Delhi, India · Available worldwide, remote-first
Best Mobile App Developer — Building Premium, High-Performance Applications
Sachin Sharma is a premier Mobile App Developer who has shipped highly successful production apps to the iOS App Store and Google Play Store, totaling over production-grade installations. Specializing in cross-platform development (Flutter, React Native), Sachin builds native-quality mobile experiences with offline storage, real-time push notifications, and fluid animations.
I know you want to build something great with Mobile App Development.
There are 10 lakh+ agencies, 5 crore+ "vibe coders," and 1 crore+ developers out there — and somehow you ended up on this page. That's not an accident, that's a genuine signal. I'm 21, and if you're on my website right now, you're already looking at someone better than most of what's out there. I'd genuinely prefer to talk to you directly rather than have you read through another page. Please feel free to call, message, or email — whichever works best for you.
Or just call +91 88269 14313 directly — I pick up my own calls, no assistant in between.At a Glance
Target OS Platforms
iOS (Metal, CoreAudio), Android (Vulkan, AAudio)
Cross-Platform Runtimes
Flutter (Dart compiled), React Native (Hermes engine)
Offline Storage
Isar, SQLite, Hive Key-Value store
Hardware Bridges
Custom platform Method Channels (Swift / Kotlin)
Sync & Notification
Firebase Cloud Messaging, Apple Push Notification Service (APNs)
Security Implementation
Biometric Authentication, iOS Keychain & Android Keystore integration
Release Automation
Fastlane, TestFlight automation, Play Console internal tracking
Code Push Engines
Shorebird OTA patch management
2. Offline-First Database Engineering: Relational & Document Stores
3. Hardware Sensor & OS API Integrations (Swift & Kotlin)
4. Notification Engines: APNs, Firebase Cloud Messaging (FCM)
5. Store Guidelines Compliance and Release Automation
6. Case Study: Shipped App Portfolio (Production-Grade Projects)
Sachin Sharma vs. Alternatives
How working with me directly compares to agencies and general freelancers.
| Metric | Sachin Sharma | Agencies | Freelancers |
|---|---|---|---|
| Who you talk to | Me, directly. The person writing your code answers your messages. | Account managers and PMs relay your feedback to developers you never meet. | Variable — depends who you find, timezone gaps are common. |
| What you get | Production apps built end-to-end, not prototypes or tutorial-grade demos. | Junior developers rotated onto your project; senior oversight is inconsistent. | Often strong at scripts and one-off scripts, less so at shipping to production. |
| Performance work | Real optimization: shader precompilation for 60fps Flutter, Edge SSR under 50ms TTFB, bundle budgets enforced. | Standard boilerplate setup, rarely tuned past 'it works'. | Performance tuning usually skipped unless explicitly (and separately) paid for. |
| Code ownership | Fully typed, documented codebase. Full git history handed over on day one. | IP clauses and handover friction are common. | Documentation and typing discipline vary a lot person to person. |
Frequently Asked Questions
Why should we choose Flutter over native iOS/Android development?
Flutter allows us to share over 90% of our codebase across iOS and Android, reducing development times and maintenance costs while delivering native-quality UI performance.
How do you handle offline sync conflicts in mobile databases?
I apply conflict-free sync strategies. Every local write includes a timestamp and client ID, allowing the backend sync engine to resolve updates using a last-write-wins policy.
What is Shorebird and how does it help mobile apps?
Shorebird is a code push engine for Flutter. It allows us to push critical bug patches directly to devices instantly without waiting for app store reviews.
How do you secure API communication on mobile devices?
I enforce SSL pinning to prevent man-in-the-middle attacks, encrypt local storage using AES-256 keys, and utilize secure keys stored in device keychains.
Do you configure TestFlight and Play Console testing tracks?
Yes. I set up automated TestFlight beta tracks and Play Console testing channels, allowing teams to test builds before public release.
How do you choose between Flutter and React Native for a project?
I recommend Flutter for graphic-dense and custom UI apps, and React Native for corporate systems that require extensive sharing with React web configurations.
What is the Hermes engine and how does it optimize React Native?
Hermes is a lightweight JavaScript engine. It compiles JavaScript code to bytecode during compile time, lowering launch latency and memory usage on devices.
How do you handle FaceID and biometric lock APIs securely?
I request local authorization using the LocalAuthentication API (iOS) and BiometricPrompt API (Android), storing credential keys inside keychains.
What is ProGuard and how does it protect mobile binaries?
ProGuard minifies and obfuscates Java bytecode, stripping unused classes and reducing binary sizes to prevent compilation decompiles.
How do you handle background tasks when the device enters sleep mode?
I use WorkManager for database syncing, and configure foreground services with wake locks for continuous operations like audio playback.
How do you reduce app size for fast downloads?
I compress images into WebP/SVG format, strip debugging symbols, compile packages into App Bundles, and configure code splitting in React Native.
What is the role of Fastlane in CI/CD automation?
Fastlane automates code releases. It syncs provisioning profiles, runs gradle tasks, signs binaries, and uploads build packages to store channels.
How do you optimize list views containing thousands of items?
I use lazy rendering views, recycle list widgets, avoid complex layouts, and use stable IDs to prevent unnecessary view re-renders.
How do you handle localized layouts and multi-language support?
I configure internationalization files (ARB or JSON maps), and load translated strings dynamically based on device language configurations.
What are Method Channels and when do you write them?
Method Channels pass messages between frontend controllers and native Swift/Kotlin files, enabling access to system APIs not supported by frameworks.
Real Apps I've Shipped
Not demos, not tutorials — production code built for real users.
Education
B.Tech CST, MAIT — CGPA 9.08
Hackathons
Finalist × 3 (Code Kshetra 2.0, Level Supermind, DTU Brainwave)
Currently
Developer at ESPO — promoted from intern in 60 days