Senior Frontend Optimizely

Engineering & Development
|
Senior
Senior
Czech Republic
Montenegro
Serbia
Slovakia
Spain
Europe
|
Czech Republic
Montenegro
Serbia
Slovakia
Spain
Europe
open
April 30, 2025

About the company

First Line Software works with some of the world's top businesses and organizations in industries like healthcare, data engineering, warehouse automation, retail digitalization, mobile app development, and e-commerce. Our projects are as varied as our people, and our people are as talented as they come. We prefer working as a transparent and supportive team, who shares our knowledge as well as our success.

Let's see what we can create together!

The project and your role

Building high-performance, user-centric digital experience websites aimed at delivering personalized content and seamless user journeys. The project leverages Optimizely for content management alongside a React-based frontend.

Responsibilities:

  • Develop and maintain frontend features of the web platform using React and Optimizely
  • Collaborate with backend developers, designers, and content managers to deliver high-quality digital experiences
  • Optimize application performance and ensure responsive, cross-browser compatibility
  • Write unit and integration tests to ensure code quality
  • Participate in code reviews and mentor junior developers
  • Continuously improve development processes and stay updated with industry trends
  • Ensure alignment with design and UX requirements for a seamless user experience

Your skills

  • 4+ years of experience in frontend development
  • Proven track record of building scalable and maintainable React applications
  • Experience working with Optimizely CMS for content-driven websites
  • Strong understanding of performance optimization techniques for web applications
  • Ability to write clean, modular, and well-documented code
  • Strong problem-solving skills and attention to detail
  • Good communication skills and ability to work collaboratively in a cross-functional team
  • English: Upper-intermediate or higher (for daily communication with international teams)

Must have:

  • React.js (advanced proficiency)
  • JavaScript (ES6+)
  • Experience with Optimizely CMS / Optimizely Content Cloud
  • HTML5, CSS3, SASS/LESS
  • RESTful APIs integration
  • Version control systems (Git)
  • Responsive and cross-browser development practices

Nice to have:

  • TypeScript
  • Optimizely Feature Experimentation (Full Stack)
  • Headless CMS integrations
  • Experience with CI/CD pipelines
  • Unit and integration testing (Jest, React Testing Library)
  • Familiarity with accessibility standards (WCAG)
  • Experience with cloud platforms (Azure, AWS)

What we can offer

The FLS difference

  • Our modern stack projects are the right mix of exciting and challenging
  • Gain access to our diverse range of training programs, courses, and certifications
  • Choose your work style - remote, on-site or hybrid in one of our stunning offices. We offer the freedom of flexible working hours
  • Enhance your language skills with our corporate English classes
  • Work from anywhere and explore the world with our Workation program
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Our Hiring Process

Getting started with us

Here's what you can expect when you send us your application

Step 0

Tech Talent Hunt

Be scouted or apply for your role

Step 1

Meeting & Connecting

Our first step to building lasting relationships

Step 2

Uncovering Potential

Your HR interview

Step 3

The Code Challenge or Technical Interview

It's time to show what you can do best!

Step 4

Client’s Interview

Demonstrating expertise to our future partners

Final

The Last Piece of the Puzzle

Job offer to finalize our tech team

Join our team of innovative thinkers

Let’s talk!

Have any questions? Fill out the form and our team will be in touch!

Let’s talk!

Have any questions? Fill out the form and our team will be in touch!