{"id":1653659,"url":"https://alion.io/job/reddit-staff-machine-learning-engineer-ads-ml-efficiency","title":"Staff Machine Learning Engineer, Ads ML Efficiency","company":{"id":16,"name":"Reddit","domain":"reddit.com","url":"https://alion.io/company/reddit","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":79,"open_postings":14,"ghost_share":0,"stale_share":0.643,"repost_share":0,"time_to_fill_p50_days":71,"computed_at":"2026-10-03T05:45:00Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"staff","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":[],"countries":[],"hiring_countries":["US","CA"],"hiring_countries_total":2,"salary":{"min":230000,"max":322000,"currency":"USD","period":"year","gross":null,"usd_annual":322000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"C++","optional":false},{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"Machine Learning","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false},{"name":"PyTorch C++","optional":false},{"name":"Ray","optional":false},{"name":"Rust","optional":false},{"name":"Spark","optional":false},{"name":"TensorFlow","optional":false},{"name":"TensorFlow C++","optional":false}],"status":"live","first_seen_at":"2026-10-01T17:48:26Z","employer_posted_date":"2026-10-01","last_verified_at":"2026-10-04T02:26:53Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"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 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com.\nLocation: Reddit has a flexible first workforce. Don't live near our office? No worries: you can work remotely from anywhere in the US or Canada.\nAbout the Team\nThe ML Efficiency team builds the infrastructure, tooling, and optimization systems that enable machine learning engineers and researchers to train, evaluate, deploy, and operate models efficiently at scale. We focus on improving developer productivity, reducing infrastructure costs, increasing hardware utilization, and accelerating experimentation across the company’s ML ecosystem.\nResponsibilities\nDesign and build systems that improve the efficiency of ML training and inference workloads.\nDevelop tooling that helps ML engineers debug, profile, optimize, and monitor model performance.\nImprove GPU and general resource utilization through scheduling, resource management, caching, and workload optimization.\nPartner with ML researchers and product teams to identify bottlenecks and drive performance improvements.\nBuild benchmarking frameworks and performance dashboards for training and serving systems.\nOptimize distributed training infrastructure, data pipelines, and model serving architectures.\nLead cross-functional initiatives that improve the productivity of Reddit ML engineers.\nDrive technical strategy for ML platform scalability, reliability, and cost efficiency.\nQualifications\nRequired\nBS, MS, or PhD in Computer Science or a related field.\n5+ years of software engineering experience.\nStrong proficiency in Python\nProfiency in at least one systems language (Go, C++, Rust, or Java) preferred\nExperience building distributed systems at scale.\nExperience with machine learning infrastructure, training systems, or model serving platforms.\nDeep understanding of performance engineering and systems optimization.\nStrong debugging and profiling skills.\nPreferred\nExperience with large-scale recommendation, ranking, generative AI, or foundation model systems.\nExperience with distributed training frameworks such as PyTorch Distributed, Ray, Tensorflow, Spark\nFamiliarity with GPU architectures and performance analysis tools.\nExperience optimizing cloud infrastructure costs across large ML workloads.\nContributions to internal platforms used by multiple ML teams.\nExperience with building real time ML inference applications\nWhat Success Looks Like\nML engineers can move from idea to experiment faster.\nTraining and inference costs decrease, performance increases, while model quality is maintained or improved.\nGPU utilization and cluster efficiency increase.\nPlatform reliability improves as ML workloads scale.\nTeams spend less time managing infrastructure and more time building models.\nAverage recommendation model size increases.\nBenefits:\nGlobal Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support\nFamily Planning Support\nGender-Affirming Care\nMental Health & Coaching Benefits\nGroup Personal Pension Scheme with Employer match\nPrivate Medical and Dental Scheme\nIncome Replacement Programs\nBike to Work scheme\nFlexible Vacation & Paid Volunteer Time Off\nGenerous Paid Parental Leave\nPay Transparency:\nThis job posting may span more than one career level.\nIn 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/.\nTo provide greater transparency to candidates, we share base salary 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.\nThe base salary range for this position is:\n$230,000—$322,000 USD\nIn select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording, transcription and summarization prior to any scheduled interviews.\nDuring the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable. We will not sell your personal information or disclose it to any third party for their marketing purposes. We will delete any recording of your interview promptly after making a hiring decision. For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors.\nReddit 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. 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