# Principal Software Engineer, Core Services at Roblox

- Company: Roblox
- What the company does: Roblox is a global platform where millions of people gather together every day to imagine, create, and share experiences with each other in immersive, user-generated 3D worlds. Backed by Greylock, a16z and Index.
- Company website: https://about.roblox.com/
- Type: Startups
- Level: Principal and up
- Location: San Mateo, CA, United States
- Work setup: On-site
- Posted: 2026-09-28
- Apply by: 2026-11-12
- Apply: https://careers.roblox.com/jobs/8227778?gh_jid=8227778
- Page: https://www.1752.vc/careers/jobs/roblox-principal-software-engineer-core-services/

## About the role

A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone.

## What they're looking for

- Deep production experience in C#/.NET or Rust, with the ability and interest to work effectively across both ecosystems
- Experience building and evolving reusable libraries, SDKs, frameworks, or runtime infrastructure adopted by multiple teams
- Strong fundamentals in concurrency, asynchronous programming, memory management, networking, and distributed systems
- A track record of diagnosing complex production problems and delivering measurable performance or reliability improvements
- Experience designing stable APIs and managing compatibility, versioning, dependencies, and adoption across dependent systems
- Demonstrated technical leadership: framing ambiguous problems, explaining tradeoffs, aligning stakeholders, mentoring engineers, and driving cross-team execution

Tags: Software Engineering