Backend Engineer (Langaku)

Mantra Bunkyo City, Tokyo April 29 2026
  • 💴 ¥6M ~ ¥9M annually
  • 🏡
    Partially remote
  • 🗾 Japan residents only
  • 💬
    Conversational 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

At Mantra, we developed “ Langaku,” a smartphone English learning app that combines manga and technology. To further evolve this growing product, we are seeking app engineers to help us development and maintain the backend of our mobile applications.

Technical Stack

  • Frontend: Swift (iOS), Flutter (Android)
  • Backend: Python
  • Infrastructure: AWS, GCP

Responsibilities

  • Develop and maintain the backend for mobile applications.
  • Enhance productivity and quality through automation of testing and operations.
  • Build, maintain, and operate infrastructure and data analysis platforms.
  • Analyzing user challenges and validating hypotheses
  • Collaborate with product managers and designers to design user experiences and features that solve user problems.
  • Building and managing development schedules and making technical decisions

Requirements

  • 3+ years of experience in backend development for mobile applications.
  • Experience with databases.

Nice to haves

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

  • Experience in data analysis and building data analysis platforms.
  • Experience in building and operating infrastructure using AWS.
  • Knowledge and experience with server-side development using Django.
  • Experience in developing consumer-facing mobile applications.
  • Basic knowledge and experience in machine learning.

Compensation

¥6,000,000 ~ ¥9,000,000 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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