Join to apply for the Senior Frontend Engineer role at Density Join to apply for the Senior Frontend Engineer role at Density About Density Density’s mission is to measure and improve our footprint on the world. About Density Density’s mission is to measure and improve our footprint on the world. We help companies understand how their workplaces are used. We do that by observing behavior in the office through our highly accurate and always anonymous sensors. In other words: where are people actually spending their time? We translate that data into actionable, opinionated insights that help companies increase the financial and experiential performance of any workplace. Today, we work with companies from Fortune 500s to high growth innovators in technology, financial services and healthcare, occupying more than a billion square feet worldwide. And we’re in it for the long game: what if we knew more, created better spaces, and could build cities that worked and felt better? That’s where you come in... About The Role As a Senior Frontend Engineer on our team, you will play a key role in building and refining web applications that transform how people interact with workspaces. Leveraging your expertise in React and modern front-end development, you will create innovative, responsive features for applications that surface IoT data and enhance how people interact with data. You will focus on delivering high-quality front-end solutions that perform seamlessly across a variety of devices, including large-screen, in-office touchscreens, while also supporting mobile functionality with React Native. In This Role You Will Develop and maintain robust, scalable web applications using React, ensuring performance and responsiveness across desktop and large-screen displays. Build apps with sub-second latency for person entry/exit events in physical spaces. Work with a dynamic team and play a major role in shaping the design and experience of our front-ends. Build reusable front-end components and libraries for future use, promoting best practices in code efficiency and modularity. Integrate with backend services and APIs to deliver seamless user experiences and data interactions in real time. Support mobile features using React Native, integrating React components with native modules as needed. Implement and maintain automated testing and CI/CD pipelines using tools like GitHub Actions, enabling automated test runs as part of the pull request flow. Drive cross-browser and cross-device testing to ensure consistent user experiences on all platforms. Maintain and update front-end build processes to support faster development cycles and efficient deployment. The Ideal Candidate Will Have 9+ years of professional experience in front-end development, with a strong focus on React and web-based applications. Proven experience building and optimizing responsive, high-performance web applications. Knowledge of mobile development in React Native is a plus, with a focus on supporting cross-device functionality when needed. Strong understanding of front-end architectures and design patterns, ensuring scalable and maintainable codebases. Proficiency in integrating APIs and managing data flow between the front end and back end. Expertise in test-driven development (TDD) and the ability to create and execute comprehensive tests, including unit, integration, and functional tests. Proficiency in setting up and managing CI/CD pipelines, particularly with GitHub Actions for automated testing and deployment. Familiarity with responsive design principles and cross-browser compatibility, ensuring a consistent experience across all devices. Strong collaboration and communication skills, working effectively with cross-functional teams to deliver high-quality products. Attention to detail and a passion for quality, ensuring that applications are robust, user-friendly, and performant. Experience with or excitement to learn how to best use AI tooling to accelerate prototyping and front end development. Job Compensation Range Salary Range: $150,000 - $225,000 Preferred Primary Location: Commuting distance to San Francisco This is a hybrid role that requires a minimum in office 4 days a week in office in SF: Monday, Tuesday, Thursday & Friday We Offer Excellent benefits including medical, dental, vision, mental and reproductive health, 401K, equity, unlimited and mandatory PTO and more. A company full of fun, smart, talented and legitimately kind teammates. Our culture powers everything we do and we work hard to nurture it by bringing on the right humans. A team hailing from innovators like Apple, LinkedIn, Stripe, Meraki, Flexport, WeWork, NASA & beyond. $227M raised from investors including Kleiner Perkins, Founders Fund and Upfront Ventures. The chance to change the built world as we know it. You can read more about our values here. At Density, we place value in our office culture - the relationships and collaboration it builds and the creativity it brings to the table. We operate as a hybrid workplace in our SF and NYC offices to ensure Denizens can create a work-life balance that best fits them. Density provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. Seniority level Seniority level Mid-Senior level Employment type Employment type Full-time Job function Job function Engineering and Information Technology Industries Technology, Information and Internet Referrals increase your chances of interviewing at Density by 2x Sign in to set job alerts for “Senior Frontend Developer” roles. 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