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Principal Software Engineer, Build Platform
Roblox · San Mateo, CA · Posted today
Set the architecture for Roblox's AI agent platform that lets anyone build games from a description, scaling the agent harness, evals, and cost systems to millions of creators.
As a Principal Software Engineer on the Build Platform team, you will set the technical direction for the infrastructure behind AI-powered creation on Roblox. Build lets anyone make a game by describing it, on mobile and in Studio. Our team owns the platform underneath: the cloud-hosted agent harness, tools and skills, and evaluation framework. You'll be the senior technical leader shaping its architecture.
This role spans the full agent stack: orchestrating long-running, multi-step workflows; model integration and routing across providers; tool and skill execution; sandboxed game environments; evals at scale; and the reliability, safety, and cost systems that let us grow to millions of creators.
- 8+ years of experience building and operating large-scale distributed systems, including technical leadership across multiple teams.
- Deep experience designing backend platforms used by other engineering teams.
- Hands-on experience with production AI/ML systems, such as model serving, orchestration, LLM integration, or agentic execution loops (planning, tool use, recovery, long-running workflows).
- A strong understanding of tool and skill design and structured evaluation for AI systems.
- The judgment to weigh tradeoffs and make pragmatic calls under ambiguity.
- A BS in Computer Science or a related field, or equivalent professional experience.
- Excited to define how AI agents create at scale, and to stay hands-on while doing it.
- A clear communicator who can explain complex technical direction to engineers, product, and leadership.
- Experienced with workflow engines (e.g., Temporal), multi-provider model routing, or AI cost management (bonus).
- 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, including usage metering and model-routing strategy.
- Define how we measure agent quality and build the evaluation infrastructure that drives model, prompt, and skill decisions.
- Partner with Build product teams, ML infrastructure, and Safety to ship new capabilities quickly and safely.
- Raise the engineering bar through design reviews, mentorship, and hands-on technical leadership.
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This posting is sourced from Roblox's own career site — applying takes you there directly.
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This role is one of 9,090 Software Engineer openings and centers on Distributed Systems, Backend Platforms, Production Ai/ml Systems, and Llm Integration. There are 286 open roles at Roblox right now.
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