naman khandelwal.

A full-stack AI travel planner that turns a single prompt into a complete trip itinerary — places, weather, photos, all streamed in real time.

• Distributed, event-driven Go backend on NATS JetStream, fanning each HTTP request across 4 parallel micro-workers — cut end-to-end latency from ~2.5 min to 50–60s.
• Streamed partial itineraries to the Next.js frontend via Server-Sent Events, putting first results on screen in under 8s.
• Ranked spots with a linear ML model trained offline over 50 destinations, then sequenced daily routes to minimize travel distance via a 2-opt greedy TSP solver.
• Managed five independent async state slices arriving out of order, driving a live stage-progress UI with per-stage counts instead of one loading spinner.

A peer-to-peer skill exchange platform with real-time end-to-end encrypted chat and WebRTC video calling.

• Led backend systems design in a 4-member team for a P2P skill exchange platform with real-time end-to-end encrypted chat.
• Engineered a concurrent WebSocket Hub in Go handling real-time fan-out, optimistic updates, typing indicators and WebRTC-based video calling.
• E2EE messaging via X25519 key exchange + XSalsa20-Poly1305, and LiveKit-powered video calls — backed by Vitest unit tests covering the crypto and chat layers.

A personal study & resource hub organized around Subjects — plan milestones, stash resources, and track focus time. You're the brain; LockIn is the shelf + planner, not an AI generator.

• Drag-and-drop task boards with optimistic React Query mutations, updating the UI instantly ahead of server sync.
• Code-split a CodeMirror markdown editor out of the main bundle and memoized list rows to cut re-renders.
• One component tree, two fully interchangeable themes via next-themes — Creative (light, neobrutalist) and Focus (dark, editor-calm).
• Cross-subject Today view for due/overdue tasks; a focus timer logs time per task into a GitHub-style heatmap.