Sumit Kumar

Flutter Developer specialising in AI-native mobile applications — RAG pipelines, LLM API integrations (Claude, Gemini), and real-time systems. Shipped production apps end-to-end with measurable impact: 80% startup performance gain at Grocery On Wheels, sub-300ms semantic retrieval in a Claude-powered document intelligence platform, and real-time multilingual chat with per-room AI translation. Strong across the full stack — Flutter/BLoC/Riverpod frontend to Node.js/PostgreSQL/Redis backend.

Flutter Developer Intern at Grocery On Wheels (2025-10 – 2026-03)

• Revamped inventory screens in Flutter; stabilized frame rate from 45 to 60 FPS, improving browsing smoothness.
• Boosted cold startup by 80% via lazy loading, Dart isolates, and intelligent caching strategies.
• Integrated REST APIs with JWT auth and Hive offline caching; achieved zero data-loss incidents in production.
• Debugged intermittent payment gateway failures during checkout, resolving recurring transaction timeout errors in production.
• Deployed the app to the App Store, managing the full release cycle and resolving submission and review issues.

SDE Intern — Flutter & Backend at SCM Software Labs (2025-05 – 2025-08)

• Architected Spring Boot REST APIs with JWT + OAuth2 across a 3-role RBAC system, serving 10K+ users with zero auth breaches.
• Owned end-to-end Flutter client with live GPS tracking, cutting delivery delays by 15 min/order through real-time location updates.
• Engineered event-driven messaging achieving 98% delivery reliability, replacing a polling system prone to drop-offs under load.
• Reduced server load 40% and startup time 80% via async processing, batched calls, and Hibernate query optimization.
• Containerized on AWS EC2 with Docker; automated CI/CD via GitHub Actions, cutting release cycle time by 60%.

B.Tech + M.Tech Dual Degree in Computer Science and Engineering – National Institute of Technology, Hamirpur (2022 – 2027)