Principal Machine Learning Engineer, Alt Defense

Principal Machine Learning Engineer, Alt Defense

You will:

• Lead the technical vision for alternate account detection platform, moving from reactive measures to proactive, near real-time prevention.
• Architect high-scale ML systems using Graph Neural Networks (GNNs) and advanced clustering techniques to map relationships across billions of entities.
• Solve complex ground truth and training data challenges for adversarial usecases
• Build for latency and scale, ensuring that detection happens within minutes of a bad actor’s attempt to rejoin the platform.
• Develop innovative adversarial approaches to stay ahead of sophisticated actors who use evolving techniques to mask their identity.
• Drive the ML roadmap, identifying opportunities to leverage big data and behavioral signals to improve precision and recall in a high-stakes environment.
• Mentor and up-level a pod of high-performing ML and software engineers, fostering a culture of technical excellence and rapid iteration.

You have:

• MS or PhD degree in Computer Science, Machine Learning, or a related field.
• 10+ years of industry experience in Applied ML, with a significant focus on anti-abuse, fraud, integrity, or identity.
• Expertise in Graph Learning:
  Deep experience with Large-scale GNNs (GraphSAGE, PGB, etc.) and unsupervised/semi-supervised clustering at the scale of billions of nodes.
• Proven track record of leading complex technical projects from conception to production-level deployment.
• Experience with high-throughput systems:
  You understand the nuances of deploying ML models in low-latency environments where "time-to-detect" is a critical KPI.
• Adversarial mindset:
  You can think like a bad actor to anticipate how they will circumvent detection and build robust defenses against it.

You are:

• Resourceful:
  You're adaptable in any situation and can always find a path forward in the face of evolving threats.
• Analytical:
  Excited to investigate large, ambiguous datasets to find the "signal in the noise" of billions of accounts.
• User Oriented:
  You understand that safety measures must be balanced with a seamless experience for our legitimate community members.
• Team Oriented:
  You are a sought-after mentor who lifts up your peers and builds a collaborative, high-performance environment.
• Mission Oriented:
  You are laser-focused on keeping Roblox safe and are willing to take bold, strategic risks to achieve a billion-user scale safely.

Annual Salary Range

$295,250 — $345,040 USD

Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted).

Roblox provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Roblox also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process.

For US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.