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Hi, I'm

Sankalp Singh

Senior Software Engineer

Five years building mobile products that went from an early startup to millions of users. I care about the details people notice, the performance they don't, and the engineering decisions that keep things from falling apart as a product grows. I like the parts of engineering where a good architectural call quietly saves someone else a bad afternoon three months from now. When I'm not thinking about how to make a product better, I'm probably watching a football match and wondering why the manager made that substitution.

~/sankalp

$ cat facts.txt

    01 // Shipped

    Apps I've Shipped

    OneCard

    Core Architect

    Fintech mobile app for iOS and Android. Core contributor to the OneCard 2.0 rewrite, base architecture, and the New Architecture (TurboModules, JSI) migration.

    10M+ downloads
    650K+ DAUs
    React NativeTypeScriptNew ArchitectureTurboModulesJSI

    OneScore

    Contributor

    Fintech mobile app for iOS and Android, part of the same product ecosystem as OneCard.

    100M+ downloads
    40M+ users
    React NativeTypeScript
    02 // Open Source

    Open Source

    react-native-network-tools

    A developer tooling library for real-time network request inspection and analytics in bare/Expo React Native apps, for both Android (OkHttp interceptor) and iOS (NSURLProtocol).

    GitHubnpm

    React Native core — text clipping fix

    Diagnosed and fixed an Android text clipping bug in React Native core (ReactTextView.java) where adjustsFontSizeToFit failed to recalculate font size on container resize.

    GitHub
    03 // <SkillList />

    Skills

    Rendered the way I'd build it — flick the list and watch the runtime work.

    9:41
    Skills55 items
    Mobile9
    Languages8
    State & Data5
    AI Tools6
    Tooling7
    Testing4
    CI/CD & Build4
    Backend4
    Integrations8
    Mobilesticky
    release to refresh

    Drag · flick · pull to refresh

    Runtimelive
    scrollY
    0.0
    velocity
    0 px/s
    fps
    60
    viewable
    0 / 55
    Event log
    • › SkillList mounted

    Mobile

    • React Native
    • New Architecture
    • TurboModules
    • JSI
    • Fabric
    • Hermes
    • Expo
    • iOS
    • Android

    Languages

    • TypeScript
    • JavaScript
    • Kotlin
    • Java
    • Swift
    • SQL
    • C++
    • HTML/CSS

    State & Data

    • Zustand
    • TanStack Query
    • Zod
    • RESTful
    • Web Socket

    AI Tools

    • Pi Agent
    • Claude Code
    • OpenSpec
    • Graphify
    • Kiro
    • Codex

    Tooling

    • VS Code
    • Xcode
    • Android Studio
    • Charles Proxy
    • Mockoon
    • react-devtools
    • Storybook

    Testing

    • Jest
    • RNTL
    • Maestro
    • fast-check

    CI/CD & Build

    • GitHub Actions
    • Fastlane
    • Build Pipelines
    • GitLab Runner

    Backend

    • Node.js
    • Express
    • MongoDB
    • Firebase

    Integrations

    • Razorpay
    • Juspay
    • Zeta
    • PayU
    • Firebase
    • Amplitude
    • AppsFlyer
    • Google Maps
    04 // AI Workflow

    How I build with AI

    Ask away — the answers are mine, written ahead of time.

    sankalp-1scripted · not a live model

    Curious how I build things? Pick a question and I'll tell you how I think about engineering, product, and the details in between.

    Suggested prompts

    What do you care about most when building a product?

    The stuff users feel, even when they don't know why. A screen that responds instantly, a flow that doesn't make them think, a feature that doesn't fall apart when traffic grows. I like working on the layer where product decisions and engineering decisions meet.

    What's your approach to performance?

    I don't like optimising things just because a profiler says I can. I want to know what the user is actually feeling first. Then I trace it back to the real bottleneck, whether that's rendering, network calls, native communication, or architecture.

    What was one of your more interesting engineering problems?

    Moving a large React Native app from the old bridge to the New Architecture. It wasn't just a migration exercise. It meant understanding how JS and native communicate, finding the places where the old assumptions mattered, and making sure the user actually benefited from the change.

    How do you think about architecture?

    I try to make the next engineer's job easier. A good architectural decision isn't necessarily the cleverest one. It's the one that makes the codebase easier to change six months later, when nobody remembers why that decision was made.

    Do you use AI to write code?

    Absolutely. But I don't want it deciding what we're building. I use AI to explore a codebase, challenge an approach, implement well-defined pieces, and run through verification. The important thinking still happens before the prompt.

    What's something you enjoy building?

    Anything where the interaction matters. Gestures, animations, navigation, real-time data, things that have to feel right at 60fps. I'm probably more interested in the last 10% of polish than I should be.

    What do you do when you're not coding?

    Watch football and analyse matches far more seriously than my friends think is reasonable. I enjoy the tactical side of the game almost as much as watching it.

    05 // Writing

    Technical Writing

    Latest posts, pulled live from Medium.

    React Native Internals: Decoding JS-to-Native Communication in the New ArchitectureJun 28, 2026In the shadows of React Native: The dark art of elevation and depth.May 6, 2026The Path Module in Node.jsSep 1, 2021Objects in JavaScript and what is spread operator.Aug 26, 2021
    06 // Contact

    Let's Connect

    Always happy to talk React Native, mobile architecture, or whatever you're building.

    Location

    Pune, India

    Elsewhere

    Send a Message