Wei User
@weiuser2
Full-stack software engineer specializing in TypeScript/Python API design and performance-optimized web systems.
JapanWhat I'm looking for
I’m a full-stack software engineer with 7+ years of experience across startups and enterprise environments in Japan and internationally. I specialize in TypeScript and Python, with deep expertise in API design, system optimization, and scalable web application architecture.
I’ve delivered 4–10× performance improvements and led products from concept to production launch. I’ve designed the system architecture and built foundational components of a hotel booking system from early stage, contributing across backend and frontend to bring it to production.
I also build AI-enabled features that create real automation value—proposing and contributing to an AI-driven customer support solution using Python, model fine-tuning, and RAG. Across my work, I design and document APIs, optimize data retrieval pipelines with query tuning and caching strategies, and ship reliable user-facing experiences using modern web frameworks.
Experience
Work history, roles, and key accomplishments
Full-Stack Developer
10pct Co., Ltd
Nov 2024 - Oct 2025 (11 months)
Designed the system architecture and built foundational components of a hotel booking system end-to-end. Proposed an AI-driven customer support solution and helped build a chatbot automation engine using Python with fine-tuning and RAG.
Built and maintained backend systems for a bio-chemistry online experiment platform, including AI-assisted online experiment workflows. Optimized data retrieval pipelines to achieve 4–10× performance improvements and designed documented RESTful APIs consumed by internal teams and third-party integrations.
Freelance Engineer
Independent
Apr 2021 - May 2023 (2 years 1 month)
Delivered multiple production blockchain-based web applications for individual and business clients while meeting deadlines across concurrent projects. Built SPA frontends with Next.js, React, and Vue.js, and independently managed client communication, requirements gathering, and technical scoping.
Software Engineer
VTRON Technology
Oct 2019 - Mar 2021 (1 year 5 months)
Developed full-stack web applications as part of a cross-functional engineering team, contributing to frontend and backend feature development. Worked within an Agile workflow and supported delivery of product changes from design through implementation.
Education
Degrees, certifications, and relevant coursework
Hong Kong University of Science and Technology
Bachelor of Information Science, Information Science
Earned a Bachelor of Information Science degree at the Hong Kong University of Science and Technology, graduating in April 2015.
Tech stack
Software and tools used professionally
Availability
Location
JapanAuthorized to work in
Job categories
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