Senior Software Engineer

About the Role

Join the Ads Experimentation Platform (AEXP) team, working remotely from Ontario, Canada, to build critical tools that enable engineers and scientists to accurately test new products and efficiently verify innovative ideas within Reddit's dynamic ads marketplace. This role offers the chance to tackle complex, high-impact problems related to experimentation, data analysis, and algorithmic exploration.

Responsibilities

• Design, develop, and maintain scalable experimentation platforms and tools for the ads marketplace.
• Solve challenging problems related to A/B testing, statistical significance, and causal inference in a high-volume data environment.
• Collaborate with product and engineering teams to integrate experimentation capabilities and support Ads Pacing mechanisms.
• Drive the technical direction and implementation of features that enable scientific decision-making and product iteration.

Requirements

• 5+ years of experience in software development, with a focus on backend or data platform engineering.
• Proven experience designing and building scalable, high-performance distributed systems.
• Strong understanding of experimentation methodologies, including A/B testing, statistical analysis, and causal inference.
• Proficiency in at least one modern programming language (e.g., Python, Java, Scala, Go).
• Experience with large-scale data processing, analytics, and event-driven architectures.
• Excellent problem-solving skills and the ability to tackle complex technical challenges.

Nice-to-Haves

• Experience in the advertising technology (AdTech) domain.
• Familiarity with specific challenges like budget cannibalization, sparse data analysis, or multi-armed bandits.
• Experience with cloud platforms (e.g., AWS, GCP, Azure) and containerization technologies.

About the Team

The Ads Experimentation Platform (AEXP) team is crucial to Reddit's mission of building a massive advertising business. We provide the foundational tools that enable data-driven product development and decision-making across the ads marketplace, directly impacting revenue generation and user experience. We deal with unique challenges in a dynamic environment where millions of engagements occur every second.