Data Scientist, Analytics - Tokyo,Japan.

About Appier

Appier is an AI-native Agentic AI as a Service (AaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information.

About the role

Appier's Ad Cloud handles millions of bid requests per second, and that number keeps climbing. Behind every request is a chain of decisions: how much to bid, what to recommend, which creative to show, how fast the system responds. Each one is a lever on campaign performance, and at this scale a 1% improvement is enormous.

Your job is to find those levers in the data. You will turn campaign, auction, and user-behavior data into insights about where the next performance gain is, prove it with rigorous A/B testing, and drive the change across the organization. This is not a back-office role. You will work hand-in-hand with ML scientists, engineers, product managers, and the operations team, and you are expected to set the agenda with data and push until the improvement shows up in live campaigns.

AI now handles much of the mechanics: writing queries, drafting code, producing charts. What it does not do is decide which question is worth asking, notice that a number does not add up, or keep digging when the first explanation is too convenient. That is the job. We are looking for someone who is relentlessly curious about why, and who cannot leave an unexplained anomaly alone.

What You Will Do

• Find where performance comes from. Mine campaign, bidding, and user data to identify the highest-leverage opportunities to improve online campaign performance, and turn them into testable hypotheses.
• Get to the root cause. When performance shifts or metrics contradict each other, dig until you understand the real mechanism, not just the correlation.
• Drive improvements across functions. Partner with ML scientists on bidding and recommendation algorithms, with product and creative teams on creative serving, with engineering on system improvements, and with operations on how campaigns are run. Your insights set the direction; you follow through until the impact lands in production.
• Own experimentation. Design, run, and read a high volume of A/B tests on live campaigns. Define metrics and guardrails, diagnose noisy results, and make clear ship / no-ship calls.
• Build the foundation and make it visible. Define metric frameworks, build the datasets and pipelines behind them, and deliver dashboards that let stakeholders monitor campaign health and act on findings without waiting for a report.