Senior Backend Engineer (Cloud Box)

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

About Money Forward

Money Forward Minato-ku, Tokyo

Money Forward is a fintech startup delivering tools to visualize and improve both individuals'​ and companies'​ financial health.

Key benefits

  • Small but diverse team
  • Great support for OSS
  • Relocation support

About the position

As a Senior Engineer, you will be responsible for developing “Money Forward Cloud Box”, leading projects primarily using Ruby on Rails.

About Cloud Box

Cloud Box is a cloud file storage for back-office use. It makes it easy for anyone to save documents like invoices and receipts as digital data, following legal requirements. It also uses OCR technology to automatically recognize details like transaction partners and amounts from uploaded files. Our mission is to digitize and greatly improve the efficiency of back-office tasks.

In recent years, many laws promoting the digitalization of documents like invoices and receipts have been amended. For example, after the amendment of the Electronic Record Retention Law, it’s now possible to store these documents in Cloud Box and legally dispose of the original paper copies, which had to be stored for seven years before. This eliminates the need for businesses with many transactions to rent storage spaces for these documents. It also removes the hassle of manually writing titles on receipts and submitting them to accounting.

Cloud Box plans to develop many features to maximize the use of these legal changes and not just comply with legal requirements, but also to use technology for more efficient operations. These include efficiently collecting document data from emails, websites, and even postal mail, analyzing uploaded documents for type and amount, smoothly linking data for expense reports and accounting, and implementing user interfaces for easy management of analyzed document data.

Cloud Box also acts as a microservice. It provides APIs to other Money Forward Cloud products like Cloud Accounting and Cloud Invoicing, enabling them to store and analyze documents. With the increasing digitalization of documents, the use of these APIs is rapidly growing. Developing high-performance and scalable APIs is a major development topic for the future.

In Cloud Box, we form small teams consisting of product managers, engineers, and designers for product development. Engineers and designers, not just product managers, are encouraged and expected to actively contribute ideas for making specifications. We are looking for team members who will join us in using technology to its fullest to digitize back-office tasks and achieve overwhelming efficiency.


  • Develop and maintain B2B SaaS web applications called Cloud Box with Ruby on Rails.
  • Develop and maintain microservices related to Cloud Box with Golang.
  • Write scalable, robust, testable, efficient, and easily maintainable code.
  • Develop features that are necessary for Mid to Enterprise companies, including permissions, project, and internal control functionalities. Design and tune systems to handle large-scale traffic without issues.
  • Possess a deep understanding of the users and propose and implement features from a technical perspective to optimize UX and DevX.
  • Collaborate with team members, Engineering Manager, Product Manager, and any other stakeholders.
  • Lead the improvement of the team’s development productivity. Influence other teams positively through knowledge sharing and best practices.
  • Support the growth of junior to mid-level engineers through hands-on teaching and coaching, thereby maximizing the team’s output.
  • Strive to maximize the value of the Money Forward series through cross-departmental collaboration.


  • Computer Science / Engineering Bachelor’s degree or related technical field.
  • 4+ years of hands-on experience in designing, developing, and operating web applications including adding new features with any programming language.
  • 3+ years of development experience for frontend side (preferably Next.js, but other frontend fullstack frameworks are welcomed such as Nuxt.js or Remix.js).
  • 1+ years of development experience for backend side (preferably Ruby on Rails, but other frameworks are welcomed such as Spring, Ktor, Node.js, etc..).
  • Successful track record of developing quality software products and shipping production-ready software.
  • Proven track record of actively participating in team-based quality improvement efforts through code reviews and test code implementation.
  • Excellent communication skills, both verbal and written, with the ability to effectively communicate technical concepts to stakeholders.
  • Demonstrated leadership abilities, including the ability to mentor and guide less experienced developers.
  • Experience in managing incident response, including efficient discovery, thorough investigation of root causes, prompt resolution, and implementation of permanent solutions
  • Experience in working with Scrum and Agile development methodologies, contributing to efficient and collaborative project delivery.
  • A shared belief in Money Forward’s Mission/Vision/Values/Culture.
  • Motivation to learn Japanese

Nice to haves

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

  • Experience for team lead or management of team.
  • Experience designing and architecting complex software systems, with a focus on security, performance, and maintainability.
  • Experience in designing and developing microservices. Have a strong understanding of domain modeling.
  • Experience in various layers beyond backend development, ranging from Public Cloud and Kubernetes resource management to front-end development, or a keen interest in these areas.
  • Experience of Ruby on Rails
  • Experience of microservice development


7 to 10 million JPY annually.

Hiring Process

  1. 1

    Document Screening / Casual Meeting

  2. 2

    Technical Assignment

  3. 3

    First interview

  4. 4

    Final interview

    Reference checks may be required before or after the interview.

  5. 5

    Job offer and Meeting


Meet Money Forward's Developers

Kostas Mavrikis left the Netherlands to join Money Forward in October 2023. As the first non-Japanese speaker in the Fukuoka office, he's been taking the initiative on Money Forward's Englishnization program, as well as introducing Kotlin, Scrumban, and European-style coffee meetings to his team.

Read his story...

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