Software Engineer, Account Authentication

About the role

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences- all created by our global community of developers and creators. At Roblox, we're building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. You will own the design, implementation, and landing of features that make Roblox more secure and more accessible for users of all ages on all platforms. You will collaborate cross-organizationally with partner teams in Growth, Discovery and the broader Roblox Safety org to help define how goals get accomplished and have real influence over product direction. This role will influence how users first experience Roblox, often forming their baseline expectations for what security should look like on the internet as you instrument and analyze user interaction data to inform design decisions and maximize product impact. You will own implementation end to end across the stack, contributing in Rust, C++, and Lua as projects require, using AI tools wherever possible to drive secure and scalable outcomes.

Key facts

What you'll do

Define and implement authentication and security controls that meet each user's needs while scaling to 1 billion active users globally.

Design adaptive, just-in-time friction mechanisms that respond to unique risk profiles without degrading legitimate user experiences.

Collaborate cross-functionally with Growth, Discovery, and Safety teams to align authentication strategies with product and safety objectives.

Instrument and analyze A/B tests and usage metrics to quantify security impact and guide iterative improvements.

Own the full lifecycle of authentication features from discovery through implementation, testing, and rollout.

Partner with machine learning and AI teams to integrate AI-powered filters and classifiers into authentication workflows.

Lead experiments to validate hypotheses about friction, conversion, and security outcomes across diverse user segments.

Ensure compliance with safety policies, data integrity standards, and regulatory requirements across all supported platforms.

Contribute code in Rust, C++, and Lua to build performant and reliable authentication services.

Champion best practices for secure session management, credential storage, and threat detection across the stack.

Requirements

1-3 years of experience in Software Engineering or Computer Science.

Experience building user-facing applications or services that operate at scale.

Proficiency in one or more programming languages such as Rust, C#, and JavaScript.

Strong understanding of authentication protocols, session management, and identity providers.

Experience implementing security controls and risk-based authentication in production environments.

Ability to collaborate cross-functionally with product, design, and data teams to define and deliver solutions.

A strong commitment to designing, implementing, and maintaining systems that prioritize user safety, data integrity, and compliance.

Comfort working in a fast-paced environment where requirements evolve and ambiguity is common.

Nice to have

Experience with machine learning pipelines or AI tooling relevant to security and fraud detection.

Familiarity with global identity standards and protocols such as OAuth, OpenID Connect, and SAML.

Background in safety-focused product areas or community trust and safety operations.

Practical notes

This is a full-time position based in San Mateo, California, United States.

Candidates must be authorized to work in the United States without sponsorship for this role.