This position is closed and is no longer accepting applications.

Backend Developer

Jamm Minato-ku, Tokyo
  • 💴 ¥7M ~ ¥10M annually
  • 🏡 Partially remote
  • 🧪 5+ years experience required
  • 💬 No Japanese required
  • 🌏 Apply from abroad
  • 🧳 Relocate to Japan

About Jamm

Jamm Minato-ku, Tokyo

Jamm is a fintech company operating in the payments space. We have received pre-seed investment from 3 VCs (DCM Ventures as lead), and are underway developing an MVP that allows for smooth customer to business transactions, without using conventional credit card based payment systems.

Key benefits

  • We're replacing credit cards
  • Stellar investment team
  • International from the start

About the position

We are looking for an experienced backend engineer to develop a payments MVP that minimizes time to launch, is robust and scaleable.


  • Work in close contact with the Engineering Manager to design and implement various parts of a payment backend system that meet product goals.
  • Implement scaleable, fault-tolerant payment functions that allow for future growth.
  • Understand future product risk and implement functions that minimize technical debt while maximizing deployment speed.
  • Communicate with other Engineers, Design, Product Management members.
  • We use Java/Kotlin with Micronaut for backend, React for frontend and PostgreSQL for DB.


  • 5+ years of professional working experience
  • 2+ years at a single company
  • Experience independently driving and delivering parts of a product based on overall product roadmaps.
  • Ability to create product features without much guidance, which are robust, scaleable, while understanding tradeoffs between speed and quality.
  • Ability to create documentation for product for communication between different parts of the organization.

Nice to haves

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

  • Experience developing in the fintech/payments space.
  • Java/Kotlin experience.
  • Experience working at an early stage startup.


7 to 10 million JPY annually + stock options.

Hiring Process

  1. 1

    Resume Screening

    We will check if your experience and skillset match the position requirements.

  2. 2

    Casual Meeting with CEO

    We will set a 60 minute discussion to share business model specifics from us, and ask questions to understand candidate preferences.

  3. 3

    Coding interview

    There will be a 60 minute coding interview with one of our engineering members.

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