As a core member of the Messaging Platform team, you will design, implement, and operate scalable backend services that process billions of messages daily.
About this role
This senior/staff backend engineering role sits within LINE's Messaging Platform team, responsible for designing, implementing, and operating highly scalable and reliable backend services that handle tens of billions of messages per day across the LINE ecosystem. Responsibilities include leading the design of scalable backend features and APIs, architecting distributed systems for scalability and fault tolerance, collaborating with Product, SRE, and Security teams, driving improvements to test automation, monitoring, and incident response, mentoring engineers, and shaping long-term technical architecture and standards. The role may include on-call responsibilities for 24/365 service availability. Candidates need demonstrated experience architecting distributed systems in high-traffic environments, strong proficiency in Java, Kotlin, or Scala, experience leading complex cross-functional projects, and fluency in written and spoken English or Japanese. Preferred experience includes Redis, MongoDB, Apache Kafka, SRE practices, security engineering, CI/CD, Prometheus/Grafana/Elasticsearch observability tooling, and Kubernetes. The position is based at the Akasaka Office in Tokyo, offers a flextime system with no core hours, and an expected annual salary of JPY 12,000,000 to 20,000,000 with bonuses granted up to twice a year.
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