Software Engineer, Ads

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Team Description

Reddit is poised to rapidly innovate and grow like no other time in its history. We’re currently hiring across multiple teams, some of these teams include:

Ads ML Serving Team
The Ads ML Serving team is part of Reddit’s Ads ML Platform, which builds the infrastructure and tools that power machine learning across Ads. This team focuses on creating a highly reliable, scalable, and efficient ML serving stack. Their work includes evolving long-term serving architecture, integrating closely with the ads serving stack, optimizing CPU/GPU performance, and building model velocity tools like observability libraries and model quality gating.

Attribution & Identity Team
The Attribution & Identity team builds products that help advertisers understand and measure the impact of their campaigns. They focus on attribution systems, identity solutions, and advertiser experimentation tools that improve performance insights and usability. Their goal is to make Reddit’s advertising platform more effective, transparent, and data-driven.

Ads Growth Team
The Ads Growth team drives initiatives to expand Reddit’s advertiser base, with a focus on Small to Medium Businesses (SMBs). We build and scale the technical foundation for key product pillars that enable SMB advertisers to succeed on Reddit. Our work spans collaboration with product, design, marketing, data science, UX, and sales teams to deliver measurable business outcomes.
We prioritize iterative development, rapid shipping, rigorous testing, and building capabilities that create step-change growth. Our goal is to multiply the number of monthly active advertisers by delivering impactful tools, features, and experiences tailored to the needs of SMBs.

Business Manager
The Business Manager team stands out for its genuinely inclusive and collaborative culture, where not only is open feedback central, but every opinion and idea is truly valued and given space to shape our direction. Here, diverse perspectives are seen as a core strength, fostering a team dynamic where everyone feels empowered to contribute and innovate. On a day-to-day basis, engineers tackle complex, high-stakes challenges at the core of Reddit’s ads platform which include innovating on permissions systems, building Agency and Large Enterprise solutions, and driving adoption among Reddit's largest advertisers. From ideation to delivery, our engineers are trusted with end-to-end ownership of their projects, working closely in cross-functional collaboration with PMs, UX, and partner teams. This hands-on approach means every team member plays a direct and visible role in delivering high-impact, user-focused solutions for some of Reddit’s most strategic advertisers.

Role Description:

This is a generalist mid-level backend position within the Ads Organization. Ads is the fuel that powers Reddit’s mission. As a backend engineer on the team, candidates might work on:

• Microservices and APIs that power our advertiser-facing product, ads.reddit.com
• Distributed systems that ensure the right ad gets shown to the right user at the right time
• Backends that power interactive user experiences on our ads like Polls and Games
• Real time, data intensive systems that measure the performance of our ad campaigns
• Infrastructure that supports all of the above

Technologies used on the team include:

• Languages: Go, Python, Scala
• Frameworks: Spark, Thrift, Baseplate, Kafka
• Datastores: Postgres, BigQuery, Redis, Druid 
• Tools: Kubernetes, Argo, Docker

Mid-level engineers are expected to absorb best practices and learn exceptionally quickly while being effective core contributors. Engineers at this level must be able to code independently, but may work with senior engineers on the design of complex solutions. The most important skills an engineer at this level must possess are 1) coachability and an eagerness to grow, 2) deep passion for coding, and 3) excellent independent learning skills, all while operating as a fully functioning member of an engineering team.

Responsibilities:

• Work with product managers to design and implement Ads products.
• Collaborate closely with the platform and data teams while building new features.
• Lead the processes needed to improve operational stability, including improving code quality, delivering dashboards and data visualizations.
• Build extensible components that would align with the product objectives. 
• Support day to day project management tasks including communicating project updates, managing project timelines and overseeing project execution.  

Required Qualifications:

• 3+ years of software development experience in one or more general purpose programming languages (Java, Scala, Go, C++, Python).
• Able to take complete ownership of a feature or project.

Bonus Points:

• Experience working in the Ads domain 
• Experience or interest in the advertising business and understanding customer needs

Benefits:

• 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
• Comprehensive Medical Benefits & Health Care Spending Account
• Registered Retirement Savings Plan with matching contributions
• Income Replacement Programs
• Flexible Vacation & Paid Volunteer Time Off
• Generous Paid Parental Leave