HRIDYESH
KUMAR

Thinkerbell Labs · Bangalore

• Built full multiplayer stack for Helios + Annie FSM — backend to device-level Socket.IO, real-time game logic, live leaderboards, and race condition fixes; shipped Helios UI flows for active games, live score/timer, and game-end handling.
• Took Chalk-Tactera mobile app from empty repo to functioning build: APIs, OTP auth, rate limiting, and session token security.
• Fixed field crashes on Annie devices caused by corrupted content packs from interrupted downloads — added file guards and post-download consistency checks, improving uptime.
• Hardened production infrastructure: automated MongoDB→S3 backup pipelines across all Helios environments, eliminated static AWS access keys by migrating to IAM Instance Roles, resolved critical Nginx misconfiguration, and migrated monitoring stack to Uptime Kuma.

Paperboxd · Independent

• Built Paperboxd end-to-end — a community reading platform inspired by Letterboxd, live at paperboxd.in. Covers reading tracking, social follows, rich diary entries, curated lists, and real-time activity feeds across 8+ event types.
• Migrated backend from MongoDB to Go + PostgreSQL with zero data loss (39 users, 4,100+ books); 60+ REST endpoints served via Railway (Singapore), frontend on Vercel.
• Shipped native iOS app in SwiftUI with custom navigation, semantic "vibe search" via embeddings, and multi-signal recommendation engine (ratings, social signals, MMR diversity).
• Implemented full auth stack: email/password, Google OAuth, and OTP login — with a separate mobile auth namespace supporting 30-day JWT tokens for seamless native experience.

Autograd · New Delhi

• Built a full-stack AI exam-evaluation platform (React/TypeScript + Python/FastAPI) with a LangChain/LangGraph engine handling 100+ concurrent evaluations — cutting manual grading time by 90%.
• Designed REST APIs with MongoDB aggregation pipelines and Python multiprocessing, plus a semantic answer-chunking algorithm: +85% accuracy, 5× faster processing.
• Shipped a real-time admin dashboard with WebSocket live progress and interactive feedback visualization over atomic MongoDB batch ops.

Limeroad · Gurugram

• Engineered the AddAddress flow with runtime permissions + FusedLocationProvider, reducing checkout abandonment by 75%.
• Architected payment-processing REST APIs in Java handling 1k+ transactions/day for 50k+ MAUs, with 30% faster response times.
• Implemented Levenshtein fuzzy search in TypeScript: +90% match accuracy, query time 1000ms → 100ms.