Architecting the dialogues
between Code & Systems
Engineering in action.
Anti-gridlock transit routing, 3D WebGL physics simulations, and native macOS developer utilities built for production precision.
RebelRoutes India (Rebel Roots) — Multimodal Transit Engine
An anti-gridlock transit engine engineered for Indian commuters. Combines walking bypasses with suburban rail, metro skybridges, and tech-park back gates to circumvent Silk Board, Hinjawadi, and Western Express Highway bottlenecks. Features high-concurrency FastAPI routing algorithms and interactive Vite/React UI hosted across Vercel and Render.
Courier City — 3D Open World Browser Game & Simulation
A GTA-style 3D open-world simulation engine running natively in the browser at 60 FPS. Implements rigid-body vehicle dynamics, aerial flight physics, and procedural street grid generation across 3,600+ lines of raw JavaScript with zero external 3D models or textures downloaded.
{ "status": "success", "coins": 450, "hang_free": true }
ShubhranshProxy — Native macOS HTTP(S) Debugging Proxy
Engineered a native macOS proxy engine from scratch in pure Swift. Features intelligent domain grouping, selective SSL decryption, zero-config mobile traffic capture on the same Wi-Fi, mock breakpoint rewrites, and full HAR export — completely free and open source.
{
"user": "shubhransh",
"verified": true,
"telemetry": "0% telemetry"
}JSONLens — Fast, Privacy-First Client-Side JSON Playground
A high-velocity, privacy-first developer workbench. Formats, validates, and visualizes complex payloads with interactive tree, diagram, and table graph views. Features dual-pane semantic diffs, instant Swift/TypeScript code generation, and Postman-style API testing with zero server logging.
Hey, nice to meet you.
A quick window into how I build — and what drives my engineering every morning.
I started my engineering journey fascinated by how hardware meets software, earned my Computer Science degree from BNM Institute of Technology (GPA 8.45), and ranked #1 college-wide on GeeksForGeeks.
Today, I'm a Senior iOS Engineer who treats mobile apps not as static UI canvases, but as real-time, high-concurrency distributed engines. Across India's top consumer tech ecosystems — from Pocket FM and Navi to MakeMyTrip and Nuclei — I have engineered features that serve 50M+ users daily with 99.9% crash-free stability and 100% hang-free responsiveness.
When I'm not profiling memory allocations or sanitizing GCD queues, I build developer tooling like ShubhranshProxy, JSONLens, and MirrorLock — solving deep ergonomic bottlenecks for mobile developers and AI coding agents.
The Primer for Production Scale.
Engineering guidelines honed across high-concurrency production systems and millions of daily sessions.
Swift-First Concurrency
Designing for asynchronous safety, not guesswork. I architect with modern Swift 6.0 Actors, Structured Concurrency (TaskGroup, AsyncSequence), eliminating thread explosion and mutual exclusion deadlocks.
100% Hang-Free & 99.9% Crash-Free
Obsessed with main-thread sanitation. Utilizing Xcode Instruments, Allocations, and Time Profiler to purge retain cycles, offload expensive parsing to background QoS queues, and lock in 120Hz ProMotion fluid rendering.
Modular SDKs & Clean DI
I build scalable systems designed for fast developer handoffs. Decoupling feature pods via Swift Package Manager (SPM), Swinject dependency injection containers, and Coordinator navigation graphs.
Guided by Business Conversion
A clean architecture only matters if it moves the needle. From Store Revamp V2 with StoreKit 2 & Juspay at Pocket FM to Zero Cancellation at MakeMyTrip, I build features that directly elevate retention and monetization.
A record of high-scale chapters.
Shifting contexts, evolving scale, different teams — all driving toward rock-solid stability.
Pocket FM
Senior Software Engineer (SDE 2) · Audio Streaming Tech- Spearheaded the complete end-to-end architecture and implementation of Store Revamp V2, enabling seamless coin purchases via Apple In-App Purchase (StoreKit 2), Juspay gateway integration, and rewarded ad unlock flows with rich fluid animations.
- Eliminated UI thread bottlenecks through rigorous hang detection, thread sanitization, and GCD queue profiling, achieving 100% hang-free performance and maintaining 99.9% crash-free sessions at massive audio streaming scale.
- Overhauled Notification & Tracking Permissions, implementing privacy-compliant telemetry to diagnose real-time hangs and crashes while driving higher user opt-in for episodic content releases.
- Re-engineered Profile Revamp V2 featuring dual-channel OTP verification across email and phone, streamlining listener onboarding and reinforcing account security.
Navi
Software Development Engineer 2 · High-Scale FinTech- Dramatically improved application scalability and modular lifecycle separation by migrating legacy AppDelegate lifecycle to SceneDelegate architecture.
- Enabled deep-linking, contextual shortcuts, and faster content discovery by implementing CoreSpotlight-based search indexing directly into iOS system search.
- Enhanced architectural testability and clean domain boundaries by implementing runtime and compile-time dependency injection using Swinject.
- Awarded Best Innovative Project at Navi Hackathon for conceiving and architecting Cobalion, an AI-driven regulatory compliance parsing platform.
MakeMyTrip
Senior Software Engineer · Consumer Travel Platform- Improved user conversion and revenue metrics by developing high-impact customer features like Zero Cancellation, Free Date Change Insurance, and advanced Sort & Filter using SwiftUI.
- Accelerated cross-team feature integration by architecting and implementing the Unified Flights SDK using SPM and CocoaPods across multiple architectural patterns.
- Increased pod velocity and code quality by leading an iOS pod and conducting technical knowledge-sharing workshops on modern Swift patterns and memory management.
Nuclei
iOS Developer · SDE 1 · Enterprise Banking SDKs- Delivered mission-critical mobile banking capabilities including Fund Transfer, Scan & Pay, and seamless customer onboarding across top tier-1 banks.
- Achieved full national regulatory compliance by integrating UPI using the NPCI Common Library (CL) and successfully navigating stringent security certifications.
- Optimized local offline caching and data integrity by refactoring CoreData migrations, background context concurrency, and database synchronization routines.
When the terminal is closed.
Because the best software breakthroughs usually hit when exploring beyond the day job.
Developer Tooling Obsession
Building native tools that solve real pain points — like ShubhranshProxy for SSL debugging and MirrorLock for botsitting autonomous AI agents.
git clone https://github.com/shubhransh-gupta/...
Competitive Problem Solving
Ranked #1 College-Wide on GeeksForGeeks (2021) and Champion at Innovative Project Labs (2018) at BNM Institute of Technology.
Agentic Harnesses & Tool Calling
Exploring multi-agent architectures (Scavengers Assemble) connecting Claude, Gemini, and GPT-4 with autonomous code execution.
Courier City — 3D Browser Simulation
Synthesizing Three.js, Cannon-ES physics, and procedural terrain to render open-world Bangalore landmarks right in the browser with zero downloads.
Shaping core systems at Scale.
Active open source contributions across Apple, Google, AppLovin SDKs, Microsoft, and Fastlane.
swift-argument-parser
Resolved a core flag-parsing edge case in Apple's official Swift CLI framework where --opt= silently consumed subsequent positional tokens.
google/osv-scanner
Fixed vulnerability report checklist filter state preservation in HTML output, preventing inadvertent menu dismissals when toggling vulnerability criteria.
AppLovin MAX SDKs
Authored critical fixes across official AppLovin SDKs: resolved layout & adapter view sizing constraints in React Native (#488), eliminated duplicate view mount lifecycle leaks (#487), and updated Android compileSdk 36 compatibility in Flutter (#366).
swift-protobuf
Added useDeterministicOrdering to TextFormat encoding options, guaranteeing reproducible serialization across golden test verification suites.
mlx-swift (Apple ML)
Corrected convolution padding bounds calculation in convolve for even kernels in same mode across Apple Silicon unified memory GPUs.
fastlane (sigh)
Fixed duplicate prefix injection in application-identifier entitlements during resign operations, preventing code signing rejections on app submission.
swift-crypto & aspire
Authored HKDF nonce derivation in CryptoExtras (#475), O(n) unique assertions in swift-algorithms (#290), and telemetry timestamp controls in .NET Aspire (#19931).
What the people I've shipped with say.
Direct recommendations from engineering leads, managers, and collaborators on LinkedIn.
"I've had the pleasure of working alongside Shubhransh at MakeMyTrip, and I can confidently say that he's one of the most dedicated and resourceful professionals I've worked with. Whether it's tackling complex challenges, collaborating across teams, or bringing new ideas to the table, Shubhransh consistently brings a positive attitude and a strong work ethic."
"I worked with Shubhransh on flight unification, and his contributions were truly outstanding. He tackled complex challenges with ease, especially at the kernel level, where his deep understanding of concurrency stood out. His solutions were performance-optimized, significantly improving system reliability. What sets Shubhransh apart is his ability to break down intricate problems into clear implementations."
"Working with Shubhransh in the Hotels domain, I was consistently impressed by his deep understanding of iOS development and exceptional problem-solving skills. Whether tackling complex architectural challenges or fine-tuning UI/UX interactions, he always brought a thoughtful, detail-oriented approach to deliver clean, efficient solutions."
"Shubhransh demonstrated a high level of skill in every task across the Fund Transfer and UPI modules. Proactive and ready to take leadership, he converts business requirements into robust code very easily, showcasing a remarkable ability to translate conceptual ideas into practical, high-scale banking solutions."
Recognized for Concurrency, System Reliability & Engineering Leadership
Endorsed by engineering managers, leads, and staff peers across MakeMyTrip, Nuclei, and Pocket FM.