Senior Backend Engineer (Ruby on Rails)

Overview As a Backend Engineer, you will lead the development of “Money Forward Business Card” a cashless platform that promotes cashless transactions through a variety of payment methods, including card and wallet payments, and streamlines back-office operations. As the scale of the product expands in the future, it will be necessary to provide new functions quickly to meet user needs while at the same time maintaining stable operations and high service quality. To achieve this, not only development speed but also application design and team development methods are important. Therefore, we are looking for someone knowledgeable and experienced in web application construction and development methods. Responsibilities and Duties Develop products and their functions with Ruby. Understand business requirements and design high-level architecture. Create system requirements that include functional and non-functional requirements. Write and test codes. Review codes. Educate team members, like hands-on coding. Collaborate with team members, Engineering Manager, Product Manager, and other stakeholders. Promote globalization of the team. Required Skills and Experience Computer Science / Engineering Bachelor’s degree or related technical field. 3+ years of software development experience. Experience with Ruby on Rails Deep understanding of web service development. Successful track record of developing quality software products and shipping production-ready software. Experience with working in an Agile/Scrum team. Team player. Strong interpersonal skills. Experience in AI development or development using AI tools Preferred Skills and Experience Experience in AI development and/or experience in using AI tools to improve development processes. Money Forward is at a major turning point, shifting "from Cloud to AI." We are currently driving "AX (AI Transformation)"—the next step beyond DX—with the goal of providing "Digital Workers," where AI agents autonomously execute tasks. As we enter a phase of evolving into Japan's No. 1 back-office AI company by integrating AI agents into all of our products in the future, we are looking for individuals who can contribute to AI-driven development and value creation. Language Requirements English: Business level (TOEIC 700+ equivalent) — Capable of participating in meetings and communicating via text/email in English. Please consult with us if you have other qualifications or experience that demonstrate your English ability besides TOEIC. Examples: Eiken Grade Pre-1, Eiken Grade 2 (Eiken CSE Score 1950+), TOEFL iBT 60+, IELTS 5.0+, Cambridge English Exam FCE, etc. Other qualifications and experience demonstrating English ability are open to consultation. Those without a qualification equivalent to TOEIC 700 or higher will be required to take a company-designated exam during the selection process (usually after the first interview). Japanese: JLPT N5 or higher Technology Stack Backend: Ruby on Rails, Golang, Node.js, GraphQL Frontend: React, Typescript, Next.js, Redux, Apollo Client, Jest iOS: Swift, SwiftUI, CoreData, Apollo, ReactorKit, Composable Architecture, Bitrise Android: Java/Kotlin, Android Jetpack (Camera, DataBinding, Navigation etc.), LiveData/ViewModel, Dagger/Hilt, OkHttp3, Retrofit2, Apollo Android Database：MySQL(Aurora) Infra, Middleware：AWS(ALB, EC2, ECS, RDS, S3, SQS, ElastiCache, EKS等), sendgrid, kinsta, GCP (BigQuery, Firebase, GKE), nginx, squid, memcached, kafka, elasticsearch, Fluentd, envoy, Puma,Docker, Redis, Terraform Tools Used Repository Management: GitHub CI/CD: CircleCI, bitrise, ArgoCD, CodeBuild, GitHub Action Development Environment: Docker, Terraform Enterprise Monitoring: DataDog, Rollbar Online Communication: Slack Task Management: Jira 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. Generally, you can choose from standard products (catalog), and if conditions are met, you can apply for non-standard products as well. 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.