Engineering Jobs in Japan

EN: BusinessJP: Not Required

BTP Engineer - Business Support Development Department (BSD)

Our team is responsible for internal business support systems for our e-commerce platform, analytics systems for merchant sales, performance estimation systems for new strategies, and accounting management systems and billing data in both domestic and overseas markets. In the future, we will execute a project to migrate our current SAP ECC6.0 to SAP S/4HANA by the end of 2027. After the service goes live, we aim to achieve maintenance and operations through in-house resources. Therefore, we would like you to join from the development phase on the project to understand the specifications of the new system. We are seeking highly skilled Application Engineers with expertise in Java development and SAP Business Technology Platform (BTP) to build and integrate application platforms for internal business use. You will understand business requirements and translate them into new, effective, and operational IT plans. You will be responsible for developing, enhancing, and maintaining internal business applications, with a focus on leveraging cloud-native technologies and integration platforms. Responsibilities include developing and deploying applications on SAP Business Technology Platform (BTP), utilizing its various services and capabilities; collaborating with other developers, architects, and stakeholders to ensure the successful delivery of projects; participating in all phases of the software development lifecycle, including requirements gathering, design, development, testing, and deployment; implementing and maintaining CI/CD pipelines for automated build, test, and deployment processes; troubleshooting and resolving technical issues related to application performance, scalability, and security; staying up-to-date with the latest trends and technologies in Java development, cloud computing, and integration platforms; and contributing to the development of best practices and standards for application development and integration.

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Information Security GRC Specialist - Information Security Management Office, Information Security & Privacy Governance Department (ISPD)

The Information Security & Privacy Governance Department is a part of the Technology Management Division, which is a common technical division within the Rakuten Group. The Information Security Management Office oversees information security governance within the Rakuten Group, formulates regulations related to information security governance, supports implementation in development and business departments, monitors, and provides employee education/awareness. The Information Security Policy Group is a team under the Group CISO (Chief Information Security Officer) responsible for formulating regulations for the Rakuten Group. The Information Security Specialist in this group is responsible for planning and drafting security policy, formulation strategies, creating specific policies, and managing the formalization process. In the process of policy formulation, the role also involves prior coordination with relevant departments and group companies, as well as providing explanations and guidance to ensure the formalized policies are effectively implemented. This is a critical position at the core of the Group's information security governance, where various security requirements are materialized while considering global standards, industry norms, and technical feasibility. Formulation and maintenance of Rakuten Group regulations, as well as Rakuten Group, Inc.'s Information Security Policy and related policies, including those for AI. Gathering requirements through regular communication with relevant departments and group companies, and executing and managing the formalization process. Acquiring information on industry trends and regulatory changes related to information security and sharing it with the CISO community. Preparing reports for the Rakuten Group CIO, CISO, and management meetings, as directed by the Head of the Information Security & Privacy Governance Department.

EN: BusinessJP: Native

SAP BTP Architect/Engineer - Corporate IT Service Department (CITSD)

Salesforce Engineer - Backoffice Business Support Section, Business Support Development Department (BSD)

Rakuten Group's mission is to "Empower people and society through innovation". Domestically and internationally, Rakuten provides a wide range of services, with e-commerce at its core. These services include internet services such as travel, digital content, and communications; FinTech (financial) services such as credit cards, banking, securities, insurance, and electronic money; and even professional sports. The Business Support Development Department (BSD) plays a crucial role in providing system support for various operations between users, clients, and Rakuten businesses. Our department provides diverse services across three main areas: DATA, Business Support/Accounting, and CRM. We strive to ensure the highest quality standards in system delivery and support while pursuing business process optimization and efficiency. Our team sets goals, monitors continuously, and evaluates for the quality at services in BSD. And deliver quality that exceeds user expectations through talent development and implementing improvement measures as needed. With business growth, we are receiving more and more requests from the business side. We are looking for a Salesforce Engineer who can lead our activities from requirement analysis, application design, development, and troubleshooting to enhance the Salesforce team's performance. In this position, you will be able to lead the expansion of Salesforce usage and cooperate with other development teams to make a good system integration. As a Senior Engineer, you will be in charge of developing, enhancing, and maintaining the applications and continuously improving the system as the business keeps updating and integrating with other internal systems. In the future, you will also be expected to take on people management responsibilities. Responsibilities include analyzing users' requirements and providing system solutions; designing, coding, and implementing Salesforce applications and related tools; testing the stability and functionality of the application; troubleshooting and fixing bugs; and maintaining the security and integrity of the application software.

EN: BusinessJP: Not Required

Senior Software Engineer, Advertisement Optimization Group - Merchandising and Advertisement Department (MAD)

Rakuten is a leading Japanese e-commerce and internet services company that offers a wide range of products and services to customers worldwide. With a strong focus on innovation, Rakuten aims to empower individuals, businesses, and society as a whole through its unique ecosystem of e-commerce, fintech, digital content, and communications services. The Merchandising and Advertisement Department leverages AI-driven advertisement optimization, and pricing and inventory optimization systems based on demand forecasting. By closely integrating the information obtained from merchandising into our advertisement strategies, we maximize the synergy between both functions. This enables us to efficiently deliver optimal offers and information to our customers, thereby contributing to increased sales and enhanced customer satisfaction. The Advertisement Optimization Group is a team of specialists in ad optimization, with AI at its core. We are responsible for the development and operation of highly effective ad optimization logic and platforms. Our mission is to maximize publishers' ad revenue while maintaining and improving advertisers' ROAS (Return On Ad Spend). Specifically, we continuously improve ad delivery optimization, bidding/budget allocation, personalization, and performance measurement, contributing to the realization of a world that enhances both advertisers' ROI (Return On Investment) and user experience. We are looking for a Senior Software Engineer to lead the design, development, and optimization of complex data processing pipelines and high throughput APIs. You will guide technical decisions, mentor engineers, and ensure that our platforms remain robust, scalable, and aligned with long-term business goals. This role is ideal for individuals who thrive in highly technical environments and enjoy solving challenging problems with modern engineering practices. Responsibilities include leading the design and architecture of large-scale, distributed software systems; developing high-quality, maintainable code across the full SDLC; collaborating with product, design, and engineering stakeholders to define technical requirements and project scope; driving engineering best practices including code reviews, testing strategies, standards, and documentation; mentoring and supporting junior/mid-level engineers through guidance, pairing, and knowledge sharing; identifying and resolving complex issues related to performance, scalability, and system reliability; contributing to long-term technical strategy, platform modernization, and technology roadmap planning; evaluating and integrating new tools, frameworks, and technologies to improve development efficiency; and leading technical initiatives, migration projects, or cross-team engineering efforts.

EN: BusinessJP: Not Required

Senior Backend Software Engineer, Booking Services Search Group - Search Department (SED)

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. Search Department focuses on Search, Discovery, and Navigation experience for users of Rakuten. 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. We are looking for a senior backend software engineer to work on core search system development. The role will build the state-of-the-art search systems, propelling the fast iteration of search development. Support fast iterations of Rakuten search business and further enable the product growth. Build a fast and robust Search product by keeping optimizing system performance and improving service stability. Construct a high freshness index and provide a reliable offline data support for Search Engine. Guarantee reasonable Search architecture governance to ensure that the overall system operates smoothly.

Web Application Engineer - EC First Party Development Department (ECFD)

Rakuten is an EC company that owns Japan's largest platform called Rakuten Ichiba. The business model of Rakuten Ichiba is BtoBtoC, and Client Stores, Society and Rakuten Group work together as a unity. We cooperate and enlarge on the Rakuten Ichiba Platform. Rakuten Group's EC First Party Development Department (ECFD) has several B-to-C businesses that will drive Rakuten business. The following services are currently operated by ECFD: Rakuten Fashion; Rakuten 24 and Rakuten 24 Express; Rakuten Mart and Rakuten Zenkoku Super; and Rakuten Bic. In the development of ECFD, we keep our eyes on the services along with the business, and we can propose, develop, and verify the effectiveness of the services by ourselves. You can acquire specialized and professional engineering skills related to e-commerce. In recent years, our services have grown significantly each year and we have a number of projects to improve and enhance our services, requiring additional application engineering leaders. Define and define requirements, design and manufacture (including external vendor management), and provide technical lead for projects in application development. As a technical lead, lead the design and development of applications in collaboration with PDM, internal members, and collaborating vendors. As a core member of the project, monitor system stability and performance, optimize performance, design and maintain system architectures, refactoring, optimization, and troubleshooting. This position provides the opportunity to gain extensive knowledge and experience in the development of back-end systems, including batch processing and APIs to handle core processes such as order management and inventory. The development organization of the EC First Party Development Department (ECFD) is divided by the services and products for which they are responsible, with a total of over 100 engineers. In addition to new graduates, there are many members from SIer and other business companies, and the team consists of a wide range of ages, from young people aiming for growth to mid-career members leading the business. We have people from various backgrounds, including foreign nationals, who are active in the company. This time, we are looking for a tech leader class who can lead web application development from the upstream process to the release. The technology stack includes Java/Spring, OracleDB, Redis, Git, Kubernetes/Docker, Jenkins, Gradle/Maven, Grafana/Prometheus, and Sentry.

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Salesforce CoE Team Lead - Business IT Platform Section, Corporate IT Service Department (CITSD)

The Technology Management Division (TMD) provides Corporate IT, and Cyber Security & Privacy Governance to Rakuten Group companies and essential business management for technology organizations, thereby enabling innovation and strengthening the foundation of technology. Within TMD, the Corporate IT Supervisory Department (CITD) drives Rakuten Group’s global corporate IT services and infrastructure. Our mission is to empower Rakuten through innovative and secure IT solutions that enhance efficiency and foster productivity. Corporate IT Service Department (CITSD) supports the Rakuten Group through innovative and secure IT solutions that improve efficiency and productivity. CITSD is responsible for enterprise application management for core business functions, driving business process automation and digital transformation through IT platforms, providing comprehensive end-user and operational support, and optimizing IT processes that underpin a wide range of critical services and platforms. In addition, CITSD incorporates AI technologies - such as generative AI and AI agents - to enhance support capabilities, including faster issue triage, improved knowledge discovery, and more efficient operations, helping business teams reduce workload while improving service quality. The Business IT Platform Section is responsible for planning and driving the enterprise IT platform that supports internal business operations. Our scope includes the standardization and deployment of cloud services, implementation of productivity-enhancing applications, data integration with core internal ERP systems, and a strong focus on the development and application of AI technologies. As a central part of the company’s IT strategy, we collaborate across departments to build a secure, stable, and user-friendly next-generation IT environment. Lead the Salesforce CoE team and shared platform operations as a Team Leader, owning the strategy and roadmap. Ensure secure, high-quality delivery, establish clear operating rhythms and governance, and drive adoption of Salesforce capabilities (Sales Cloud/Service Cloud), including AI-driven efficiency initiatives. Lead the Salesforce CoE’s day-to-day platform operations and continuous enhancements end-to-end; owning the operating model, roadmap execution, and release/change cadence; defining clear roles/responsibilities and governance; prioritizing and delivering enhancements while maintaining stability, security, and service quality; and driving adoption of Sales Cloud/Service Cloud, including AI-driven efficiency initiatives. Communicate progress, risks, and decisions to senior stakeholders; manage vendor performance and contract compliance; ensure delivery governance across multiple concurrent initiatives.

Externalengineeringother

Mechanical engineer - MA - AS Bussiness Unit

This position will be responsible for leading the product development activities of mechanical and/or electronic-mechanical service tools and equipment for automotive, commercial and ag/off-road vehicles. This position is fully accountable for designing and developing new products, redesigning existing products, overseeing the prototype delivery and testing of products that meet the schedule, costs, and performance specification of internal and external customers. Full responsibility for all engineering documentation, specifications, engineering quality, and required data for the assigned project or customer account. Develop a collaborative partnership with the customer to ensure that customer needs are anticipated and met; work closely and in partnership with the sales team. Conceptualize and design new products/tools to meet customer specifications in a timely manner utilizing the best of Engineering practices (GD&T, DFMEA, DFM, CAD, physical testing, finite element analysis, etc.). Conduct validation and verification activities including analysis (calculations and/or FEA), physical testing, design reviews, and FMEA’s on new tools to assure form, fit, function and safety. Support production through continuous product engineering, problem solving, and warranty reduction. Utilize standard measurement tools such as calipers, micrometers, height gage, thread pitch gages, etc. to perform initial sample inspection reports. Document designs and technical project data using accepted engineering documentation practices (drawings, BOM, test reports, design reviews, FMEA, etc). Lead product development projects, utilizing project management skills and best engineering practices to meet project objectives (cost, schedule, and technical objectives). Provide technical and quality support to suppliers and build strong relationships.

EN: BusinessJP: Native

Externalengineeringqa

QA Automation Engineer - BSS Product Management Department (BSPMD)

The Technology Platforms Division (TPD) drives the growth of the Rakuten Ecosystem by delivering innovative, high-quality technology platforms characterized by integrated control and strategic partnerships. Within TPD, the Telecom Business Application Supervisory Department (TBASD) develops and maintains a unified, high-quality Business Support System (BSS) for Rakuten Mobile. We deliver agile, scalable solutions across the customer lifecycle and continuously enhance system performance through close collaboration with stakeholders. The Business Support System Product Management Department (BSPMD) is responsible for providing a unified product strategy for the Business Support System (BSS) that integrates with the Rakuten ecosystem to maximize Rakuten Mobile's business potential. Our core missions are managing the product development lifecycle by focusing on project ROI, building a unified BSS platform, and enhancing our AI-driven platform capabilities. BSS QA Section is responsible for end-to-end quality assurance of Rakuten BSS systems. This position drives test automation for BSS B2C products in close collaboration with development teams, release management, and external partners. Design and implement automated test solutions across web, app, API. Build and maintain scalable test frameworks that support continuous testing. Collaborate with engineers and product teams to define quality requirements and acceptance criteria. Drive integration of automated tests into CI/CD pipelines to enable continuous quality feedback. Analyze test results, identify defects, and work with development teams to drive resolution. Contribute to improving overall software quality through proactive testing strategies and expanded coverage.