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Sachin Singh

@sachinsingh15

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Mobile Engineer at Degreed who cut warm-start time by 60% and built agentic engineering tools.

India

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At Degreed, I own mobile navigation and boot-lifecycle architecture, performance engineering, and production reliability. I traced a warm-start regression to a cold-start bootstrap bug and reduced warm-start time from about 10 seconds to about 4 seconds.

I also built internal agentic engineering tools, including a translation workflow that cut per-feature work from about two hours to six minutes. My work at Degreed includes a voice-AI coaching feature shipped from specification to production in two weeks as the sole mobile engineer.

Previously, at JungleeGames, I rebuilt shared payments architecture and shipped KYC Lite, lifting user conversion by 26.5%. Alongside full-time work, I architected and shipped Fork and Frosty Basket as a sole engineer, including a Flutter AI nutrition coach and a B2B marketplace with an idempotent order pipeline and append-only credit-wallet ledger.

Experience

Work history, roles, and key accomplishments

Current

SDE III, Mobile (Flutter + Native)

Current

Degreed

Sep 2025 - Present (1 year 1 month)

Owned architecture, performance, and production reliability for Degreed's Flutter mobile app. Led navigation and boot-lifecycle overhaul, built agentic developer tooling, and reduced startup time by ~30%.

Flutter Dart Kotlin Swift Auto_route BLoC Firebase Crashlytics MCP LangGraph C#.NET SQL Azure DevOps

Lead Engineer (Contractor)

HEC Paris

Jan 2022 - Jan 2026 (4 years)

Delivered 5 consecutive annual editions of the MBAT event platform as sole engineer, each with an immovable May live-event deadline. Shipped the 2026 edition as a 4-app platform to 1,500 attendees.

Flutter Dart Firebase Firebase Realtime Database Cloud Functions QR決済 Live Scores

SDE II, Mobile (Flutter + Native)

JungleeGames

Dec 2022 - Sep 2025 (2 years 9 months)

Built shared Flutter and backend capabilities for real-money gaming apps. Rebuilt Add Cash/payments architecture, cutting checkout latency and driving deposit conversion lift; designed KYC Lite flow.

Flutter Dart Kotlin Swift NodeJS TypeScript Go Firebase Juspay Razorpay Paytm Cashfree KYC Payments

Mobile Developer (Flutter + Native Add-to-App)

Tickled Media

Feb 2021 - Nov 2022 (1 year 9 months)

Introduced add-to-app pattern for embedding Flutter modules into native Android and iOS hosts. Drove app performance and shipped multi-tracker features for the Reckitt Benckiser suite.

Flutter Dart Kotlin Swift Flutter Add To App BLoC Provider Fastlane CI CD

Mobile Developer (Flutter)

Commutec

May 2019 - Jan 2021 (1 year 8 months)

Shipped three production mobile apps as one of the earliest mobile engineers. Refactored all three apps under senior code review, solving offline sync and real-time GPS tracking edge cases.

Flutter Dart Google Maps Hive Offline Sync GPS Tracking

Sole Engineer & Architect

Infiniteloop Tech

Jan 2025 - Present (1 year 9 months)

Architected and shipped Fork, a multi-modal AI nutrition coach, as sole engineer across iOS, Android, Apple Watch, and Web. Built event-driven Firebase backend with rate-limited LLM gateway.

Flutter Dart Swift ActivityKit Firebase Vision Whisper LLM NodeJS

Sole Engineer & Architect

Frosty Basket (Frozebase)

Jan 2024 - Present (2 years 9 months)

Architected and built a full-stack production system as sole engineer, including 4 Flutter apps, React 19 marketing site, and Node.js/Firebase backend. Designed idempotent atomic order creation and append-only credit-wallet ledger.

Flutter Dart React NodeJS Firebase Firestore Cloud Functions Security DevOps

Independent Engineer

OTT Streaming Platform

Built Flutter mobile and TV apps with Express and MongoDB backend, JWT auth, Razorpay subscription webhooks, and player-controller-driven lyric synchronization.

Flutter Dart Express MongoDB JWT Razorpay Android TV Apple TV