Fullstack Engineer

Mantra Bunkyo City, Tokyo April 29 2026
  • 💴 ¥6M ~ ¥10M annually
  • 🏡
    Partially remote
  • 🗾 Japan residents only
  • 💬
    Business Japanese
    Business English
  • 🧪
    Intermediate level
    3+ years experience required
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About Mantra

Mantra Bunkyo City, Tokyo

We want to make manga accessible to people regardless of what language they speak. That is why we're researching new machine translation solutions and developing an English-language learning service based around manga.

Key benefits

  • Intersection of tech and entertainment
  • Global team
  • Health first

About the position

Mantra provides “Mantra Engine,” a cloud service for corporations specializing in manga translation. Beyond Mantra Engine as a SaaS solution, we also undertake various projects related to the overseas expansion of entertainment content with publishers, distributors, and other partners.

The B2B business development team currently consists of a small team of one full-time member and several contractors. As the team grows, we face new challenges: building a stable system capable of scaling and establishing robust development processes. We are seeking an engineer to lead Mantra’s B2B business development team.

Responsibilities

  • Design, development, and operation of web services, including technical decision-making
  • Management of the engineering team (approximately 4 members, primarily contractors)
  • Building and managing development roadmaps based on business strategy and goals
  • Improving development processes and eliminating technical debt to enhance productivity.
  • Identifying user challenges and defining feature specifications based on user interviews and data analysis
  • Lead development-focused projects (e.g., API specification discussions with clients)

Requirements

  • Experience in designing backend APIs and database schemas for commercial services of a certain scale.
  • Hands-on experience in implementing web services from frontend to backend.
  • Experience leading the end-to-end development process of a service, from feature specification and implementation to testing and release.
  • Conversational Japanese language skills. You’ll occasionally speak with our clients in Japanese, but we don’t expect you to be fully fluent in the language.

Nice to haves

While not specifically required, tell us if you have any of the following.

  • Experience as an Engineering Manager or Technical Lead.
  • Experience in designing, operating, and constructing backend and infrastructure for large-scale services.
  • Experience in promoting agile development processes such as Scrum.

Compensation

¥6,000,000 ~ ¥10,000,000 annually.

Hiring Process

  1. 1

    Document screening

    We’ll review your application.

  2. 2

    About three interviews

  3. 3

    Final meeting

    We’ll discuss terms of employment and compensation.

APPLY FOR THIS POSITION
DO YOU NEED MORE INFO?
ASK A QUESTION

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