Principal Machine Learning Engineer, Ads Measurement

Reddit, Inc.; San Francisco (CA); On-site; USD 266,000 - 373,000; Full time

Job summary

An innovative firm is seeking a Principal Machine Learning Engineer to lead their Ads Measurement initiatives. This role involves driving the technical strategy for identity resolution systems, collaborating with cross-functional teams, and mentoring junior engineers. You will play a crucial role in optimizing ML workflows and ensuring compliance with privacy standards. This position offers a dynamic environment where your expertise will directly influence the efficiency of the advertising platform. If you are passionate about machine learning and want to make a significant impact, this is the opportunity for you.

Benefits

Comprehensive Healthcare Benefits

401k Match

Family Planning Support

Mental Health & Coaching Benefits

Flexible Vacation

Paid Volunteer Time Off

Qualifications

• 10+ years of software engineering experience with focus on ML-driven systems.
• Experience in architecting identity graphs and device graphs.
• Proficiency in ML frameworks and large-scale data processing.

Responsibilities

• Lead technical strategy for identity resolution systems ensuring accuracy and scalability.
• Oversee ML workflows from data ingestion to model deployment.
• Establish best practices and mentor junior engineers.

Skills

Machine Learning

Identity Resolution

Graph-based Systems

TensorFlow

PyTorch

Data Processing

Distributed Computing

Technical Leadership

Communication Skills

Education

Bachelor's Degree in Computer Science or related field

Master's Degree in Machine Learning or related field

Tools

Spark

Kafka

Beam

Flink

Job description

Principal Machine Learning Engineer, Ads Measurement

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 101M+ daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit redditinc.com .

The Ads Measurement Org is dedicated to enhancing the efficiency and user-friendliness of our advertising platform. We specialize in privacy enhancing technologies, identity resolution, and modeled conversions.

We’re looking for a hands-on Principal Machine Learning Engineer with deep expertise in identity resolution and graph-based systems, who can lead end-to-end Ads initiatives across engineering and cross-functional teams. You will drive architectural decisions, mentor your peers, and dive into technical challenges directly when the team needs it. Our diverse group of engineers, product managers, data scientists, and ads specialists is excited to welcome you on board!

Minimum Qualifications:

• 10+ years of professional software engineering experience, with at least 5+ years focused on ML-driven systems at scale
• Demonstrated experience architecting and building identity graphs, device graphs, or similar identity matching solutions leveraging probabilistic techniques
• 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)
• 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 our company’s identity resolution system, ensuring accuracy, scalability, and compliance with privacy requirements
• 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 graph
• Mentor and coach junior engineers, fostering a culture of innovation, technical excellence, and knowledge sharing across the organization
• Comprehensive Healthcare Benefits and Income Replacement Programs
• 401k Match
• Family Planning Support
• Mental Health & Coaching Benefits
• Flexible Vacation & Reddit Global Days off
• Paid Volunteer time off

Pay Transparency:

This job posting may span more than one career level.

In addition to base salary, this job is eligible to receive equity in the form of restricted stock units, and depending on the position offered, it may also be eligible to receive a commission. Additionally, Reddit offers a wide range of benefits to U.S.-based employees, including medical, dental, and vision insurance, 401(k) program with employer match, generous time off for vacation, and parental leave. To learn more, please visit https://www.redditinc.com/careers/ .

To provide greater transparency to candidates, we share base pay ranges for all US-based job postings regardless of state. We set standard base pay ranges for all roles based on function, level, and country location, benchmarked against similar stage growth companies. Final offer amounts are determined by multiple factors including, skills, depth of work experience and relevant licenses/credentials, and may vary from the amounts listed below.

The base pay range for this position is:

$266,000 - $372,400 USD

Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve. Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.

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