Principal Java/Kotlin Engineer (Spring Boot)

Who we are?Money Forward is embarking on an exciting new venture in collaboration with Sumitomo Mitsui Financial Group and Sumitomo Mitsui Banking Corporation to explore the provision of BaaS (Banking as a Service) and digital banking solutions. We are seeking a talented Backend Engineer to join our core banking team, which will be at the heart of this initiative. This role expects a strong security mindset, with a clear understanding of data privacy, credential protection, device security, and the responsible use of corporate systems, tools, and accounts.Responsibilities and DutiesAs a Software Engineer in the Core Banking Team, you will leverage Mambu, a leading cloud banking platform for neobanks and challenger banks, to build one of the most reliable and agile banking systems in the industry. Our goal is to shape the future of digital banking in Japan, making it more accessible and user-friendly than ever before.Acquire domain knowledge in digital banking, including deposits, loans, clearing and settlement, basic accounting, domestic exchange, and Zengin network.Actively engage with product owners to define requirements.Develop, test, and deploy code that meets non-functional quality gates such as static code analysis, software composition analysis, SAST, and DAST, while maintaining numerical accuracy.Design and build high-performance, scalable microservices centered around APIs.Pursue test automation and continuous improvement, including API testing.Take responsibility for the entire software development lifecycle.Your Skills and ExperienceMust haveApproximately 5 years of hands-on experience with Java or Kotlin and Spring Boot.Practical experience with SQL, Apache Kafka, and related technologies.Experience in creating and automating tests.Hands-on experience with relational/non-relational databases, including transaction management, query optimization, and schema design.Experience in microservice architecture and API design with a focus on scalability, maintainability, and supportability.Proven experience in development with sufficient domain knowledge (not necessarily in the financial industry).Understanding of CI/CD concepts and practices.Experience developing cloud-native applications in major cloud environments such as AWS, Azure, or GCP.Bachelor's or Master's degree in Computer Science or a related field, or equivalent practical experience.Nice to haveExperience working in financial institutions, particularly banks or fintech companies.Basic knowledge of accounting or double-entry bookkeeping.Knowledge of CCP and settlement mechanisms.Experience implementing CI/CD pipelines from development to production in the cloud.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 RequirementsEnglish: Business level (TOEIC score of 700 or above)Who We’re Looking ForAbility to quickly adapt to changing priorities and situations.A critical thinker who questions the status quo.Excellent communication skills with the ability to articulate ideas clearly.Willingness to learn necessary domain knowledge and technologies.Understanding of DevOps/DevSecOps.Technology Stack and Tools UsedKotlin, Spring Boot, Gradle, jOOQ, Liquibase, Kotest/JUnit, Karate/Rest AssuredRedis, MySQLDocker, AWS ECSApache Kafka (AWS MSK)Mambu cloud banking platformGitHub, Backstage, Amazon ECRGitHub Actions, ArgoCD, Sonar Cloud, Detekt, AeyeScanChatGPT, Copilot, Gemni