Engineering Jobs in Japan
131 engineering jobs in Japan open to English speakers, updated 25 October 2026.
Japan's tech scene is hiring international engineers. Browse frontend, backend, mobile, DevOps, data, and machine learning roles at companies that welcome English-speaking talent. Many offer remote work, visa sponsorship, and no Japanese requirement.
Refine with filters →Web UI/UX Engineer - Frontend System Development Department, Rakuten Payment, Inc. (Secondment)
RakutenJoin us in building the next generation of internet services that reach hundreds of millions of users across the globe. Rakuten Group, Inc. is on a mission to empower individuals and society through innovation and entrepreneurship. Today we have 70+ businesses in 29 countries across a range of sectors, with a key part of this being our presence in FinTech and Rakuten Payment, Inc. Our global solutions enable end-users and merchants to quickly and safely make and accept payments. Furthermore, we strive to delight our end-users by bringing them the full benefits of Rakuten membership in our Payment offerings, leveraging our famous Rakuten Points. Rakuten Payment, Inc. Frontend System Development Department oversees development for all Rakuten Payment services. Our vision is to build and shape payment technologies that support our users’ daily lives today and in the future. The Frontend System Development Department handles development for the Rakuten Pay mobile application, which serves as a gateway to all Rakuten Payment services and Rakuten’s FinTech ecosystem. Our mission, as a key driver of Rakuten Payment, Inc. services, is to attract and delight end-users with robust and convenient services. The department developers cover a wide range of user services, including service sites, campaigns, and advertisements, as well as critical mobile app functions. This is achieved through a hybrid mobile app approach. At the department, we are committed to maintaining and enhancing Rakuten shoppers’ experience by organizing autonomous cross-functional teams, able to take ownership of dedicated product areas within the shared app. Due to the growing responsibilities of our department, we are looking for a UI/UX Engineer to help drive forward our innovative products and solutions across Rakuten Group, Inc. and Rakuten Payment, Inc. Contribute to the development and growth of the Rakuten Pay mobile app. Collaborate with cross-functional team members to understand business objectives and technical details, incorporating them into design and delivering value from inception to service release. Lead development projects to proactively solve business challenges. Take ownership of dedicated product areas, committing to continuous improvement on product strategy and user experience. Foster a culture of knowledge sharing and continuous learning within the department and company.
Mechanical Engineer (Tech)
ArupWe are seeking a mechanical building services engineer to work on technology projects, primarily data centers, in Japan’s growing Technology Sector and across APAC. Reporting to the Japan Technology Sector Lead and as a member of the Technology Team, you will be responsible for mechanical building services design, engineering, and consulting. Working with engineers in Japan and across APAC, you will contribute to projects from early concept development through detailed design and construction support, building your expertise through data center projects. Depending on your experience and skills, you will lead assigned work packages while developing advanced technical capabilities and project management experience.
[PS-SC] Powertrain ECU Calibration Engineer
BoschCoordinate calibration projects for gasoline, diesel, HEV, and BEV electronic control systems. Responsibilities include base calibration (fundamental engine and vehicle performance), starting, drivability calibration (driving performance), emissions (exhaust gas performance), calibration of intake and exhaust control using model-based control, coordinated motor and engine control for HEVs, torque and thermal management control for EVs, fault diagnosis calibration, and management of the overall calibration schedule and progress.
Analog Senior or Staff Design Engineer
Micron TechnologyAs a Sr. Design Engineer / Staff Design Engineer in the NVE Design Engineering Analog Design Group at Micron Technology, Inc., you will contribute to the development of memory products that are best-in-class, using your specialized knowledge and Micron proprietary methods of designing and analyzing core and mixed circuits used in the development of memory products. Responsibilities include designing, simulating, optimizing, and floor-planning NAND circuit blocks; evaluating design feasibility and analyzing circuit functionality across use cases; implementing analog and mixed-signal circuit designs that meet performance and reliability specifications; and validating design performance at block- and chip-level using industry-standard simulation tools. You will continuously improve NAND die size, performance, power consumption, reliability, quality, cost, and time-to-market, including collaborating in a multi-functional, multi-time zone working environment. You will build and maintain Python-based AI utilities that collaborate with EDA tools to accelerate development workflows, such as environment setup, corner execution, regressions, automated documentation, and predictive build/layout. You will review existing user documentation and generate new build collateral. You will collaborate with groups such as Product Engineering, Test, Probe, Process Integration, Assembly, and Marketing to ensure optimized manufacturability, cost, reliability, and time-to-market. The ideal candidate is first and foremost a strong analog and mixed-signal designer who can independently solve complex circuit problems. In addition, the candidate is curious about AI, comfortable writing code, and motivated to convert engineering pain points into practical agent-based flows. The candidate should balance experimentation with disciplined validation, ensuring that AI augments engineering judgment rather than replacing technical review.
Senior Data Scientist, Credit Modeling
PaypayAs a Senior Data Scientist in PayPay Credit Modeling, you will lead work that improves credit risk and financial decisions. You will lead modeling initiatives from identifying opportunities and framing ambiguous business problems through developing models, designing credible evaluations, and assessing real-world impact. You will collaborate closely with product, risk, data engineering, and machine learning engineering teams to translate research into reliable, scalable solutions. This is a role with scope to shape the technical direction of modeling and analysis, coach colleagues, and influence decisions across PayPay. Responsibilities include owning the scientific approach to modeling work, from defining the decision and expected value through baselines, validation, and a clear recommendation; developing and evaluating models and features using large, varied datasets and choosing methods that fit the problem and can be explained, validated, and maintained; setting evaluation standards for how models will be used, challenging assumptions, detecting leakage and selection bias, accounting for delayed outcomes, and using appropriate baselines, time-aware tests, and calibration to judge whether results are reliable; estimating likely effects on revenue, credit losses, exposure, portfolio quality, and customer outcomes, and making assumptions and uncertainty clear; guiding promising models through production with data and machine learning engineers, defining model and feature requirements, validating deployed behavior, monitoring performance and outcomes, and recommending changes based on evidence; communicating findings and trade-offs to technical and non-technical stakeholders and helping teams decide whether to proceed, change course, or stop; and leading technical discussions, critically reviewing modeling approaches, mentoring other data scientists, and establishing reusable practices that improve the team's work. Ways of working include taking ownership of ambiguous questions and bringing structure to the work needed to answer them; challenging assumptions constructively and revising your view when the evidence changes; balancing speed with rigor, explainability, and the ability to maintain what you build; and communicating trade-offs and decisions clearly to partners with different expertise and priorities.
Machine Learning Engineer (Deep Learning), Credit ML - Merpay
MercariMerpay Credit Modeling team's mission is to "create a credit business that delivers value to everyone using high-quality data science and machine learning technology." Under this mission, we handle everything from identifying business challenges to model construction, development, and operations. Currently, the team is working on developing a next-generation credit modeling platform using deep learning. Leveraging diverse data from the Mercari ecosystem, we aim to build versatile foundation models that can be applied to multiple tasks across credit and other domains. In this position, as a core member responsible for the large-scale deep learning models at the heart of our next-generation credit system, you will play a central role in everything from evaluating model architectures and training strategies to production deployment and continuous improvement. Design, develop, and improve core large-scale deep learning models for next-generation credit modeling, including model architecture design based on the challenges and data characteristics of the credit domain; training task and objective-function design and scaling policies considering data, model architecture, and compute budgets; GPU-based large-scale and distributed training infrastructure; and evaluation encompassing offline metrics, business KPIs, risk metrics, stability, fairness, and explainability. Deploy and operate large-scale deep learning models in production by designing training and inference pipelines, optimizing inference efficiency, integrating models into production systems, and designing monitoring, retraining, rollback, and MLOps practices. Make technical decisions about modeling policies and trade-offs such as model scale and performance versus cost, inference latency, interpretability, and coexistence with legacy models. Keep up with the latest research trends and evaluate their application to in-house challenges. Operate and continuously improve existing credit models. Lead consensus-building and collaboration with stakeholders in product, business, legal, and compliance. Provide technical mentorship in deep learning to team members and systematize knowledge. This role offers the opportunity to build next-generation financial deep learning models from scratch using Mercari's massive and diverse dataset, apply state-of-the-art deep learning and large-scale training to credit scoring and risk evaluation, deliver high-stakes production systems balancing accuracy, stability, explainability, and operational quality, and contribute to financial inclusion. The project is in an active development phase, offering significant autonomy in model architecture and training strategy decisions, with opportunities to grow into project leadership.
Data Engineer - BI Insights Group, Data Platform Department (DPD)
RakutenThe Data Platform Department (DPD) at Rakuten Group develops and maintains a comprehensive data platform, empowering over 70 Rakuten services with solutions for data ingestion, discovery, governance, analytics, and querying. We support data-driven decision-making across one of Japan's largest data ecosystems, providing the tools and infrastructure to support key domains such as Data Lakes, Data Warehouses, and Business Intelligence. The role involves hands-on design, development, testing, and implementation of scalable, cloud-based data warehouse solutions, optimized data pipelines, and robust data modeling. Maintain a healthy data warehouse ecosystem through comprehensive infrastructure management, including system logs, storage, compute resources, and batch scheduling, ensuring seamless data integration and proactively addressing performance bottlenecks. Adapt to and utilize Rakuten’s internal data pipeline orchestration framework, built on top of GCP-managed Airflow. Collaborate with cross-functional teams to identify data requirements and align them with business objectives. Maintain comprehensive documentation, including platform architecture, data dictionaries, infrastructure configurations, and operational processes. Work closely with end-users to understand requirements, gather feedback, and deliver impactful, customized reports. Propose and present visualization solutions to relevant stakeholders. Architect reporting-specific data marts to ensure high-performance dashboards. Develop, maintain, and optimize pipelines, including DAG scheduling, data ingestion, and ETL/ELT processes, to ensure data is collected and delivered efficiently and reliably. Validate and ensure the accuracy, consistency, and reliability of all data used in visualizations. Design, build, and manage interactive reports using modern data visualization tools.
Applications Development Programmer Analyst, Assistant Vice President
CitibankThis Senior Developer role for Pricing and Correlation is within a global application development team responsible for Real Time Pricing applications for our Credit trading business. The role will focus on design and implementation of critical new features as well as architectural and performance improvements. This role requires strong design and programming skills in Java, knowledge of various streaming frameworks as well as familiarity with challenges that arise when implementing real time performant systems. Experience in Front Office technology, knowledge on Fixed Income Credit products, UI development technical skills considered a plus. This position is aligned with Japan standard working hours (with overlap into London start-of-day). While the role is part of a global team collaborating across APAC, EMEA, and North America, your primary operational focus will be working together with the Tokyo team to support local Japan/APAC business hours and facilitate seamless coverage into the London start-of-day window. In this role, you’re expected to collaborate with the team to understand functional and operational requirements; design and implement robust and testable code in support of the requirements; develop certain non-functional features in the system to improve reliability, scalability and performance; contribute to the design and implementation of automated test suites; participate in code reviews helping other team members improve their code; partner with multiple management teams to ensure appropriate integration of functions to meet goals as well as identify and define necessary system enhancements to deploy new products and process improvements; resolve variety of high impact problems/projects through in-depth evaluation of business processes, system processes, and industry standards; provide expertise in area and advanced knowledge of applications programming and ensure application design adheres to the overall architecture blueprint; utilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation; develop comprehensive knowledge of how areas of business, such as architecture and infrastructure, integrate to accomplish business goals; provide in-depth analysis with interpretive thinking to define issues and develop innovative solutions; and appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency. Key relationships include the Derivative Pricing & eTrading team in Tokyo, New York, Poland, Canada; other development teams in the same regions; the Credit Trading Desk; and the application support organization.
Development Director (Frontend development direction) - Platform Strategy Supervisory Department (PFSD)
RakutenRakuten Group is headquartered in Japan and serves approximately 100 million domestic customers and 2 billion customers across 30 countries worldwide. We provide more than 70 services across various fields including e-commerce, payment services, financial services, telecommunications, media, and sports. Rakuten has expanded its business scale with core businesses such as the online shopping mall service Rakuten Ichiba and the credit card business Rakuten Card, achieving consolidated revenue of 2.2 trillion yen and domestic gross transaction value of 6.0 trillion yen. Looking ahead, Rakuten aims to create a new business model that establishes a stronger Rakuten Ecosystem, including offline aspects of daily life, by fully leveraging assets cultivated primarily through online services, such as Rakuten membership, Rakuten Points, brand strength, and member data. This position is part of the Platform Strategy Supervisory Department, which belongs to a corporate organization directly under the COO and Vice President. Rather than operating a specific service, this department is responsible for driving ecosystem growth strategies and initiatives centered on cross-group marketing across the Rakuten Group. As the only division within Rakuten Group that executes initiatives based on company-wide strategy, it offers a unique opportunity to build a broad perspective while being involved in both strategic planning and execution. The work of the Platform Strategy Supervisory Department is broad and diverse, ranging from proposals to top management on company-wide strategies, to planning concrete initiatives based on those strategies, creating innovative and attractive programs and products, and designing operations that enable customers to use our services with confidence. We are looking for a Development Director to join our product development team, primarily working on Rakuten PointClub and Rakuten’s coupon-related products. This role will lead development direction with a strong focus on frontend implementation, while maintaining a broader view of the entire implementation landscape, including backend systems. The key responsibility is to connect business and product requirements with engineering and ensure that all necessary components are brought together to deliver a successful implementation. As the boundaries between frontend and backend development continue to become less distinct, we are not simply looking for someone who manages frontend schedules and tasks. We are looking for someone who starts from a strong understanding of frontend development, but is also capable of understanding the broader technical architecture, system dependencies, APIs, and engineering constraints. This person should work closely with engineers and take ownership of connecting all the pieces without gaps throughout the implementation process. Our development teams communicate primarily in English. Therefore, the ability to accurately understand complex technical discussions and communicate them clearly to relevant stakeholders is essential. However, this is not an interpreter role. We expect the Development Director to understand the technology behind the discussion, evaluate possible solutions, negotiate and discuss options directly with engineers, propose alternatives, and ultimately direct the team toward the most appropriate solution. For this reason, professional-level communication skills in both Japanese and English, including the ability to participate in technical discussions on equal footing, are required. Rakuten provides a wide range of technologies, platforms, and internal solutions. Our teams actively integrate APIs provided by other organizations and continuously explore new technologies to improve our products. Introducing new technologies and integrating different systems often involves technical constraints and unexpected challenges. We are looking for someone who can work persistently with engineers and related teams to identify the best solution and drive implementation through to a safe, reliable, and successful release. Our development organization also works very closely with product planning and marketing teams. It is therefore important to understand not only what needs to be implemented, but also why—the business objectives and intentions behind each requirement. Rather than approaching projects as “Business vs. Development,” we expect this person to work as one member of the same business and product organization, collaborating toward shared goals. There are also many opportunities to collaborate with product planners and UX directors from the early stages of product development. Candidates who are interested in UX and can consider both the technical implementation and the overall user experience will have opportunities to contribute across an even broader range of areas. We are looking for a director who understands technology and can connect product planning, UX, frontend, and backend development—turning complex requirements into reliable, real-world implementations. Starting from a frontend perspective, you will have opportunities to work across a broad range of areas, including backend technologies, product planning, and UX. You will work closely with central Rakuten products such as Rakuten PointClub and Rakuten’s coupon services, which connect with a wide range of services across the Rakuten ecosystem. This gives you the opportunity to see the impact of your work across a large-scale user base. Rather than simply maintaining existing systems, you will have opportunities to continuously evolve our products by integrating various APIs, technologies, and solutions available across Rakuten Group. As a Development Director leading implementation, you will be involved throughout the entire development lifecycle—from requirement definition and technical discussions to implementation, testing, and release—and take ownership of delivering products to users. This is not simply a project coordination role. You will understand technical backgrounds and constraints, discuss solutions directly with engineers, propose alternatives, and help guide the team toward the most appropriate implementation. You will act as a key bridge between engineering and product planning, marketing, and UX teams, giving you the opportunity to influence products from both business and technology perspectives. You will work in a bilingual Japanese-English environment and gain hands-on experience collaborating and discussing technical solutions with global engineering teams. You will develop practical skills in frontend-focused implementation direction, API and backend understanding, technical negotiation, problem solving, and development leadership in a bilingual environment. By participating across the entire product development lifecycle—from upstream product planning and UX through technical design, implementation, QA, and release—you can develop into a well-rounded Development Director with expertise beyond a single technical domain. Through hands-on experience with Rakuten’s diverse technology platforms, APIs, and emerging solutions, you will build a broad technical perspective that extends beyond frontend development alone. Over time, you can expand your responsibilities toward leading larger-scale products and multiple development initiatives as a Development Director or product development leader. The listed position details describe leading UX direction for products and services related to the Rakuten Ecosystem; planning experience design and initiatives based on business and service strategy; organizing user issues and business requirements and translating them into product requirements; defining specifications including screen design, information architecture, transition design, and interaction design; leading development direction and project management in close collaboration with engineers; supporting decision-making and prioritization within sprint and development processes; driving projects as a hub across design, engineering, and business teams; reviewing implementations and ensuring quality from both UX and specification perspectives; leading end-to-end execution and issue resolution toward product release; and identifying issues and planning and executing improvement initiatives based on user research and data analysis. The expected assignment is the Platform Strategy Supervisory Department - Customer Strategy Department - Experience Section. The Platform Strategy Supervisory Department has approximately 60 members, a balanced gender ratio, and an average age in the mid-30s. Many members joined mid-career, and the division welcomes diverse backgrounds such as consulting, IT, platform companies, venture companies, telecommunications, and content operations. The Experience Section consists of approximately 15 members (Web Directors, UX Designers, UI Designers, Front-end Engineers), with similar demographics.
SRE/DevOps Engineer, Platform Reliability Engineering Group - Cloud Services Department (CLSD)
RakutenThe 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. The Cloud Services Department (CLSD) at Rakuten Group provides high-quality cloud infrastructure and platform services to application developers across Rakuten. Our mission is to enable secure, scalable, and efficient digital innovation. We deliver key domain services, including compute, storage, core infrastructure components, databases, container platform, observability, and gateway solutions, empowering Rakuten application teams to focus on their core business objectives. The Platform Reliability Engineering Group in the Cloud Services Department manages Gateway, CDN, and Security services, such as the APIC gateway, CDN, and external proxy, that empower services throughout the entire Rakuten Group. We are scaling our infrastructure and reliability capabilities, and we are looking for hands-on engineers to join our multicultural team and help build and operate mission-critical services at enterprise scale, with high quality and SLAs, under a tremendous amount of traffic. As an SRE/DevOps Engineer, you will design, build, and operate the infrastructure, tooling, and automation behind our platform, and own the reliability and operational health of the services you support. We are looking for someone with hands-on experience owning production reliability and a passion for automation, observability, and operational excellence. Your work will include developing, maintaining, and optimizing Ansible playbooks, and ensuring consistent and reliable server configurations across environments; designing, implementing, and maintaining CI/CD pipelines, and collaborating with development teams to integrate automated testing, deployment, and monitoring; building, deploying, and managing containerized applications with Docker, and designing and managing Kubernetes clusters for scalability, reliability, and security; managing production servers for high availability, performance, and security, including Squid proxy servers for caching, filtering, and optimizing network traffic; monitoring server health, participating in on-call rotations, responding to incidents, and driving issues to root cause and permanent fix; owning SLO/SLA targets, improving observability and resilience, and contributing to post-mortems and continuous improvement; and partnering with software engineering teams and architects to promote shared ownership of production reliability.