Back End Developer

Backend Engineer – Scalable Payment Systems We're hiring a backend engineer to help build high-performance payment infrastructure that delivers fast and reliable experiences to millions of users.Responsibilities:Design and build scalable backend systems for high-throughput applicationsWork with cloud infrastructure to optimize performance and reliabilityOwn your code from development through production supportContribute to tooling and open-source projects where relevantTech Stack Highlights:Java / Kotlin / Scala, Spring Boot, Kafka, Redis, MySQL, DynamoDB, Docker, Kubernetes, AWS, GCP, GitHub, Jenkins, BigQueryRequirements:3+ years of Java experienceSolid grasp of algorithms, data structures, and OOPExperience with NoSQL and distributed cachingUnderstanding of concurrency and distributed systemsProficiency in English and Japanese ( business level )Nice to Have:Experience with APIs, pub/sub, AWS services, or financial systemsFamiliarity with microservices and high-scale architectures