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Sung jin woo
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Sung jin woo
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Achievements

Achievement: YOLOAchievement: Pull Sharkx2Achievement: Pair Extraordinairex3

Achievements

Achievement: YOLOAchievement: Pull Sharkx2Achievement: Pair Extraordinairex3

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kumar-gautam24/README.md

Flutter & backend engineer · Bangalore

Currently at Ailoitte, contracted to Fractal Analytics — core mobile & backend engineer on Vaidya AI, an enterprise health platform ranked in the top 110 medical apps on iOS with 25K+ downloads.

Mobile   Flutter Dart Kotlin

Backend   Go FastAPI PostgreSQL

Cloud & infra   AWS Pub/Sub Docker GitHub Actions

What I've shipped

Project Stack Impact
Vaidya AI Flutter · FastAPI · HealthKit · Health Connect · PostgreSQL 25K+ downloads · top 110 medical on iOS
Guardian Bubble Flutter · FCM · WebSocket · Google Maps 99.9% crash-free · SOS in killed-app state
Flizz Flutter · RevenueCat · Firebase 10K+ downloads · cross-platform subscriptions
Manpower Management Go · PostgreSQL · Docker · Render UAE client · 178+ employees · live since 2024
Recurring Bills · source Flutter · Riverpod · Drift · FastAPI · AWS EC2 TestFlight beta, in App Store review · real No-Cost-EMI cost engine · provider-agnostic LLM layer · CI/CD to EC2 via GitHub Actions
  • Performance — cut Vaidya AI cold start 71% (3.5s → <1s) and binary size 35%
  • Scale — dual-platform HealthKit + Health Connect sync handling 10,600+ entries/user with idempotent upserts
  • Payments — FastAPI payment microservice with HMAC-SHA256 Razorpay webhook verification and atomic SQL credit deduction
  • Security — hardened against SOC audit: SSL pinning, root/jailbreak detection, OAuth injection fix

Code

Contribution activity Language breakdown

Open source

StacDev/stac  —  contributed Badge widget + JSON parser to a 786★ Flutter SDUI framework. PR #388 merged to production.

playground  —  fully offline LLM chat on Android. Download Gemma, Qwen, or DeepSeek and run inference on-device. No cloud. No API key.

Background

B.Tech CSE · Darbhanga College of Engineering · GATE CS qualified · ICPC Kanpur Regional 2022 qualifier CodeChef  ·  Codeforces  ·  LeetCode

Portfolio & Blog  ·  LinkedIn  ·  X

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  1. playground playground Public

    On-device LLM playground: chat with Gemma, Qwen & DeepSeek fully offline via flutter_gemma

    Dart

  2. icpc2022_kanpur_pelims_cpp icpc2022_kanpur_pelims_cpp Public

    ICPC Kanpur Regional 2022 Prelims — C++ solutions

    C++ 2

  3. healthify_me healthify_me Public

    Flutter health & wellness tracker app

    Dart

  4. honest-ledger honest-ledger Public

    Local-first personal-finance app for India — tracks what you borrow and its real cost, does the EMI math before you commit, and watches recurring bills. Flutter + Riverpod + Drift.

    Dart

  5. deflect deflect Public

    FastAPI docs support assistant that cites its sources and refuses to guess. Three services, an eval harness that gates CI.

    Python