Engineering Jobs in Japan
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.
109 open positions
Refine with filters →Backend Engineer - Travel Development Department (TDD)
RakutenRakuten Travel is a leading online travel service in Japan, dedicated to “Making People Happy with Travel”. Since our founding in 1996, we have consistently led the industry, challenging the norms and fostering innovation. With growing aspirations to expand beyond borders as a Global Innovation Company, we are not confined to Japan but continue to strive daily to become the world's premier travel reservation service. At the forefront of the Commerce & Marketing Company, Travel Development Department (TDD) is distinctive for overseeing the entire spectrum of Rakuten Travel's development and operations. We primarily focus on the following key areas: Globalization of Rakuten Travel to compete in global markets; Continuous improvement and strengthening Rakuten Travel’s presence in Japan to increase customer satisfaction. We are seeking like-minded individuals who resonate with our purpose. Join us at Rakuten Travel, propose new forms of travel to people around the world, and strive to be pioneers shaping the future of travel. Your passion and creativity will breathe new life into the travel industry, filled with infinite possibilities. We eagerly await your application and potentially invite you to take on challenges in a diverse environment in collaboration with new peers. In this position, you will be responsible for the development and operation of a wide range of travel services provided by Rakuten Travel, including hotels, air tickets, and package tours. This is a challenging role aimed at leading the travel industry, where you are expected to deliver services using cutting-edge technology to meet the diverse travel needs of today. Rakuten Travel is among the top online travel sites in Japan, requiring development skills to support its large-scale transaction processing. Particularly during the quarterly Rakuten Super Sale, you will be expected to handle over 150 reservations per second and manage search traffic exceeding 800 queries. The volume of this traffic is anticipated to increase in the future, making the development and operation of systems capable of handling high loads a critical responsibility. Working at Rakuten Travel offers abundant opportunities for technical challenges and growth, leading to potential career advancement in an attractive position. In this position, you will primarily be responsible for the development and operation of Rakuten Travel's API services. Specifically, you will engage in backend system development using Java and Spring, covering a wide range of tasks from architecture consideration and system design to responding to user inquiries. Collaboration with related teams within the Rakuten Group (such as Payment, Points, Membership) and handling large-scale traffic will also be required. This role offers the opportunity to refine your technical skills while working collaboratively with the team to achieve results. As a backend engineer in this position, you are expected to become a role model for the next generation of engineers and lead the organization's growth.
Software Engineer
MicrosoftAs a Software Engineer at Microsoft, you will be responsible for designing, developing, and maintaining software applications. You will work closely with cross-functional teams to deliver high-quality software solutions that meet customer needs.
DevOps Engineer - Conversational Experiences Department (CXD)
RakutenRakuten Group, Inc. is a global leader in internet services that empower individuals, communities, businesses, and society. Founded in Tokyo in 1997 as an online marketplace, Rakuten has expanded to offer services in e-commerce, fintech, digital content, and communications to approximately 1.7 billion members around the world. The Rakuten Group has nearly 32,000 employees and operations in 30 countries and regions. For more information, visit https://global.rakuten.com/corp/. The AI & Data Division (AIDD) creates powerful, customer-focused search, recommendation, data science, advertising, marketing, price, and inventory optimization solutions for a variety of businesses across the Rakuten Group. As part of AIDD, the Conversational Experiences Department (CXD) focuses on AI for customer service. We build conversational AI products such as chatbots, voicebots, and copilot tools to support human operators. You will join a 60-person AI for Customer Service team: engineers, TPMs, data analysts, dialogue designers: responsible for modernizing legacy contact-center tooling and workloads into an agentic Generative AI stack. We already power Rakuten Mobile’s pre-sale onboarding and support (“RMAA”) and are building the pipeline for customer service and engagement experience. Now, we’re moving from a successful V1 into the scale-up phase: expanding to all 70 BUs and leveraging AI to multiply Rakuten’s core capabilities in e-commerce, finance, logistics, digital content, and beyond. As the CXD expands its AI-powered products and services across Rakuten Group, we need a skilled DevOps professional to build and operate the reliable, scalable, and secure infrastructure behind them. In this role, you will enable engineering and data teams to deliver AI solutions faster and more confidently by improving deployment automation, cloud operations, system observability, and platform reliability. Your work will directly support customer-facing services used across Rakuten’s global ecosystem. A full-time, mid-level (2-3 years) role requiring a Bachelor's degree in Computer Science, Engineering, or a related field, working alongside senior engineers in a contributor capacity rather than a lead position. Core focus is Kubernetes-based infrastructure and cloud-native services, with hands-on use of Docker, Kubernetes, one major cloud platform (AWS/GCP/Azure), CI/CD tools (Jenkins/GitLab CI), infrastructure-as-code (Terraform/Ansible), monitoring/logging tools (Prometheus/Grafana/ELK), and Python scripting. The role includes participation in a 24/7 on-call rotation (incident response, postmortems, runbook upkeep), applying security and compliance practices to infrastructure and pipelines, and exposure to AIOps tooling and AI-driven operational insights - all while collaborating closely with software development teams and cross-functional/international stakeholders, for which mandatory written and verbal English proficiency is required.
Applied AI Engineer - Tokyo
OpenAIAs an Applied AI Engineer you will partner directly with leading organizations to design, build, and deploy AI systems that deliver measurable business outcomes. You will combine deep technical judgment, hands-on engineering, and customer leadership to take ambitious ideas from use-case selection and architecture through prototyping, evaluation, production launch, and scale. You will write and debug code, build evaluation systems, resolve complex integrations, and guide decisions involving model behavior, reliability, latency, cost, safety, security, governance, and operational readiness. Success is measured by production systems, sustained adoption, and meaningful customer impact—not simply activity or successful demonstrations. This is a rare opportunity to work on consequential real-world deployments at the frontier of AI while directly influencing how OpenAI’s products evolve. This role is based in Tokyo, Japan. We use a hybrid work model of 3 days in the office per week and offer relocation assistance to new employees. In this role, you will partner directly with enterprise customers to identify high-value opportunities and translate them into technical architectures, implementation plans, evaluation strategies, and measurable success criteria. Design, build, and deploy AI systems that solve important customer problems and produce measurable business outcomes. Work hands-on in code to build prototypes, evaluation harnesses, reference implementations, integrations, and production accelerators. Make sound technical decisions across models, agents, retrieval, tools, data, reliability, observability, latency, cost, safety, security, and governance. Diagnose complex implementation challenges, reproduce failures, test hypotheses, and drive blockers toward resolution. Help customers progress from promising prototypes to reliable production systems, sustained adoption, and scaled impact. Partner closely with customer engineering teams and OpenAI Product, Research, Engineering, Security, and go-to-market teams, translating deployment experience into high-signal product feedback. Create reusable architectures, tooling, playbooks, and technical guidance that accelerate future enterprise deployments.
Applied AI Engineer, Startups
OpenAIWe are seeking a technically proficient, business-minded Applied AI Engineer to help push the frontier of advanced AI with our strategic startup customers. You'll work with some of the most exciting AI startups in the world, guiding them through ideation, development, delivery, and scaling to accelerate and maximize the value of what they build on our platform. You will have the opportunity to work on the most novel and creative use cases being built on our API, serving as a critical partner in collecting and delivering high-fidelity product and model feedback internally. You will collaborate closely with Sales, Solutions Engineering, Applied Research, and Product teams, and you will report to the Startups Applied AI Lead. This role is based in our Tokyo, Japan office. We use a hybrid work model of 3 days in the office per week and offer relocation assistance to new employees. In this role, you will: Partner closely with strategic startup customers as their technical thought partner to build novel applications on our API, helping them rapidly move from ideation to scale. Provide proactive guidance to maximize business impact and accelerate application development. Experiment and prototype alongside customers, demonstrating practical use cases. Contribute to open-source resources and scale the function by sharing knowledge, codifying best practices, and publishing useful resources. Synthesize and deliver valuable feedback to the Product and Research teams. Build relationships within the startup ecosystem, serving as a technical partner to both individual customers and the broader community.
Senior Mission Operations Engineer (Test-focused)
iSpaceispace, inc. is looking for a Senior Mission Operations Engineer (test-focused) to join our growing team. The Mission Test and Operations team is the heart of mission execution, where we prove readiness on the ground before ever stepping on console. As a Senior Mission Operations Engineer, you will be the bridge between the worlds of system testing and real-time operations. In this role, you will drive a “Test-As-You-Fly” philosophy to ensure that our tests are truly representative of our operations. You will also have the opportunity to follow the mission lifecycle to touchdown by conducting the test campaign, leveraging the results to mitigate operational risk, and ultimately commanding those same procedures from the Mission Control Center as we transit to the Moon.
Senior Mission Operations Engineer (Operations focused)
iSpaceispace, inc is looking for a Senior Mission Operations Engineer to join our growing team. The Mission Test and Operations team is the heart of mission execution, where we prove readiness on the ground and then step on console to guide the spacecraft to the Moon. As a Senior Mission Operations Engineer, you will be responsible for operational preparations and will certify to sit on console as a Flight Director. In this role, you will have the opportunity to lead or support the operation of various activities such as orbital trajectory maneuvers, payload operations, the landing sequence, and surface operations. The job begins from the design phase of the mission lifecycle and ends at decommissioning and closeout. You will both prepare the products and crew for flight readiness and then execute that plan after separation from the launch vehicle. If you embody discipline, safety, quality, have a team-driven spirit, and would like to call the Mission Control Center home, then this is the moonshot for you.
Ground Systems engineer (SIL/PIL/HIL specialized)
iSpaceispace, inc. is looking for a Ground Systems engineer to join our growing team in Tokyo. The Ground Systems team forms the backbone of ispace’s Test and Flight Operations, responsible for designing, building, and maintaining the full infrastructure required to support mission testing and operations. This includes the Mission Control Center, Mission Control Software, operational tools, and the end-to-end test environments that enable mission readiness. As a Ground Systems Engineer, your work directly enables communication with the spacecraft and underpins every phase of mission test and execution. You play a pivotal role in ensuring that missions are conducted safely, reliably, and efficiently—designing and maintaining the infrastructure, software, and operational workflows that make real-time spacecraft operations possible. Your contributions not only ensure mission success, but also streamline operations and empower flight teams to perform at their best. As a Ground Systems Engineer specialized in Software-in-the-Loop (SIL) and Hardware-in-the-Loop (HIL) platforms, you will design, develop, and maintain the simulation and validation environments used to test and verify the next generation of ispace spacecraft. You will play a critical role in enabling a “Test-As-You-Fly” philosophy, ensuring that ground infrastructure and spacecraft testbeds faithfully replicate real mission conditions, providing a realistic and representative environment for validation and operations.
Ground Systems engineer (Ground Operations)
iSpaceispace is looking for a Ground System Engineer to join our growing team in Tokyo. The Ground Systems team forms the backbone of ispace’s Test and Flight Operations, delivering the infrastructure, systems, and tools required to support mission testing and operational activities across the full mission lifecycle. This includes the design, development, and maintenance of the Mission Control Center, Mission Control Software, operational toolchains, and end-to-end test environments that ensure mission readiness. As a Ground Systems Engineer, you will be responsible for the design, development, and maintenance of Mission Control Software supporting ispace’s global operations. You will oversee the end-to-end data flow between users and the spacecraft, ensuring reliable, secure, and efficient handling of telemetry and telecommand data. This includes defining and implementing data encoding, processing, and encryption mechanisms across the ground segment and its interfaces.
Mechanical AIT Engineer
iSpaceispace, inc. is looking for a Mechanical AIT Engineer to join our growing production team. Join the Assembly, Integration & Testing (AIT) team and play a key role in the development, integration, verification, and testing of spacecraft systems. In this position, you will collaborate closely with design, systems, and manufacturing engineering teams to ensure spacecraft and payload hardware are designed, built, and tested to the highest quality standards. You will support assembly and test operations, manage verification activities, drive continuous improvement initiatives, and lead non-conformance resolution efforts to enhance product reliability and mission success. This role requires a hands-on engineer with strong technical judgment, a passion for aerospace hardware development, and the ability to contribute across the full spacecraft lifecycle—from design reviews and prototyping through integration, testing, and flight readiness. Reporting to the Mechanical AIT Team Lead, you will help establish and maintain best practices, processes, and standards that enable the successful delivery of complex space systems.