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

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YOUR MISSION

We are looking for a
- 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 Type
Script, Graph
QL, 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 Saa
S 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 Type
  Script, Java
  Script, 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 Type
  Script 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 Saa
S 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

• Transparent, above‑market salaries
• 100%-remote within Europe
• Clear expectations and regular feedback
• Flexible work‑hours
• Be part of a fast‑growing, highly‑skilled team
• In‑person department and company events
• Home office, co‑working space and work‑together allowance
• Personal and professional development fund

Seniority level

• Mid‑Senior level

Employment type

• Full‑time

Industries

• IT Services and IT Consulting

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