Senior/Staff Web Platform Engineer Job at Perplexity (San Francisco)

Job Description

Perplexity is looking for experienced Software Engineers to join a new Web Platform team. This team is critical to the development infrastructure behind Perplexity’s web-based products, including the core answer experience and the Comet AI browser surfaces. You will be responsible for building and maintaining the systems that enable Perplexity’s product teams to deliver high‑quality, performant single‑page web applications across desktop, mobile web, and the Comet browser. You will work on initiatives such as DevProd infrastructure for our SPAs, build tooling and CI pipelines, performance optimization for query and browsing flows, and migrations and refactors of core web surfaces. You will own and evolve our frontend platform, including build tools, linting and type‑safety workflows, and improved alerting and monitoring systems, to ensure fast, reliable, and consistent web experiences across multiple product surfaces.

Job Responsibility

Optimize performance for critical web flows (search, answer rendering, browsing), with a focus on improving application response speed and perceived latency
Design and implement solutions for customizable user interfaces and experience components across Perplexity and Comet
Develop and improve frontend alerting and monitoring systems to ensure reliability and rapid incident response for web experiences
Build self-serve capabilities and primitives that allow feature teams to ship frontend components and flows quickly without deep platform expertise
Support developer productivity initiatives to improve the ergonomics of web development at Perplexity (tooling, CI/CD, local dev workflows, documentation)
Contribute to upgrading and maintaining core web technologies (e.g., React, TypeScript, build tooling) used across Perplexity’s web stack
Collaborate closely with product, design, search, infra, and mobile teams to deliver cohesive, performant web experiences end to end
Participate in planning and roadmap discussions to ensure appropriate scoping, sequencing, and engineering allocation for platform work

Requirements

6+ years of practical experience as a software engineer with a strong focus on web technologies
Deep expertise in modern JavaScript frameworks, particularly React
Experience optimizing web application performance and working with metrics such as time-to-first-byte, time-to-interactive, and application response speed
A strong technical background in frontend and/or full-stack development, ideally on high-traffic consumer or prosumer products
Familiarity with frontend monitoring and alerting systems (e.g., Sentry, Datadog, Grafana, OpenTelemetry-based tooling)
A track record of successfully managing technical migrations or large refactors in production web environments
Experience supporting developer productivity and building tooling or abstractions that other engineers rely on daily
Excellent collaboration skills and the ability to work effectively across product, design, and multiple engineering teams
A history of delivering high-quality, scalable software in production environments

Nice to have

Experience working with AI products or integrating AI models into web applications, particularly in search, chat, or browsing experiences
Background in design systems implementation and shared component libraries used across multiple product surfaces
Experience with multi-region deployment architectures and edge rendering for low-latency global web performance
Knowledge of accessibility standards (WCAG) and practical implementation in complex, interactive web UIs
Proficiency with TypeScript and strong typing systems, including building well-typed internal libraries and SDKs
Experience with frontend performance optimization techniques (profiling, code splitting, caching strategies, image optimization, RUM)
Background in building developer tools or infrastructure for web teams, such as scaffolding tools, CLIs, or shared CI/CD pipelines

What we offer

Offers Equity
Full-time U.S. employees enjoy a comprehensive benefits program including equity, health, dental, vision, retirement, fitness, commuter and dependent care accounts, and more
Full-time employees outside the U.S. enjoy a comprehensive benefits program tailored to their region of residence

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Senior/Staff Web Platform Engineer

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