Senior Full-Stack Engineer (Ruby), Money Forward Cloud, Tokyo/Fukuoka

Relocation Support Available! Overview At Money Forward, we provide services that solve financial challenges through technology. Our flagship services, "Money Forward Cloud Expense" and "Money Forward Cloud Payable," are used by a wide range of customers, from sole proprietors to large enterprises. As we scale up in the future, we need to quickly deliver new features to meet user needs, while simultaneously maintaining stable operations and a high quality of service. Achieving this requires not just development speed, but also exceptional application design and effective team development practices. Therefore, we are currently seeking a Senior Engineer who possesses deep knowledge of web application architecture and development methodologies to lead our team from both a technical and organizational standpoint. Main Responsibilities As a senior engineer for the corporate SaaS products "Money Forward Cloud Expense" and "Money Forward Cloud Accounts Payable," you will play a pivotal role in driving leverage across both the product and the organization. Beyond standard feature development, you will be expected to untangle complex business requirements, translate them into long-term maintainable architectures, and provide technical leadership for the team. Required Skills and Experience 5+ years of experience in developing and operating large-scale backend systems, ideally using Ruby on Rails or similar frameworks. Hands-on experience building modern frontend applications with SPA frameworks using React, Vue.js, TypeScript, etc. Proven experience defining functional and non-functional requirements from stakeholder needs, authoring design documentation, and building consensus across the team. Experience providing technical leadership within a development team (e.g., ensuring code quality, establishing code review standards) and mentoring/guiding other team members. Experience implementing automated testing using frameworks like RSpec or Jest, along with the ability to design testing strategies that balance both speed and quality. Preferred Skills and Experience Experience developing with GraphQL Experience in UI/UX design Knowledge of design methodologies such as Design Patterns (GoF), Domain-Driven Design, and Clean Architecture Hands-on experience in Agile development such as Scrum Experience in AI development and/or experience in using AI tools to improve development processes. Money Forward recently announced our AI Strategy roadmap which focuses on improving AI-driven operational efficiencies, as well as integrating AI agents into our products to deliver better value to our users. Language Requirements Basic business level English (equivalent to TOEIC 700 or above) If you do not have a qualification equivalent to TOEIC 700 or above, you may be required to take a company-designated test during the selection process. If you have other qualifications or experiences that demonstrate your English proficiency, please let us know. Japanese proficiency is not required but a willingness to learn is preferred. English is primarily used in our development environment. However, there are a few situations and tasks where communicating in Japanese is necessary. We would like to encourage individuals who are currently learning Japanese or have a strong desire to learn to join our team. Who We’re Looking For Strongly resonates with Money Forward's vision Is interested in invigorating the tech community in Fukuoka Is responsible and committed to tackling challenges, and is dedicated to the growth of both themselves and the organization or service Technology Stack Web Server-Side: Rails, Golang, Node.js, GraphQL Web Frontend: React, TypeScript, Next.js, Redux, Apollo Client, webpack, Jest iOS: Swift, SwiftUI, CoreData, Apollo, ReactorKit, Composable Architecture, Bitrise Android: Java/Kotlin, Android Jetpack, LiveData/ViewModel, Dagger/Hilt, OkHttp3, Retrofit2, Apollo Android Database: MySQL (Aurora) Infrastructure & Middleware: AWS (ALB, EC2, ECS, RDS, S3, SQS, ElastiCache, EKS...), SendGrid, Kinsta, GCP (BigQuery, Firebase, GKE), nginx, Redis, Terraform, etc. Tools Used Business Platform: Marketo, Salesforce, HubSpot Repository Management: GitHub CI/CD: CircleCI, Bitrise, ArgoCD, CodeBuild, GitHub Actions Development Environment: Vagrant, Docker, Terraform Enterprise Monitoring: DataDog, Rollbar, Bugsnag, Sentry, New Relic Communication: Slack Ticket Management: Jira, Asana, Trello, Backlog Security & Automation: OWASP ZAP, Burp Suite, Sider (Brakeman), Snyk, VAddy, Dockle, Trivy Work Environment At Money Forward, we provide an environment where we can create world-class services together, and we are looking forward to welcoming you. Provided PC Specs: We provide PCs equipped with the latest CPUs (MacOS or Windows). Custom-made PCs tailored to business requirements and replacements with the latest OS are also possible. Systems to Enhance the Development Environment: Peripheral devices necessary for work (such as displays, mice, keyboards) can be purchased as office supplies. Money Forward Library: We have a library system where you can freely borrow books, ranging from technical books to management books. Desired books can be purchased at the company's expense. Referral Driven: We cover the cost of recruitment meals. There is a referral reward system. Conference Participation Support: The company partially covers participation in domestic and international conferences, such as RubyKaigi and Google I/O. Work Location We are currently recruiting for this position at the following locations: Tokyo Fukuoka Note for Overseas Applicants: If you are applying from overseas, your assigned work location will be Fukuoka. [UI Turn Support Campaign Ongoing] Money Forward is currently running a campaign to support relocation to our Fukuoka development base! We are offering 500,000 yen to assist with relocation expenses to engineers who join us mid-career and are currently living in Japan (conditions apply).