Machine Learning Engineer, Reddit

• We are seeking a highly skilled engineer to take a critical role in building state-of-the-art bidding optimization systems
• 3+ years of contributing high-quality code to production systems that operate at scale
• 3+ years of experience building control systems, PID controllers, multi-armed bandits, reinforcement learning algorithms, or bid/pricing optimization systems
• Experience working with streamed and real time data
• Experienced partnering with both technical and non-technical stakeholders
• Experience working in online marketplaces or the ads domain is a plus

• The Advertiser Budget Optimization team builds ad campaign optimizations that enable advertisers to efficiently capture user engagement while minimizing their costs
• The team leverages machine learning models to incorporate advertisers off-site goals in auction ranking, allowing them to maximize installs, key conversions, or return on ad spend
• As the primary owners of the budget pacing system, the team is responsible for a central part of the ads delivery system that delivers advertisers budgets smoothly and completely throughout the day
• Given the centrality of this system, the team also regularly conducts highly rigorous and controlled experiments in order to measure the impact of improvements to these systems
• A bid-based budget pacing system that delivers campaigns’ budgets throughout the day
• Campaign level budget optimization that optimally allocates budgets across ad groups to maximize advertiser value
• Average Daily Budgets that deliver smooth spend across a weekly period with low variance
• The Lowest Cost campaign optimization, which simplifies advertisers’ experiences by automating campaign bids
• As a machine learning engineer in the Ads Budget Optimization team, you will work closely with technical leaders to implement sophisticated optimization systems
• You are responsible for contributing to a technical design, working across the ad serving stack to create new functionality with urgency and care, and ensuring that codebases are healthy and maintainable in the long-term
• You will collaborate with cross-functional engineering, product, and marketing teams to ensure that our customers’ voices are represented in your work
• You will design, conduct, and analyze experiments to quantify the impact of the systems that you build
• You will serve as a key contributor to some of the most impactful monetization systems at Reddit
• Building Reddit-scale optimizations to improve advertiser outcomes using cutting-edge techniques in the industry
• Leverage live auction data and model predictions to adjust campaign bids in real time
• Incorporate knowledge of the Reddit ads marketplace into budget pacing algorithms powered by control & reinforcement learning systems
• Design and conduct rigorous A/B experiments to evaluate the business impact of new bid & budget optimization algorithms
• Writing maintainable code and conducting rigorous analyses
• Contribute data-driven insight to projects in your space. We give everyone a seat at the table and

• Paid volunteer time off
• 4+ months paid parental leave
• Personal and professional development stipend
• Work from home opportunities
• Health insurance

Total funding: $1.2bn

Reddit is a website that facilitates thousands of message board communities, known as subreddits, with an aim to promote authentic human connection. There are more than 100,000 communities on Reddit, covering everything, from food, entertainment, sports, and books, to more niche topics that cater for very specific audiences.