I'm a software engineer at eBay in San Francisco, on the Search Backend org's Query Search Stack team: Cassini, eBay's distributed C++ search engine. Since 2023 I own fitment, the subsystem that decides whether a listing fits the product a query names. MCS from UC Irvine, BTech in CS from SRM Institute.
Outside work I take apart things that were not meant to be opened: a TV's video plane, a keyboard's stock firmware, a phone's hinge sensor. ShutUp, an Android app I wrote in college, passed 26,000+ downloads.
I also run a small Proxmox lab, 16 guests declared in OpenTofu and diffed nightly by CI. It serves this site.
Own and maintain fitment, the Cassini subsystem that decides whether a sellable item is compatible with the product a buyer's query names.
Query Search Stack (QSS) team in the Search Backend org: Cassini, eBay's distributed, highly available C++ search engine.
Built a tool that records radio-technology metrics (5G, WCDMA) during network speed tests, stored in Room (SQLite) and uploaded to AWS.
Built a map-based crowd-density app on MapBox with an MVVM architecture and a Retrofit API client.
Extracted SQL data from Django models with complex relations for internal documentation.
Built a library management system in Java EE (JSP, servlets, SQL) with 2 ms response times.
Author & maintainer · GPLv3
26,000+
lifetime downloads, 4.3★ when the Play listing was last up
Android app that answers, silences and ends calls from proximity-sensor wave gestures.
Turns a binary proximity sensor and the accelerometer into gestures: a double-wave timing window, pick-up from a flat surface, face-down detection mid-call.
Author, private repository, paper account
Sharpe 1.04
2007–2026 backtest, one path (95% bootstrap interval 0.62–1.47). SPY 0.63, max drawdown 55% against 37%
Systematic US-equity trader: trend-filtered cross-sectional momentum with volatility targeting, executed through Alpaca.
Universe is S&P 500 + 400 plus still-listed removals to soften survivorship bias; block-bootstrap confidence intervals; stop-losses and daily regime exits were tested and rejected, not assumed. CI deploys to a timer on green master.
Author
20–25 fps
one process on the TV, no capture card, no HDMI splitter
Real-frame ambilight for Samsung Tizen TVs: a headless .NET service on the TV reads the decoded video plane from memory and drives a WLED strip over UDP.
Samsung's capture API returns the static UI layer, so the app dlopens the video-plane entry point instead: NV12 in PQ HDR, tone-mapped per scene and gamut-mapped from BT.2020 to the LEDs.
Fork maintainer, 40 commits ahead, proposed upstream in stages
374
scenarios against a nested KWin, none failing; REUSE lint in CI
An infinite window canvas for KDE Plasma, built only on KWin's public scripting API: no patched compositor, no private headers.
Every window stays an ordinary KWin window at an ordinary position, so fullscreen apps keep direct scanout; the canvas is a camera, not a second compositor. Written by an agent under my direction; the README says so.
Architect & sole operator
15 of 16
guests declared in OpenTofu (the dev box is not yet). Nightly CI reports plan drift against the live host
One Proxmox host, 16 guests, 15 declared in OpenTofu, behind a Debian gateway: Docker, Traefik, Authelia SSO and a Headscale VPN.
Git is the source of truth: a scheduled pipeline pulls live configs and commits the diff, secrets are SOPS-encrypted in the repo, and a 5-minute health check pages once per new fault, after it persists, with a cooldown.
Maintainer: per-key RGB, OpenRGB, the update and recovery tooling, the hardware findings. Fork of a community ZMK port, Apache-2.0
154 LEDs
lit from a ported WS2812 driver on the SoC's SPI DMA, GRB, one data line
Open firmware for a Wobkey Crush 80 Pro keyboard whose vendor never released source: ZMK on the Telink TLSR9511, a RISC-V SoC. USB, Bluetooth, 154 per-key LEDs and OpenRGB, installed over the stock updater with one cable.
My first identification was wrong: WB32 and a QMK port that could never run. The stock image's USB descriptor said TLSR9511, QMK has no port for it, and the findings document records the wrong turn next to the evidence. The matrix, LED line and power gate were traced from PCB photos and the stock binary's GPIO init.
Author, private repository
18 of 18
checks pass in a replay of pam_rssh's real sequence, negative controls included
Approve a sudo prompt on my workstation with a fingerprint on my phone. LAN only, key in the phone's hardware keystore.
The phone speaks two ssh-agent messages; the ECDSA key never leaves the TEE and BiometricPrompt gates every signature. A replay of pam_rssh's real sequence, with negative controls, is the gate before touching /etc/pam.d/sudo.
Author, private repository, in progress
3 states
is all the public hinge sensor gives; the real angle comes from the sensor HAL's own log line
The iPhone Duo unfold animation, recreated on a Galaxy Z Fold from what the hardware actually reports.
A table of measured facts drives the design: which display is which by aspect ratio, not id; raw frames streamed from screencap; the overlay excluded from capture through a shell-reflected SurfaceControl call.
Author
44
C++ source files, no game or physics engine
2D RPG in C++ with no game engine: collisions, animation and dialogue trees written from scratch.
Maps are authored in Tiled and loaded through tmxlite; collision, sprite animation, weapons and dialogue are hand-rolled on SDL2.
Maintainer of the fork, GPLv3
7★
on GitHub
GTK GUI for libinput-gestures touchpad gestures, an extended fork of gestureManager.
Adds the gestures and settings libinput-gestures supports that the upstream GUI did not expose.
My Crush 80, drawn from the 6×16 matrix in the ZMK board definition for it, after the vendor shipped no source. 86 switches, 16 column strobes, 6 row senses. Crush 80 firmware project →
Type on it or tap a key. Each press shows its matrix position and the two GPIO lines the firmware reads it through.
Sixteen guests, fifteen declared in OpenTofu, a nightly pipeline that commits whatever changed on the box and reports what the plan disagrees with, paging that costs one message per fault. What it caught and where it falls short.
The five-signal bot that lost to SPY, and a Sharpe of 1.04 with its confidence interval attached.
No capture card, no HDMI splitter: a headless Tizen app pulls decoded frames out of memory and drives an LED strip. The capture ABI, the HDR colour math, and the ways it fails.
What on this site is mine, what is machine-made under my direction, and which numbers are dated snapshots.
One Proxmox host, 14 containers and 2 VMs, declared in OpenTofu and diffed against the live host nightly by CI. A Debian gateway fronts it with Traefik, Authelia and Headscale; secrets are SOPS-encrypted in the same repo; every guest is backed up nightly and copied off the host. It serves this site. Git is the truth: how the lab runs →
Static inventory, not a live status page.
ritwick@portfolio:~$ help
Tap to type · Enter runs a commandClick to type · Tab completes · Esc leaves the terminal