[2026] Senior Machine Learning Engineer, Recommendation Systems - PhD Early Career

Roblox
San Mateo
Workplace: OnsiteFull timeUSD 195,780 - 242,100 annuallyFunction: Data Science & Machine LearningEducation: phdSkills: ["Communication","Problem-solving","Team collaboration"]

Senior ML engineer focused on building large-scale recommender systems at Roblox, combining deep learning, generative AI, and reinforcement learning to improve ranking, retrieval, and personalization across platforms. You will design production-ready ML solutions, collaborate with researchers and engineers, and translate research into scalable systems impacting hundreds of millions of daily users.

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FursaFursa
Roblox
Roblox
10 months ago

[2026] Senior Machine Learning Engineer, Recommendation Systems - PhD Early Career

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Source: Company careers pageValidated by: Fursa AI
Last checked: 10 hours agoStatus: Live

Job Summary

Senior ML engineer focused on building large-scale recommender systems at Roblox, combining deep learning, generative AI, and reinforcement learning to improve ranking, retrieval, and personalization across platforms. You will design production-ready ML solutions, collaborate with researchers and engineers, and translate research into scalable systems impacting hundreds of millions of daily users.
Location: San Mateo
Workplace: Onsite
Employment Type: Full time
Job Function: Data Science & Machine Learning
Seniority: Sr. Manager level

Key Responsibilities

  • •Design and implement large-scale recommendation systems that power discovery across Roblox’s surfaces — experiences, avatars, and creator content.
  • •Develop deep learning models for ranking, retrieval, and personalization using approaches in multimodal models, LLMs, and generative AI.
  • •Collaborate with applied researchers, engineers, and product teams to advance experimentation and accelerate innovation.
  • •Translate research into production systems that impact hundreds of millions of daily active users.
  • •Work backward from user and product needs to deliver ML solutions that drive engagement, retention, and ecosystem growth.

Pay and Benefits

Salary: USD 195,780 - 242,100 annually
Equity and Bonus:Equity

Key Requirements

  • •Possessing or pursuing a PhD in computer science, engineering, or a related field, with a thesis aligned to Roblox’s research areas.
  • •Expertise in one or more areas: recommender systems, search systems, information retrieval, or generative models (e.g., LLMs, VLMs, VLAs)
  • •Ability to design and architect systems for efficient personalization and user interest modeling using advanced attention mechanisms (e.g., sparse/linear attention)
  • •A strong research track record, evidenced by multiple publications and presentations in top-tier, peer-reviewed venues (e.g., SIGIR, KDD, RecSys, ICLR, ICML, NeurIPS)
  • •Proficiency in one or more programming languages (e.g., Python, C++, Go, Java) and experience building and optimizing large-scale systems.
Experience:Recommender systemsInformation retrievalMultimodal modelsGenerative models
Education:PhD / Doctorate
Skills:CommunicationProblem-solvingTeam collaboration
Languages:English
Tech Stack:PythonC++GoJavaDeep learningLLMsMultimodal modelsGenerative AI

Company Brief

Roblox
Operates an online platform for user-generated games and virtual experiences, enabling creators to build, publish, and monetize interactive 3D experiences for a global community of players.
Industry: Gaming
Company Size: Enterprise (1,001+ employees)
Revenue: USD 1B+
Growth: Public Company
Valuation: Public Company (Market Cap in USD)
Funding: IPO / Publicly Listed
Headquarters: San Mateo, United States
Founded: 2004
WebsiteLinkedIn