Lead Data Scientist Jobs in Tokyo, Tōkyō

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Data Scientist

Tokyo,
remote
Permanent
10.0M - 10.0M JPY / Yearly
As a data scientist on our data team, you will play a pivotal role in transforming the claims department into a truly data-driven organization.Key responsibilities:<ul><li>Support the development and implementation of practical AI code and solutions tailored to various business use cases. </li><li>Assist with initiatives related to the development, validation, evaluation, and deployment of machine learning models; analyze structured and unstructured data using Python and relevant data science libraries. </li><li>Collaborate with business stakeholders to understand business requirements and translate them into data-driven solutions. </li><li>Conduct Exploratory Data Analysis (EDA) to derive insights that inform decision-making. </li><li>Support AI governance to ensure the safe and continuous deployment of AI models. </li><li>Work collaboratively with cross-functional teams-including IT, business units, and project managers-leveraging strong documentation skills. </li><li>Continuously learn about and deepen knowledge regarding emerging AI and generative AI technologies, as well as industry trends.</li></ul>Location<ul><li>Tokyo </li></ul>Salary<ul><li>10 million yen</li></ul> <pre id="tw-target-text" class="tw-data-text tw-text-large tw-ta" dir="ltr" tabindex="-1" data-placeholder="翻訳" data-ved="2ahUKEwisk7n-upKXAxUAr1YBHYP-AtUQ3ewLegQIDhAV"> Reference No. 67040-0013502805 </pre>By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.<img src="https://counter.adcourier.com/U21haWwuU2FmaS42Njc1NS4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
2026-09-29T08:29:06Z

Data Scientist - ML/AI

Tokyo,
remote
Permanent
9.0M - 14.0M JPY / Yearly
Company ProfileA major Japanese internet services conglomerate is hiring a Senior Data Scientist for its global ad technology division. The division runs the advertising systems behind the group's e-commerce and digital services, with a diverse team spread across Japan, Singapore, India, China, and the UK. The Role<ul><li>The in-house ad serving platform handles tens of thousands of QPS at under 100ms latency and processes tens of billions of log records each month. It is now strengthening the in-house development of its core algorithms to set itself apart in a competitive, AI-driven market.</li><li>You will drive ad delivery optimization end to end, from problem definition and KPI design through modeling, online deployment, evaluation, and continuous improvement.</li><li>Your focus will be on price optimization, CTR/CVR and value prediction, and creative optimization, including feature engineering and offline evaluation and simulation.</li><li>You will design A/B tests and bandit experiments, plan rollouts, and build MLOps pipelines with monitoring, drift detection, and automated rollback.</li><li>You will join a team of about 20 engineers (SRE, backend/frontend, data, SDK, QA) and work closely with product, engineering, and sales/operations stakeholders.</li></ul> Your Skills Mandatory<ul><li>5+ years of hands-on data analysis and machine learning experience with Python and SQL (Pandas, NumPy, scikit-learn)</li><li>Experience processing large-scale data (e.g., Spark, BigQuery) and building reproducible analytics environments</li><li>A strong foundation in statistics, causal inference, and experimental design, including A/B test design and analysis</li><li>Experience developing ML models (GBDT, logistic regression, simple neural networks) with rigorous offline/online evaluation and calibration</li><li>Knowledge of digital advertising (CTR/CVR prediction, bidding, budget pacing), or optimization experience in an adjacent domain</li><li>Production experience with model deployment, pipeline operations, monitoring, and drift detection</li><li>A degree in computer science, statistics, applied mathematics, or a related field, or equivalent practical experience</li><li>Fluent English, or TOEIC 800+ or equivalent</li></ul> Desired<ul><li>Knowledge of ad auctions and mechanism design (first-/second-price auctions, bid shading, reserve price optimization)</li><li>Hands-on experience with price optimization methods such as Bayesian optimization, contextual bandits, or reinforcement learning</li><li>Experience with creative optimization, streaming platforms (Kafka/Flink/Beam), and real-time inference</li><li>MLOps practices (feature stores, CI/CD, Docker/Kubernetes) and GCP experience (BigQuery, Vertex AI, Dataflow)</li><li>Business-level Japanese (JLPT N2 or equivalent)</li></ul> Key Highlights of the Role <ul><li>Build the core algorithms of a large-scale ad platform used across one of Japan's largest internet ecosystems.</li><li>Take ownership of the full ML lifecycle, from hypothesis to production, with real business impact.</li><li>Work hands-on with high-traffic, low-latency systems and big data on a modern GCP stack.</li><li>Collaborate in a multinational team across five countries and work alongside leading external ad platforms.</li></ul> Location Tokyo Salary9 - 14 million yen Reference Number: 06940-0013531637 By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.<img src="https://counter.adcourier.com/U21haWwuU2FmaS41MTE5MS4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
2026-10-26T02:19:29Z

AI Engineer

Tokyo,
remote
Permanent
8.0M - 12.0M JPY / Yearly
Company ProfileFast-growing, post-IPO travel tech company building SaaS products for hotels worldwide is looking for an AI / Machine Learning Engineer. The Role<ul><li>This year's core mission is rebuilding a chatbot used by thousands of hotels as an AI agent that answers guest questions and takes actions on behalf of hotel staff.</li><li>You will train, deploy and evaluate LLM and traditional ML/DL models, and own their reliability and performance in production.</li><li>You will build data pipelines (BigQuery + dbt) and work closely with backend teams, product managers and business stakeholders on GCP.</li></ul> Your Skills <ul><li>2+ years of experience as a full-stack data scientist, ML engineer and/or AI engineer.</li><li>Strong statistics and ML fundamentals, plus hands-on experience building with LLMs (e.g., LangChain, Google ADK).</li><li>Production-level Python, SQL, and orchestration tools such as dbt, Airflow or Prefect.</li><li>Fluent English</li><li>RAG/embeddings, agentic systems (tool calling, guardrails) and LLM eval tooling (LangSmith, Langfuse, Braintrust) are beneficial.</li></ul> Key Highlights of the Role <ul><li>Greenfield opportunities, with the freedom and ownership to choose how solutions are built.</li><li>Modern GCP stack in an engineering team with strong fundamentals and diverse backgrounds.</li><li>Flextime with no core time, and hybrid work (2 office days/week in Nishi-Shinjuku).</li></ul> Location Tokyo Salary8 - 12 million yen Reference Number: 06940-0013536008 By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.<img src="https://counter.adcourier.com/TmFuY3kuWXVhbi4wMjg0MS4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
2026-11-02T02:38:02Z

[In-house] - SAP FI/CO Solution Architect

Tokyo,
remote
Permanent
12.0M - 16.0M JPY / Yearly
Company ProfileA leading Global beverage enterprise with over 10k employees in Japan, producing and distributing diverse products across the country. Operating independently with a commitment to innovation, it collaborates with a global brand while catering to local preferences. The RoleYou will be a core member of the SAP S/4HANA Finance team, designing, implementing, improving and running SAP FI (Financial Accounting) and CO (Controlling) solutions. You will translate business requirements into scalable SAP solutions and help drive finance transformation and digitalization across the company. Key Responsibilities<ul><li>Architecture: Design the overall SAP Finance architecture and integrate it with surrounding systems (sales, procurement, logistics, tax, treasury, data platforms, reporting tools); lead S/4HANA expansion, upgrades and release management</li><li>Solution delivery: Work with finance teams to gather accounting, controlling, closing and reporting requirements, and turn them into SAP FI/CO designs and configurations</li><li>SAP FI: GL, AP, AR, fixed assets, bank accounting, period-end closing, tax, and statutory/management reporting</li><li>SAP CO: Cost center accounting, internal orders, product costing, profitability analysis (CO-PA), profit center accounting, allocations, planning and budgeting</li><li>Project and technical lead: Fit & Gap analysis, testing, data migration, master data management, vendor/partner management, and maintaining architecture standards</li><li>Operations and user support: UAT and go-live support, user training, incident handling, continuous improvement, and coordination between IT, finance and vendors</li></ul> Your Skills <ul><li>5+ years of experience in SAP Finance implementation, improvement and operations</li><li>Hands-on experience with SAP FI/CO configuration on S/4HANA or ECC</li><li>Experience in SAP architecture and system integration</li><li>Experience in finance transformation projects</li><li>Understanding of how finance links to procurement, sales, logistics, tax and reporting</li><li>Strong solution design, logical thinking and problem-solving skills</li><li>Strong coordination and communication skills with stakeholders</li><li>Business-level English</li><li>Degree in computer science, accounting, finance or a related field</li></ul><ul><li>Nice to have: SAP FI or CO certification</li></ul> Key Highlights of the Role <ul><li>Lead the evolution of S/4HANA in a large-scale environment</li><li>Be involved in architecture design and DX initiatives, not just implementation</li><li>Grow as a finance IT specialist in a global environment</li></ul> Location Tokyo Salary12 - 16 million yen Reference Number: 06940-0013531665 By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.<img src="https://counter.adcourier.com/RnJhbmNlcy5GYW4uNTU5NTAuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
2026-10-26T07:12:59Z

Artificial Intelligence (AI) Engineer

Tokyo,
remote
Permanent
25.0M - 25.0M JPY / Yearly
Company ProfileA global technology consulting and digital transformation organization that helps enterprises accelerate innovation through AI, cloud, data, and modern application solutions. The Role<ul><li>Lead AI-driven business transformation initiatives, partnering with stakeholders to define current (As-Is) and future (To-Be) operating models and business processes.</li><li>Gather and define business and functional requirements with AI utilization in mind, translating business challenges into scalable AI and Microsoft technology solutions.</li></ul> Your Skills <ul><li>Experience in AI, data analytics, digital transformation, or enterprise application projects utilizing Microsoft technologies such as Azure AI, Azure OpenAI Service, Microsoft Copilot, Power Platform, and Dynamics 365.</li><li>Strong experience in business process analysis, requirements gathering, fit-gap analysis, solution design, and stakeholder management.</li></ul> Key Highlights of the Role <ul><li>Work on cutting-edge AI and Microsoft technology projects that are transforming how organizations operate and make decisions.</li></ul> Location Tokyo Salary25 million yen Reference Number: 67040-0013528592 By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure. <img src="https://counter.adcourier.com/Z2xvcmlhLmdlLjgyODM1LjEwODk4QHJoaWpwLmFwbGl0cmFrLmNvbQ.gif">
2026-11-05T08:20:45Z

Software Engineer

Tokyo,
remote
Contract
16.9M - 16.9M JPY / Yearly
Company ProfileA venture-backed AI technology company focused on developing verifiable and explainable AI solutions for scientific and engineering applications. The company combines advanced machine learning, formal reasoning, and domain expertise to accelerate innovation in complex technical fields, including engineering design, semiconductors, and scientific research. The Role<ul><li>Develop and maintain backend applications using Python/FastAPI and frontend applications using React/Next.js</li><li>Design APIs and databases, and optimize SQL performance</li><li>Contribute to system architecture and technical decision-making</li><li>Build scalable, secure, and reliable systems</li><li>Develop and enhance AI-powered features and agent workflows</li><li>Integrate and utilize LLM technologies and AI platforms</li><li>Perform unit, integration, and end-to-end testing</li><li>Participate in code reviews and quality improvement initiatives</li><li>Collaborate closely with Tech Leads and AI Engineers</li><li>Support cross-functional development teams and knowledge sharing</li></ul> Your Skills <ul><li>Cloud platforms and infrastructure</li><li>AI/LLM integration (OpenAI, Anthropic, Vertex AI, etc.)</li><li>Testing (Unit, Integration, E2E)</li><li>System design and scalable architecture</li><li>CI/CD and software engineering best practices</li><li>Troubleshooting and production support</li></ul> Key Highlights of the Role <ul><li>Work on next-generation AI products for science and engineering.</li><li>Build both full-stack applications and AI-powered features.</li><li>Influence system architecture and technical strategy.</li></ul> Salary8,125 JPY　〜 hourly Reference Number: 06940-0013502812 By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.<img src="https://counter.adcourier.com/bWljaGFlbC5oYWdlZG9ybi45MjQ2Ni4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
2026-10-02T03:30:41Z

Machine Learning Engineer, Researcher

Tokyo,
remote
Permanent
10.0M - 20.0M JPY / Yearly
Company ProfileA leading Japanese technology company operating a popular marketplace platform and digital payment services. The Role<ul><li>Research and develop advanced ML algorithms, particularly in NLP and information retrieval.</li><li>Explore and apply cutting-edge research to improve ML models.</li><li>Collaborate with cross-functional teams to translate research into practical solutions.</li><li>Stay current with the latest ML developments and academic publications.</li></ul> Your Skills <ul><li>PhD in AI, Machine Learning, or a related field preferred.</li><li>5-6+ years of industry experience in ML/AI research.</li><li>Strong algorithmic and research capabilities, with a solid understanding of ML fundamentals.</li><li>Expertise in NLP, information retrieval, recommendation systems, ad ranking, or computer vision.</li><li>Publications at leading AI/ML conferences (e.g., ACL) are highly valued.</li><li>Ability to critically evaluate and discuss recent academic research.</li></ul> Additional Information<ul><li>Location: Japan (relocation required).</li><li>Overseas applicants are welcome.</li><li>Relocation assistance provided.</li><li>Agentic AI experience is a plus, but not required.</li></ul> Location Tokyo Salary10 - 20 million yen Reference Number: 06940-0013536082 By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (<a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.<img src="https://counter.adcourier.com/TGluaC5EYW5nLjIzNjcxLjEwODk4QHJoaWpwLmFwbGl0cmFrLmNvbQ.gif">
2026-11-04T01:47:08Z

7 results for Lead Data Scientist in Tokyo, Tōkyō