Senior Site Reliability Engineer, Search Platform - Search Department (SED)

Job Description: About Rakuten Rakuten Group, Inc. is the largest e-Commerce company in Japan, and provides a variety of services in e-commerce, fintech, digital content and communications to many users all over the world.

Department overview The Rakuten Technology Service Division, creates powerful, customer-focused search, recommendation, data science, advertising, marketing, price, and inventory optimization solutions to a variety of businesses in commerce, fintech and mobile industries. We design, develop, and deploy high performance, fault-tolerant distributed systems used by millions of Rakuten customers every day. We strive to deliver the most innovative solutions that are helpful to people and societies around the world.

Why we hire We are looking for a talented site reliability engineer to work in a cross functional team environment to deliver search services on our platform. The services you will administer support some of the largest e-commerce sites in Japan and across the world. To do so, you will be a key contributor to improving our processes, practices and tools as well as our infrastructure, software delivery and operations.

Position Details ● Configuration, tuning and deployment of our search platform, as well as search services on it,

operate search platforms safely to deliver the solution to our clients. ● Tailor and tune search services according to its users' requirements. ● Trouble shooting and investigating issues on the search platform. ● Continuously improve the operational workflow through automation. ● Continuously monitor and maintain our services within their SLAs. ● Act as a critical part of a multi-team effort to deliver, manage and maintain configuration

automation to meet user requirements. ● Document, design various processes geared toward continuously improving our services.

Requirements ● Minimum 5 years' experience with Linux/Unix systems. ● Good knowledge of system monitoring practice and tools. ● Experience in at least one container orchestration solution, e.g., K8s, Mesos etc. ● Good knowledge of CI/CD fundamentals (preferably in Jenkins) ● Master at least one scripting language, e.g., python, bash, etc. ● Good understanding of networking. ● Experience with data processing frameworks (e.g., Hadoop, Spark, etc.) is a plus. ● Responsible and self-motivated.

Java Software Engineer, Shipping Calculation Platform Group - EC Logistics Development Department (ECLD)

Job Description: Business Overview When you see the word "Rakuten", you probably have an image of many e-commerce-related services such as "Rakuten Ichiba", "Rakuten Books", and "Rakuten Fashion". If you order items from these services, it is commonplace every day that the items will be delivered to your home. So, where and how are these items managed, how are they boxed, shipped, and delivered to your home? In fact, these parts that you cannot directly see are the scope of responsibility of EC logistics, which we are in charge of. Department Overview We operate a number of warehouses in Japan where we store and manage Rakuten Books, Rakuten Fashion and Rakuten Direct items, and perform tasks such as receiving and shipping. In addition, we have developed a service called "Rakuten Super Logistics" and receive items from merchants in Rakuten Ichiba, and we also do item-related work on behalf of them. What is necessary for the series of operations in this warehouse is the system developed by the EC Logistics Development Department. If our system stops, items purchased through e-commerce will not be delivered, and the only direct contact with customers is "logistics (delivery)". Logistics has a strong impression of being behind the scenes, but it plays such an important role. In addition, while managing these systems close to the "site (warehouse)", the control of the "estimated delivery date" displayed on Rakuten Ichiba, the "delivery status display" from the purchase history on Rakuten Ichiba, and the "delivery related notification" are also part of the system that our department is in charge of. In this way, we, the EC Logistics Development Department, develop and operate the "logistics" that support the Rakuten Group and the "systems" that support it in general. ECLD's Mission: 1. To realize a service that allows shoppers to get "what you want" "when you want it" and "where you want it" by utilizing logistics and IT. 2. To provide convenient logistics services and functions to shoppers so that they can enjoy shopping. 3. To support the operation of Rakuten Ichiba merchants from a logistics perspective and contribute to maximizing sales. 4. Contribute to the development of Rakuten Ichiba by expanding the above logistics system. We're seeking a passionate and experienced Java Software Engineer to join our team. In this role, you'll be instrumental in building and enhancing high-performance, scalable backend systems that power our customer-centric services. You'll contribute to a culture of innovation, quality, and

customer focus, working on challenging problems involving high traffic and massive data volumes. If you thrive in a collaborative environment and enjoy taking ownership of your work, we encourage you to apply. Position: Why We Hire We're expanding our team to meet the growing demands of our innovative projects and to further strengthen our commitment to delivering exceptional solutions to our customers. Position Details - Design, develop, and maintain new features and services to enhance customer value. - Collaborate with platform and framework teams to improve overall engineering productivity. - Develop a strong sense of ownership for the systems you build, ensuring their reliability and performance. - Contribute to a culture of innovation, quality, and exceptional service. Mandatory Qualifications: - 6+ years of professional experience in Java development. - Solid understanding and practical experience with Java and reactive programming principles. - Proficiency with source control systems, particularly Git. - Experience with popular Java frameworks such as Spring and other micro-frameworks. - Experience with both Relational and NoSQL databases. - Experience developing and deploying reactive applications (e.g. Reactor or RxJava). - Experience with cloud-based and containerized application development. Desired Qualifications: - Experience working in an Agile team (e.g., Scrum). - Hands-on experience with containerization technologies and cloud platforms (e.g., Kubernetes, AWS, GCP, Azure). - Strong understanding of software development lifecycle best practices, including coding standards, code reviews, source code management, CI/CD, testing, and operations. - Familiarity with CI/CD and DevOps tools. - Experience with application performance monitoring tools and performance tuning techniques. - Experience with gRPC and REST API. - Experience with messaging systems such as Kafka, RabbitMQ. - Experience with message-driven architectures. Other Information: Additional information on Location Rakuten Crimson House (Head office) Additional information on English Qualification Proficient in English

Senior Software Engineer - Ad Product Section, Global Ad Technology Supervisory Department (GATD)

Job Description: Business Overview Rakuten is one of the leading e-commerce companies in the world. Our mission is to empower people and society through the internet while aiming at becoming the Global Innovation Company. Department Overview The advertising business is one of four focus areas of Rakuten. Our mission is to increase profit for all Rakuten, by providing high quality marketing services, as a CoE of Ad technology and Ad platform provider. We are always developing and enhancing comprehensive ad platforms, which enables our clients to fully utilize Rakuten's assets as much as possible. We have a highly motivated, skilled, talented, and approachable team distributed across Tokyo, Singapore, India, and China. Position: Why We Hire We are seeking a highly skilled and dynamic full-stack engineer with extensive technical expertise and proven team leadership experience to take ownership of technical responsibilities throughout the entire product development lifecycle. The ideal candidate will excel at solving diverse technical and business challenges while providing mentorship and guidance to other engineers on the team. This role provides an exciting opportunity to advance your tech career by contributing to the development of multiple products within Rakuten's extensive ecosystem and cutting-edge technology landscape. Position Details Project Execution - Gather and analyze requirements to ensure a clear understanding of project needs - Translate business requirements into detailed technical specifications - Design and implement scalable and efficient features - Perform unit testing, verification, and validation to ensure robust functionality - Conduct thorough code reviews to maintain high code quality and adherence to standards - Manage deployment and rollback operations across DEV, STG, and PROD environments - Monitor systems post-release, perform regular maintenance, and address any issues proactively Collaboration - Work closely with engineers, product managers, project managers, and cross-functional business teams to design and develop exceptional features - Collaborate with a separate QA team and DevOps team - Collaborate with cross-culture, cross-border development team during the project execution Always Improve, Always Advance - Develop a deep understanding of the entire product and system to identify and recommend technical enhancements

- Anticipate future business and product requirements, proactively suggesting system improvements to stay ahead of evolving needs - Stay ahead of the curve by exploring emerging technologies, evaluating their potential, and creating roadmaps to integrate them effectively Mentoring - Mentor junior developers, freshers, and interns, providing guidance and support to help them excel - Identify key areas for their growth and actively work towards fostering their technical development and career progression Mandatory Qualifications: - A minimum of 7+ years of proven, hands-on experience as a Software Engineer in software development, demonstrating strong analytical and problem-solving skills - Extensive hands-on experience in designing and developing large-scale web applications using technologies such as Java, Spring, MariaDB, MongoDB, Kafka, and React.js - Comprehensive, hands-on experience with Agile development methodologies and Scrum practices - Proactive, self-driven, and highly motivated individual - Excellent communication skills, capable of effectively collaborating with both technical and non-technical stakeholders - A team player with a positive and approachable attitude - Strong "get-things-done" mindset paired with a sense of ownership and accountability Technical - Java spring (boot+batch) - HTML, CSS, JavaScript - MySQL/MariaDB - NoSQL (MongoDB) - Big Data (Hadoop, Hive, Spark) - Version Control - Git - Jira or similar project and task management tool Desired Qualifications: - React, Angular - NoSQL (Couchbase, Cassandra, Redis) - Big Data (Tez, Presto) - Test Automation - JUnit - Code Quality - Sonar - Streaming platform - Kafka, RabitMQ - CI/CD - Jenkins - BI Tool - MicroStrategy, Tableau - Experience with enterprise system architecture design such as data pipeline design - Domain knowledge of advertisement system architecture and KPIs Languages: English (Overall - 3 - Advanced)

Native Mobile Engineer, iOS/Android - Kobo Japan

Technology Department (KJT) Job Description: Department Overview At Rakuten Kobo, we are passionate about transforming the way the world reads. Our team develops innovative eReading devices, apps, and services that connect millions of book lovers to stories and knowledge. We foster a collaborative, diverse, and dynamic environment where creativity and technology come together to deliver exceptional experiences for our customers. 　 Position: Why We Hire We are looking for more members to improve/enhance our products. 　 Position Details We are seeking a highly motivated and experienced Native Mobile Engineer to join our Kobo Japan Apps Group. You will play a key role in developing and enhancing our iOS and/or Android applications, ensuring a smooth, engaging, and culturally relevant reading experience for our Japanese users. A strong understanding of mobile development best practices, experience with Japanese content rendering, and a passion for delivering exceptional user experiences are essential for this role. 　 Work Environment The Kobo Japan apps team offers a collaborative, multicultural work environment focused on innovation, quality, and agile development. All communication is conducted in English, with open knowledge sharing and support for continuous improvement. Flexible work arrangements, modern tools, and professional growth opportunities are provided. The team values diversity, mutual respect, and a healthy work-life balance while delivering user-friendly digital reading experiences. Desired Personality - Collaborative: Enjoys working in a team, values open communication, and actively shares knowledge with colleagues. - User-Centric: Passionate about delivering the best reading experience for Japanese users, attentive to local needs and feedback. - Adaptable: Comfortable with change, eager to learn new technologies, and able to adjust to evolving requirements or priorities. - Quality-Focused: Pays attention to detail, takes pride in writing clean, maintainable code, and is committed to delivering high-quality, bug-free apps.

- Proactive: Takes initiative to identify and solve problems, suggests improvements, and is not afraid to ask questions or challenge the status quo. - Culturally Sensitive: Appreciates and respects Japanese culture and working styles, and is open to diverse perspectives. - Growth-Oriented: Seeks opportunities for personal and professional development, welcomes feedback, and strives for continuous improvement. - Customer-First Mindset: Thinks from the end-user’s perspective, prioritizes usability and accessibility, and is motivated by customer satisfaction. Mandatory Qualifications: - Bachelor's degree in Computer Science or a related field, or equivalent experience. - 5+ years of experience in native iOS (Swift/Objective-C) and/or Android (Kotlin/Java) mobile application development. - Strong understanding of mobile development principles, design patterns, and best practices. - Experience with common mobile architectures (MVVM, MVP, etc.). - Experience with RESTful APIs and JSON data. - Experience with version control systems (e.g., Git). - Experience with automated testing frameworks (e.g., Appium, Espresso, XCUITest). - Experience with scripting languages for automation (e.g., Python, JavaScript). - Excellent problem-solving and debugging skills. - Strong communication and collaboration skills. - As a mobile engineer in the team, you can focus on only either iOS or Android, but you are expected to support the other platform when needed. 　 Desired Qualifications: - Experience with Japanese content rendering, including handling complex Japanese typography, vertical text, and ruby characters (furigana). - Familiarity with Japanese language and culture. - Experience with e-commerce or subscription-based applications. - Experience with CI/CD pipelines. - Experience with performance monitoring and profiling tools. - Contributions to open-source projects. - Experience with Jetpack Compose or SwiftUI. 　 Other Information: Additional information on Location Rakuten Crimson House (Head office) Languages: English (Overall - 4 - Fluent)