Senior UX Engineer, Prototyping Platforms

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 116 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com.

This role is completely remote-friendly. If you happen to live close to one of our physical office locations, our doors are open for you to come into the office as often as you'd like.

The Reddit Proto team plays a pivotal role in bridging the gap between ambitious product and design vision and engineering reality. As we scale, the team is responsible for moving the organization beyond one-off, disposable prototypes toward robust, reusable infrastructure. Our goal is to operationalize experimentation, empowering researchers and designers to test hypotheses with live data at the speed of thought.

As a Senior UX Engineer on the Reddit Proto Team, you will lead the evolution from one-off, disposable prototypes to a robust platform for scaled experimentation. Inspired by the concept of an “invention factory,” you will architect the modular systems that allow us to test bold ideas with internal stakeholders and external users alike. Your work will operationalize innovation, turning the Proto Team into a strategic, data-generating force that ensures our ability to explore, validate, and invent the future of Reddit scales alongside our user base.

You will take ownership of the technical strategy for design validation, influencing how Reddit measures the success of new features before they enter production. This requires a unique blend of full-stack engineering capability, systems thinking, and a deep understanding of user-centered design principles. You will inspire the team to move faster and push the quality bar of our internal tooling.

Responsibilities:

Shape the vision: Define the technical architecture for Reddit’s prototyping ecosystem. You will lead the strategy for how we transition from static designs to interactive, data-driven experiments.

Build the platform: Architect and maintain a robust, web-based (React, Next.js) prototyping environment. This infrastructure must be flexible enough to allow for dynamic swapping of screens and journeys for scaled A/B testing.

Accelerate velocity: Partner closely with UXR to drastically reduce the time-to-insight for complex product questions. You will automate the “grunt work” of testing, building tools that allow us to deploy quantitative tests to hundreds of users with minimal overhead.

Bridge the gap: Act as the translation layer between Design concepts and Production engineering. You will manage real data flows to create experiences that feel authentic, ensuring we are testing relevance rather than “happy-path” illusions.

Tooling leadership: Identify repetitive workflows within the design organization and build internal tools or component libraries to solve them. If we are building it twice, you build the tool that automates it.

Mentorship: Cultivate a culture of technical curiosity within the design team, establishing best practices for prototype engineering, performance, and code quality.

Required Qualifications:

Experience: 5+ years of experience in UX Engineering, Design Technology, or Frontend Development, with a focus on building systems, platforms, or complex internal tools.

Technical Mastery: Deep expertise in the modern web stack (React, Next.js, Node, Firebase, Cursor). You are comfortable setting up infrastructure and architecture, not just polishing UI.

Systems Thinking: A portfolio or track record demonstrating the ability to build scalable frameworks, component libraries, or testing environments rather than just single-use websites.

Strategic Leadership: Ability to identify “time sinks” in the design process and autonomously propose and build technical solutions to remove them.

Bias for Action: You are a self-unblocker who thrives in ambiguity. You know when to hack for speed to prove a concept and when to engineer for stability to support a platform.

Design Fluency: You speak the language of designers. You understand interaction design, accessibility, and the importance of fidelity in user research.

Proven Impact: A track record of shipping internal tools or platforms that have measurably improved team efficiency or product outcomes.

Benefits:

Comprehensive Healthcare Benefits and Income Replacement Programs

401k with Employer Match

Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support

Family Planning Support

Gender-Affirming Care

Mental Health & Coaching Benefits

Flexible Vacation & Paid Volunteer Time Off

Generous Paid Parental Leave

#LI-SP1

Pay Transparency:

This job posting may span more than one career level.

In addition to base salary, this job is eligible to receive equity in the form of restricted stock units, and depending on the position offered, it may also be eligible to receive a commission. Additionally, Reddit offers a wide range of benefits to U.S.-based employees, including medical, dental, and vision insurance, 401(k) program with employer match, generous time off for vacation, and parental leave. To learn more, please visit https://www.redditinc.com/careers/.

To provide greater transparency to candidates, we share base pay ranges for all US-based job postings regardless of state. We set standard base pay ranges for all roles based on function, level, and country location, benchmarked against similar stage growth companies. Final offer amounts are determined by multiple factors including, skills, depth of work experience and relevant licenses/credentials, and may vary from the amounts listed below.

The base pay range for this position is:$180,200—$252,300 USDIn select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording, transcription and summarization prior to any scheduled interviews.

During the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable. We will not sell your personal information or disclose it to any third party for their marketing purposes. We will delete any recording of your interview promptly after making a hiring decision. For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors.

Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve. Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.