Peifeng Wang

Tokyo, Japan|[email protected]|wangpeifeng.com

SUMMARY

Full-Stack Developer with 10+ years of hands-on development experience and 5+ years of team leadership.

Specialized in Python, Go, Elixir, JavaScript, and TypeScript across diverse domains including SaaS, robotics, and supply chain.

Proven ability to lead and deliver 0-to-1 product development in fast-paced startup environments.

Experienced in Linux and cloud infrastructure (including AWS) for over a decade, with strong CI/CD expertise (GitHub Actions, Docker) and infrastructure automation (Ansible).

HIGHLIGHTED ACHIEVEMENTS

•Delivered 0-to-1 full-stack platforms in SaaS security, machine learning, and robotics, including major systems at Geetest and BITO Robotics.
•Led development and launch of multiple digital supply chain systems and automation tools at Shucheng AI.
•Developed, maintained, and optimized high-throughput API services handling 2-3 million daily requests at Foriio.
•Developed a production-grade timecard SaaS using Elixir and Phoenix, including core timecard workflows and a high-concurrency real-time kiosk service built with Phoenix LiveView and WebSockets, at L*.

CORE SKILLS

Languages:

Python, JavaScript/TypeScript, Elixir, Go, Ruby

Web Frameworks:

Flask, Django, ReactJS, Next.js, Phoenix, Rails

Databases:

PostgreSQL, MySQL, MongoDB, Redis

DevOps & SRE:

GitHub Actions, Docker, Ansible, Prometheus, Grafana

Cloud Platforms:

AWS, Google Cloud, Linux

WORK EXPERIENCES

L******

Kichijōji, Tokyo, Japan

Full-Stack Engineer

Aug 2025 – Present

L* is a high-caliber startup based in Japan with a strong engineering culture and a technically rigorous stack centered on Elixir.

I was responsible for the development of a timecard SaaS service, contributing to core functionality and system implementation within a highly capable and technically demanding environment.

•I work on a new timecard SaaS project using Elixir and Phoenix.
•I also develop a real-time employee work status map using sprite graphics, Canvas, and Anime.js.

Foriio

Shinjuku, Tokyo, Japan

Lead Full-Stack Engineer

Aug 2024 – Jul 2025

Foriio is a startup based in Japan focused on building portfolio products for creators.

I joined foriio as Lead Full-Stack Developer, where I took over a codebase after the departure of the previous engineering team, including the VP of Engineering. I rebuilt and led a new development team responsible for maintaining existing products and delivering new features. While the product domain was not technically complex, the role was highly challenging due to team reconstruction, ownership transition, and delivery under uncertainty.

•Maintained and refactored Ruby on Rails APIs to improve scalability and support 2–3 million daily requests.
•Architected and developed a new commerce platform using Ruby on Rails, Next.js, and TypeScript.
•Improved company-wide CI/CD processes across 10+ projects and 40+ servers, ensuring streamlined deployments and continuous updates.
•Led a development team of 4 members.

Gennmu Technology

Nihonbashi, Tokyo, Japan

Software Engineer

Jan 2023 – Jul 2024

•Developed on the Salesforce platform using JavaScript, SQL, and Excel. Focused on data analysis and business email.

Shucheng AI

ShangHai, China

Full-Stack Engineer/Technical Director

Jul 2019 – Feb 2022

Shucheng AI is a supply chain digitization company incubated by SF Express, China’s largest logistics enterprise.

I worked at Shucheng AI as a Full-Stack Developer and Technical Director, where I participated in the architecture, design, and development of multiple supply chain digitization products, as well as several proof-of-concept (PoC) initiatives.

•Developed automated digital tools for supply chain optimization using Python, Vue.js, and C++ algorithms.
•Collaborated with Starbucks to create a machine learning forecasting system using Python.
•Developed an Amazon-like e-commerce platform using Django, Vue.js, and Django REST Framework.
•Created automation tools for operations using Docker, GitLab CI/CD, Jenkins, and Golang.
•Led a development team of 5 members.

BITO Robotics

ShangHai, China

Senior Full-Stack Engineer

Jul 2018 – May 2019

BITO is a robotics company specializing in autonomous forklifts and AGV (Automated Guided Vehicle) systems. The core team is primarily composed of engineers with Carnegie Mellon University (CMU) backgrounds.

I worked at BITO as a Senior Full-Stack Developer, where I designed and developed a web-based central control system for autonomous forklifts, as well as an AGV-side monitoring and operations system.

•Reconstructed a web control system for autonomous warehouse forklifts using Flask, Redis, ROS, and Vue.js.
•Designed a high-performance robotic automation road network system with Flask, Vue.js, and D3.js.
•Led a development team of 3 members.

Geetest

Wuhan, China

Full-Stack Engineer/Web Team Leader

Jun 2014 – May 2018

GeeTest is a startup cybersecurity company based in Wuhan, China. I worked at GeeTest for four years, joining as the 13th employee at an early stage of the company’s growth. During my tenure, the company scaled to approximately 200 employees, with the engineering organization expanding to nearly 100 developers.

I progressed from a junior developer to Web Team Lead, where I led the development of multiple production-grade web services and contributed to the growth and maturation of the web engineering team.

•Independently developed 10+ SaaS web projects using Python, Vue.js, MySQL, and MongoDB.
•Led a development team of 10 members in developing data visualization and SaaS projects with Django, Flask, Vue.js, and React.
•Assisted the data department in building a machine learning platform using Celery, RabbitMQ, and Redis for data preprocessing tools.
•Collaborated with operations to create real-time monitoring systems with Tornado, WebSocket, and ECharts.

EDUCATION

Wuchang University of Technology

Environmental engineering

Sep 2007 – Jul 2011

Wuhan, China

PATENTS

WO2021184193A1 - Computer-Aided Warehouse Space Planning

PERSONAL WEBSITES

https://wangpeifeng.com/