Back End Developer

Backend Engineer – Scalable Payment Systems ( full remote )

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 applications
• Work with cloud infrastructure to optimize performance and reliability
• Own your code from development through production support
• Contribute to tooling and open-source projects where relevant

Tech Stack Highlights:

Java / Kotlin / Scala, Spring Boot, Kafka, Redis, MySQL, DynamoDB, Docker, Kubernetes, AWS, GCP, GitHub, Jenkins, BigQuery

Requirements:

• 3+ years of Java experience
• Solid grasp of algorithms, data structures, and OOP
• Experience with NoSQL and distributed caching
• Understanding of concurrency and distributed systems
• Proficiency in English and Japanese ( business level )

Nice to Have:

• Experience with APIs, pub/sub, AWS services, or financial systems
• Familiarity with microservices and high-scale architectures