Job brief: Principal Software Engineer, GenAI Platform

What JoRoute checked · Checked by JoRoute

• Listed on Roblox's own job board. JoRoute does not take listings from job ads or recruiters.
• First seen by JoRoute 2026-11-04 (3 days ago); last confirmed on the board 2026-11-06.
• The apply link opens careers.roblox.com, the address Roblox's board gives for this job.
• No other listing with this title and place on this board in the last 90 days.
• No layoff notices (WARN) under this name in the state files JoRoute reads.

What the listing says · Employer's own words, not checked

• Pay: $328,610 to $362,280 a year
• Job type: Not stated
• Where: San Mateo, CA, United States · San Mateo, CA
• Posted: 2026-10-28

What the job asks · Employer's own words, not checked

Level: Lead / staff. The title says "Principal".

Must have

• An undergraduate/graduate degree in computer science, a related technical field, or equivalent practical experience.
• 8+ years of experience building and operating large-scale production software, distributed systems, cloud services, or related infrastructure.

Conditions

• Own the operational standard for the platform at scale — SLOs, capacity planning, on-call, and incident response and design for graceful degradation and fast recovery, not just st…

Main duties

• Define the multi-year technical vision and architecture for platforms and services that power machine learning, generative AI, and agentic experiences across…
• Drive the hardest, most ambiguous, highest-leverage problems on the platform from framing through production on multi-provider inference resiliency and scali…
• Establish the standards, paved paths, and guardrails that make the platform self-serve for every team at Roblox — multi-tenant usage attribution and metering…
• Make foundational trade-offs in quality, latency, reliability, cost, and responsible data use for systems operating at Roblox scale — treating instrumentatio…
• Own the operational standard for the platform at scale — SLOs, capacity planning, on-call, and incident response and design for graceful degradation and fast…

Lines copied from the posting, not rewritten. "Preferred" or "nice to have" items are not listed as must-haves.

How it compares · Compared by JoRoute from listings

• Typical listed pay for software engineer jobs in San Mateo, CA: $257k a year (150 listings, 2 employers). This listing is 35% higher.
• Across Roblox's 253 open listings, 42% of those with a posting date were first posted more than 60 days ago. How Roblox hires

What nobody outside the employer knows · Not known

• Whether the role is already filled or on hold: employers often leave listings up.
• How many people applied, and who reads the applications.
• Where in the published range an offer would land.

Ask before you apply

1. Which of the listed places is this role based in?
2. What are the interview steps, and when should I expect to hear back?

Share this brief

Send it to someone whose opinion you trust. They can open it without an account, and nothing about you is in the link.

Email itText it

To keep a copy, use your browser's Print or Share button.

Next steps

Apply on the employer's page Full listingDoes my CV fit?Practise the interviewShould I apply?

Got a message about this job asking for money or documents? Check the message first.

Keep looking

• 1,010 more software engineer jobs within 25 miles, on the job map with pay.
• All 253 open Roblox jobs, and how Roblox hires.
• Saw a job somewhere else? Check if the employer still lists it.
• Search every job JoRoute reads from employers' own job boards. No account needed.