Backend Development Engineer -CPaaS Business Department (RS Product Delivery & Innovation Div)
Rakuten Symphony · JP
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About the Role
We are building the next generation of our CPaaS platform, a robust ecosystem powering multi-channel communication services. Our platform supports global traffic across SMS, Email, Voice, WhatsApp, LINE, RCS, Passkey, and advanced Authentication services. We are looking for a highly skilled Backend Engineer to drive the scalability, reliability, and evolution of these services within a high-autonomy, fast-paced R&D environment.
Responsibilities
- Design, implement, and optimize microservices powering 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 schemas, optimize queries, and ensure peak performance across databases.
- Deploy and operate services on Kubernetes, ensuring resilience, scalability, and cost-efficiency.
- Build clean, scalable REST APIs and contribute to API-first product architecture.
- Manage version-controlled pipelines for build validation, automated testing, and safe deployments.
- Utilize LLM-based tools (e.g., Claude, Codex) to improve code quality, automate documentation, and accelerate development workflows.
- Ensure system visibility using Grafana, Prometheus, and structured logging.
- Partner with Product Managers, QA, DevOps/SRE, and UI/UX teams to deliver high-quality features.
- Uphold coding standards, conduct code reviews, and drive continuous improvement of engineering practices.
Requirements
- 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 (GitHub Actions preferred).
- Experience with Microservices and API-first system design.
- Proficient in leveraging LLM-based tools for coding, automation, and workflow acceleration.
- Advanced English proficiency (strong communication, documentation, and collaboration skills).
- Domain experience with communication protocols (SMPP, SIP, REST APIs, WebRTC).
- Experience across multiple CPaaS domains (SMS, Email, Voice, Passkey, Auth Services, WhatsApp, LINE, RCS, etc.).
- Proven ability to work effectively in fast-moving, high-autonomy environments.
Skills
- Java
- Golang
- Postgres
- MySQL
- Kubernetes
- Containerization
- CI/CD
- GitHub Actions
- Microservices
- API-first system design
- LLM-based tools
- Claude
- Codex
- Grafana
- Prometheus
- Structured logging
- SMPP
- SIP
- REST APIs
- WebRTC
- CPaaS
- SMS
- Voice
- Passkey
- Auth Services
- LINE
- RCS
Experience Level
- 5+ years of hands-on backend development experience
About the Company
- We are building the next generation of our CPaaS platform, a robust ecosystem powering multi-channel communication services. Our platform supports global traffic across SMS, Email, Voice, WhatsApp, LINE, RCS, Passkey, and advanced Authentication services.