Senior Backend Engineer (Principal/Tech Lead)

Responsibilities

• Design and develop large-scale systems to support high throughput applications with complex requirements.
• Utilize infrastructure effectively to address scalability challenges.
• Contribute to open source projects and develop tools to improve system efficiency.
• Embrace problem-solving as a core practice, focusing on root cause analysis and providing ongoing support for production code.

Tech Stack

Our technology stack may vary based on project needs. Currently, we utilize:

• Programming Languages: Java, Kotlin, Scala
• Frameworks and Tools: Spring Boot, JUnit, Resilience4j, Feign
• Databases: MySQL/AuroraDB, DynamoDB, ELK, Kafka, Redis, TiDB
• Deployment and Orchestration: Docker, Kubernetes, ArgoCD, AWS, GCP
• Development Tools: GitHub, IntelliJ, Gradle, Maven, npm/yarn, Flyway, Jenkins
• Data Analytics: BigQuery, Kibana, Spark
• Diagramming Tools: PlantUML, draw.io, miro.com
• Communication: Slack, Zoom

Qualifications

• Proficiency in Java or equivalent programming languages (Scala, Python, Go).
• Eagerness to learn new languages and technologies as required.
• Experience with SQL and NoSQL databases, as well as distributed caching.
• Strong understanding of data structures, algorithms, and object-oriented programming principles.
• Knowledge of concurrency and distributed computing.
• Hands-on experience with RESTful APIs, Pub/Sub Systems, and Database Clients.
• Familiarity with microservices architecture.
• Previous involvement in designing and maintaining high-traffic systems.
• Bachelor's degree in Computer Engineering, Computer Science, or equivalent experience in SaaS platform development (minimum 5 years).
• Fluent in English or Japanese.

Preferred Qualifications

• Previous experience in developing new products from inception.
• Ability to design systems compliant with legal and security standards, with strong leadership skills for requirement identification.
• Experience in improving system resilience and implementing disaster recovery strategies.
• Awareness of market trends and needs, prioritizing speed and quality through MVP approaches.
• Track record of delivering products within tight deadlines.
• Commitment to continuous product improvement post-launch.
• Strong cost-efficiency mindset with effective system cost analysis skills.
• Willingness to share experiences and foster a culture of learning and improvement.
• Experience in finance, payment, or related industries.
• Additional language proficiency in Japanese and English is a plus.
• Experience with AWS services.