Masataka Ushijima

I work fully remotely from Japan. Responsibilities ・As a senior full stack developer,I implement software including frontend, server side, and infrastructure. Key Achievements ・Developed multiple microservices using Python (FastAPI) and deployed them on AWS EKS, integrating with Route 53, ELB, and other AWS services. ・Built a data pipeline application to process client data, execute machine learning models, and generate reference data used by downstream systems. ・Designed and implemented a React-based dashboard to visualize processed data and machine learning inference results for enterprise clients. ・Designed and implemented a CI/CD pipeline using GitHub Actions and Helm Charts, streamlining application deployment and improving development efficiency.

Responsibilities: ・Led the mobile application team as acting manager. ・Prioritized technical challenges and led feature development in alignment with product goals. ・Managed team members through regular 1-on-1s and performance reviews. ・Streamlined hiring by planning recruitment strategies and refining interview processes. Achievements: ・Successfully transitioned from engineer to team manager, taking ownership of delivery and team performance. ・Built a development culture focused on feedback and growth, contributing to higher team retention and delivery quality. ・Aligned technical planning across product, engineering, and design teams.

Responsibilities: ・Developed and maintained mobile features using Flutter and Dart. ・Designed application architecture from scratch to support scalability and maintainability. ・Contributed to DevOps by writing CI/CD scripts and automation tools. ・Supported teammates through pair programming and code reviews. Achievements: ・Established the mobile team from scratch and became its first lead engineer. ・Introduced modern architecture and workflows, improving development speed and code quality. ・Played a key role in transitioning the company’s mobile app from WebView-based to fully native Flutter.

Responsibilities ・Designed and implemented new features across the stack as a full stack developer. Key Achievements ・Introduced schema-first API development using OpenAPI, significantly improving the developer experience and API maintainability. ・Built a video upload and processing feature in the web application using AWS Elemental MediaConvert. ・Contributed to a Chrome extension, web application, and Electron-based desktop application by fixing bugs and delivering new features across platforms.

Responsibilities ・Designed and implemented new features as a full-cycle developer. ・Led multiple projects as a project lead, overseeing both technical execution and coordination with stakeholders. Achievements ・Selected as one of the top 5 performing engineers in the company in 2020, out of approximately 100 engineers. ・Led the initial project to build a mobile application using Flutter and managed it as the project owner. ・Led the development of a content management application from scratch, including architecture design, implementation, and mentoring junior developers.

Achievements/Responsibilities: - Implemented a web application with Ruby on rails and React. - Introduced EC functions into an application using Stripe. - Designed a frontend architecture following Atomic design. Tech Stack: Ruby, Ruby on rails, JavaScript, React

I built wordpress web pages, created the its theme and implemented Art Scenes with React and Laravel.

I worked on designing and verifying a new business. I launched online teaching program for people who want to learn programing.

- I was a member of international development team(Japanese and Filipino). I implemented several API using Laravel, and communicated with Japanese customers and Filipino engineers to define requirement. - I was involved in Education business that Filipino teacher taught Japanese student English and programming. When students couldn't understand English or programming, I taught them it using Japanese as a translator. I was working on setting KPI about customer satisfaction and improved our business.

I worked on teaching HTML/CSS/Ruby/RubyOnRails/JavaScript/AWS to students who want to learn programming skills. I also handled new intern training, curriculum improvement and 1on1 for students. I won the best mentor (customer evaluation No. 1) in March 2018 and No. 2 in customer evaluation in April 2018.

Currently pursuing a degree in Computer Science, focusing on fundamental concepts in programming, algorithms, and software development.

Studied law with a focus on civil law at the Faculty of Law. While at Waseda, completed multiple internships at startups in Tokyo over three years, gaining practical experience and foundational knowledge for building high-quality software.