Back to jobs

Senior Frontend Engineer

Hybrid - San Francisco

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.
  • Continue to perform with sub-second latency for person entry/exit events in physical spaces..
  • Collaborate closely with designers, product managers, and backend developers to ensure front-end features align with user needs and technical requirements.
  • 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.
  • Optimize applications for maximum performance and scalability, delivering a consistent experience across various devices, including interactive, large-screen applications.
  • Support mobile features using React Native, integrating React components with native modules as needed.
  • Establish a test-driven development culture, writing and maintaining unit, integration, and end-to-end tests to ensure code quality and reliability.
  • 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:

  • 5+ 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.

Bonus:

  • Experience with augmented reality (AR) technologies and integrating AR features into applications.

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

#LI-Hybrid

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.

Apply for this job

*

indicates a required field

Resume/CV*

Accepted file types: pdf, doc, docx, txt, rtf

Cover Letter

Accepted file types: pdf, doc, docx, txt, rtf

Education

Select...
Select...
Select...
Select...
Select...
Select...
Select...

When you apply to a job on this site, the personal data contained in your application will be collected by Density (“Controller”), which is located at 2 Bryant Street, Suite 220 San Francisco, CA 94105 and can be contacted by emailing info@density.io. Controller’s data protection officer is Morgan Murphy, who can be contacted at 888-990-2253. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.

Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under [either the standard contractual clauses or the Privacy Shield]. You can obtain a copy of the standard contractual clauses by contacting us at .

Your personal data will be retained by Controller as long as Controller determines it is necessary to evaluate your application for employment. Under the GDPR, you have the right to request access to your personal data, to request that your personal data be rectified or erased, and to request that processing of your personal data be restricted. You also have to right to data portability. In addition, you may lodge a complaint with an EU supervisory authority.

U.S. Standard Demographic Questions

We invite applicants to share their demographic background. If you choose to complete this survey, your responses may be used to identify areas of improvement in our hiring process.
Select...
Select...
Select...
Select...
Select...
Select...

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey. Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

As set forth in Density’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.

Select...
Select...
Race & Ethnicity Definitions

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Select...

Voluntary Self-Identification of Disability

Form CC-305
Page 1 of 1
OMB Control Number 1250-0005
Expires 04/30/2026

Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to:

  • Alcohol or other substance use disorder (not currently using drugs illegally)
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, HIV/AIDS
  • Blind or low vision
  • Cancer (past or present)
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or serious difficulty hearing
  • Diabetes
  • Disfigurement, for example, disfigurement caused by burns, wounds, accidents, or congenital disorders
  • Epilepsy or other seizure disorder
  • Gastrointestinal disorders, for example, Crohn's Disease, irritable bowel syndrome
  • Intellectual or developmental disability
  • Mental health conditions, for example, depression, bipolar disorder, anxiety disorder, schizophrenia, PTSD
  • Missing limbs or partially missing limbs
  • Mobility impairment, benefiting from the use of a wheelchair, scooter, walker, leg brace(s) and/or other supports
  • Nervous system condition, for example, migraine headaches, Parkinson’s disease, multiple sclerosis (MS)
  • Neurodivergence, for example, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, dyslexia, dyspraxia, other learning disabilities
  • Partial or complete paralysis (any cause)
  • Pulmonary or respiratory conditions, for example, tuberculosis, asthma, emphysema
  • Short stature (dwarfism)
  • Traumatic brain injury
Select...

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.