Principal Software Engineer, Build Platform — AI at Scale

SportsTechJobs; San Mateo (CA); On-site; USD 345,000 - 399,000; Full time

Job summary

Roblox is seeking a Principal Software Engineer for the Build Platform in San Mateo, CA. You will shape the architecture behind AI-powered creation, oversee long-running workflows, model routing, tool and skill execution, and the safety, cost, and observability aspects of the platform.

You will lead with hands-on technical leadership, drive collaboration across teams, and define scalable systems for millions of creators. The role is based at Roblox HQ in San Mateo with onsite work requirements.

Qualifications

• 8+ years of experience building and operating large-scale distributed systems.
• Deep experience designing backend platforms used by other engineering teams.
• Hands-on experience with production AI/ML systems, such as model serving, orchestration, or AI agent loops.

Responsibilities

• Own the technical architecture and long-term roadmap for the Build agent platform.
• Design for reliability, safety, observability, and cost efficiency in production AI workloads.
• Define metrics to evaluate agent quality and build the evaluation infrastructure.

Skills

Distributed systems leadership

Backend platform design

Production AI/ML

Workflow engines

Education

BS in Computer Science or related field

Tools

Temporal

Job description

Roblox is seeking a Principal Software Engineer for the Build Platform in San Mateo, CA. You will shape the architecture behind AI-powered creation, oversee long-running workflows, model routing, tool and skill execution, and the safety, cost, and observability aspects of the platform.

You will lead with hands-on technical leadership, drive collaboration across teams, and define scalable systems for millions of creators. The role is based at Roblox HQ in San Mateo with onsite work requirements.