Senior Software Engineer · New York

Cyrus Sarkosh

Engineering lead with 9+ years across distributed systems, product engineering, and AI. At DoorDash I've taken two products from zero to one, and in my spare time I build multiplayer games that run in the browser.

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Portrait of Cyrus Sarkosh

01 / Experience

Where I've worked

DoorDash New York, NY

Mar 2021 – Present

Senior Software Engineer, GEM

Jun 2025 – Present

Founding engineer and lead for GEM (Guest Reputation Management); helping restaurants keep up with their ratings, reviews, and reputation across DoorDash, Google, and Yelp, using AI.

  • Python
  • Kafka
  • CockroachDB
  • Postgres
  • Redis
  • Snowflake
  • OpenAI
  • Anthropic

Senior Software Engineer, Voice AI

Aug 2022 – Jun 2025

Founding engineer and lead for Voice AI; taking restaurant orders over the phone, first through call centers and then pivoting to AI agents.

  • Kotlin
  • Python
  • Twilio
  • OpenAI
  • Speech recognition

Software Engineer II, Drive

Mar 2021 – Aug 2022

End-to-end owner of DoorDash's support-as-a-service public APIs; bringing delivery-issue support into the systems businesses use to request DoorDash deliveries.

  • Kotlin
  • gRPC

Discuss.io Seattle, WA

Jan 2017 – Mar 2021

Software Engineer → Senior Software Engineer

Full-stack engineer for Discuss.io; connecting brands with consumers over live video for market research. Worked across its web and mobile apps, live video, and cloud infrastructure, and led its iOS and Android apps.

  • PHP
  • React
  • Postgres
  • WebRTC
  • AWS
  • Terraform

02 / Games & projects

Things I build for fun

Playable now · No install

Day Hike

A co-op first-person survival horror game for 1–5 players that runs in the browser. Send a link and play together: no install, no account, no server bill. Peer-to-peer realtime netcode via WebRTC with client-side prediction, lag compensation, and a deterministic 60 Hz simulation.

  • TypeScript
  • Babylon.js
  • WebRTC
Play in your browser

Open source · Coming soon

game-dayhike

The game code behind Day Hike: peer-to-peer netcode, client-side prediction, and the deterministic simulation.

  • TypeScript
  • Babylon.js
  • WebRTC
Repo coming soon

Open source

electron-gamepatch

Official Electron releases, republished with small binary patches that remove game-hostile browser behavior.

  • Python
  • Electron
View on GitHub

03 / Skills

What I work with

Languages
  • Kotlin
  • Python
  • TypeScript
  • JavaScript
  • PHP
  • SQL
AI & LLMs
  • OpenAI APIs
  • Anthropic APIs
  • AI agents
  • LLM evals
  • Prompt engineering
  • Claude Code
  • Speech recognition
Backend
  • Distributed systems
  • Microservices
  • gRPC
  • REST APIs
  • Kafka
  • Event-driven pipelines
  • Webhooks
  • Authentication
Data
  • Postgres
  • CockroachDB
  • Redis
  • Snowflake
Cloud & infra
  • AWS
  • Docker
  • Kubernetes
  • Terraform
  • CI/CD
  • Prometheus
  • Chronosphere
  • Grafana
  • On-call & SLOs
Frontend & media
  • React
  • WebRTC
  • Twilio
  • Babylon.js
University of Washington B.S., Computer Science · 2017

04 / Contact

Let's talk.

I'm always happy to talk about AI products, distributed systems, engineering leadership, or browser games.

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