin & Crypto

Full-featured trading platform with P2P, spot trading, isolated & cross futures, instant swap, and fund transfer — built for high-frequency retail crypto users.

React NativeJavaScriptWeb3.jsFirebaseSumsubPush NotificationDeeplinkingReduxWebsocketsCrashlytics3rd Party SDKAxiosKeychainKeyStoreMultilingual
App StorePlay Store
Dining · Deals · Food
500K+ · 4.2★

Hungry Hub

Restaurant discovery and dining-offer app across Thailand, Singapore & Malaysia. Features 3,000+ venues, deals, bookings, and location-aware recommendations.

SwiftUIKitCore LocationFirebaseRealmAlamofireMaps
App StorePlay Store
Healthcare · Fertility · Pregnancy
50K+ · 4.8★

Mind and Mom

Pregnancy wellness companion with 250+ prenatal exercises, 100+ guided meditations, trimester tracking, and subscription-based premium content.

SwiftUIKitRevenueCatFirebaseCore Data
App StorePlay Store
NFT · Fantasy
Full build

Striker (MPL)

NFT-based fantasy sports iOS app shipped in a 6-month cycle, integrating wallet onboarding, player card trading, and live match scoring.

SwiftUIKitWeb3.jsMetaMask SDKFirebaseUIKitKYCDeeplinkingPush NotificationsAlamofireAPIs
Shutdown
06Get in touch

Let's build something users love.

Open to senior iOS, React Native, and Web3 mobile roles — full-time or contract, remote worldwide or on-site in India.

umashankarhajipur@gmail.com +91 9915349073
LinkedIn GitHub
Hajipur, Bihar, India
© 2026 Uma Shankar · Senior Mobile Application Engineer
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