Principal UX Engineer, Ads

📍 Job Overview

Job Title: Principal UX Engineer, Ads

Company: Reddit

Location: Remote - United States

Job Type: Full-time

Category: UX Engineering / Product Development

Date Posted: 2026-08-11

Experience Level: Principal / Senior (10+ years inferred)

Remote Status: Fully Remote

🚀 Role Summary

• Drive UX Engineering strategy and execution across the Reddit Ads ecosystem, focusing on enhancing advertiser tools, consumer ad experiences, and measurement systems.

• Develop sophisticated interactive prototypes and functional product experiences to validate product hypotheses and inform strategic decisions across design, research, and product teams.

• Establish and implement reusable tools, components, and workflows that streamline the transition from design and research to production-ready code, significantly improving development velocity and quality.

• Elevate the standards for interaction quality, accessibility, performance, and overall technical craft within the Ads product suite.

• Explore and integrate Artificial Intelligence (AI) to enhance both advertiser-facing products and internal design and development processes.

📝 Enhancement Note: This role is positioned as a "Principal" UX Engineer, implying a high level of autonomy, strategic influence, and mentorship responsibility. The focus on "Ads" suggests a deep dive into the complexities of the advertising technology landscape, requiring a blend of technical prowess and business acumen to drive product innovation and efficiency. The emphasis on "code as a product-design medium" indicates a need for individuals who can bridge the gap between conceptual design and functional implementation with a strong user-centric approach.

📈 Primary Responsibilities

• Define and champion the UX Engineering vision and strategic roadmap for key areas within Reddit Ads, ensuring alignment with broader business objectives.

• Architect, build, and iterate on high-fidelity prototypes, proof-of-concepts, and production-quality interactive experiences that serve as tangible explorations of new product directions.

• Collaborate closely with senior Design, Research, Product Management, Engineering, and Data Science leaders to shape product strategy, clarify complex problems, and drive consensus on innovative solutions.

• Develop and maintain a library of reusable UI components, design systems, automation scripts, and development frameworks to accelerate iteration cycles and ensure consistency across the Ads platform.

• Actively contribute to the technical design and implementation of user-facing features, ensuring adherence to best practices in performance optimization, accessibility standards (WCAG compliance), and overall code quality.

• Investigate and pilot the application of AI technologies to augment user experiences, streamline workflows, and provide data-driven insights for both advertisers and internal teams.

• Mentor and guide junior engineers and designers in UX engineering best practices, fostering a culture of technical excellence and collaborative innovation.

• Conduct technical feasibility assessments for new product ideas, providing actionable insights to inform product strategy and resource allocation.

📝 Enhancement Note: The primary responsibilities highlight a blend of strategic leadership, hands-on technical execution, and cross-functional influence. The emphasis on "reusable tools, systems, components, and workflows" points to a need for a strong systems-thinking approach, similar to building internal platforms or developer tools, aimed at improving operational efficiency for the entire Ads organization. The mention of AI integration suggests a forward-looking role that requires an understanding of emerging technologies and their practical application in product development.

🎓 Skills & Qualifications

Education:

• Bachelor's or Master's degree in Computer Science, Human-Computer Interaction, Design, or a related field; or equivalent practical experience. Experience:

• A minimum of 10 years of progressive experience in UX Engineering, Frontend Engineering, or a related role, with a significant portion focused on product development and design systems.

• Demonstrated success in defining and leading technical strategies for complex product areas. Required Skills:

• Deep hands-on expertise in modern frontend development, with strong proficiency in React and TypeScript.

• Proven ability to build sophisticated, high-quality interactive prototypes and functional product experiences.

• Exceptional product and interaction design judgment, with a keen eye for detail and user experience.

• Strong systems thinking capabilities, including experience designing and implementing reusable patterns, platforms, or tools that enhance team velocity.

• Demonstrated ability to navigate ambiguity, make informed tradeoffs, and synthesize diverse perspectives from design, engineering, product, and research.

• Excellent communication, presentation, and interpersonal skills, with a proven track record of collaborating effectively with senior cross-functional stakeholders.

• A passion for staying technically current and hands-on while also fostering the growth of others. Preferred Skills:

• Experience within the advertising technology (AdTech) domain, understanding of ad platforms, measurement, or advertiser tools.

• Familiarity with AI/ML concepts and their application in product development or user experience enhancement.

• Experience working with complex, multi-sided ecosystems such as marketplaces, enterprise SaaS, analytics platforms, or developer platforms.

• Contributions to open-source projects or significant involvement in the developer community.

• Experience with performance optimization techniques and web accessibility standards (e.g., WCAG 2.1 AA).

📝 Enhancement Note: The "Principal" level designation strongly implies a need for extensive experience, likely 10+ years, with a significant track record of leadership and impact. The required skills emphasize a dual expertise in deep technical frontend development (React, TypeScript) and strong product/interaction design sensibilities. The preferred skills indicate that experience in AdTech or complex platforms is advantageous, as is an understanding of AI, which is explicitly mentioned as an area of exploration for the role.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase a minimum of 3-5 complex projects that demonstrate your ability to bridge design and engineering, ideally involving interactive prototypes or functional product features.

• For each project, clearly articulate the problem statement, your specific role and contributions, the technical challenges overcome, and the impact or learning outcomes.

• Highlight examples of reusable systems, tools, components, or workflows you've designed or implemented that improved efficiency, consistency, or quality for a team or organization.

• Include case studies demonstrating your ability to influence product direction, navigate ambiguity, and collaborate effectively with cross-functional partners.

• Provide evidence of your expertise in modern frontend technologies (React, TypeScript) and your approach to interaction design, accessibility, and performance. Process Documentation:

• Demonstrate a clear understanding of the product development lifecycle from ideation and research through to production and iteration.

• Detail your methodologies for translating design concepts into functional prototypes and production code, emphasizing efficiency and quality.

• Illustrate your approach to building and maintaining design systems, component libraries, or internal tools that support scalable product development.

• Showcase examples of how you've measured the impact of your work, whether through user feedback, performance metrics, or adoption rates of tools and systems.

📝 Enhancement Note: For a Principal UX Engineer role, a portfolio is critical. It needs to go beyond just showcasing UI work and demonstrate strategic thinking, technical leadership, and the ability to build scalable systems and processes. The emphasis on "reusable tools, systems, components, and workflows" means candidates should highlight projects where they've created assets that other teams leverage, demonstrating a multiplier effect. Evidence of influencing product direction and navigating ambiguity is also key for a principal-level candidate.

💵 Compensation & Benefits

Salary Range: $245,800 - $344,100 USD per year (Base Salary)

Benefits:

• Comprehensive Healthcare: Medical, dental, and vision insurance.

• Income Replacement Programs: Likely includes short-term and long-term disability insurance.

• Retirement Savings: 401k plan with employer matching contributions.

• Equity: Eligible for Restricted Stock Units (RSUs).

• Global Benefit Programs: Tailored benefits including workspace stipends, professional development support, and caregiving assistance.

• Family Support: Family planning services and generous paid parental leave.

• Gender-Affirming Care: Coverage for gender-affirming medical treatments.

• Mental Health & Coaching: Access to mental health resources and professional coaching services.

• Work-Life Balance: Flexible vacation policy and paid time off for volunteer activities.

Working Hours:

• Standard full-time work week, typically around 40 hours. The remote nature and "Principal" level suggest a degree of flexibility in scheduling, with an emphasis on results and collaboration rather than strict adherence to hours, provided core responsibilities and team interactions are met.

📝 Enhancement Note: The provided salary range is for base compensation. As a Principal Engineer at a company like Reddit, significant additional compensation is expected through equity (RSUs). The benefits package is comprehensive, covering health, financial well-being, personal development, and work-life balance, which are standard for senior roles at major tech companies. The mention of "Global Benefit programs" suggests a broad scope of support beyond traditional benefits.

🎯 Team & Company Context

🏢 Company Culture

Industry: Social Media / Technology / Advertising Platforms

Company Size: Large (Reddit has thousands of employees, as indicated by general knowledge and the nature of the role).

Founded: Reddit was founded in 2005. This long history indicates a mature company with established processes, but also a culture that has evolved and likely retains elements of its startup origins, fostering innovation.

Team Structure:

• The Ads Design & Research team is cross-functional, comprising Design, Research, Product Management, Engineering, and Data Science professionals.

• This role is within the Ads Design & Research team, specifically focusing on UX Engineering, and will likely report into a Design or Engineering leadership role within that function.

• Close collaboration is expected with Product Managers, Designers, Researchers, and Software Engineers across various Ads product areas. Methodology:

• The team operates with a strong emphasis on user-centered design principles, data-driven decision-making, and agile development practices.

• The UX Engineering function is positioned to bridge the gap between conceptualization and implementation, focusing on rapid prototyping, technical validation, and building robust, scalable solutions.

• A data-informed approach is crucial, leveraging analytics and user research to guide product direction and measure impact.

Company Website: https://www.redditinc.com/

📝 Enhancement Note: Reddit's culture is often described as community-driven, open, and iterative. For a Principal UX Engineer, this translates to an environment where their technical craft and ability to influence product direction will be highly valued. The "community of communities" ethos likely extends to internal team dynamics, encouraging diverse perspectives and collaborative problem-solving. The Ads division operates within a competitive market, necessitating a focus on innovation, efficiency, and measurable results.

📈 Career & Growth Analysis

Operations Career Level: Principal UX Engineer

This level signifies a senior individual contributor role with significant strategic influence and technical depth. Principal engineers are expected to:

• Lead technical strategy for major product initiatives or functional areas.

• Mentor and elevate the skills of other engineers and designers.

• Tackle the most complex and ambiguous technical challenges.

• Contribute to architectural decisions and long-term technology roadmaps.

• Act as a thought leader within their domain and across the organization. Reporting Structure:

The role likely reports into a Director or VP of Design or Engineering within the Ads organization. This position will have significant dotted-line reporting and collaboration with Product Management and Research leadership.

Operations Impact:

The impact of this role is substantial, directly influencing the quality, efficiency, and user experience of Reddit's advertising products. By creating better tools, systems, and prototypes, this engineer will:

• Accelerate product development cycles, leading to faster time-to-market for new features.

• Improve the effectiveness and usability of advertiser tools, driving revenue growth.

• Enhance the overall quality and performance of ad experiences, benefiting both users and advertisers.

• Elevate the technical craft and design standards across the Ads organization.

• Contribute to the strategic direction of Reddit's advertising business through technical innovation and validation. Growth Opportunities:

• Technical Specialization: Deepen expertise in specific areas like AI integration in product development, advanced frontend architecture, or performance optimization for large-scale systems.

• Leadership Development: Transition into management roles leading UX Engineering teams, or take on broader technical leadership responsibilities as a Staff or Principal Engineer across multiple product areas.

• Cross-Functional Expansion: Gain deeper experience in product strategy, business development, or data science through close collaboration.

• Mentorship & Advocacy: Become a key voice in shaping Reddit's design and engineering culture, mentoring emerging talent, and evangelizing UX Engineering best practices.

• Industry Influence: Contribute to industry standards through speaking engagements, publications, or open-source contributions.

📝 Enhancement Note: At the Principal level, growth is often about increasing scope, influence, and mentorship capacity rather than just climbing a ladder. For a UX Engineer, this means becoming a go-to expert, a strategic partner to leadership, and a key driver of technical innovation. The role provides a strong foundation for either continued individual contribution at an even higher technical echelon or a transition into engineering management.

🌐 Work Environment

Office Type: Fully Remote. This implies a distributed workforce with no central office requirement for this specific role.

Office Location(s): While the role is remote within the United States, Reddit maintains offices in various locations (e.g., San Francisco, New York, Dublin). This indicates a larger organizational infrastructure that supports remote employees with potential for in-person meetups or team gatherings.

Workspace Context:

• Collaborative Environment: Despite being remote, expect a highly collaborative environment facilitated by robust communication tools (e.g., Slack, video conferencing) and structured remote work practices.

• Tools & Technology: Access to modern development tools, cloud infrastructure, and internal platforms necessary for designing, prototyping, and building complex web applications.

• Team Interaction: Regular virtual stand-ups, design reviews, engineering syncs, and cross-functional meetings to ensure alignment and foster a sense of team cohesion. Opportunities for informal virtual "water cooler" chats may also exist.

Work Schedule:

• While the role is remote, a standard full-time schedule (approx. 40 hours/week) is expected. However, the emphasis on results and the Principal level often allows for flexibility in how and when work is accomplished, provided collaboration and deliverables are met. Coordination across US time zones will be a key consideration.

📝 Enhancement Note: The fully remote nature of this role requires strong self-discipline, proactive communication, and comfort with virtual collaboration tools. The company's commitment to global benefits suggests support for creating an effective remote workspace. The challenge will be maintaining strong connections and influence within a distributed team structure.

📄 Application & Portfolio Review Process

Interview Process:

1. Recruiter Screen: Initial conversation to assess general fit, experience, and understanding of the role.

2. Hiring Manager Interview: Deeper dive into your background, motivations, and alignment with the team's goals and the Principal UX Engineer responsibilities. This may include behavioral questions and scenario-based discussions.

3. Portfolio Review & Technical Deep Dive: A dedicated session where you present selected projects from your portfolio. This will involve discussing your process, technical approach, design decisions, and impact. Expect in-depth questions about your code, system design, and problem-solving methodologies.

4. Cross-Functional Interviews: Meetings with potential peers and stakeholders from Design, Product, and Engineering. These interviews will assess your collaboration style, ability to influence, and how you navigate complex product discussions.

5. Principal-Level / Leadership Interview: A final interview, likely with a senior leader (e.g., Director, VP), focusing on strategic thinking, leadership potential, mentorship capabilities, and overall cultural fit.

Portfolio Review Tips:

• Curate Strategically: Select 3-5 projects that best showcase your unique blend of UX engineering, product design, systems thinking, and leadership. Prioritize projects that demonstrate impact, complexity, and your ability to solve challenging problems.

• Tell a Story: For each project, clearly articulate the "why" (problem), "what" (your solution), and "so what" (impact/results). Use frameworks like STAR (Situation, Task, Action, Result) or similar for behavioral questions.

• Show, Don't Just Tell: Prepare interactive demos or well-annotated walkthroughs of your prototypes. For systems/tools, explain the architecture, benefits, and adoption.

• Quantify Impact: Whenever possible, use data and metrics to demonstrate the success of your work (e.g., "reduced load time by X%", "increased conversion by Y%", "streamlined workflow saving Z hours/week").

• Highlight Collaboration: Be prepared to discuss how you partnered with Design, Product, and Engineering, and how you navigated disagreements or differing perspectives.

• Address Ambiguity: Showcase instances where you had to define a problem or solution in the face of uncertainty.

Challenge Preparation:

• Expect potential take-home assignments or live coding/design challenges that simulate real-world problems. These might involve:

  • Building a functional prototype for a new feature.
  • Refactoring existing code for performance or accessibility.
  • Designing a reusable component or system.
  • Analyzing a hypothetical product problem and proposing a solution.

• Focus on demonstrating your thought process, coding best practices, efficiency in execution, and ability to communicate your approach clearly.

📝 Enhancement Note: The interview process for a Principal role is rigorous and multi-faceted. The portfolio review is a cornerstone, demanding candidates to articulate not just what they built, but why and how, demonstrating strategic thinking and technical depth. Candidates should prepare to discuss their contributions to systems and processes that scale, and how they've influenced product direction.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend Frameworks: React (required), potentially others like Vue.js or Angular for context.

• Languages: TypeScript (required), JavaScript.

• Styling: CSS-in-JS libraries (e.g., Styled Components, Emotion), Sass/SCSS, Tailwind CSS.

• State Management: Redux, Zustand, Context API, or similar.

• Build Tools: Webpack, Vite, Babel.

• Version Control: Git (e.g., GitHub, GitLab, Bitbucket).

Analytics & Reporting:

• Internal Analytics Platforms: Likely custom-built or integrated solutions for tracking user behavior and product performance within Reddit's ecosystem.

• Data Visualization Tools: Tableau, Looker, or internal dashboards for analyzing user data and product metrics.

• A/B Testing Frameworks: Tools for experimentation and validating product hypotheses.

CRM & Automation:

• While this role is primarily engineering-focused, familiarity with how CRM data (e.g., Salesforce) integrates with frontend experiences or how automation impacts user workflows might be beneficial, especially in an Ads context. Prototyping & Design Tools:

• Figma, Sketch, Adobe Creative Suite (for understanding design outputs).

• Prototyping tools like Framer, Principle, or custom-built solutions. AI & Machine Learning:

• Familiarity with AI/ML concepts and potential integration points, though deep ML engineering expertise is not explicitly required. Understanding of APIs for AI services.

📝 Enhancement Note: The core technical requirements are React and TypeScript. However, a Principal UX Engineer should demonstrate breadth and depth across the modern frontend ecosystem, including state management, styling solutions, build tools, and version control. The mention of AI integration implies familiarity with APIs and potentially ML frameworks at a conceptual level. Experience with internal tooling and data analytics platforms is also highly relevant given the Ads context.

👥 Team Culture & Values

Operations Values:

• Community & Collaboration: Embodying the "community of communities" ethos internally, fostering an inclusive and supportive environment where diverse perspectives are valued.

• Impact-Driven: Focusing on delivering tangible value and measurable results that contribute to Reddit's growth and user satisfaction, particularly within the Ads business.

• Craftsmanship & Quality: Upholding high standards for technical execution, design fidelity, accessibility, and performance in all aspects of product development.

• Innovation & Experimentation: Encouraging exploration of new technologies and approaches, including AI, and embracing iterative development and learning from failures.

• Transparency & Openness: Promoting clear communication, knowledge sharing, and constructive feedback loops across teams.

Collaboration Style:

• Cross-Functional Partnership: Proactive and collaborative engagement with Design, Research, Product, and Engineering teams, acting as a bridge between disciplines.

• Empathetic Communication: Ability to understand and articulate the needs and perspectives of different stakeholders, facilitating consensus and alignment.

• Mentorship & Knowledge Sharing: A willingness to guide and support colleagues, share expertise, and contribute to the collective growth of the team's capabilities.

• Constructive Feedback: Providing and receiving feedback openly and respectfully to drive continuous improvement in both products and processes.

📝 Enhancement Note: Reddit's stated values often revolve around community, transparency, and impact. For a Principal UX Engineer, this means being a collaborative team player who champions quality and innovation, and who can effectively communicate complex technical and design ideas to a wide range of stakeholders. The emphasis on "craft" suggests a deep respect for technical excellence and user experience.

⚡ Challenges & Growth Opportunities

Challenges:

• Navigating Ambiguity: The Ads space is complex and rapidly evolving. Defining clear product direction and technical strategies in ambiguous situations will be a recurring challenge.

• Balancing Innovation with Production: Simultaneously driving forward ambitious new ideas (e.g., AI integration) while maintaining and improving existing production systems requires careful prioritization and resource management.

• Cross-Team Alignment: Ensuring consistent UX and technical quality across multiple product areas and engineering teams requires strong influencing skills and clear communication.

• Scaling Systems: As Reddit's Ads business grows, the need to build scalable, performant, and maintainable systems will be paramount.

• Advancing UX Engineering: Continually defining and elevating the role and impact of UX Engineering within a large organization.

Learning & Development Opportunities:

• AI & ML Integration: Deep dive into applying AI/ML techniques to enhance user experiences and internal workflows within the Ads domain.

• Advanced Frontend Architecture: Opportunities to work on and influence the architecture of large-scale frontend applications and design systems.

• Product Strategy & Business Acumen: Gain deeper insights into the advertising industry, market dynamics, and Reddit's business objectives through close collaboration with product leadership.

• Technical Leadership: Develop skills in mentoring, strategic planning, and influencing technical direction at a principal/staff level.

• Industry Engagement: Potential to represent Reddit at conferences, contribute to industry discussions, or engage with the broader developer community.

📝 Enhancement Note: This role offers significant opportunities for growth by tackling complex, high-impact challenges within a dynamic industry. The primary growth path for a Principal engineer often involves deepening expertise, expanding strategic influence, and mentoring others, rather than solely moving into management.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you defined the UX engineering strategy for a complex product area. What was your approach, and what was the outcome?"

• "How do you balance the need for rapid prototyping and exploration with the requirements of building stable, production-ready code?"

• "Walk me through a situation where you had to influence product direction based on technical feasibility or UX best practices. How did you approach it?"

• "What are your thoughts on the role of AI in product design and development for advertising platforms? How would you explore its potential at Reddit?" Company & Culture Questions:

• "What interests you about Reddit and the Ads product space specifically?"

• "How do you approach collaboration with designers, researchers, and product managers, especially in a remote setting?"

• "Describe your philosophy on mentorship and how you help elevate the skills of your colleagues."

• "How do you stay current with emerging technologies and trends in frontend development and UX engineering?" Portfolio Presentation Strategy:

• Focus on Impact: For each project, clearly articulate the business problem solved and the measurable impact achieved.

• Highlight Technical Craft: Be prepared to discuss architectural decisions, code quality, performance optimizations, and accessibility considerations.

• Demonstrate Systems Thinking: Explain how your work contributed to reusable components, libraries, or workflows that benefited the broader team or organization.

• Showcase Problem-Solving: Walk through your thought process for tackling complex or ambiguous challenges.

• Engage Your Audience: Be interactive, ask clarifying questions, and tailor your presentation to the interviewer's background.

Challenge Preparation:

• Be ready to write clean, efficient, and well-documented code (React/TypeScript) under time constraints.

• Practice designing and articulating solutions for common frontend or UX problems.

• Think about how to optimize for performance, accessibility, and maintainability.

• Prepare to explain your choices and trade-offs clearly.

📝 Enhancement Note: Interview preparation should focus on demonstrating strategic thinking, technical leadership, and a deep understanding of UX engineering principles applied to complex product challenges. Candidates should be ready to articulate their impact with data and discuss how they foster collaboration and mentor others.

📌 Application Steps

To apply for this Principal UX Engineer position:

• Submit your application through the provided link on Greenhouse.

• Portfolio Customization: Carefully curate your portfolio to highlight projects that best demonstrate your expertise in React, TypeScript, UX engineering, systems thinking, and cross-functional influence, aligning with the requirements of this specific role.

• Resume Optimization: Tailor your resume to emphasize your experience in building sophisticated interactive products, defining technical strategies, creating reusable systems, and working in complex ecosystems. Use keywords from the job description.

• Interview Preparation: Practice articulating your thought process, technical decisions, and project outcomes. Prepare detailed examples using the STAR method and be ready to present your portfolio with confidence.

• Company Research: Familiarize yourself with Reddit's products, culture, and the advertising landscape. Understand Reddit's mission and how the Ads team contributes to it.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.