Qa Engineer Jobs in Tokyo, Tōkyō

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Full Stack Engineer

Tokyo,
remote
Permanent
9.0M - 12.0M JPY / Yearly
Company Profile<ul><li>Global professional services firm is looking for a Software Engineer to build and maintain software solutions supporting the business side.</li></ul> The Role<ul><li>Design, develop, test, and maintain scalable, secure software applications aligned with business goals and user needs.</li><li>Work with product, design, and QA teams, and join code reviews and architecture and technical design discussions.</li><li>Build CI/CD pipelines, automate deployments, and monitor and troubleshoot production systems.</li><li>Maintain documentation for the codebase, APIs, and processes, and support internal and external audits and compliance.</li></ul> Your Skills<ul><li>5+ years of web app development with Django and ReactJS (mandatory).</li><li>Proficiency in Python, JavaScript, TypeScript, and PostgreSQL.</li><li>Hands-on Git and Docker, plus cloud experience (Microsoft Azure preferred).</li><li>Able to handle both development and maintenance work.</li><li>Passion for using AI to drive innovation and streamline processes.</li><li>Japanese: JLPT N2, English: business level</li><li>Nice to have: CI/CD (GitHub Actions, Azure DevOps), testing frameworks (PyTest, Jest, Cypress), system design, Agile/Scrum, REST/GraphQL, security best practices, monitoring (Prometheus, Azure Monitor), mentoring or leading small projects.</li></ul> Key Highlights of the Role<ul><li>Work on software for a leading global professional service company</li><li>Closely work with AI and build LLM products from day 1</li><li>Take part in architectural decisions, with room to mentor juniors and lead small projects.</li><li>Possible to work remotely with very rare office days</li></ul> Location Tokyo Salary9 - 12 million yen Reference Number: 06940-0013521216 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/TmFuY3kuWXVhbi45NTkwOS4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
2026-10-07T06:46:39Z

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

Windows Engineer

Tokyo,
remote
Permanent
12.0M - 12.0M JPY / Yearly
<div><h2>Company Profile</h2>A leading global financial services organization with operations across multiple international markets. The company provides investment banking, capital markets, wealth management, and financial technology services, supported by a highly diverse and global technology organization. Its technology teams play a critical role in driving infrastructure modernization, cloud adoption, and operational excellence across the business.The Role<ul><li>Design, build, test, and deliver enhancements for enterprise compute platforms and cloud infrastructure services.</li><li>Provide L2/L3 support for globally deployed compute platforms, ensuring rapid incident resolution in a Follow-the-Sun support environment.</li><li>Partner with application teams to deliver reliable, scalable, and secure infrastructure services throughout the application lifecycle.</li><li>Drive automation initiatives to improve operational efficiency, reduce manual processes, and mitigate risks.</li><li>Collaborate with engineering and infrastructure teams to implement platform improvements and technology upgrades.</li><li>Create and maintain operational documentation, runbooks, and provide technical guidance to team members.</li></ul>Your Skills <ul><li>Experience supporting enterprise infrastructure, cloud platforms, or compute environments.</li><li>Strong knowledge of Linux and/or Windows Server administration.</li><li>Experience with public and private cloud technologies.</li><li>Understanding of platform operations, monitoring, incident management, and service restoration processes.</li><li>Experience providing L2/L3 technical support in mission-critical environments.</li><li>Knowledge of automation, scripting, and infrastructure optimization practices.</li><li>Ability to work collaboratively with application, engineering, and infrastructure teams.</li><li>Strong troubleshooting, analytical, and problem-solving skills.</li><li>Excellent communication skills in a multinational environment.</li></ul>Key Highlights of the Role <ul><li>Opportunity to work within the technology division of a leading global financial services organization.</li><li>Exposure to large-scale enterprise cloud and infrastructure environments.</li><li>Work in a highly international team with members from diverse backgrounds and nationalities.</li><li>Involvement in cloud transformation, platform modernization, and automation initiatives.</li><li>Exposure to Follow-the-Sun global operations supporting business-critical systems.</li><li>Strong focus on professional development, training, and career growth.</li></ul>Location TokyoSalaryJPY 12,000,000Reference Number06940-0013483971 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.</div> <img src="https://counter.adcourier.com/SGluc29uLkxldW5nLjc4MzEzLjEwODk4QHJoaWpwLmFwbGl0cmFrLmNvbQ.gif">
2026-08-21T06:22:20Z

3 results for Qa Engineer in Tokyo, Tōkyō