Things I've built to solve real problems.

These are some of the projects I've worked on professionally and in my spare time. I focus on backend systems, APIs, and tools that make a measurable impact.

My recent works

  • Honnetenshoku

    Honnetenshoku

    Japanese workplace review platform enabling job seekers to research companies through verified employee reviews, salary data, and work-life balance ratings. Built the backend APIs, analytics engine, and AWS infrastructure powering the platform.

    honnetenshoku.com

  • Universell

    Universell

    All-in-one business operating system unifying CRM, POS, inventory, e-commerce, and marketing tools for small businesses. Built the Go microservice backend, event-driven architecture, and the React-based Lead management interface.

    universell.us

  • PTO CLI

    An open-source PHP command-line tool for accurately calculating remaining paid time off days under German labour law, with support for accrual policies, part-time scaling, state-specific public holidays, and carry-over caps.

    github.com

  • Maunawai

    Maunawai

    Swiss premium water filter e-commerce platform. Led development of the payment module and checkout flow, and built the analytics and sales reporting systems used by the business team.

    maunawai.com