Kei Yoshikoshi
Staff Software Engineer at Meta
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolKei Yoshikoshi is a Staff Software Engineer and founder with 11 years of experience building products that make complex tech feel simple, spanning voice AI, web3 token infrastructure, and enterprise cloud. He led product and engineering for a $10M+ ARR Voice AI platform and shipped expressive TTS, voice cloning, and real-time agents used by millions, and later joined Meta’s Superintelligence Lab via acquisition. As co-founder of Megaphone/DeForm he raised $4.6M and built a token-distribution platform trusted by Coinbase, Forbes, Animoca Brands and licensed by NTT Docomo, demonstrating rare expertise at the intersection of GTM and on-chain tooling. Early-stage as Lumos’s first engineer he built core user-lifecycle systems now used by Fortune 500s, and at Microsoft he delivered enterprise-grade AKS and blockchain services and contributed Solidity samples to Azure blockchain repos. Raised across the US, Singapore, Japan and the UK, he’s driven by reducing cultural friction through technology—whether collapsing geographic distance with human-like voice agents or making token-based communities easier to scale. Based in San Francisco, he blends startup founding grit with production-hardened distributed-systems engineering and active open-source contributions.
11 years of coding experience
7 years of employment as a software developer
Bachelor’s Degree Electrical and Computer Engineering & Computer Science, Bachelor’s Degree Electrical and Computer Engineering & Computer Science at Duke UniversityHigh School, High School at Singapore American SchoolUniversity College London
English, Japanese, Chinese, Spanish
Github Skills (5)
smart-contracts10
solidity10
ethereum10
blockchain10
web3js9
Programming languages (12)
Github contributions (5)
Azure-Samples/blockchain
Nov 2018 - Feb 2019
Azure Blockchain Content and Samples
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:32 commits, 7 PRs, 3 comments in 2 months
Contributions summary:Kei primarily contributes to the `blockchain-workbench/application-and-smart-contract-samples` directory, adding, updating, and modifying Solidity smart contract samples. The modifications involve updating the contracts' structure, and functionality by introducing constructor functions, and also modifying the existing logic of the smart contracts. Moreover, they also fix warnings and adjust the contracts to newer Solidity versions and updating the dependencies.
content-blockchainazure-cosmos-dbblockchainazure-blockchainazure
keikumata/azure-pub-sub
May 2020 - Sep 2020
This golang library serves as a wrapper around the azure-service-bus-go SDK to facilitate the implementation of a pub-sub system on Azure using service bus.
Contributions:7 reviews, 25 commits, 15 PRs in 4 months
golangazure-service-busgolang-librarysdkbus
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