Company

Trade name
Doa
Owner
Ryuki Maruyama
Location
Kisarazu, Chiba, Japan
Established
October 2018
Business
Secondhand dealer licence
長野県公安委員会 第481012400049号 (Nagano Prefectural Public Safety Commission)
Qualified invoice issuer number
T3810315051206
Email
[email protected]

Owner's profile

Career and licences of Ryuki Maruyama, who runs Doa.

Career

  1. –

    National Institute of Technology, Kisarazu College, Department of Information Engineering (left before graduating)

    Worked part-time in PC sales while studying there (October 2016 to November 2017).

  2. –

    Web production company

    Client work, such as building WordPress media sites.

  3. –

    IT staffing company

    Placed at client companies, worked on e-commerce sites, business dashboards, a ticketing system and more, from sorting out requirements to code and infrastructure. PHP, Laravel, React, AWS ECS.

  4. – present

    Started Doa as a sole proprietorship

    Development work for clients, and Doa's own services.

  5. –

    Payment service provider

    Ran infrastructure, operations and maintenance as an in-house systems engineer, then moved to the development team. Built the merchant console and payment widget (React), the settlement system (Spring), and payment plugins for EC-CUBE and WooCommerce.

  6. –

    Toyo University, Faculty of Law, Department of Law, evening course (left before graduating)

  7. –

    PRM SaaS company

    On a Scrum team: moved the database and backend from Amplify to MySQL and Laravel, split email delivery out into C# / .NET, and rebuilt the frontend in Next.js with full-text search in Go and OpenSearch. The team won a Findy Team+ Award 2024.

  8. – present

    Auto parts company

    Started on its parts sales SaaS as a contractor, and joined as an employee in June 2026. Works on the API (Laravel), frontend (React, TypeScript), infrastructure (AWS CloudFormation) and data integration (Python).

  9. –

    Vehicle transport company

    Drove three-car carriers and safety loaders. Made regular runs bringing used cars for export into the yard, and trained new drivers on new Lexus deliveries.

Licences

  1. Ordinary motorcycle licence

  2. Ordinary vehicle driving licence (class 1)

  3. Secondhand dealer licence

  4. Medium vehicle driving licence (class 1)

Open source contributions are on Work.