Machine Learning Engineer Intern (3-month Internship)

Posted Yesterday
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Seoul, KOR
Hybrid
Internship
AdTech • Artificial Intelligence • Machine Learning • Software
Moloco is an AI-native performance advertising company bringing the power of AI advertising to the open internet.
The Role
Three-month Machine Learning Engineer Internship focused on developing state-of-the-art machine learning models and infrastructure for large-scale advertising systems. Responsibilities include model architecture design, feature engineering, performance optimization, TPU/GPU training, ML inference microservices, scalable Spark and Apache Beam data pipelines, and data validation and monitoring. Candidates should have strong foundations in computer science, mathematics, algorithms, and machine learning, plus proficiency in Python, Java, or Golang and fluency in Korean and English.
Summary Generated by Built In

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.
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.

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.

Skills Required

  • Currently majoring in Computer Science, Statistics, or a related field
  • Strong mathematical skills in probability, statistics, and machine learning
  • Strong algorithms and data structures skills
  • Fluency in at least one programming language, including Python, Java, or Golang
  • Fluency in both spoken and written Korean and English
  • Two or fewer semesters remaining before graduation at internship start, or recent graduate status
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The Company
850 Employees
Year Founded: 2013

What We Do

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 built AI advertising systems at some of the world’s largest technology companies, Moloco was created to bring that same level of technology to businesses beyond the major platforms. Today, Moloco is one company with two businesses built on the same compound AI system. Moloco Ads is an AI-native performance advertising platform that helps mobile app marketers acquire, retain, and re-engage high-value users across mobile and connected TV. Moloco Commerce Media helps retailers and marketplaces build and scale their own advertising businesses using first-party data, shopper attention, and AI. Behind every Moloco product is CARA, our Compound Ad Recommendation Architecture, which continuously learns across billions of signals to make advertising decisions in real time. Headquartered in Menlo Park, California, Moloco has more than 850 employees across 13 global offices. Our teams span software engineering, machine learning, applied science, product, design, sales, marketing, customer success, and corporate functions. At Moloco, our business grows when our customers succeed. We combine advanced AI technology with hands-on expertise to help businesses create measurable growth and build for what comes next.

Why Work With Us

At Moloco, you’ll work with a global team solving world-scale problems in AI advertising. We combine deep technical expertise with curiosity, ownership, and collaboration to build frontier technology, create real value for customers, and keep pushing what’s possible.

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