I build the unglamorous infrastructure underneath products people actually use — real-time calling, event pipelines, and the analytics that tell a business whether any of it worked.
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🔭 Senior Software Engineer at BIK (Y Combinator S20)
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📡 Shipped real-time WhatsApp calling on WebRTC + Meta APIs — persistent permissions, low-latency call controls, session-resilient state sync
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📊 Architected analytics pipelines capturing millions of events, driving 15%+ tracked conversion lift and 20% faster issue resolution
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🧪 IEEE and IJCRT published — deep learning for accessibility and markets
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🛠️ I build free developer tools and give them away — no signup, no ads, nothing leaves your browser
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🌱 Currently going deeper on distributed systems, Kubernetes and GCP
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💬 Ask me about real-time systems, WhatsApp Cloud API, event pipelines, Postgres at scale
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📫 Reach me at himanshu20032002@gmail.com · 📄 Resume
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⚡ Fun fact: 01101100 01101111 01101100
Browser-only. No signup, no ads, and no request carrying your data anywhere.
| Tool | What it does |
|---|---|
| WhatsApp Webhook Inspector | Flattens Meta's four-level Cloud API payload and explains the error codes — including 131047 and the 24-hour window |
| Cron Expression Explainer | Plain English + next 10 fire times, your timezone or UTC. Handles the day-of-month/day-of-week OR rule everyone misreads |
| JWT Decoder | Offline decode, every claim explained. Deliberately no signing-secret box |
| In-Hand Salary Calculator | India FY 2026-27, new vs old regime side by side, EPF and gratuity included |
| Freelance Rate Calculator | Works backwards from target take-home. Handles 44ADA and the GST threshold |
- Spam Shield — privacy-first Android call blocker on the Play Store. Kotlin
CallScreeningService, sub-100ms interception, fully offline, zero data collection - Tidybox — AI email triage for Gmail. Classifies the whole inbox, labels it, archives the noise, writes a daily briefing
- Second Brain for YouTube — Chrome extension for transcript extraction and semantic summarisation at zero API cost. Featured on Product Hunt
- Detection of Indian Regional Sign Language Through CNN — IEEE, GCITC 2023, pp. 1–7 · cited 5 times
- StockSage: Stock Price Analysis and Prediction Using Deep Learning — IJCRT, Vol. 12, Issue 5, pp. 323–330
Full profile → devwithcoffee.com/about