Principal Fullstack Engineer, User Safety

As a Principal Fullstack Engineer on the User Safety Team at Roblox, your primary responsibilities will include architecting and implementing systems to identify and prevent abuse on the platform, guiding teams to improve scale and efficiency, and developing tools to detect problematic content. You will collaborate with various teams to define platform features that enhance community safety, while resolving performance issues across networking, data, and compute.

Candidates for the Principal Fullstack Engineer, User Safety role at Roblox should have at least 8 years of experience in developing REST or GraphQL-based APIs using languages such as Go, Python, C#, or Java. Proficiency in database technologies like DynamoDB and experience with data pipelines and caching solutions is crucial, along with web application security knowledge. A degree in a technical field or equivalent experience is also expected.

In the Principal Fullstack Engineer, User Safety role at Roblox, familiarity with several programming languages, particularly those used for crafting APIs like Go, Python, and Java, is vital. Additionally, experience with JavaScript frameworks such as React, AngularJS, or Vue.js is expected to effectively deliver web applications and features.

The Principal Fullstack Engineer, User Safety contributes to enhancing user experiences at Roblox by building and refining systems that detect and prevent abusive behavior. By improving the accuracy and efficiency of these systems, they help foster a safer, more enjoyable environment for users, ensuring that their interactions remain positive and civil.

At Roblox, a Principal Fullstack Engineer can expect a collaborative and innovative work culture that prioritizes safety, inclusivity, and creativity. The team values empowerment and encourages open communication, allowing engineers to influence product direction and enhance community experiences. With flexibility in work policies and a focus on employee well-being, it's a supportive environment for professional growth.

When answering this question, describe a project where you used technologies you've mentioned in your resume, such as machine learning or data pipelines. Highlight your role in the system design, the technologies used, and how it positively impacted user safety.

Share your methodology for breaking down complex problems. Discuss how you gather data, collaborate with your team, and make informed decisions based on analytics and best practices. Emphasize your analytical skills and ability to navigate uncertainty.

Detail specific projects where you've worked with distributed systems, mentioning the technologies involved. Discuss the challenges encountered and how you addressed performance, availability, and security concerns in those systems.

Discuss your understanding of common web application security issues—like SQL injection and cross-site scripting—and the best practices you've implemented in past projects to mitigate these risks, such as regular security audits or utilizing specific security frameworks.

Talk about any previous roles where you worked on user safety features or community guidelines. Discuss how you balanced user freedom with the need for safety and how you designed systems or processes to enforce these guidelines.

Elaborate on your experience developing and consuming APIs, especially REST and GraphQL. Mention any microservices architecture you've worked with, the benefits you've observed, and how they relate to system scalability.

Share methods you use to keep current with emerging technologies—whether through online courses, professional groups, tech blogs, or conferences. Highlight how your continuous learning has directly improved your work.

Discuss techniques you've applied for code optimization, such as profiling to identify bottlenecks, or caching strategies to enhance system performance. Provide examples where your optimizations significantly impacted application performance.

Explain your strategies for task prioritization, such as using project management tools or frameworks. Describe how you communicate with teammates to align priorities effectively and ensure all timelines are met without compromising quality.

Provide a specific example of a project where you collaborated with product teams, outlining how you contributed to aligning technical solutions with product goals. Emphasize communication skills and the impact your work had on the final product.