Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Masamichi Iimori, a full-stack engineer with 3+ years of full-time experience in web application development and over 6 years including internships. I enjoy building robust, scalable applications and collaborating with cross-functional teams to deliver customer value. Currently I lead a tech team as Tech Lead, defining requirements and making technical decisions, mentoring teammates, and driving code quality through reviews. I also contributed to AI-powered feature development and helped land new contracts with clients within days of release.…Hi, I’m Masamichi Iimori, a full-stack engineer with 3+ years of full-time experience in web application development and over 6 years including internships. I enjoy building robust, scalable applications and collaborating with cross-functional teams to deliver customer value. Currently I lead a tech team as Tech Lead, defining requirements and making technical decisions, mentoring teammates, and driving code quality through reviews. I also contributed to AI-powered feature development and helped land new contracts with clients within days of release.

Masamichi Iimori

Full Stack Developer, Web Developer, Back-End Developer, +3





Hi, I’m Masamichi Iimori, a full-stack engineer with 3+ years of full-time experience in web application development and over 6 years including internships. I enjoy building robust, scalable applications and collaborating with cross-functional teams to deliver customer value. Currently I lead a tech team as Tech Lead, defining requirements and making technical decisions, mentoring teammates, and driving code quality through reviews. I also contributed to AI-powered feature development and helped land new contracts with clients within days of release.…Hi, I’m Masamichi Iimori, a full-stack engineer with 3+ years of full-time experience in web application development and over 6 years including internships. I enjoy building robust, scalable applications and collaborating with cross-functional teams to deliver customer value. Currently I lead a tech team as Tech Lead, defining requirements and making technical decisions, mentoring teammates, and driving code quality through reviews. I also contributed to AI-powered feature development and helped land new contracts with clients within days of release.

Available to hire

Hi, I’m Masamichi Iimori, a full-stack engineer with 3+ years of full-time experience in web application development and over 6 years including internships. I enjoy building robust, scalable applications and collaborating with cross-functional teams to deliver customer value.

Currently I lead a tech team as Tech Lead, defining requirements and making technical decisions, mentoring teammates, and driving code quality through reviews. I also contributed to AI-powered feature development and helped land new contracts with clients within days of release.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Japanese

Fluent

English

Fluent

Work Experience

Tech Lead at Video Step Inc

August 1, 2025 - November 25, 2025

Lead a 5-member team, defining requirements and technical specifications for new features. Promoted code quality and knowledge sharing through code reviews and mentorship. Led development of an AI-powered feature and secured a new contract with a client within approximately 3 days of its release.

Full-stack Engineer at Video Step Inc

July 1, 2024 - July 1, 2024

Led feature development using Ruby on Rails, TypeScript, React.js, Next.js, and AWS. Drove Scrum adoption, reduced video publishing wait times by more than half, built a multi-async data schema, and led a major overhaul of the core video editing UI to improve usability for over 70% of customers.

Backend Engineer at Raksul Inc

November 1, 2023 - November 1, 2023

Developed new backend features including a new pricing plan and an event-driven webhook system enabling asynchronous notifications. Leveraged AWS SNS, SQS, and AWS Lambda (Go) to decouple services and support scalable fan-out across partner systems.

Full-Stack Engineer at Nexceed Inc

August 1, 2021 - August 1, 2021

Designed frontend features with Next.js and TypeScript; built backend APIs using Ruby on Rails and later Nest.js. Conducted feasibility studies with Autodesk Forge to render construction-related RVT files in a 3D viewer. Migrated backend services from Ruby on Rails to Nest.js, enabling a more strongly-typed codebase and improved maintainability. Worked across the full stack with AWS and Docker to support development, deployment, and infrastructure operations. Delivered core features including marketplace search and user notification functionality; established CI/CD pipelines to improve development efficiency and supported product launches reaching 500+ users.

Full-Stack Engineer at ANIFTY Inc

August 1, 2022 - August 1, 2022

Joined as a founding Full-Stack Engineer during graduate school, contributing on a non-salaried basis to support an early-stage startup. Built frontend features with Next.js and TypeScript, developed backend APIs using Node.js, Express, and Prisma, and implemented a serverless architecture using Google Cloud Functions and Cloud SQL. Delivered core features including marketplace search and user notification functionality, established CI/CD pipelines, and contributed to product launches reaching hundreds of users.

Full Stack Engineer at Video Step Inc, Japan

August 1, 2025 - November 25, 2025

Led 5 team members; defined technical specs for new features; validated requirements with Product Manager; promoted code quality via code reviews and mentoring; led development of an AI-powered feature that secured a new contract within ~3 days of release.

Full Stack Engineer at Video Step Inc, Japan

July 31, 2024 - July 31, 2024

Led feature development using Ruby on Rails, TypeScript, React.js, Next.js; led Scrum adoption; reduced video publishing wait times by more than half; designed database schema for multi-asynchronous processes; redesigned core video editing interface and timeline-based editing features.

Back-End Engineer at Raksul Inc, Japan

November 30, 2023 - November 30, 2023

Developed backend features including pricing plan; designed event-driven webhook system enabling asynchronous notifications to external partner systems; leveraged AWS SNS, SQS, and AWS Lambda to decouple services; migrated backend services from Ruby on Rails to Go; built scalable backend for external partner integrations.

Full-Stack Engineer at Nexceed Inc, Japan

August 31, 2021 - August 31, 2021

Designed frontend features with Next.js and TypeScript; built backend APIs with Ruby on Rails and later Nest.js; conducted technical feasibility study using Autodesk Forge for 3D rendering; led migration of backend services to Nest.js; worked across full stack using AWS and Docker; delivered core marketplace search and user notification features; established CI/CD pipelines.

Remote - Full-Stack Engineer at ANIFTY Inc, Japan

August 31, 2022 - August 31, 2022

Joined as a founding full-stack engineer during graduate studies; built frontend features with Next.js and TypeScript; developed backend APIs with Node.js, Express, Prisma; implemented a serverless architecture using Google Cloud Functions and Cloud SQL to improve scalability and reliability; delivered core marketplace search and user notification features; supported product launch reaching 500+ users within two months.

Full Stack Engineer at Video Step Inc

July 1, 2024 - July 1, 2024

Led feature development using Ruby on Rails, TypeScript, React.js, Next.js, and AWS (EC2, ECS, RDS, ElastiCache), Docker. Advanced Scrum adoption and process improvements. Reduced video publishing wait times by over 50%, enabling 2x faster publishing. Designed database schema to manage multiple asynchronous processes. Reworked core video editing UI with timeline-based editing, resulting in 70%+ customer-reported ease.