Hayata Suenaga

Full Stack Software Engineer

Current time in Tokyo:

Scroll

Who am I?

Years of Experience

+3 years

Location

San Francisco, CA / Tokyo, JP

Hi! I'm Hayata, a software engineer with over three years of industry experience, much of which I spent at Expensify in San Francisco working on systems serving 15M+ users.

I focus on identifying common patterns that can be solved through existing solutions, letting teams ship faster by focusing purely on business logic. My recent interest is in natural language processing and its applications in the EdTech space.

In numbers

GitHub Activity

Loading contribution data...

Weekly Pull Request Counts

Loading PR data...

Eisuke

I'm building Eisuke, a language learning platform that combines web and mobile applications to help students in Japan learn English.

Main Website

Student Portal

Teacher Portal

iOS Beta

iOS Beta

Experience

Founder & CTO

August 2024 - Present

Eisuke L.L.C.

Architect and launch complete learning management system from concept to deployment, including end-to-end technical decisions for authentication, data modeling, and infrastructure
Build complete learning management system including web portals for teachers and students and cross-platform mobile apps (iOS/Android) using Turborepo, Vercel/Next.js, Expo/React Native, tRPC, PostgreSQL, Stripe and OpenAI/Anthropic APIs

Software Engineer

February 2023 - August 2024

Expensify

Led engineering projects within lean 50-person team powering platform with $151M annual revenue (2023)
Co-managed Expensify's strategic initiative to integrate new Expensify experience with classic platform, a key project highlighted in multiple earnings reports
Spearheaded QuickBooks Online integration project for new Expensify platform, facilitating transition for 15M+ existing users
Co-led TypeScript migration of 350,000+ lines of code across 750+ PRs with two teammates, reducing type-related bugs by nearly 100%
Authored language and style guidelines for company's open-source project, now referenced by 600+ active contributors
Optimized critical SQL queries achieving 30%+ performance improvement in key database operations
Managed and mentored a team of 10 contract engineers, overseeing multiple concurrent projects

Software Engineer

October 2022 - January 2023

JackBeNimble Inc

Independently designed and built complete mobile application from ground up, managing entire development lifecycle from requirements gathering to App Store deployment
Implemented comprehensive glossary system using Sanity CMS for education terminology

Software Engineer Intern

June 2022 - October 2022

Dendron

Implemented core features for document parsing engine and built custom VSCode extension components for previewing parsed notes using React and TypeScript
Collaborated with CEO on product roadmap and feature prioritization for core Dendron offerings

Research Assistant

June 2021 - August 2021

Centre College

Collaborated with biology department at Piedmont University to develop data visualization tool for analyzing operational taxonomic unit (OTU) occurrence in microbiome samples
Co-authored peer-reviewed research paper in the Journal of Computational Science Education detailing the development of the visualization tool
Worked on data preprocessing for molecular docking software analysis in collaboration with Centre College biology department

Education

Centre College

August 2019 - May 2022

Bachelor of Science in Computer Science

Founder's Scholarship recipient | Dean's List (4 terms) | President of Japanese Club
Relevant Coursework: Data Structures (UC Berkeley CS 61B, A-), Statistics (MAT 130, A), Discrete Structures (CSC 200, A), Entrepreneurial Development & Finance (ECO 401, A)
Developed comprehensive business plan that became foundation for current venture Eisuke L.L.C.

Contact me

Let's connect

I'm always looking for new opportunities and collaborations. If you have any questions, please don't hesitate to say hi 😆

Made with ❤️ by Hayata Suenaga