Delhi, India · Available worldwide, remote-first

Best App Developer — Shipping Native-Quality Multi-Platform Applications

Sachin Sharma is a premier App Developer based in Delhi, India, specializing in high-performance cross-platform mobile apps (Flutter, React Native) and desktop solutions (macOS, Windows). Having developed and delivered multiple production-grade application prototypes and a highly performant feedback, Sachin builds fast, offline-first, and beautifully animated apps for global clients.

I know you want to build something great with 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.

Or just see what I've built first

At a Glance

Target Architectures

iOS, Android, macOS, Windows Desktop

Primary Frameworks

Flutter (Dart compiled), React Native (Hermes bytecode)

Desktop Engines

Flutter Desktop Runner, Electron/Neutralino

Offline Database

SQLite, Isar NoSQL Cache, Hive

State Solutions

Riverpod, Zustand, BLoC

Hardware Bridges

Custom Swift / Kotlin / C++ platform channels

Build Automation

Codemagic, Fastlane, GitHub Actions

OTA Updates

Shorebird dynamic Dart code injection

On This Page

~6 min read

1. Cross-Platform Engine Design: Flutter vs. React Native Shells

2. Offline-First Database Engineering: Relational and Key-Value Cache

3. Multi-Platform Hardware Integration (Swift, Kotlin, & C++)

4. Notification Routines & Event Engines (FCM & APNs)

5. App Store connect & Google Play Console Submission Guidelines

6. Shipped Apps Case Study: Loopin, Legease, and Aashwasan

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 cross-platform development over native codebases?

Cross-platform development (using Flutter or React Native) allows us to share over 90% of the codebase across iOS and Android, reducing development times and maintenance costs.

How do you handle background execution constraints on iOS and Android?

I configure native foreground services for Android and background fetch/silent notifications for iOS, complying with OS resource rules to prevent processes from being stopped.

What is your approach to securing sensitive local user data?

I encrypt local databases using SQLCipher with AES-256 keys, and utilize secure keys stored in device keychains protected by biometric authentication.

How do you optimize app performance and rendering speeds?

I use paint boundaries to prevent unnecessary layout redraws, offload heavy calculations to background isolates, and utilize hardware-accelerated rendering engines like Impeller.

Do you automate app store deployments?

Yes. I set up automated TestFlight beta tracks and Play Console testing channels, allowing teams to test builds before public release.

What is the difference between Flutter and React Native rendering?

Flutter renders layouts directly to the GPU using its own Impeller canvas engine, whereas React Native bridges layouts to native platform components.

How do you configure database encryption in SQLite?

I compile the SQLite build with SQLCipher parameters, and encrypt database files using password keys stored inside secure local keychains.

What is a custom JSI native module?

A JSI module allows JavaScript code to interact directly with native C++ classes, skipping bridge delays and speeding up API calls.

How do you manage certificates and profiles in Fastlane?

I use Fastlane Match. It encrypts and stores provisioning profiles inside a private Git repository, syncing profiles across development environments.

What are the common causes of app startup latency?

Common bottlenecks include running database queries during app initialization, loading heavy packages, and processing complex layout calculations.

How do you handle localized layouts and multi-language support?

I configure localization maps (ARB or JSON files), and translate UI strings dynamically based on device language configurations.

How do you trace memory leaks in iOS applications?

I profile applications using the Xcode Allocations instrument, tracking memory growth, leaks, and reference loops during operations.

What is the role of the V8 engine in edge platforms?

The V8 engine compiles JavaScript code to machine instructions. Edge runtimes use V8 isolates to run scripts in small sandboxes, skipping VM spin-up times.

How do you handle offline transaction sync conflicts?

I apply conflict-free sync strategies. Every local write includes a timestamp and client ID, allowing the database sync engine to resolve updates using a last-write-wins policy.