Real-time voice AI agents
Live in productionSpeech in, reasoning, speech out, under a second, across India's many languages.
Superfone · 2025 – present
engineer · bangalore
Kartik Yadav
I build real-time voice AI and cloud telephony systems. The kind of software that has to answer a phone call in milliseconds and not drop it. At Superfone I work across the stack: the call-control layer, the language models that handle live conversations, the infrastructure that keeps it all up, and the mobile apps people actually use.
off the clock
Outside work I play the points game. I've held a stack of cards over the years: Amex Platinum Travel, Axis Atlas and Magnus, a Vistara card, BOB Eterna, Tata Neu Infinity, and most recently the HDFC Diners Club Black Metal. I enjoy optimizing points, miles, and cashback across them.
selected work
all work →StrawGo: a real-time voice AI framework in Go
Open sourceA Go pipeline that fits an order of magnitude more concurrent calls on one machine than the Python tools it learns from.
square-key-labs · 2025 – present
Cloud telephony platform
Live in productionThe call-control backbone. SIP at the edge, call-flow orchestration, billing, and the APIs that tie business phone numbers together.
Superfone · 2021 – present
The Superfone iOS app
Live on the App StoreEmpty Xcode project to a live App Store release in under three weeks: CallKit, offline-first, real SIP/PSTN calling.
Superfone · 2026
Capstrix: a voice-data marketplace
LiveA product I'm building solo: a marketplace for consented, native-speaker code-switched speech (Hinglish, Tanglish, Banglish) that voice-AI teams can't get anywhere else. Mobile capture app, edge API, admin console, and an automated audio-QA pipeline.
Capstrix · 2026 – present
The Superfone Android app
Shipped to the Play StoreThe original Superfone dialer: a business soft-phone that rings real SIP calls, built in Kotlin on the Linphone stack and maintained across thousands of commits since 2021.
Superfone · 2021 – present