Moloco

Machine Learning Engineer Intern (3-month Internship)

Seoul, Korea
Level
Intern

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

Open. First seen 26 October 2026.

Apply on the company's site →

About the role

Moloco's standard text

About Moloco:

Moloco is an AI-native performance advertising company, bringing the power of AI advertising to the open internet. Founded in 2013 by machine learning engineers who had built AI advertising systems inside the world's largest technology companies, Moloco began from a shared mission: to build that same engine for the open internet.

Today, Moloco is one company with two businesses, built on the same compound AI system. Moloco Ads is our AI-native performance advertising platform, helping mobile app marketers acquire, retain, and re-engage high-value users across the open internet. Moloco Commerce Media is our AI-native retail media platform, enabling retailers and marketplaces to turn their platforms into thriving ad businesses. Both are powered by CARA (Compound Ad Recommendation Architecture), the AI system behind every Moloco product.

At Moloco, we bring together those who've already solved hard problems and those with the drive to. Here, we work on some of the complex problems in AI advertising, at a scale and level of sophistication very few companies can offer. Come build what's next.

The Impact You’ll Be Contributing to Moloco:

  • We are seeking exceptional Machine Learning intern to join us in building a state-of-the-art machine learning system. MOLOCO's programmatic advertising engine is powered by custom deep neural network models that handle 1M+ QPS at 7 ms prediction latencies.
  • MOLOCO is an engineering company founded by software engineers, and machine learning is the core of MOLOCO's engineering systems. We understand the value of a strong engineering team and strive to hire only the best software engineers as seen here (https://www.linkedin.com/company/moloco/people/). Check out our case study published by Google https://cloud.google.com/customers/moloco/

The Opportunity:

  • We are looking for interns who can contribute to ML Modeling: Conduct experiments on state-of-the-art machine learning models for real-world, large-scale problems, including model architecture design, feature engineering, and performance optimization.
  • We are looking for interns who can contribute to ML Infra: Enhance the infrastructure that powers large-scale ML experimentation, training, and serving. This includes TPU/GPU-based model training, microservices for ML inference, scalable data pipelines (Spark / Apache Beam), and systems for ML data validation and monitoring.
Moloco's standard text

How Do I Know if the Role is Right For Me?

  • Major in Computer Science, Statistics or related fields.
  • Strong mathematical skills in probability, statistics, and machine learning.
  • Strong algorithms and data structure skills.
  • Fluent with at least one programming language including Python, Java, and Golang.
  • Fluent in speaking and writing both Korean and English

This is a full-time internship running from January 2027 to April 2027, based in Seoul. We are looking for candidates with two or fewer semesters remaining before graduation as of the internship start date, as well as recent graduates.

Moloco's standard text

Supporting Your Best Work and Your Best Life:

Our benefits are designed to support our people in doing their best work and living well, at work and beyond. Benefits vary by country, employment type, and eligibility. Connect with a recruiter to learn more about benefits in your region.

Moloco Values:

  • Lead with Humility: Everyone’s voice is respected, valued, and heard. We win, lose, and learn together. Accountability and feedback are essential to our success.
  • Uncapped Growth Mindset: We see all situations as opportunities to learn, grow, and improve as individuals and as an organization. We seek diverse perspectives, encourage curiosity, and promote experimentation to push the boundaries of what’s possible.
  • Create Real Value: We pursue the most impactful opportunities with intensity and rigor. We take intelligent risks and make disciplined trade-offs to maintain deep focus. We help our customers win by delivering durable value.
  • Go Further Together: We’re one team working towards one vision. We collaborate proactively and inclusively, involving the right people at the right time and in the right way. We strive to create a more equitable workplace. We won’t let each other fail.

Additional Resources:

  • Moloco Company Blog
  • Moloco Leadership
  • Moloco Newsroom

AI Use in Interviews

Our interview process is designed to get to know the real you. Unless a round specifically includes AI as part of what's being assessed, we ask that candidates engage without AI assistance. Please review our AI Use in Interviews Policy before your interview to understand what to expect. Failure to comply with this policy may impact your candidacy.

Candidate Privacy Notice:

Your privacy matters to us. By applying, you acknowledge that you’ve reviewed our Candidate Privacy Notice.

What this role asks for

Particular to this role

Microservices

Rare in Moloco's other 24 open postings.

Standard for data science / ML roles

Python

Common in data science / ML postings at any company.

In most of Moloco's ads

Machine Learning

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

36% of this description is written for the role. The rest is Moloco's standard text, folded away below.

Compared with Moloco's other open jobs.

The team: Ads Quality HIRES STEADILY

This role is one of 3 open in Ads Quality. 1 was posted in the last 30 days and the oldest in November: a team that hires all year rather than one being built.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

Machine Learning (3 of 3), Golang (2 of 3), Java (2 of 3), Python (2 of 3), Spark (2 of 3)

OTHER ROLES ON THIS TEAM

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

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