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Reddit

Senior Machine Learning Engineer, Ads Optimization

Reddit · Remote - United States

Posted about 3 months ago

or apply directly on Reddit's site. We never take the application ourselves.

Is this posting real?

This role has been open
88 days
Reddit's roles stay open a median of 88 days
Reposted
No
Salary listed
No
0% of Reddit's roles list one
Ghost-job risk at Reddit
high
150 stale, 3 reposted of 150 open
Hiring momentum
259 roles opened in the last 90 days
↑ up vs. the prior 90 days
Last confirmed on the employer's board
2026-10-30

Measured from postings appearing on and disappearing from Reddit's own greenhouse board since 2026-08-03. Full hiring picture for Reddit.

About this role

In this role, you will develop and manage machine learning models that help advertisers on Reddit forecast campaign outcomes based on various factors such as budget and audience. You will take ownership of projects from conception through deployment, collaborating with cross-functional teams to enhance model accuracy and provide actionable insights for advertisers. The position involves hands-on work with production systems and requires a strong understanding of statistical learning and predictive modeling.

Our read on this posting2.8out of 5
benefits
4/5
freshness
1/5
career value
5/5
role clarity
4/5
pay transparency
0/5

Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of Reddit as an employer.

What you need

  • Experience independently designing, shipping, and improving predictive ML systems in advertising, marketplaces, recommendations, search, forecasting, or similarly complex domains.
  • Strong foundations in statistical learning, probability, and optimization, with experience working with large-scale behavioral or transactional data.
  • Practical experience in at least one relevant area, such as forecasting, response prediction, probabilistic modeling, multitask learning, or transfer learning.
  • Sound evaluation judgment, including temporal validation, segment-level analysis, and an understanding of calibration, uncertainty, and the limits of predictions under changed conditions.
  • Experience diagnosing and addressing modeling challenges such as sparse observations, cold start, seasonality, distribution shift, selection bias, or delayed labels.
  • Strong programming and software engineering skills, including experience building and operating production ML pipelines and services.

Nice to have

  • Experience in demand, supply, and inventory forecasting including time-series methods, hierarchical or global models, and multi-horizon prediction.
  • Experience in auction and investment modeling including auction simulation or replay, win-rate and price prediction, bid/budget response curves, or constrained optimization.
  • Experience in scenario evaluation including counterfactual or off-policy evaluation, sensitivity analysis, uncertainty propagation, or combining predictive models to estimate campaign outcomes.
  • Experience in reach and audience estimation including population and overlap estimation, reach/frequency models, sampling correction, or saturation modeling.
  • Experience in probabilistic and response modeling including quantile or distributional prediction, calibrated conversion/value prediction, or delayed-feedback modeling.

What you get

  • Comprehensive Healthcare Benefits and Income Replacement Programs
  • 401k with Employer Match
  • Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support
  • Family Planning Support
  • Gender-Affirming Care
  • Mental Health & Coaching Benefits

Worth weighing

  • No specific technologies or programming languages mentioned, which could affect clarity on technical requirements.
  • The role involves significant collaboration across teams, which may require strong interpersonal skills and adaptability.
  • The salary range is broad, indicating potential variability based on experience and negotiation.

Summarised from Reddit's posting. Read the full original.

Listed by Reddit on their greenhouse job board, last confirmed open on 2026-10-30. PitchMeAI is not the employer.

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