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# Principal Fullstack/Backend Software Engineer, User Connections

- **Company:** Roblox
- **Location:** San Mateo, CA, United States
- **Experience:** Expert
- **Salary:** $295,250.0 - $345,040.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), C Sharp (Programming Language), C++ (Programming Language), Fault Tolerance, Backend, Information Technology, Roblox
- **Published:** October 6, 2026
- **Apply:** https://careers.roblox.com/jobs/7752066?gh_jid=7752066

## About the Role

* 8+ years of experience designing, building, and supporting highly available and large-scale distributed fault tolerant services in production environments
 * Extensive knowledge of server-side architecture and design principles, with proficiency in compiled languages such as C#, Java, C++, or others.
 * Bachelor's degree or higher in Computer Science or a related field.
 * (Bonus) Experience with social products is a plus.

You Are:

 * Proactive: You operate with a sense of urgency, initiating conversations and workflow that pushes team projects and people forward
 * A Leader: You have initiated and facilitated challenging technical decisions across multiple teams and organizations.
 * Scrappy: You are willing to dive into any tech stack to solve problems, and can easily adapt to any situation when the need arises and come up with the right solution.
 * A product owner: You champion for changes that align with the needs of our users

## Description

As a Principal Software Engineer on the User Connections team, you will define the backend systems that power the social ecosystem ranging from Friending, Profiles (Identity + Expression), and other Social engagement. You will be a team lead, influence service architecture designs, and guide the team's roadmap both in technical and product domains.

Your work will power the Roblox ecosystem, helping people recognize and connect with friends & interests on Roblox, express themselves, and discover & engage with the best of Roblox through their connections. You will own critical features used by millions of users daily, such as profiles, names, online presence, co-play tools, as well as develop new zero-to-one features. You will drive company-level objectives for user engagement.

If you are an experienced developer with a deep understanding of large scale systems and enjoy shaping engineering and product vision, you'll be a great fit for this team.

This role is based at Roblox HQ in San Mateo, CA (no remote option).

You Will:

 * Tech lead the engineering team
 * Lead the design and implementation of scalable backend systems to support hundreds of millions of users.
 * Enforce high quality standards throughout feature development and iteration.
 * Collaborate with other engineering, product, and design teams to define and build platform features to enable users to express their identities
 * Mentor engineers and uplevel the team