Staff Machine Learning Engineer - Ads Measurement

Position Overview

Reddit's Ads Measurement Org is dedicated to enhancing the efficiency and intelligence of Reddit’s advertising platform. We specialize in privacy-enhancing technologies, probabilistic user matching, and modeled conversions to enable measurement and delivery in a privacy-conscious world. We are seeking a hands-on Staff Machine Learning Engineer with deep expertise in probabilistic modeling and user matching to lead end-to-end Ads initiatives across engineering and cross-functional teams. You will drive architectural decisions, mentor peers, and dive into complex technical challenges.

Requirements

• Experience:
  • 8+ years of professional software engineering experience.
  • At least 3+ years focused on ML-driven systems at scale.
  • Demonstrated experience architecting and building identity resolution, device graphs, or similar identity matching solutions leveraging probabilistic techniques.
• Technical Skills:
  • Strong knowledge of various identifiers (cookies, hashed emails, phone numbers, IP addresses, user agents) and their use in identity resolution.
  • Proficiency in machine learning frameworks (e.g., TensorFlow, PyTorch) and libraries for feature engineering, model training, and inference.
  • Solid understanding of large-scale data processing, distributed computing, and data infrastructure (e.g., Spark, Kafka, Beam, Flink).
• Leadership & Collaboration:
  • Proven technical leadership in cross-functional settings, driving architectural decisions and influencing stakeholders (product, data science, privacy, legal).
  • Excellent communication, mentoring, and collaboration skills to align teams on a long-term vision for identity resolution.

Responsibilities

• Lead the technical strategy and architecture for Reddit's identity resolution system, ensuring accuracy, scalability, and compliance with privacy requirements.
• Develop and refine ML models for probabilistic user matching using multiple identifiers (cookies, IP addresses, hashed emails, phone numbers, user agents).
• Oversee end-to-end ML workflows—from data ingestion and feature engineering to model training, evaluation, and deployment—optimizing for performance and cost.
• Partner with cross-functional teams (e.g., product management, data science, platform engineering, privacy, legal) to define the roadmap and set long-term goals.
• Establish engineering best practices, code quality standards, and data governance guidelines to ensure maintainability and trustworthiness of the identity resolution system.
• Mentor and coach junior engineers, fostering a culture of innovation, technical excellence, and knowledge sharing across the organization.

Company Information

Reddit is a community of communities, built on shared interests, passion, and trust. It's 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 101M+ daily active unique visitors, Reddit is one of the internet’s largest sources of information.

What We Offer

• A dynamic, supportive work environment with a diverse team of engineers and cross-functional partners.
• Opportunities for professional growth and development, with a focus on continuous learning and skill-building.
• A competitive salary and benefits package, with a focus on work-life balance and employee well-being.
• Flexible work arrangements, including remote work options, to support your individual needs and preferences.
• The chance to work on high-impact projects that drive real results for our users and advertisers.

Benefits

• Comprehensive Healthcare Benefits and Income...

Application Instructions

If you're a talented software engineer looking for a new challenge, and you're passionate about building scalable, reliable products, we encourage you to apply for this exciting opportunity!