Senior Software Engineer, Build Platform (AI)

Location: San Mateo, California, United States. Office-based roles are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday.

Annual base salary: $196,750–$243,290 USD. Full-time employees are also eligible for equity compensation and benefits.

Company

Roblox builds tools and platforms for a global community creating, playing, learning, and connecting through 3D immersive digital experiences.

What you will do

• Design, build, and operate agent-platform services for orchestration, session management, model routing, and tool and skill execution.
• Improve the reliability, latency, and cost of multi-step agent workflows in production.
• Build and extend evaluation infrastructure to measure quality and detect regressions before release.
• Partner with Build product teams, ML infrastructure, and Safety to ship capabilities safely.
• Participate in on-call and improve operational excellence.
• Write technical specifications, review code, and mentor engineers.

Requirements

• 5+ years of experience building and operating backend or distributed systems in production.
• Proficiency in C#, Java, Go, or a similar programming language.
• Experience with cloud infrastructure, containerized services, and workflow or job orchestration systems such as Temporal or Kubernetes.
• Experience owning services end-to-end, including design, launch, monitoring, and incident response.
• BS in Computer Science or a related field, or equivalent professional experience.
• For this U.S.-based role, employment may be unavailable for candidates whose United States work authorization is tied to certain U.S. visa categories.

Nice to have

• Experience building with LLM APIs, agent frameworks, or evaluation pipelines.
• Curiosity about LLMs and agentic systems and how they behave in production.
• Pragmatic, iterative delivery guided by data and evaluations.

Culture & Benefits

• Work on systems supporting AI-driven creation for millions of creators.
• Full-time employees are eligible for equity compensation and benefits.
• Roles based in an office follow a hybrid attendance pattern with onsite work Tuesday through Thursday and optional presence Monday and Friday.
• Roblox provides equal employment opportunities and reasonable accommodations during recruiting for qualifying disabilities or religious beliefs.