AI Research Scientist Jobs in Japan

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Mercari, Inc. logo
Full-time|On-site|Minato City, Tokyo, Japan

Join Mercari as an AI Research Scientist in our R4D department, where you will play a pivotal role in advancing innovative technologies. We are looking for passionate individuals with expertise in machine learning and computer vision, particularly in developing large language models (LLMs) that drive societal benefits.This full-time position offers flexible …

Dec 22, 2025
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spellbrush logo
Full-time|On-site|Tokyo

The Research Role:Join our innovative team at spellbrush as an AI Anime Researcher, where your passion for anime and expertise in AI will help us redefine the landscape of anime technology. You will be responsible for designing and developing advanced diffusion models primarily focused on image generation, while also exploring related modalities such as 3D, text, video, and audio.You may be a great fit if:Your love for anime fuels your creativity.At our lab, one of the few globally dedicated to merging deep learning and anime, you’ll utilize your knowledge to create cutting-edge anime models.You have a solid understanding of diffusion models.We seek seasoned researchers who are eager to dive into experimenting and designing large-scale models.You are proficient in Pytorch, and familiarity with JAX is a plus.Our expansive Pytorch and JAX codebases support large-scale TPU training, making these skills essential.You thrive in a collaborative environment.We emphasize rapid transitions from research to production, working closely with our internal studio to ensure game-ready models and continuous quality updates for niji・journey.You excel in small, dynamic teams.With a dedicated AI team of four, you’ll collaborate with some of the leading AI researchers globally, all while working on the most advanced image models available. We highly value the efficiency of in-person teamwork at our Tokyo (downtown Akihabara) or San Francisco offices. Visa sponsorship is available.

Feb 7, 2024
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Mercari, Inc. logo
Full-time|On-site|Minato City, Tokyo, Japan

Join Mercari as a Research Scientist specializing in Augmented Reality (AR) and Spatial Computing. In this full-time role, you will have the flexibility of a full flextime schedule with no core hours, allowing you to manage your work-life balance effectively. You will be based in our Roppongi office, where innovation and collaboration are at the forefront of our mission.About MercariAt Mercari, we strive to circulate all forms of value to unleash the potential within every individual. Founded in 2013 by Shintaro Yamada, our marketplace app was inspired by a desire to help society thrive using the finite resources available to us. By enabling a platform that allows for the exchange of not just goods but ideas and opportunities, we aim to empower everyone to realize their dreams and contribute positively to their communities. Discover more about our mission in our Culture Doc.Team MissionThe Mercari R&D organization, Mercari R4D, is dedicated to pioneering the path towards undiscovered value and fostering future innovations. Our collaborative approach aims to address social challenges while creating new avenues for value creation.

Apr 8, 2026
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Bosch Group logo
Full-time|On-site|Yokohama

Role Overview Bosch Group is seeking a Data Scientist focused on AI and machine learning for customer projects in Yokohama. This position works closely with teams across the company to apply advanced data analytics and machine learning methods to real customer challenges. What You Will Do Apply data analytics and machine learning techniques to develop solutions that improve customer experiences Work with colleagues from different departments to deliver actionable insights Support ongoing efforts to advance Bosch Group’s technology offerings

Apr 15, 2026
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ai& logo
Full-time|On-site|Tokyo

About ai&ai& is an innovative global AI technology company dedicated to addressing the increasing demand for artificial intelligence solutions. We aspire to be a leading AI lab with a focus on localization while simultaneously serving as a global provider of infrastructure and computational resources. Our goal is to create a unified, optimized global platform that combines state-of-the-art data centers, diverse computational services, and advanced model capabilities. We believe that true success in AI development comes from owning and controlling the entire technology stack.At ai&, we empower small, agile teams with the independence necessary to confront major challenges head-on. Our methodology involves breaking down large-scale problems into manageable pieces and collaboratively tackling intricate issues. We are on the lookout for highly motivated, mission-driven individuals who exhibit a strong sense of personal initiative. Curiosity is a cornerstone of talent here, and we seek individuals excited about growing in tandem with our advancing technology and expanding business.We are actively recruiting talent from around the globe, with offices in Tokyo, San Francisco, Austin, and Toronto. We are more than willing to connect with exceptional candidates wherever they may be located.Role OverviewAs our Technical and Specialized Recruiter, you will play a crucial role in identifying and attracting the exceptional talent that ai& requires to fulfill its mission. This position is not about high-volume recruiting; rather, it focuses on precision—sourcing the world's top researchers, engineers, and technical experts and persuading them that their contributions will have the greatest impact at ai&.We are expanding in some of the most competitive talent markets globally, including frontier AI research, kernel engineering, inference optimization, and data center infrastructure. The individuals we seek are often not actively looking for new opportunities; your challenge will be to discover them, understand their motivations, and cultivate relationships that encourage them to join us. Think of this role as more akin to talent intelligence and specialized headhunting within deep technical fields.You will collaborate closely with hiring managers to gain a precise understanding of the technical requirements for each role, develop sourcing strategies that extend beyond conventional channels, and manage the candidate experience from initial outreach through to job offer.ResponsibilitiesSpecialized Technical Sourcing: Design and implement comprehensive sourcing strategies for elusive technical and research talent. Move beyond job boards—identify candidates through research publications, participation in conferences, contributions to open source projects, patent filings, and by nurturing direct networks.Candidate Relationship Building: Foster and maintain relationships with potential candidates, guiding them through the recruitment process and ensuring a positive candidate experience.

Mar 24, 2026
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Appier logo
Full-time|On-site|Tokyo, Japan

About Appier Appier is an innovative software-as-a-service (SaaS) company leveraging the power of artificial intelligence (AI) to enhance business decision-making processes. Established in 2012 with the vision of democratizing AI, Appier is dedicated to transforming AI into tangible returns on investment (ROI) through intelligent software solutions. With 17 offices strategically located across the APAC, Europe, and the U.S., Appier is proud to be listed on the Tokyo Stock Exchange (Ticker number: 4180). Learn more at www.appier.com. The Impact You’ll Make at Appier We are on the lookout for a Senior Machine Learning Scientist to join our Advertising Cloud Optimization team. This team is at the forefront of developing essential machine learning algorithms that enhance campaign efficiency and maximize advertiser ROI. Our programmatic advertising platform operates on a massive scale, processing millions of queries per second (QPS), all powered by our proprietary deep learning models for bidding, pricing, and personalized content delivery. In this pivotal role, you will construct an identity graph to enrich a unified customer profile and identify high-value users to drive return on ad spend (ROAS) through advanced machine learning models. What You’ll Work On Utilize scientific methodologies to develop an identity graph and pinpoint high-value users. Lead online experiments aimed at continuously enhancing ROAS. Manage projects independently, demonstrating ownership and accountability. Collaborate with product stakeholders and backend/frontend teams to deliver effective measurement solutions for our clients. What We’re Looking For A Master’s or PhD degree in Computer Science, Machine Learning, Statistics, or a related field. Proven experience in machine learning and data analysis. Strong programming skills in Python, R, or similar languages. Excellent problem-solving abilities and a passion for data-driven decision making.

Jan 30, 2026
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Shift Technology logo
Full-time|On-site|Japan - Tokyo

Shift Technology stands at the forefront of AI innovation in the insurance sector. By harnessing the power of generative, agentic, and predictive AI, we are redefining the landscape of underwriting, claims processing, and fraud detection, enhancing operational efficiency, delivering exceptional customer experiences, and driving significant business outcomes.Our diverse culture is rooted in trust, innovation, and a commitment to reshaping the insurance industry through our cutting-edge SaaS platform. With a team representing over 50 nationalities, we are collaboratively building the future of insurance.At Shift Technology Japan, we offer a unique opportunity for talented individuals to fast-track their careers in the field of data science.As a data scientist, you will work on a variety of projects, gaining extensive technical and professional experience in data science, data engineering, programming, business insight, and client engagement—skills that are invaluable in any career trajectory.Our company is the ideal size: small enough that every individual's contributions significantly impact overall performance, yet large enough to be a global leader in our industry.We are experiencing rapid growth, providing top contributors with the opportunity to advance to managerial or product tech lead roles faster than in larger organizations.Your Role...As part of the data science team, you will collaborate with our technical experts to play a pivotal role in delivering various solutions to our clients. Your daily responsibilities will include:Building and deploying data processing pipelines for client companies, including batch and real-time data ingestion, data cleaning, information extraction, and fraud detection model tuning.Working closely with clients to understand their needs and feedback, and using this information to enhance our solutions.Conducting research and development for product innovation, focusing on areas such as machine learning, image analysis, natural language processing, trend analysis, and chatbots.Collaborating with the sales team to conduct product demonstrations (including potential international travel!).Mentoring junior data scientists.What You Bring...A Master’s degree in Mathematics, Statistics, or Computer Science (knowledge in machine learning and/or Big Data is advantageous).Experience in object-oriented programming, preferably in Python or Java.

Nov 19, 2025
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Appier logo
Full-time|On-site|Tokyo, Japan

About AppierAppier is a pioneering software-as-a-service (SaaS) provider that leverages artificial intelligence (AI) to enhance business decision-making processes. Established in 2012 with the goal of democratizing AI, our mission is to transform AI into measurable ROI by creating intelligent software solutions. With 17 offices across APAC, Europe, and the U.S., Appier is publicly traded on the Tokyo Stock Exchange (Ticker number: 4180). For further details, visit www.appier.com.Open to Overseas Candidates/Visa SupportThis role is located in Tokyo, Japan. Appier offers visa sponsorship to international candidates, ensuring a smooth transition to Japan.Your Impact at AppierWe are on the lookout for a Senior Machine Learning Scientist to join our Advertising Cloud Optimization team. This team is at the forefront of developing core machine learning algorithms that optimize campaign efficiency and maximize advertiser ROI. Our programmatic advertising platform operates at an immense scale, processing millions of queries per second (QPS), all driven by our proprietary deep learning models for bidding, pricing, and personalized content delivery.Our engineering team boasts a robust technical background, offering an ideal environment for a talented engineer.In this role, you will significantly influence the efficiency and profitability of advertising campaigns by refining models for bidding, pricing, and personalized content recommendations, while ensuring system robustness and scalability in a dynamic market landscape.Key ResponsibilitiesDesign, implement, and productionize state-of-the-art ML models to enhance campaign outcomes.Analyze large-scale user and auction data to uncover predictive patterns and alpha signals that boost bidding and personalization.Collaborate across functions with engineering, product, and data teams to identify opportunities, define roadmaps, and deliver impactful solutions.Continuously enhance system performance through offline experimentation and online testing (e.g., A/B tests, incremental learning).

Oct 7, 2025
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Appier logo
Full-time|On-site|Tokyo, Japan

About Appier Appier is an innovative software-as-a-service (SaaS) company harnessing the power of artificial intelligence (AI) to revolutionize business decision-making. Established in 2012 with the goal of democratizing AI, Appier is dedicated to transforming AI into measurable ROI through intelligent software solutions. With 17 offices across APAC, Europe, and the U.S., we are proudly listed on the Tokyo Stock Exchange (Ticker number: 4180). Discover more about us at www.appier.com. Open to International Candidates/Visa SupportThis position is located in Tokyo, Japan. Appier’s Japan office provides visa sponsorship to facilitate a seamless relocation for international candidates. Your Impact at Appier We are on the lookout for a Senior Machine Learning Scientist to join our Advertising Cloud Optimization team. This team drives the advancement of core machine learning algorithms that enhance campaign efficiency and boost advertiser ROI. Our programmatic advertising platform operates at an extraordinary scale, processing millions of queries per second (QPS), all supported by our proprietary deep learning models focused on bidding, pricing, and personalized content delivery. In this role, you will evaluate ads incrementality across various traffic types, creative formats, and user segments, and leverage machine learning models and AI automation to enhance campaign efficiency. Key Responsibilities Utilize scientific methods to improve ads measurement. Conduct online experiments to consistently enhance ad effectiveness. Independently manage projects from inception to completion. Collaborate with product stakeholders, backend, and frontend teams to deliver measurement solutions for our clients.

Oct 31, 2025
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psicro logo
Full-time|On-site|Tokyo

Join our dynamic team at psicro as a Clinical Research Associate II. In this pivotal role, you will contribute to the advancement of clinical research efforts, ensuring compliance and excellence in our clinical trials. Collaborate with cross-functional teams to facilitate study execution and maintain high standards of quality and integrity.

Jan 13, 2025
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Mercari, Inc. logo
Full-time|On-site|Minato City, Tokyo, Japan

Join Mercari as a Senior Data Scientist and play a pivotal role in shaping our data-driven strategies. With an emphasis on maximizing user engagement and long-term value (LTV), you will design and develop sophisticated models and systems that enhance the overall user experience.In this position, you will collaborate closely with backend teams, infrastructure experts, designers, marketers, and product managers to lead complex projects and technical initiatives. Your contributions will drive architectural design and ensure technical excellence across our platform, influencing decision-making across teams.ResponsibilitiesIdentify impactful opportunities to build data-driven and personalized CRM strategies, fostering cross-functional momentum to bring innovative solutions to life.Design, develop, and deploy inference pipelines (batch/stream) equipped with advanced statistical and machine learning models, robust evaluation frameworks, and comprehensive monitoring.Execute end-to-end data exploration and modeling to alleviate bottlenecks in complex business processes and optimize platform performance.Transform complex technical insights into actionable recommendations, collaborating closely with stakeholders to refine models throughout all stages of the development lifecycle.Propose strategic initiatives that maximize Mercari's data science and engineering capabilities while working in tandem with leadership.Champion best practices in analysis, modeling, and code quality management.Unique ChallengesEnd-to-end project ownership: Lead the entire project lifecycle from initial conceptualization and stakeholder alignment to technical execution and post-release optimization.Defining frontiers: Take charge of building cutting-edge CRM and personalization solutions without existing blueprints, requiring a blend of deep technical expertise and domain intuition.

Feb 20, 2026
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Guidepoint logo
Full-time|On-site|東京都, Japan

Overview:At Guidepoint, our Strategic Research team plays a pivotal role in driving our company's success. We are dedicated to providing our global clients with tailored insights that address their unique business challenges. By thoroughly understanding each client's needs, we empower them to make informed decisions.As a Strategic Research Associate, you will bridge the gap between our diverse clientele and a network of skilled Advisors across various sectors. Your responsibilities will include conducting research on industries pertinent to client inquiries and recruiting top-tier subject matter experts to join our network, ensuring optimal connections. As you hone your skills in recruitment and client relations, you will have opportunities to advance into roles such as Research Manager or Project Manager, gaining exposure to more intricate projects.

Mar 24, 2026
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Appier Inc. logo
Full-time|On-site|Tokyo, Japan

Join Appier as a Senior Machine Learning Scientist!Appier, an innovative leader in AI-native solutions, is dedicated to transforming business decision-making through advanced artificial intelligence. Established in 2012, our goal is to democratize AI, enabling companies to achieve a high return on investment through intelligent software solutions. With a presence in 17 offices across the Asia-Pacific, Europe, and the U.S., we are publicly listed on the Tokyo Stock Exchange (Ticker: 4180). Learn more about us at www.appier.com.Visa Sponsorship for International CandidatesThis role is located in Tokyo, Japan. For overseas applicants, Appier offers visa sponsorship to facilitate your relocation.Your Impact at AppierAs a Senior Machine Learning Scientist, you will join our Advertising Cloud Optimization team, spearheading the development of vital machine learning algorithms that enhance campaign performance and maximize advertiser ROI. Our programmatic advertising platform operates at an extraordinary scale, processing millions of queries per second, all driven by our proprietary deep learning models for bidding, pricing, and personalized content delivery.In this role, you will significantly influence the efficiency and profitability of advertising campaigns by refining models for bidding, pricing, and personalized content recommendations, while ensuring robust system performance in a fast-paced market.Your ResponsibilitiesArchitect, implement, and deploy cutting-edge machine learning models to optimize campaign results.Examine extensive user and auction datasets to uncover predictive patterns and alpha signals that improve bidding and personalization.Collaborate with cross-functional teams in engineering, product, and data to identify opportunities, establish roadmaps, and deliver impactful solutions.Continuously enhance system performance through offline experimentation and online testing methodologies (e.g., A/B tests, incremental learning).Qualifications We SeekA Bachelor’s degree in Computer Science, Mathematics, Electrical Engineering, or a related field; a Master’s or PhD is preferred.Minimum of 4 years of experience in the ad tech industry, focusing on performance optimization and machine learning applications.

Apr 8, 2026
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Mercari, Inc. logo
Researcher - Merpay

Mercari, Inc.

Full-time|On-site|Minato City, Tokyo, Japan

We are looking for a skilled Researcher to join our dynamic team at Merpay, a subsidiary of Mercari, Inc. This role focuses on enhancing customer experiences and fostering business growth through insightful research and analysis.About the RolePosition Type: Full-timeWorking Style: Flexible work hours (No core or flexible time)Location: Roppongi, Minato CityFor more details, please visit our career site.About Mercari GroupFounded in 2013, Mercari has grown from an idea sparked during a global journey by our founder, Shintaro Yamada. Our mission is to create a more sustainable society by circulating value, believing that through technology, we can unlock the potential of all individuals.We aim to connect people globally, enhancing their capabilities and contributing positively to society.Mission of the TeamTo maximize customer value creation and enhance the success probability of our business.Guiding Principles:Challenge existing frameworks and identify core issues.Foster autonomous proposals and create decision-making environments for stakeholders.Always prioritize customer experience and consistently provide exceptional value.Key ResponsibilitiesCommit to improving customer experiences and business growth through collaboration with various departments.Identify challenges based on quantitative and qualitative research.Conduct analyses and provide recommendations to increase the success probability of our products and initiatives.Promote a customer-centric perspective across the organization through research insights.Drive research initiatives utilizing AI (e.g., ResearchOps and developing learning content).Unique ChallengesThis position allows you to impact business strategy and customer experience across departments, not just through individual functions or initiatives.You'll have the opportunity to undertake bold challenges that extend beyond traditional research boundaries, shaping the role of a researcher.Key qualities sought include:Engaging in discussions from the same perspective as stakeholders.A sense of ownership in creating and maximizing customer value, with the courage to propose stops or pivots when necessary.Maintaining ethical judgment in all actions.QualificationsRequired Skills and Experience:Alignment with the mission and values of the Mercari Group.5+ years of practical research experience related to services or products, or equivalent knowledge and skills.Experience in service or product improvement projects through interdepartmental collaboration.Ability to autonomously manage the entire research process from setting research questions to analysis and reporting.Methodologies: Interviews, surveys, field studies, diary studies, or other innovative approaches.Focus areas: Market reality assessment, needs exploration research, concept testing, usability testing, post-launch reviews.Ability to communicate analytical results in a manner that facilitates stakeholder decision-making.A strong curiosity and a profound empathy for understanding customers.Please include documentation outlining your role and responsibilities in previous projects when applying.Preferred Skills and Experience:Capability to formulate research strategies aligned with business roadmaps.Experience reporting and discussing findings with business leaders and executive management.A background in organizational development or people management while actively practicing as a researcher.Experience in other roles such as product design, product management, engineering, or data analysis.Workshop design and facilitation skills.Data extraction and aggregation skills using SQL.A rich variety of life experiences.

Jan 28, 2026
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liquid-ai logo
Full-time|On-site|Tokyo

Join Our Innovative TeamAt liquid-ai, we are not merely creating AI models—we are revolutionizing the very framework of intelligence. Emerging from MIT, our goal is to develop cutting-edge AI systems that excel at any scale. Our Liquid Foundation Models (LFMs) perform where others fall short: on devices, at the edge, and under the pressure of real-time demands. We are not just iterating on traditional concepts—we are designing the future.We recognize that exceptional talent drives remarkable technology. The liquid-ai team is a collective of elite engineers, researchers, and innovators dedicated to crafting the next generation of artificial intelligence. Whether you are involved in shaping model architectures, enhancing our development platforms, or facilitating enterprise deployments—your efforts will directly influence the evolution of intelligent systems.

Sep 29, 2025
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Santen Pharmaceutical Co., Ltd. logo
[Japan] Research Associate in Pharmacology

Santen Pharmaceutical Co., Ltd.

Full-time|On-site|Nara

Join Santen as a Research Associate in Pharmacology, where you will be actively involved in the development of our initial pipeline. As a critical member of the pharmacology team, you will contribute to development projects, plan and execute pharmacological tests for LCM/GE products, and prepare documentation for IND and NDA submissions. Your expertise will also be utilized in designing and implementing pharmacological trials to characterize new products, as well as in the development of in vivo/vitro pharmacological testing methods.

Mar 12, 2026
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Euromonitor International logo
Contract|Remote|Remote — Tokyo, Japan

Join Euromonitor International as a Freelance Market Research Analyst and Interviewer, where you can work remotely from Tokyo, Japan. This freelance contract position allows you to engage in various market research projects across the year. Upon project availability, we will reach out to discuss your suitability and extend an offer for the specified duration, with compensation provided upon completion of required deliverables.As a self-motivated researcher with a background in business, economics, or science, you will lead projects focused on Fast-Moving Consumer Goods (FMCG) and contribute to insightful business intelligence. Supported by a Project Manager, you will be involved in multiple projects and responsible for updating datasets and generating reports for consumer industries.Our research tackles critical questions to deliver valuable insights:What are the sales figures for fruit juice in this region this year? What factors influenced the increase or decline compared to the previous year?Is there a viable market for this product in a specified country? What distribution channels should be utilized for maximum impact?What strategies differentiate company X from company Y, and how are these strategies operationalized?Key Responsibilities:Analyze information across various formats related to diverse industries and geographical areas.Conduct site visits to retail locations for product information such as pricing and availability.Perform secondary research on industry and company sources for internal use and dissemination.Engage in primary research through trade interviews and cold calling, collaborating directly with companies and industry bodies to enhance data.Execute in-depth B2B market research including industry analysis, competitor benchmarking, customer segmentation, and market trend analysis.Process and analyze large datasets in Excel to assess market sizes and brand shares.Analyze both quantitative and qualitative data based on client inquiries.Develop analysis and recommendations supported by your research.Assist project managers in producing high-quality, client-ready research outputs (presentations, written analyses, databases, etc.).

Jan 7, 2025
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psicro logo
Full-time|On-site|Tokyo

We are seeking a dedicated and skilled Senior Clinical Research Associate I to join our esteemed team at psicro in Tokyo. In this role, you will be responsible for overseeing clinical trials and ensuring compliance with regulatory requirements while contributing to the advancement of medical research.

Aug 12, 2025
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Field AI logo
Full-time|On-site|Toyko

Field AI is at the forefront of revolutionizing robotic interactions with the real world. We are dedicated to creating risk-aware, reliable, and field-ready AI systems designed to tackle the most intricate challenges in robotics. Our approach transcends conventional data-driven strategies and purely transformer-based architectures, as we forge a new path with solutions already deployed globally, yielding tangible results and continually enhancing models through real-world applications.We are seeking a talented Technical Support Specialist who possesses a strong enthusiasm for robotics and adept problem-solving skills. In this pivotal role, you will partner with our valued customers, ensuring they leverage the full capabilities of our state-of-the-art robotic systems. Collaborating closely with our engineering and product teams, you will immerse yourself in technical challenges and advocate for the user experience, influencing our technology's evolution. If you are passionate about advanced hardware and software systems and take pride in guiding users through complex technologies with confidence, this position presents a rewarding opportunity to make a significant impact.

Apr 28, 2025
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Guidepoint logo
Internship|On-site|東京都, Japan

Overview: The Strategic Research team is essential to Guidepoint's success, dedicated to delivering valuable insights and services to clients globally. We focus on understanding each client's specific business challenges, equipping them with the insights necessary for informed decision-making. As a Strategic Research Intern, you will collaborate with Associates, Research Managers, and Project Managers within the Strategic Research team, assisting with multiple projects across various industries. If you have a passion for exploring diverse sectors and wish to enhance your communication and interpersonal skills, this opportunity is perfect for you.

Feb 9, 2026

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