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GRISHALEVINE-ROZENVAYN 

Frontend & platform engineer and team lead building data-heavy, real-time UIs — live 911 maps and transcripts, micro-frontends, design-system infrastructure — plus open-source apps on the AT Protocol.

📍 New York, NY he/him ↳ led teams up to 14 engineers
⊹ enter the loft ▶ view work ✉ email ⌥ github ↧ resume.pdf

selected work

Things I've shipped.

protoimsg.app 2025

protoIM

Founder & Lead Engineer · 2025–present

proto Instant Messenger — open-source, cross-platform video chat on the AT Protocol: free, no-account-wall calls, positioned against FaceTime’s lock-in. An 8-package TypeScript monorepo (~65K LOC) shipping one real-time platform across web (React 19), desktop (Tauri v2 / Rust) and mobile (Expo). Hand-rolled WebRTC signaling with time-limited TURN creds on self-hosted coturn, LiveKit SFU for group calls, custom app.protoimsg.chat.* Lexicons, a Jetstream indexer, and 5 Fly.io services — including a self-hosted PDS and NLLB-200 live translation across ~17 locales.

React 19WebRTCTauri v2RustExpoLiveKitPDSFly.io
→ Visit site→ GitHub
courier.go 2026

Courier

Creator & Lead Engineer · 2026

A cross-platform notification hub for the AT Protocol — aggregates interactions from 380+ decentralized apps into one inbox with push (APNs + FCM) and real-time WebSocket streaming. A Go backend ingests Bluesky’s Jetstream and Microcosm’s Spacedust streams with classification, dedup, moderation and catalog-driven per-app filtering. DID challenge-response auth (secp256k1/ECDSA) + ATProto OAuth/DPoP; native SwiftUI and Jetpack Compose clients on Fly.io.

GoSwiftUIKotlin/ComposeJetstreamAPNsFCMWebSocketOAuth/DPoP
→ GitHub
virtualized-ui.dev 2026

virtualized-ui

Creator & Maintainer · 2026

An open-source headless React virtualization library — VirtualTable, VirtualList & VirtualSelect — published to npm with tree-shakeable ESM/CJS exports, full keyboard/ARIA accessibility, and async option loading with debounce + caching.

ReactTypeScriptnpmESM/CJSa11yheadless
→ Visit site→ GitHub
sauce.ios 2026

Sauce

Creator & Sole Engineer · 2026

A local-first iOS training & nutrition log — Expo dev client on SQLite + Drizzle with HealthKit workout sync and merge. Hand-built SVG trend charts, sports-science load metrics (session RPE, TRIMP, acute:chronic ratio, e1RM, energy balance), Claude-powered food estimation from text, photo or voice, and a streaming coaching chat via a small Hono proxy. Pure metric and sync logic lives in a shared, fully tested package.

ExpoReact NativeSQLiteDrizzleHealthKitHonoClaude APIVitest
fl0rli.com 2025

fl0rli

Sole Engineer & Designer · NYC

A creative floral design & art-direction storefront for fl0rli NYC. Customer gallery, shop and inquiries with a custom admin dashboard — Bun + Hono API, SQLite + Drizzle, JWT auth, Resend email. The pixel-flower above is its mascot.

React 18BunHonoDrizzleSQLiteResend
→ Visit site→ GitHub
desmondwilliams.nyc 2024

Desmond Williams

Sole Engineer · Client Site

A portfolio CMS built for NYC artist Desmond Williams — a responsive media gallery with image/video carousels and a secure, type-safe admin dashboard for self-serve content management. React + TypeScript + Supabase, optimized with Vite.

ReactTypeScriptSupabaseVite
→ Visit site

also in the workshop

nosky

Creator & Lead Engineer · 2026

ATProto social client (Expo/RN) that bypasses the centralized AppView — fans out directly to followed PDS servers with client-side merge/sort, on the Microcosm stack (Slingshot, Constellation, Spacedust).

Higher Empire

Sole Engineer · 2026

Five-app commerce + delivery platform — storefront, admin, menu, splash + a Bun/Hono backend (100+ endpoints). Square catalog/payments sync, OnFleet dispatch, live order tracking, custom discount engine.

viewsky

Creator & Lead Engineer · 2025

Full-stack ATProto feed viewer — instant browse plus self-hosted Jetstream indexing, full-text search, and getFeedSkeleton so feeds work inside Bluesky.

ATmosphereConf

OSS Contributor · 2026

Theming system for the official AT Protocol conference site (Astro + React + Tailwind) — 5+ community themes auto-detected by handle, plus flippable profile cards. 38 commits, ~7K lines.

Blento

OSS Contributor · 2026

Editable pronoun sets for an ATProto personal-website builder (Svelte 5) — multi-pronoun support, display-mode toggle, ATProto record persistence with Bluesky native-field fallback.

Social Leagues

Founder & Lead · in dev

Multi-tenant sports social platform (Fastify, Postgres, Socket.io, Expo) replacing LeagueApps — ~10K players across 4 cities, real-time war room, referee app, portable identity.

next-persist

Creator · 88k+ dl

Lightweight NPM package for persistent client state in Next.js with SSR/SSG benefits and stateful React/Redux wrappers.

insert coin

The arcade.

Games I built into proto Instant Messenger — fully ATProto-native, so high scores and your personal stats live in your own repo, not a database I control.

FAST HOPPER
0
BEST 0

HOPPER

Designer & Engineer · live now

A vertical platform-climber — leap up an endless ladder of platforms and chase the high score. Runs on a deterministic sim so every run is verifiable. Global leaderboards by difficulty (fast / faster), and your bests are written straight to your ATProto repo as actor.rpg.stats records.

TypeScriptCanvasDeterministic SimATProto RecordsLeaderboards
▶ Play now
HURDLES ▮ INSERT COIN ▮

HURDLES

In development

A reflex hurdler, currently behind a feature flag while it gets polished — the next cabinet to light up in the arcade.

TypeScriptCanvasWIP

career.log

Where I've worked.

RapidSOS

Jun 2025 — present
Team Lead (Jan 2026 — present) · Senior Software Engineer, Frontend (Jun — Dec 2025)
  • Wrote and delivered a cross-repo design proposal for a Module Federation platform: found 908 hardcoded colors across 18 modules, made theme changes ship with zero module rebuilds (proven with byte-identical bundles), and enforced it with a Vite plugin. First migrations cut audit errors from 137 → 7; rollout across all 21 modules is underway.
  • Led the team that shipped Communicator 1.0, a real-time 911 call-handling app now generating $2.5M ARR. Built live transcript and map visualizations (jurisdiction boundaries, co-located call pins) on high-volume WebSocket streams.
  • Co-own the Communicator and Supervisor apps as the only engineer in the owner group: work directly with pilot 911 centers on rollout and customer escalations, and respond to production incidents, including after hours.
  • Built a cross-jurisdiction interoperability layer (911 call handoff, mutual aid, live supervisor A/V bridge) in a two-day hackathon: 3 entity packages and 4 frontend modules. It placed 2nd and was merged into the product.
  • Promoted to team lead after stepping up during attrition. Lead 3 engineers and a designer, run planning, and reviewed 50+ PRs in two months. Taught our designer, who had never coded, to ship: 9 merged PRs in their first week.
  • Traced LLM commentary leaking into live 911 translations to a model swap and fixed it with an output guard and 19 new tests. Wrote the multilingual transcription architecture (10 → 70 languages) that became a 10-ticket epic.

FireHydrant

Sep 2024 — May 2025
Staff Frontend Engineer
  • Built a collaboration editor for an incident management platform (Tiptap, live commenting, AI-assisted drafting) on Temporal.
  • Led the migration from Jest to Vitest and the upgrade to Vite 6, cutting test and build times.

Kitman Labs

Jan 2022 — Sep 2024
Lead Engineer (Mar — Sep 2024) · Senior Software Engineer (Nov 2022 — Mar 2024) · Software Engineer (Jan — Nov 2022)
  • Led 14 engineers across frontend and backend, from SWEs to tech leads, building athlete performance and medical software for NFL, NBA, and Premier League clubs. Raised user satisfaction from 48% → 95%.
  • Ran structured 1:1s on direct reports’ goals and career growth, and mentored through code reviews and pairing. Led the frontend style guide and set team standards for accessibility, performance, and testing.

Codesmith

May 2021 — Oct 2021
Software Engineer (Contract)
  • Built a parsing algorithm for dynamic content rendering on the public site and educational platform, enabling non-technical contributions.

loadout

The toolkit.

Languages

TypeScriptJavaScriptGoPythonSwiftKotlinRustSQL

Frontend

React 18/19React NativeExpoNext.jsModule FederationSvelteAstroViteRedux ToolkitTanStack QueryZustandTailwindChakra UIStorybook

Data Viz & Maps

SVG chartsTanStack TableTanStack VirtualGoogle Maps JS APIreal-time streaming UIs

Backend & Realtime

Node.jsExpressHonoFastifyBunWebSocket (ws)Socket.ioWebRTCLiveKitcoturnTemporal

Data & Infra

PostgreSQLSQLiteSupabaseRedisDrizzleKyselyDockerFly.ioVercelCloudflare WorkersTurborepoGitHub Actionspnpm

Protocols & APIs

AT ProtocolLexiconJetstreamXRPCPDSOAuth/DPoPSquareOnFleetAPNsFCMResendDeepgramCloudinaryGoogle Maps

Native & Testing

Tauri v2SwiftUIJetpack ComposeExpo (iOS+Android)VitestJestRTLSupertest

Observability

SentryPrometheusPino

talks & writing

  • Bridging the Gap Between SSR & Client-State Persisted Data — JS Plain in English
  • What is the JAMstack & Serverless Architecture — SingleSprout Speaker Series
  • Intro to JavaScript: Variables, Control Flow & Looping — Build with Code

education

  • The New School University — BA, Creative Writing, Riggio Honors Program · with honors
  • Codesmith — Software Engineering Immersive, 2021

off the clock

  • Soccer, for the love of the game
  • Chess under summer stars
  • Walking with the dead poets of the West Village