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Appier

Senior Machine Learning Scientist (ROAS) - Tokyo

Tokyo, Japan
Level
Senior

Not stated in the posting: salary, work type, visa.

Open. First seen 2 October 2026.

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About the role

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.

The Impact You’ll Make at Appier

Appier is seeking a Senior Machine Learning Scientist to join our Advertising Cloud Optimization team, which leads the development of core machine learning algorithms driving campaign efficiency and advertiser ROI. Our programmatic advertising platform operates at a massive scale, handling over multi millions queries per second (QPS), all powered by our proprietary deep learning models for bidding, pricing, and personalized content delivery.
In this role, you’ll build identify graph to enrich unified customer profile and also identify high purchase value users to drive ROAS by machine learning model.

What You’ll Work On

  • Leverage scientific methods to build identify graph and identify high-value users
  • Drive online experiments to continuously improve ROAS
  • Own the project independently.
  • Partner with product stakeholder, backend and frontend to provide measurement solution for our customers.

What We’re Looking For

  • Master’s or PhD’s degree in Computer Science, Machine Learning, Statistics, or related field.
  • 3+ years of industry experience on identify graph, ID mapping and cross-device mapping in digital Ads related fields, and generate mapping and profile under large-scale data.
  • Proficiency in Python and SQL experience with modern ML frameworks (PyTorch, TensorFlow, etc.).
  • Strong ownership and collaboration skills.

#LI-AK1

What this role asks for

Particular to this role

TensorFlow

Rare in Appier's other 43 open postings.

Standard for data science / ML roles

Machine Learning · PyTorch · SQL

Common in data science / ML postings at any company.

In most of Appier's ads

Python

Named in most of its open postings, whatever the role.

Read against Appier's other open postings on this site.

The team: Scientist HIRES STEADILY

This role is one of 12 open in Scientist. 1 was posted in the last 30 days and the oldest in January: a team that hires all year rather than one being built.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

Python (11 of 12), Machine Learning (10 of 12), PyTorch (8 of 12), SQL (7 of 12), Deep Learning (6 of 12), LLM (6 of 12), TensorFlow (6 of 12)

OTHER ROLES ON THIS TEAM

From the team and dates on Appier's own job board.

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