aimlroles

Senior Machine Learning Scientist (ROAS) - Tokyo

Appier appier.com Open · verified Oct 22, 2026
Tokyo Senior AI Research

At a glance

Senior AI Research role at Appier. Tokyo.

Pay not stated AI Research salary

RoleAI Research
SenioritySenior
LocationTokyo
PostedJan 8, 2026 · 9mo ago
Role brief

aimlroles summary, based on the employer's posting.

What you'll do

  • Build identity graphs and identify high-value users with machine learning to improve return on ad spend
  • Run online experiments and use the results to improve campaign return on ad spend
  • Lead your project independently, coordinating with product, backend and frontend partners on customer measurement solutions

What you bring

  • A master’s or doctoral degree in computer science, machine learning, statistics or a related subject
  • At least three years working on identity graphs, ID matching or cross-device mapping for digital advertising
  • Experience creating mappings and profiles from large-scale data, with Python, SQL and a modern machine learning framework

Who this fits

This senior individual-contributor role suits someone who can lead project work independently and collaborate with product and engineering partners. It is based in Tokyo.

From the employer

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.