Senior Machine Learning Engineer, Ads Optimization at Reddit

<div class="content-intro"><div class="c-message_kit__blocks c-message_kit__blocks--rich_text"> <div class="c-message__message_blocks c-message__message_blocks--rich_text" data-qa="message-text"> <div class="p-block_kit_renderer" data-qa="block-kit-renderer"> <div class="p-block_kit_renderer__block_wrapper p-block_kit_renderer__block_wrapper--first"> <div class="p-rich_text_block"> <div class="p-rich_text_section">Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit <a class="c-link" href="http://www.redditinc.com/" target="_blank" data-stringify-link="http://redditinc.com" data-sk="tooltip_parent">www.redditinc.com</a>.</div> </div> </div> </div> </div> </div></div><h2>Team Description</h2> <p>This role sits in the <strong>Ads Optimization </strong>organizations, which are responsible for the health and performance of Reddit’s ads marketplace. We focus on:</p> <ul> <li>Designing the <strong>auction and bidding mechanisms</strong> that decide which ads show to which users and at what price.</li> <li>Building <strong>optimization systems</strong> that help advertisers achieve their goals (e.g., conversions, ROAS) under budget and delivery constraints.</li> <li>Ensuring <strong>marketplace quality</strong> by improving user experience with ads, fighting ad blindness, and increasing valuable ad opportunities on the platform.</li> </ul> <p>You’ll join a set of tight-knit engineers working on high-impact, internet-scale problems at the core of Reddit’s revenue engine, collaborating closely with Product, Data Science, and Infra partners across Reddit Ads.<br><br></p> <h2>Role Description</h2> <p>We are hiring <strong>Machine Learning Engineers (IC4)</strong> to build and evolve the <strong>auction, bidding and budgeting</strong> systems that power Reddit Ads.</p> <p>In this role, you will:</p> <ul> <li>Design and implement <strong>optimization algorithms</strong> for auctions, bidding strategies, and pacing that balance advertiser performance, user experience, and marketplace efficiency.</li> <li>Own systems end-to-end: from problem formulation and algorithm design to experimentation, production deployment, and ongoing iteration.</li> <li>Work across <strong>Ads Optimization</strong> (bid strategies, budget optimization, pacing) to deliver measurable wins for advertisers and Redditors.</li> </ul> <p>We are hiring a Senior (IC4)  level:</p> <ul> <li><strong>IC4</strong> MLEs lead more complex or multi-quarter initiatives, set technical direction for key parts of the bidding/auction/pacing stack, and mentor other engineers while remaining hands-on.</li> </ul> <h2>Responsibilities</h2> <h3>Auction, Bidding, and Pacing Systems</h3> <ul> <li>Design and implement models and policies that:</li> <ul> <li>Compute bids for different optimization objectives (e.g., CPC, CPA, ROAS-based strategies).</li> <li>Pace budgets smoothly over time across accounts, campaigns, and ad groups while preventing overspend or underspend.</li> <li>Allocate spend and auction participation intelligently across segments, surfaces, and time zones.</li> </ul> <li>Translate product and marketplace goals into concrete optimization problems and constraints (e.g., ROI, revenue, delivery smoothness, fairness, and user experience).</li> </ul> <h2>Required Qualifications</h2> <p><em>(Level will be determined during the interview process; IC4 expectations assume deeper experience and broader scope.)</em></p> <ul> <li><strong>3–5+ years</strong> of experience building, deploying, and operating machine learning systems in production (for IC4, typically 5+ years).</li> <li>Strong programming skills in <strong>Python</strong>, <strong>Java</strong>, <strong>Go</strong>, or similar languages, with solid software engineering fundamentals.</li> <li>Experience designing scalable data processing systems (e.g

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