Senior Frontend Engineer

Were quickly growing and super excited for you to join us!

Why Topsort Why now

Topsort is changing the way Retail Media works. By joining our scaling team youll feel your impact from day 1. The processes and messaging you build today will be a critical part of our foundation as we accelerate toward 200 Topsorters worldwide and your innovations will leave a lasting mark on the industry as a whole. Retail Media is on the verge of a new era and Topsort is gathering the ecosystem together to shape a brighter future. Joining us now youll work directly alongside our co-founders and founding members to bring on Retail Media 3.0. If youre looking to define your career as something greater than yourself come scale with us.

What its like to work at Topsort

Our team is all about straightforward communication embracing feedback without taking it personally and fostering a super collaborative environment. Its a sports team thats hyper focused on winning collaborative internally and competitive externally - never the other way around. We thrive on working in the open lifting each other up and getting things done with a sense of urgency. Were the kind of team that loves making bold choices sharing extraordinary opinions and maintaining a 100 mph pace. No endless meetings here if it can be done today were all about getting it done today.

What is this Role like

As a Senior Front-End Developer at Topsort youll be responsible for building and optimizing user-facing features that power our platform working closely with designers product managers and backend engineers to deliver seamless and responsive web experiences. Youll work primarily with modern JavaScript frameworks like React (and ideally ) focusing on performance accessibility and scalability. This role is ideal for someone who thrives in a fast-paced startup environment enjoys turning complex problems into intuitive interfaces and takes pride in clean maintainable code.

What you will do at Topsort:

• 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.

What we expect from you:

• Bachelors in Computer Science Design or related field.
• 5 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 or similar).
• Experience with front-end build tools and workflows (Webpack Babel NPM).
• Strong understanding of responsive design accessibility and web performance optimization.
• Preferred experience: Experience with or server-side rendering (SSR). Contributions to open-source projects or development of high-traffic web applications.

Desirable

• Demonstrated experience working in a three-tier application architecture
• Experience working with Python frameworks like FastAPI
• Experience working with PostgreSQL

About Topsort

At Topsort we believe in the mission of democratizing the secret technologies of the walled gardens and creating a privacy-first cookie-free world of clean advertising with modern tech friendly products and AI. We believe in making advertising intuitive intelligent and genuinely cool without any of the creepy ads or cookie-obsession (well maybe just the chocolate ones). In a rapidly changing industry were on a mission to democratize monetization access for all and ensure that advertising doesnt leave any brand or seller feeling confused or overwhelmed

Today Topsort has 5 major hubs worldwide and employees in 13 countries including Menlo Park Boston Santiago Chile Sao Paulo Brazil Barcelona Spain and Sydney Australia. We are a truly global company that was born in the pandemic thats had rapid growth since out of a genius product a customer-first mentality and a hardworking team of talented individuals. Since our founding in 2021 weve gained customers in retail marketplaces and delivery apps in 40 countries and quickly approaching the #1 position in the industry.

Do you enjoy a fast-paced environment Do you like seeing your work create real-time impact being part of a rocket ship from the very beginning Lets do the unimaginable - lets make ads clean and cool again with AI and modern technology.

Topsort Culture

• Speed:We work hard set aggressive goals and execute flawlessly to accomplish them. We give candid feedback push each other to set higher goals and produce more impact by always thinking how do we do this faster and better
• Fast Growth:We believe startup scaleup is just like a team sport. Its been written in our motto since day 1 that we are collaborative internally competitive externally and never the other round around. You are ultimately surrounded by just different people that are all here to help you get the job done and shine as a team.
• Intellectual Rigor and Individuality: We were born in the pandemic by Stanford and Harvard alum cofounders who offer remote-working options with coworking memberships and (at least) once a year in person offsite gathering. Youll be welcomed by coworkers in 11 countries that all bring a unique perspective to the company from day 1. From personalized birthday gifts to work anniversaries and management training program or in-person gatherings or career talks and mentorships part-time DJs and tik-tok vloggers are also commercial leaders and technical staff at Topsort. We dont take management with a cookie cutter approach - but rather we cherish your quarks and think it makes us stronger.

Do you sound like the right fit Lets dive right in!