Senior Backend Engineer (Kotlin, HR Solutions Department), Tokyo (TokyoDev)

Overview

Money Forward aims to move people’s lives forward by offering various SaaS applications for Back-office operations and eliminating non-essential work from complex daily tasks, and radically changing the quality of and time spent on work.

In the HR domain, we are providing the following six products;

• Money Forward Cloud Payroll
• Money Forward Cloud My Number
• Money Forward Cloud Attendance
• Money Forward Cloud Social Insurance
• Money Forward Cloud HRIS (Human Resource Information System)
• Money Forward Cloud Tax Adjustment

As a Senior Backend Engineer, you will be responsible for leading projects primarily using Kotlin. Our products are currently in its growth phase, so we are actively seeking someone who can design an architecture and development strategy to accommodate future user expansion at scale.

Responsibilities

• Design, develop, and maintain high-performance backend systems with Kotlin or Java, ensuring scalability and reliability.
• Engage in collaborative efforts with cross-functional teams to conceptualize, architect, and implement new features that enhance our SaaS offerings.
• Understand existing features and define the best short, medium and long term strategy to migrate or re-architect systems to support our SaaS platform’s growth and scalability for.
• Identify and address issues which affect our products and lead the efforts to implement solutions across teams by making key technical decisions which define our future engineering direction.
• Proactively identify and address cross-product performance bottlenecks, ensuring the efficiency and responsiveness of our services.
• Design and implement robust and maintainable APIs that support both internal and external integrations.
• Work closely with product managers, designers, and fellow engineers to understand requirements and deliver high-quality solutions.
• Proactively engage in knowledge sharing across teams and the organization, promoting a culture of learning and development.
• Create and maintain technical documentation for systems, APIs, and processes.
• Collaborate with support teams to troubleshoot and resolve technical issues promptly

Required Skills and Experience

• Bachelor's degree in Computer Science, Engineering, or a related technical field.
• 5+ years of hands-on experience in designing, developing and operating web applications using the latest, production proven, Kotlin or Java technologies.
• Experience with design, development, and operation of service-oriented or microservices architecture, demonstrating an understanding of scalable and modular architecture.
• Experience in architecture design and technology selection, showcasing the ability to make informed decisions for optimal solutions.
• Demonstrated ability to independently analyze, design, and refactor using various design patterns and identify and address anti-patterns.
• Proficiency in tuning middleware components, including database optimization and performance improvement strategies.
• Flexibility and adaptability to work with diverse technology stacks, with motivation to learn technologies like Ruby on Rails, Frontend frameworks and others in order to optimize our new systems.
• Proven track record of actively participating in team-based quality improvement efforts through code reviews and test code implementation.
• Hands-on experience with test design, creation, and operation using documentation or testing tools like JUnit, Kotest, RSpec, Jest, or similar.
• Experience in mentoring other engineers, demonstrating the ability to guide and support fellow team members in their professional growth.
• Experience in managing incident response, including efficient discovery, thorough investigation of root causes, prompt resolution, and implementation of permanent solutions.

Preferred Skills and Experience

• Familiarity with Ruby, Ruby on Rails, React or Vue.js.
• Experience with containerization and orchestration tools such as Docker and Kubernetes.
• Experience with event driven architectures and similar patterns to optimize performance across our systems.
• Previous experience working with Scrum and Agile development methodologies, contributing to efficient and collaborative project delivery.
• Previous exposure to a SaaS environment will be considered an advantage.

Language Requirements

• English: Fluent in both written and spoken
• Japanese: Not required (Interest in learning is a plus)

Technology Stack

• Backend: Kotlin, Java, Ruby, Ruby on Rails, GraphQL, gRPC, Sidekiq Pro, RSpec
• Frontend: TypeScript, Next.js, Vue.js, Nuxt.js, Jest
• Infrastructure: Amazon EKS, Aurora, ElastiCache, S3
• Infrastructure as Code: Terraform
• Repositories: GitHub
• Project management: JIRA
• Monitoring: Datadog, Rollbar
• CI/CD: CircleCI, ArgoCD, GitHub Actions
• Communication Tools: Zoom, Slack, Figma, Miro

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.