# Shun Usami > SWE | Master of CS at San Francisco State University | ex-Founder Location: San Francisco, California, United States Profile: https://flows.cv/shun About Me ๐Ÿ‘‹ I worked in Japan from 2014 to 2022 and relocated to the United States in 2024. Currently pursuing a Master's degree in Computer Science at San Francisco State University with an expected graduation in December 2025. I'm passionate about systems programming and low-level software development, and currently exploring high-performance computing and compilers. ๐Ÿง‘โ€๐Ÿ’ผ Professional Work I founded mikan (mikan.com) and developed Japan's most popular English vocabulary app from scratch, achieving over 9 million downloads. I also maintained BitcoinKit (github.com/yenom/BitcoinKit), an open-source project with 800+ stars, contributing 345+ features and fixes. ๐ŸŽ“ Academic Projects In my High-Performance Computing course (CSC746), I achieved a 99% grade using C++, CUDA, MPI, and OpenMP. I designed shared-memory parallel programs for multi-core CPU and GPU systems and analyzed performance using runtime, speedup, memory bandwidth, and cache metrics. I conducted various experiments on Perlmutter at NERSC using the HPE Cray Shasta platform. ๐Ÿงช Hobby and Independent Projects I built a Bash clone in C and wrote a detailed guide on incremental, unit-test-driven shell development (github.com/usatie/minishell/). I developed Quines, self-replicating programs that output their own source code, and created an ELF executable packer that encrypts and compresses ELF binaries with automatic runtime decryption. Additionally, I reimplemented the nm command to analyze ELF binaries and extract symbol table information, and built a Turing Machine Emulator to learn OCaml and understand Turing Machine operations. Let's connect if you're interested in systems programming, compilers, or AI infrastructure! ## Work Experience ### Software Engineer Intern @ Firework Jan 2024 โ€“ Jan 2024 | San Mateo, California, United States Designed and implemented a testing framework to assess conversational quality of AVA, a sales assistant LLM app, and implemented backend integration using Python with OpenAI API, Clarifai, Vectara, and Groq. ### Sales Operations Specialist @ Mirrativ Jan 2020 โ€“ Jan 2021 | Tokyo, Japan Built sales team and management system. The size of the team grew from 5 to 20+. ### Product Owner @ Mirrativ Jan 2020 โ€“ Jan 2020 | Tokyo, Japan I was in charge of building a new business idea's MVP ### Internship @ Mirrativ Jan 2019 โ€“ Jan 2019 | Tokyo, Japan ### CEO @ Yenom Inc. Jan 2018 โ€“ Jan 2019 | Tokyo Yenom Inc. was developing a wallet and development tools for IOS. Yenom is a mobile bitcoin wallet with a simple interface for mobile. BitcoinKit is an open source Bitcoin library for iOS written in Swift. ### Founder & CEO @ mikan Jan 2014 โ€“ Jan 2018 | Tokyo, Japan mikan is the most popular English vocabulary learning app in Japan, with over 5 million downloads. ## Education ### Master's degree in Computer Science San Francisco State University ### Computer Science 42 Tokyo ### Bachelor's degree in Mechanical Engineering The University of Tokyo ## Contact & Social - LinkedIn: https://linkedin.com/in/usatie --- Source: https://flows.cv/shun JSON Resume: https://flows.cv/shun/resume.json Last updated: 2026-03-30