Java/Kotlin Engineer （Senior/Principal）

Responsibilities and Duties

As 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.

Must have

• Approximately 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 have

• Experience 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. (More information )

Language Requirements

• English: Business level (TOEIC score of 700 or above)

Who We’re Looking For

• Ability 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 Used

• Kotlin, Spring Boot, Gradle, jOOQ, Liquibase, Kotest/JUnit, Karate/Rest Assured
• Redis, MySQL
• Docker, AWS ECS
• Apache Kafka (AWS MSK)
• Mambu cloud banking platform
• GitHub, Backstage, Amazon ECR
• GitHub Actions, ArgoCD, Sonar Cloud, Detekt, AeyeScan
• ChatGPT, Copilot, Gemni

Our benefits 

Caring Mental & Physical Recreation:

• Hybrid working: 2 days at the office and 3 days WFH
• Working hour: Flexible start 8AM-9AM from Mon-Fri
• Full salary in probation
• Insurance: Applied from Probation period:
• Social Insurance, Health Insurance, Unemployment Insurance (on 100% salary)
• Private health insurance & accident insurance. From Managing level: extra for family members
• Bonus: 13th month salary
• 16 - 24 paid days off and more
• Paternity leave: Extra 5 days
• Annual company trip; Quarterly team building
• Billiards & Running club
• Annual health check
• Well-equipped facility: Macbook pro, additional monitor,..

Caring Career & Development:

• Clear Career path
• Foreign language & International technology-related certifications sponsoring
• External & internal training courses
• Soft-skill workshops
• Tech seminars
• Monthly and biannual Recognition Awards
• Performance & salary review: twice/year (Jun & Dec)