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 five years of professional experience at global tech companies. He has broad experience in the web back-end, front-end, and machine learning systems at scale.
Portfolio
Experience
- Python - 10 years
- JavaScript - 10 years
- Node.js - 10 years
- Java - 5 years
- Machine Learning - 3 years
- TypeScript - 3 years
- React - 3 years
- Writing & Editing - 3 years
Availability
Preferred Environment
MacOS, Visual Studio Code (VS Code), IntelliJ IDEA
The most amazing...
...thing I've developed is a smart toothbrush that can detect plaque using blue light.
Work Experience
Software Development Engineer
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.
Software Engineer
Self-employed
- 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.
Senior Software Development Engineer | UI
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.
Software Engineer
Indeed
- 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.
Experience
Discovery Bot
https://www.automationanywhere.com/products/discovery-botAutomation 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.
Education
Master's Degree in Human-computer Interaction
The University of Tokyo - Tokyo, Japan
Bachelor's Degree in Information and Communication Engineering
The University of Tokyo - Tokyo, Japan
Skills
Libraries/APIs
React, Node.js
Tools
Git, IntelliJ IDEA, Nx
Languages
JavaScript, Java, TypeScript, Python, SQL, Haskell, OCaml, Kotlin
Frameworks
Next.js, Spring, Ruby on Rails 3
Platforms
Linux, MacOS, Visual Studio Code (VS Code), Arduino, Amazon Web Services (AWS), Google Cloud Platform (GCP)
Paradigms
Human-computer Interaction (HCI)
Storage
MySQL, PostgreSQL, MongoDB
Other
Writing & Editing, Machine Learning, Ubiquitous Computing, Research, Crowdsourcing, Algorithms, Data Structures
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