KHD
KHD Labs Mobile & Web Studio

Engineering Case Studies

We specialize in complex greenfield builds and high-stakes rescue missions. Here is how we diagnose bottlenecks, re-architect systems, and verify performance on physical hardware.

Mobile Systems & Offline Sync / Fleet Logistics Corp
Production Verified

LogiRoute: 120Hz Dispatch & Field Sync Engine

Re-architected an unstable React Native courier app that crashed when drivers entered subterranean warehouse loading bays. Replaced whole-table JSON replication with an idempotent SQLite WAL delta stream, saving lost signatures and eliminating driver downtime.

Offline Data Loss
4.8% → 0.00%
120Hz Hitch Rate
34.1% → 0.3%
Cold Launch Time
4.2s → 0.78s
Key Technical Interventions
  • Custom TurboModule for atomic SQLite delta-stream writes with background sync priority
  • Deterministic offline intent sync queue with causal vector parent tracking
  • Hardware thumbnail decoding pipeline dropping RAM usage from 480MB to 95MB
Stack: React Native Native Swift SQLite WAL Go Backend PostgreSQL
Web Platform Engineering / Consumer Retail
Production Verified

Aura Commerce: Mobile Web Bundle Diet & Islands

A mobile checkout web platform suffering 62% bounce rates on mobile cellular connections due to a 4.1MB monolithic single-page application hydration block. Replaced with Astro islands and selective hydration, generating an immediate lift in checkout conversion.

Mobile JS Shipped
4,120 KB → 42 KB
Time-to-Interactive (4G)
7.1s → 0.85s
Checkout Conversion
1.8% → 3.4%
Key Technical Interventions
  • Eliminated barrel-file import cascades across 84 marketing and catalog components
  • Islands architecture hydrating cart drawer and checkout widgets strictly on user intent
  • Edge-cached static catalog with zero client JavaScript runtime overhead
Stack: Astro Tailwind CSS TypeScript Edge Workers Stripe Elements
Native iOS Engineering / MedTech Innovations
Production Verified

PulseMetrics: Real-Time BLE Medical Companion

A medical peripheral app that was repeatedly terminated by iOS Jetsam when patients switched between camera and monitoring. Engineered a zero-alloc CoreBluetooth state preservation engine with background telemetry.

Background Jetsam Kills
22.4% → 0.05%
BLE Packet Loss
7.2% → 0.01%
App Store Approval
Rejected 3x → Approved 1st Pass
Key Technical Interventions
  • Darwin kernel memory footprint lowered below 45MB to avoid per-process Jetsam limits
  • Encrypted local scratch buffer for instantaneous form restoration upon resume
  • Full compliance overhaul meeting FDA digital health and Apple Guideline 5.1.1 requirements
Stack: SwiftUI CoreBluetooth Combine Keychain Security
High-Density Web Platform / Institutional Trading Platform
Production Verified

TradeFlux: Financial Telemetry & Canvas Orderbook

Replaced a bloated React DOM grid with a high-performance HTML5 Canvas rendering engine capable of displaying 50,000 live orderbook updates per second with zero UI stutter.

DOM Node Count
18,400 nodes → 1 Canvas
Frame Rate Under Load
14 FPS → Locked 60 FPS
CPU Usage Under Volatility
92% → 18%
Key Technical Interventions
  • OffscreenCanvas rendering worker decoupling rendering cycles from network ingest
  • Circular memory ring buffers preventing garbage collection pauses during market spikes
  • Sub-millisecond orderbook delta diffing algorithm
Stack: HTML5 Canvas WebSockets OffscreenCanvas Web Workers TypeScript