Shreyash Neeraj

May – Jul 2026, software engineering fellow

eSim on Cloud

25 modules never noticed

FOSSEE, IIT Bombay · React + SVG · Python · Django · Celery · Docker · PostgreSQL

Rebuilt the schematic editor of eSim on Cloud, IIT Bombay's browser-based circuit-simulation platform, moving it off an unmaintained library (mxGraph) onto a custom React and SVG canvas over an immutable JSON store. Migrated in place without breaking the save format or API contracts of 25 downstream modules.

Replaced reference-based netlist generation with a coordinate-keyed union-find connectivity compiler with electrical rule checks, and built a KiCad import pipeline using minimum spanning trees and Manhattan auto-routing.

Shipped a server-side HDL simulation service for Verilog, SystemVerilog and VHDL on Django and Celery queues, and led the production PostgreSQL upgrade, verified by a live harness and 22 end-to-end tests against deployed containers.

Sep – Nov 2025, sde intern

ShopCardd

measure, then claim

Node.js · Express · PostgreSQL · Redis · React Native · Jest

Built a concurrent e-commerce microservices back end in Node.js and Express with custom PostgreSQL and Redis connection pooling. Developed the customer-facing React Native app for checkout and catalog browsing, optimising JSON serialization across the JS-to-native bridge and adding local state caching. Added CI/CD pipelines with Jest unit and integration tests.

2026, project

OABLT

traced the byte path.

Go · Kotlin · Jetpack Compose · TCP · mDNS

Peer-to-peer bulk file transfer. A control/data split over TCP: one connection negotiates a JSON handshake, N parallel workers stream chunks, and the receiver rebuilds the file by positional write. Shipped as a CLI, a desktop GUI and an Android app with mDNS discovery and cross-compiled releases for Linux, Windows and macOS.

Found and fixed six structural performance bugs by tracing the byte path: a mutex serializing all parallel disk writes, a 4 KB read buffer causing a syscall storm, a file channel shared across workers.

Ran a worker-scaling study under emulated loss (180 ms delay, 8% loss): throughput peaks at 10 workers and falls off beyond, so the right worker count depends on RTT and loss. Methodology and raw data are published.

2026, project

OpenAir

spec first. always.

Go · QUIC · TLS 1.3 · Ed25519 · BBRv1

Secure peer-to-peer device continuity. A QUIC transport with Ed25519-pinned TLS 1.3 and a vendored BBRv1 congestion controller, specified first in a 1,255-line wire spec and an append-only decision log.

Built oabench, a cross-platform measurement harness: six shaped network profiles run in an unprivileged user namespace, with per-OS CPU accounting and JSON Lines output. Used it to benchmark QUIC against TCP over 48 runs.