Hi, I’m Ayush.
I build systems that stay up.

Group video calling on an SFU

Rebuilding one-to-one WebRTC into real group calls

One-to-one calls used peer-to-peer WebRTC. Group calls reused a shared-room SFU that only supported a single broadcaster, so in a three-person call two participants stared at a blank tile. I moved it onto per-user producer streams on mediasoup, then added transport recovery and rejoin-on-reconnect so a call survives the network drops that are normal on Indian mobile data.

VMeeta · React Native · mediasoup · Socket.io · ⟨n⟩ concurrent peers

Real-time bidding under contention

What happens when two bids land in the same tick

A live auction is a correctness problem disguised as a UI problem. Two bids arriving in the same instant can leave the lower one winning if you just write both. Bid acceptance is serialised server-side so the higher offer always survives, and every client converges on the same state.

GreenBidz · React · Node · Socket.io · MongoDB · ⟨n⟩ concurrent bidders

A ranked feed with no model in the request path

Personalisation that still answers fast

Replaced a reverse-chronological feed with a scoring pipeline — interest learning, diversity, and a penalty for things you’ve already seen. Classification runs out of band on a schedule, never during a request, so the read path stays predictable no matter how heavy the scoring gets.

VMeeta · Node · MongoDB aggregation · p95 ⟨n⟩ ms · 6 signals

Why our group calls only worked for one person

A single-broadcaster SFU, three participants, and two blank tiles — what the topology was actually doing, and the fix.

Socket reconnects and the grace window

Treating a dropped socket as “left the call” is wrong on mobile. What a reconnect window costs you, and what it buys.