Senior Frontend Engineer - React.JS (Portugal, f/m/d)

F11

Porto

On-site

EUR 50,000 - 70,000

Full time

14 days+

A complete application in a minute

Tailored resume and cover letter, ready to send.

Get past ATS filters

Benefits offered by this job

Transparent, above-market salaries

100%-remote within Europe

Flexible work-hours

In-person department events

Professional development fund

Job summary

A leading ad-tech company in Portugal is seeking a Senior Frontend Engineer to develop UI components with React.js. The role involves mentoring, enhancing application performance, and working in a remote setting. Ideal candidates should have over 6 years of experience and a deep understanding of frontend technologies like TypeScript, GraphQL, and Jest. Join a growing team dedicated to driving advancements in digital advertising.

Qualifications

6+ years of professional experience in a similar position.
Proven expert knowledge of TypeScript, JavaScript, CSS, and HTML.
Quality-focused mindset with passion for user experience.

Responsibilities

Meet with the development team to discuss interface ideas.
Develop and implement highly responsive user interface components.
Monitor and improve front-end performance.

Skills

TypeScript

JavaScript

CSS

HTML

React.js

Vite

Jest

Cypress.js

Git

npm

Docker

Jira

Debugging

Job description

1 month ago Be among the first 25 applicants

YOUR MISSION

We are looking for a highly-skilled Senior Frontend Engineer to join one of our development teams. In this role, you will be responsible for developing and implementing user interface components using React.js with technologies such as TypeScript, GraphQL, Jest, Cypress and Vite, as we build the future of AI-powered digital advertising. You will also be responsible for testing, profiling and improving front‑end performance and documenting our front‑end codebase, and mentoring your teammates, planning tasks and estimating workloads.

You’ll be working within a cross‑disciplinary team under the Engineering Manager to contribute to our multi‑tenant SaaS product. This is a high‑impact role for someone who thrives on elevating engineering standards, and driving a forward‑thinking, AI‑first approach across the organization.

To ensure success as a senior frontend engineer, you should have in‑depth knowledge of React concepts, excellent front‑end coding skills, and a great understanding of progressive web applications. Ultimately, a top‑class Senior Frontend Engineer should be able to design, plan and build modern user interface components to enhance application performance and coach other teammates to achieve the same.

YOUR PROFILE

6+ years of professional experience in a similar position
Proven expert knowledge of TypeScript, JavaScript, CSS, HTML and front‑end languages
Quality‑focused mindset and deep passion for user experience and user interfaces
AI‑first mindset, embedding AI and automation into product architecture, engineering workflows, and decision‑making processes
Great knowledge of common frontend tools including React.js, Vite, Jest and Cypress.js
Great experience with browser‑based debugging and performance testing software
Excellent familiarity with git, npm, docker and Jira
Great troubleshooting skills
Good project management skills
Extensive experience in mentoring teammates in a respectful, empathic manner

YOUR RESPONSIBILITIES

Meeting with the development team to discuss user interface ideas and applications
Reviewing application requirements and interface designs
Identifying web‑based user interactions
Developing and implementing highly responsive user interface components using React concepts
Writing application interface codes using TypeScript following React.js workflows
Troubleshooting interface software and debugging application codes
Developing and implementing front‑end architecture to support user interface concepts
Providing automated unit, e2e and visual regression tests
Monitoring and improving front‑end performance
Documenting application changes and developing updates
Participating in code and technical design reviews
Writing and reviewing tasks and estimating workloads for yourself and others
Providing mentorship to team‑members

Benefits

Factor Eleven’s tech department is an in‑house tech start‑up/scale‑up and responsible for our SaaS product suite offering localized digital advertising to enterprises of all sizes and shapes. We’re powering the engine that Factor Eleven is successfully built upon and elevate the possibilities of our product on a daily basis. We’re fulfilling our ambitions as a top ad‑tech provider by continuously leveling up the quality and expanding capabilities of the entire platform, as well as our engineering and product organization.

Join our amazing team in our mission to move digital localized advertisement forward and enjoy the freedom, camaraderie and perks of our fully remote operations.

Our Perks & Benefits