Backend Engineer (Money Forward Kakebarai), Money Forward Kessai,Tokyo

Money Forward Kessai was established in March 2017 with the mission of making inter-company transactions safe and seamless, aiming to become the payment infrastructure for such transactions. The company offers services like "Money Forward Kakebarai" and "Money Forward Early Payment," handling over 280 billion yen in transactions.

Additionally, Money Forward promotes cashless transactions through "Money Forward Pay for Business," providing the "Money Forward Business Card" for sole proprietors and corporations. In March 2025, to enhance value in SaaS and Fintech, "Money Forward Pay for Business" was consolidated into Money Forward Kessai. This consolidation aims to improve business operations and governance, and to promote agile business strategies, including obtaining necessary permits.

This position will be employed by Money Forward and seconded to Money Forward Kessai.

The complexity of invoices and the need for early funding will never disappear as long as there are business transactions. 
B2B services need careful attention, and billing operations have different rules and customs based on the industry and company.
We aim to visualize and streamline these needs through technology, and our business activities revolve around the theme of creating new businesses using the accumulated business data. 
Additionally, we focus on corporate credit and data utilization, which directly impact credit accuracy and speed.

As a result, we are not just a billing agency service; we handle everything from credit to payment and merchant development, similar to how the credit card industry manages all positions in-house. 
"Kessai" is a broad concept closely related to data business, and our service's strength lies in its ability to transform such broad payments from the operational level.

We are seeking a backend engineer to lead the development of a service that continuously and rapidly enhances value through technology selection, architecture design, and application development in our core business of inter-company post-payment services. The goal is to create a service that allows client companies to conduct transactions with peace of mind.

The mission includes solving the challenges faced by current client companies and developing features to address obstacles for companies planning to implement the service.

Responsibilities and Duties

Design the architecture, select technologies, implement, release, and continuously improve the service "Money Forward Kakebarai," that is primarily operated on Google Cloud.

• Continuously find the challenges and reflect the changes into product features.
• Plan how the product will operate before development and communicate within the team.
• Create systems and operations that could quickly solve troubles
• Learn new technologies and share knowledge internally and externally.
• Enjoy learning and taking on challenges to solve problems together as a team.

By using the latest technology that is evolving everyday, we believe we can achieve more efficient and scalable product development. 
New challenges are emerging, such as observability issues with serverless architecture and boundary problems as microservices expand. We would like to work with someone who  anticipate and address these challenges, ensuring the product can continue operating smoothly.

Development Methodology

We use Scrum methodology for development, focusing on creating prototypes with chosen architectures and technologies rather than spending too much time on planning. With this, we aim for small, frequent releases. 
Our one-week sprints incorporate GitOps for faster delivery, enabling release cycles at the PR level. 
Since we handle financial transactions, it's crucial to ensure the service functions correctly, not just adequately. Development must consider handling errors, retry methods, and responses to issues.

Technology Stack

The technology stack we use includes the following. While these are not mandatory skills at the time of application, you will be expected to work using these technologies.

• Languages: Go, TypeScript
• Frameworks: Nuxt.js, Remix, Nest.js, gRPC, GraphQL, OpenAPI Specification (Swagger)
• Databases: MySQL, BigQuery, Datastore
• Middleware: Docker, Kubernetes, Envoy, Kong, OpenCensus/OpenTelemetry
• Cloud Infrastructure/Services: GKE, Cloud Run, Cloud Functions, Cloud Storage, Cloud Pub/Sub, Cloud Operations, Firebase Authentication, SendGrid, Datadog, Sentry
• CI/CD: Cloud Build, Github Actions

We are using more microservices in our architecture, which means we focus on how different services communicate with each other. This approach involves solving typical issues related to microservices and distributed systems. Where the scalability is required, we use serverless architecture with Cloud Run.

Required Skills and Experience

• Experience developing with a web application framework, regardless of language
• Experience developing applications using RDBMS
• Experience developing with Golang or an interest in Golang
• Experience operating services long-term using cloud platforms like AWS or GCP
• Experience using container technologies like Docker

Language Requirements

• Business-level Japanese proficiency (equivalent to JLPT N1).
• Business-level English proficiency (equivalent to TOEIC score of 700 or higher)
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  • If you do not have a TOEIC certificate taken within the last two years with a score of over 700, you will be required to take an English test during the selection process.
    • Examples: Eiken Pre-1st Grade, TOEFL iBT 60 or higher, IELTS 5.0 or higher, Cambridge English FCE, etc.