Senior Machine Learning Systems Engineer, Ranking Platform

Reddit, Inc.

Senior Software Engineer designing and implementing ML ranking systems for Reddit's personalized content. Collaborating with cross-functional teams to build scalable ML applications.

Posted 6/16/2026full-timeRemote • 🇺🇸 United StatesSenior💰 $216,700 - $303,400 per yearWebsite

Tech Stack

Tools & technologies

CloudDistributed SystemsGoPython

About the role

Key responsibilities & impact

Design and implement the next generation ML ranking system that powers the personalized feeds, search and other products at Reddit
Design and develop ML and Generative AI systems in cloud-based production environments at scale
Partner closely with Product, Infrastructure and Engineering teams and translate requirements into scalable ML systems
Write efficient, scalable and maintainable code that will help us iterate quickly and safely
Champion and drive engineering processes and best practices
Raise the bar for engineering across the team through code reviews, mentorship and knowledge sharing

Requirements

What you’ll need

5+ years of experience as a software engineer developing large-scale distributed systems and data intensive ML based system, using Go, Python, C++ or any object oriented programming language
5+ years of experience with designing and implementing large-scale performant and reliable machine learning systems. Experience with recommendation systems is preferred.
Experience with developing and improving tools such as deployment, automation, system diagnosis, ML monitoring etc.
Strong organizational skills with the ability to prioritize tasks and keep projects on schedule with a strong attention to detail
BS degree in Computer Science, a similar technical field of study or equivalent practical experience
Familiar with software engineering best practices such as unit testing and code reviews, design, and documentation
Entrepreneurial spirit. You are self-directed, innovative, and biased towards action in fast-paced environments. You love to build new things and thrive in ambiguity and even failure
Excellent communication skills. You collaborate effectively with teams in a fully remote environment and discuss complex topics with technical and non-technical audiences

Benefits

Comp & perks

Comprehensive Healthcare Benefits and Income Replacement Programs
401k with Employer Match
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
Flexible Vacation & Paid Volunteer Time Off
Generous Paid Parental Leave

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

machine learningGenerative AIGoPythonC++large-scale distributed systemsrecommendation systemsdeployment toolsautomation toolsML monitoring

Soft Skills

organizational skillsattention to detailcommunication skillscollaborationmentorshipknowledge sharingself-directedinnovativebias towards actionability to thrive in ambiguity

Certifications

BS degree in Computer Science