Golang and C++ Developer - BSS Backend Development

Section, BSS Development Department (BSDD) Job Description: Business Overview

The Technology Platforms Division (TPD) drives the growth of Rakuten's ecosystem by delivering innovative, high-quality technology platforms characterized by integrated control and strategic partnerships. Within TPD, the Cloud Platform Supervisory Department (CPSD) develops and manages Rakuten's state-of-the-art cloud platform, empowering global scalability and accelerating innovation across its diverse business units.

Department Overview At the BSS Development Department (BSDD), we are managing and evolving the Business Support

Systems (BSS) platform, a critical backbone of Rakuten Mobile services. The main functions that BSS provides are: end-customer touchpoints (front-ends, mobile applications for onboarding and for plan management), billing and integration with the core systems of Rakuten Mobile.

Just as Rakuten Mobile has disrupted the mobile industry, we're committed to delivering exceptional value to our business partners and end customers by seamlessly leveraging the wide Rakuten Ecosystem. With a long history of software engineering as a service company providing social infrastructure, we value the speed and quality of our delivery to maximize customer satisfaction.

Our mission is to provide a unified BSS platform that spans across the different business lines of our telecommunication businesses. Having just finished the initial build-up phase of the platform, we are actively looking for talented individuals to make our organization and platforms stronger with teams spanning Japan, India, China, and Singapore.

Position: 　 Position Details We are looking for Golang and C++, microservices professional with experience range 8 - 10 years

who can lead the team of 2 to 3 members technically.

Key Responsibilities: - Works with the solution Designer/Architect to understand and clarify business requirements - Develop microservices which are Rest based or Event based using C++, Golang and Kafka - Lead and mentor junior developers and drive them into technical discussions - Coordinate cross-functional teams to deliver on the activities for existing technology solutions - Responsible to do the code reviews with the team members

- Ensuring micro service system architecture is well-maintained as per standards and core principles of

business - Participate in Sprint planning, system architecture, solution design and technical detailed design

meetings - Deliver High Quality Code with adheres to standards and best practices - Present development progress updates to the teams and stakeholders - Be responsible for assessing current software development practices and principles to identify and

implement process improvements Mandatory Qualifications: 8-10 years of experience in software development life cycle including requirement analysis,

development, integration, testing using C++, Golang

Technical Skills: - Very Good understanding and knowledge of Data structures and Algorithms - Good Hands-on experience of web services, Rest APIs and gRPC using Golang - Experienced in implementing applications in Microservices architecture - Strong knowledge of Go programming language, paradigms, constructs, and idioms - Hands on experience in using Maps, Structs, Slices, Interfaces, Methods, Marshal, Un-marshal,

Goroutines, bidirectional channels & directional channels - Developed Kafka consumers & producers to handle events asynchronously - Created dashboards on Grafana and Kibana to monitor application metrics for health, liveliness, and

performances - Worked on integrated GO-Hystrix dashboard to monitor micro-services using Circuit Breaker - Experience with the following Databases like Couchbase DB, MySQL databases - Experience with container orchestration systems like Docker, and Kubernetes - Experience with designing, implementing, and deploying micro services in distributed systems Desired Qualifications: - Experience in developing applications using Golang technologies including Goroutine, Channels,

Gokit, ORM GORM, Gorilla Mux, go - hystrix, godoc, ginkgo, GRPC, GoLand, GoCD - Experience using GIT, Maven, Jenkins, Sonar - Cloud Platform - Docker/Kubernetes/CI/CD/AWS or any other decent knowledge - Good Exposure on Design Patterns, API Gateways, Config servers Languages: English (Overall - 3 - Advanced)

QA Automation Engineer, CPaaS QA Section - QA Office

Department (RS Internet Services Div) Job Description: About Organization: Department Overview Within Rakuten Symphony, the Quality Assurance Office department is working as a central

organization inside the Internet Service Business Unit (ISBU) with the different product development team to secure CPaaS, Rakuten Maritime, NEO, Send Anywhere and Rakuten Drive applications and services meet our Customer's needs, expectations, and managing any Quality risks.

We are looking for a young, motivated, and talented QA Engineer to join Rakuten CPaaS (Communication Platform as a Service) team. CPaaS is a cloud-based solution that enhances business communication channels through a variety of flexible and easily customizable features. It enables companies to build stronger customer engagement and streamline their communication strategies.

Why We Hire We execute our QA mission through the ・Execution and monitoring of the development cycle and product deliveries. ・Pursuing process efficiency from standardization, systematic improvements and increased automation. ・Promoting constantly the Customer Focus mindset. ・Leveraging AI technologies to enhance testing strategies, automation, identify defects earlier, and drive data-informed quality improvements.

Position Details 【Job Duties】 ・Design comprehensive test cases ensuring robust product validation ・Develop and maintain both manual and automated test suites across various features ・Collaborate closely with developers and cross-functional teams to align on testing strategies, priorities, and quality standards ・Monitor, manage, and optimize automated test pipelines for efficiency and reliability ・Investigate issues, analyze functional specifications in detail, and recommend improvements to enhance the overall customer experience ・Perform effective debugging and issue analysis through detailed log review and investigation.

・Demonstrate a strong desire to continuously improve technical skills in both frontend and backend test automation.

【Tech Stack】 ・Kotlin/Java ・Maven ・Python ・Git

Work Environment Rakuten CPaaS Section is composed of members located in Tokyo, UK, and India.

You will be place in the Tokyo office and you will work with people from different countries & cultures.

Minimum Qualifications: ・Bachelor’s degree in Computer Science, Software Engineering or similar field ・At least 3 years work experience as QA engineer with both manual and automation expertise ・Expertise in one or more programming languages, preferably Java or Kotlin programming language ・Experience in Web automation using Selenium ・Experience in API automation using any frameworks ・Experience in pipeline creation, good understanding of CI/CD process and tools like Argo, Jenkins, CircleCI etc. ・Experience in using VCS like GitHub, GitLab, or Bitbucket ・English proficiency (written and verbal communication)

Preferred Qualifications: ・Experience in performance testing. ・Experience in Kubernetes. ・Exposure to Python language.

Others: Additional information on Location RCH in Tokyo Languages: English (Overall - 3 - Advanced)

LY - Backend Engineer (SeniorStaff) - LINE Messaging

Platform

Position Outline

We are looking for an experienced Backend Software Engineer to join the team behind

LINE's Messaging Platform. This role involves designing, implementing, and evolving critical

backend systems that enable global real-time communication at scale. You will play a

technical leading role in ensuring high reliability, performance, and security, while

contributing to system architecture and engineering excellence across teams to ensure

seamless communication for hundreds of millions globally.

As a senior contributor to the Messaging Platform team, you will be responsible for

designing, delivering, and operating highly scalable and reliable backend services that handle

tens of billions of messages per day across the LINE ecosystem. Your work will include

long-term architectural initiatives, cross-functional collaboration, and continuous

improvement of our services scalability and maintainability.

You'll provide technical leadership in developing new features and improving existing

systems, with a strong emphasis on system optimization, fault tolerance, observability, and

CI/CD automation. You will also mentor other engineers, shape team standards, and help

define platform strategy that anticipates future business needs.

Organization's Mission and Goals

• Deliver a secure, high-performance, and scalable backend messaging platform that

serves as critical infrastructure for global communication.

• Evolve the architecture through continuous technical innovation to support

increasing user scale, new features, and diverse messaging use cases.

• Enhance system reliability, maintainability, and observability through thoughtful

design, robust data structures, and long-term platform vision.

Responsibilities

• Lead the design and implementation of scalable backend features and APIs for

LINE's messaging platform.

• Architect distributed systems with a focus on scalability, fault tolerance, and

adaptability to evolving platform demands.

• Drive collaboration across organizational boundaries, aligning with Product, SRE,

Security, and other Platform teams to enhance system reliability, observability, and

user experience while ensuring efficient delivery meeting business needs.

• Drive enhancements to test automation, monitoring, and incident response

practices.

• Shape the long-term technical vision, decision-making, and roadmap for evolving our

backend architecture to meet future demands, aligning with organizational goals

• Mentor engineers and foster a culture of learning, quality, and continuous

improvement.

• Help establish and evolve engineering best practices and technical standards.

• Stay informed on industry trends to inspire innovation and maintain technical

excellence.

• Depending on the team and specific components, this role may include on-call

responsibilities to support our 24/365 service availability.

*Scope of Change: There is a possibility of reassignment to any duties as determined by the

company.

Learn About the Product

• LINE

o This is a communication app that allows you to seamlessly connect with

people, information, services, companies and brands, including talk, voice

calls, and video calls where you can enjoy conversation.

• LYP Premium

o This is a monthly membership service that allows you to use services and

benefits exclusively for LYP Premium members designated by LY

Corporation.

• Related services

Learn About the Organization and People

LINE Platform Server Function 開発チーム参考情報一覧

Our team is composed of talented engineers from diverse countries and backgrounds. We

foster a culture of curiosity, learning, innovation, mutual trust and proactivity that empowers

us to deliver at scale and adapt quickly to change.

Ideal Candidate

• Passionate about the challenges of building complex, large-scale distributed

systems.

• Strong analytical and logical thinking skills, with a high sense of responsibility,

curiosity, and passion for learning. Demonstrates critical thinking and takes initiative

in addressing complex challenges proactively.

• Team player with good collaboration skills that communicates effectively across

teams and levels, adapting style for diverse audiences.

• Is proactive in identifying technical challenges and leading initiatives to address

them.

• Supports team success through mentoring, knowledge sharing, and fostering a

collaborative engineering culture.

• Strikes a balance between technical ambition and practical execution, always

aligning with the team's constraints and goals.

Required Skills ＆ Experience

• Demonstrated experience in architecting or significantly contributing to distributed

systems in high-traffic environments.

• Strong proficiency in developing and maintaining large-scale backend services using

Java, Kotlin, Scala or similar.

• Experience leading mid-to-high complexity and impactful projects coordinating with

stakeholders to meet the business needs.

• Proven track record of providing strong technical leadership by shaping architecture

and driving standards across teams.

• Proficiency in system monitoring, incident management, and reliability practices.

• Demonstrated self-drive and ability to deliver timely results.

• Effective team player with a strong track record of collaboration and successful

project delivery in cross-functional environments.

• Demonstrated ability to mentor engineers and improve team-wide development

practices.

• Fluent in written and spoken English (or Japanese) for technical and cross-

functional communication.

Preferred Skills ＆ Experience

• Experience with distributed data storages such as Redis, MongoDB, Apache HBase,

Apache Kafka.

• Proficient with SRE practices, including defining and monitoring SLIs/SLOs.

• Knowledge in Security Engineering for backend systems. Awareness of and

adherence to modern security best practices in software development.

• Proficient with test engineering for highly concurrent systems.

• Solid understanding of CI/CD pipelines, testing strategies, and software deployment

best practices.

• Hands-on experience with observability tools such as Prometheus, Grafana,

Elasticsearch, and Kibana.

• Experience with Kubernetes and container orchestration in production environments.

Development Environment

• Product & Service Development: Java, Kotlin, Scala, Spring Framework.

• Observability: Prometheus, Grafana, AlertManager, Elasticsearch, Kibana, Zipkin.

• Storage (RDBMS, NoSQL, Event Store): Redis, Apache HBase, Apache Kafka,

MongoDB.

• Infrastructure: Container (Kubernetes), private cloud (Flava/Verda).