Takuma Yoshitani, Developer in Bellevue, WA, United States
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Takuma Yoshitani

Verified Expert  in Engineering

Full-stack Developer

Bellevue, WA, United States
Toptal Member Since
January 17, 2022

Takuma is a full-stack software engineer with a master's in human-computer interaction and over three years of professional experience at global tech companies. He has experience in both the back-end and front-end of web development. Takuma is also familiar with A/B testing, UI/UX, and machine learning.


Amazon Web Services (AWS)
Amazon Web Services (AWS), Java, Kotlin, TypeScript, Python
Ruby on Rails 3, Node.js, React, Python, Machine Learning...
Automation Anywhere
TypeScript, JavaScript, React, Amazon Web Services (AWS)




Preferred Environment

MacOS, Visual Studio Code (VS Code), IntelliJ

The most amazing...

...project I've done is a full-stack invention of an exit-intent detection algorithm that achieved 92% accuracy.

Work Experience

Software Development Engineer

2021 - PRESENT
Amazon Web Services (AWS)
  • Received an award from the CEO for my work on reducing the build time of an internal tool by 90%.
  • Led the re-architecture of machine learning inference systems to reduce cost by 85%.
  • Led the automation of offline machine learning systems for sensor-fusion systems.
Technologies: Amazon Web Services (AWS), Java, Kotlin, TypeScript, Python

Software Engineer

2010 - PRESENT
  • Led the development of mobile applications for the University of Tokyo's May Festival 2015-2016. The festival is one of the largest school festivals in Japan, with more than 100,000 visitors. The app had more than 20,000 downloads in total.
  • Developed a Twitter sentiment analysis tool for a small startup.
  • Created a PowerPoint search system using Elasticsearch and Python for a mid-sized human resource company.
  • Developed an e-learning system for medical students with Ruby on Rails.
Technologies: Ruby on Rails 3, Node.js, React, Python, Machine Learning, Amazon Web Services (AWS), Google Cloud Platform (GCP), TypeScript, JavaScript

Senior Software Development Engineer | UI

2020 - 2021
Automation Anywhere
  • Designed and implemented the front-end and back-end API of X.509 client certificate authentication feature required for $10 million class contracts as the sole front-end developer on the team.
  • Led the front-end development of Discovery Bot, a new company product that discovers workflows and automates a personalized program for users. It was the winner of the Stevie Silver Award.
  • Coached and guided six software engineers on TypeScript and best practices through knowledge-sharing sessions and code reviews. Introduced TypeScript to two projects and fixed over 1,000 type safety issues.
Technologies: TypeScript, JavaScript, React, Amazon Web Services (AWS)

Software Engineer

2018 - 2020
  • Conducted more than 20 A/B testing experiments on the job search results page resulting in 10% increase in applications via recommended jobs, 4% increase in applications' starting rates, and 1.5% increase in recommended jobs click-through rates.
  • Created and implemented an exit-intent detection algorithm of 92% accuracy to prevent showing unnecessary coupon modals to employers posting jobs on Indeed.
  • Co-founded code quality guild to address code quality issues. Helped the security team introduce SonarQube to the build pipeline by setting up an exemplar with the company’s oldest and largest repositories.
Technologies: JavaScript, Java, Spring, TypeScript, React

Discovery Bot

Led the front-end development for the initial launch of this product.

Automation anywhere discovery bot is the only process discovery solution natively built into the leading intelligent automation platform.

It accelerates and scales automation across the organization by recording user activities, discovering documenting business processes, helping analyze process variances to identify automation opportunities with the highest business impact, and generating bot blueprints to automate them. All in a single enterprise platform.


JavaScript, Java, TypeScript, Python, SQL, Haskell, OCaml, Kotlin


React, Node.js


Git, IntelliJ


Writing & Editing, Machine Learning, Ubiquitous Computing, Research, Crowdsourcing, Algorithms, Data Structures, Nx


Next.js, Spring, Ruby on Rails 3


Linux, MacOS, Visual Studio Code (VS Code), Arduino, Amazon Web Services (AWS), Google Cloud Platform (GCP)


Human-computer Interaction (HCI)


MySQL, PostgreSQL, MongoDB

2016 - 2018

Master's Degree in Human-computer Interaction

The University of Tokyo - Tokyo, Japan

2013 - 2016

Bachelor's Degree in Information and Communication Engineering

The University of Tokyo - Tokyo, Japan