Frontend Engineer jobs in United States
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Topsort · 1 day ago

Frontend Engineer

positionSomerville, MA
timeFull-time
remoteOnsite
seniorityMid, Senior Level
date2+ years exp

Topsort is a rapidly growing company focused on democratizing advertising technologies and creating a privacy-first environment. As a Senior Front-End Developer, you will be responsible for building and optimizing user-facing features, collaborating closely with various teams to deliver seamless web experiences.

Ad ExchangeAdvertising PlatformsArtificial Intelligence (AI)E-Commerce PlatformsMarketplaceRetail Technology
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H1B Sponsor Likelynote

Responsibilities

Develop, maintain, and optimize front-end components and user interfaces
Work closely with designers, product managers, and backend developers to implement new features
Ensure cross-browser compatibility and responsive design for web applications

Qualification

JavaScriptReactHTMLCSSNext.jsWeb performance optimizationResponsive designFront-end build toolsPython frameworksPostgreSQLCuriosityTeam collaborationAdaptability

Required

Bachelor's in Computer Science, Design, or related field
2+ years of experience in front-end development
Strong knowledge of JavaScript, HTML, CSS, and front-end frameworks such as React
Proficiency in modern JavaScript frameworks (React, Vue.js, or similar)
Experience with front-end build tools and workflows (Webpack, Babel, NPM)
Strong understanding of responsive design, accessibility, and web performance optimization
Availability to work 4 days a week onsite from our Somerville office

Preferred

Experience with Next.js or server-side rendering (SSR)
Contributions to open-source projects or development of high-traffic web applications
Demonstrated experience working in a three-tier application architecture
Experience working with Python frameworks like FastAPI
Experience working with PostgreSQL

Company

Topsort

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Topsort provides AI-powered auction tools and infrastructure APIs to help brands build ad businesses without cookies or user tracking.
dateFounded in 2021
location
Palo Alto, California, USA
people-size51-200 employees
web-link
https://www.topsort.com

H1B Sponsorship

Topsort has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (5)
2024 (3)

Funding

Current Stage
Growth Stage
Total Funding
$28.5M
Key Investors
W23MolocoUpload Ventures
2025-11-24Series Unknown
2024-07-11Corporate Round
2024-02-05Series A· $20M

Leadership Team

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Regina Ye
Co-Founder and CEO
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Francisco Larrain
Co-Founder & CTO
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Recent News

hs-sites.com
Scaling AI in Latin America – A Conversation with Microsoft
2025-12-22
InternetRetailing
Topsort strengthens UK position with acquisition of offsite measurement firm Phuzion Media
2025-10-23
InternetRetailing
Skai unlocks hard-to-reach retail media markets with Topsort partnership
2025-09-23
Company data provided by crunchbase