Appealing Points:
- Build and optimize high-throughput, low-latency distributed systems supporting global multi-channel communication workloads.
- Work with modern technologies including Java/Golang, Kubernetes, microservices, CI/CD, API-first architecture, and cloud-native systems.
- Leverage LLM-based AI development tools such as Claude and Codex to improve code quality, automate documentation, and accelerate development workflows.
Annual salary : 7 Million Yen and Above.
Job Responsibilities:.
- Design, implement, and optimize microservices for multi-channel communication workloads.
- Build and enhance backend capabilities supporting messaging, identity, verification, and communication APIs.
- Develop high-throughput, low-latency services for global CPaaS traffic.
- Design database schemas, optimize queries, and ensure database performance.
- Deploy and operate services on Kubernetes, ensuring resilience, scalability, and cost efficiency.
- Build scalable REST APIs and contribute to API-first product architecture.
- Manage version-controlled CI/CD pipelines for build validation, automated testing, and safe deployments.
- Use LLM-based tools such as Claude and Codex to improve code quality, automate documentation, and accelerate development workflows.
- Ensure system visibility using Grafana, Prometheus, and structured logging.
- Collaborate with Product Managers, QA, DevOps/SRE, and UI/UX teams to deliver high-quality features.
- Maintain coding standards, conduct code reviews, and continuously improve engineering practices.
Job Qualifications:
- 5+ years of hands-on backend development experience.
- Strong proficiency in Java or Golang.
- Expertise with Postgres and MySQL.
- Hands-on experience with Kubernetes and containerization.
- Experience with CI/CD pipelines, with GitHub Actions preferred.
- Experience with microservices and API-first system design.
- Proficiency in leveraging LLM-based tools for coding, automation, and workflow acceleration.
- Advanced English proficiency, including strong communication, documentation, and collaboration skills.
Preferred Qulifications:
- Domain experience with communication protocols such as SMPP, SIP, REST APIs, and WebRTC.
- Experience across multiple CPaaS domains including SMS, Email, Voice, Passkey, Authentication Services, WhatsApp, LINE, and RCS.
- Ability to work effectively in fast-moving, high-autonomy environments.
Language Requirements: Advanced level English - strong communication, documentation, and collaboration skills.
About Company:
The largest eCommerce company in Japan, and the third-largest eCommerce marketplace company worldwide. The organization provides a variety of consumer and business-focused services including e-commerce, e-reading, travel, banking, securities, credit card, e-money, portal and media, online marketing, and professional sports. The company is expanding globally and currently has operations throughout Asia, Western Europe, and the Americas.
[Measures against passive smoking]
No smoking indoors allowed
Designated smoking area
. Skillset Required: Java, Golang, Kubernetes, microservices, CI/CD, API-first architecture, cloud-native systems, LLM-based AI development tools, Claude, Codex, backend development, messaging APIs, identity APIs, verification APIs, communication APIs, high-throughput service development, low-latency service development, database schema design, Postgres, MySQL, query optimization, database performance, Kubernetes deployment, scalability, cost efficiency, REST APIs, version-controlled CI/CD pipelines, build validation, automated testing, safe deployments, Grafana, Prometheus, structured logging, coding standards, code reviews, engineering practices, communication protocols, SMPP, SIP, WebRTC, SMS, Email, Voice, Passkey, Authentication Services, WhatsApp, LINE, RCS, English communication, documentation, collaboration
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