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.!

Project Information:

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 responsive, user-friendly web interfaces using React.js and integrate them with Optimizely CMS
  • Collaborate with designers, UX specialists, and back-end teams to deliver seamless, consistent digital experiences
  • Implement reusable components and optimize front-end performance for speed and scalability
  • Build headless or hybrid front-end solutions using Optimizely's APIs and services
  • Ensure compliance with accessibility (WCAG), SEO best practices, and cross-browser compatibility
  • Maintain clean, maintainable, well-documented code and participate in code reviews
  • Contribute to technical discussions, architectural decisions, and innovative solution design
  • Stay up to date with modern front-end trends, tools, and Optimizely advancements

Requirements:

  • 3+ years of professional front-end development experience
  • Strong expertise in React.js, JavaScript (ES6+), HTML5, 

    CSS3, and responsive design principles
  • Hands-on experience with Optimizely CMS (minimum 1 year, headless or traditional setup)
  • Solid understanding of RESTful API integration and JSON-based data handling
  • Experience with modern front-end build tools (Webpack, Vite, etc.)
  • Familiarity with version control (Git) and Agile development processes
  • Passion for clean code, performance optimization, and pixel-perfect implementation
  • Excellent communication and collaboration skills

Must have:

  • React.js (advanced proficiency)

  • JavaScript (ES6+)

  • Experience with Optimizely CMS (headless)

  • HTML5

  • CSS3

Nice to have:

  • Experience with TypeScript
  • Familiarity with Optimizely Content Delivery API and Personalization features
  • Knowledge of GraphQL and modern state management libraries (Redux, Zustand, etc.)
  • Exposure to testing frameworks (Jest, Cypress)
  • Understanding of headless CMS architectures and JAMstack principles
  • Optimizely or front-end development certifications

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

Location

Belgrade, Serbia

Job Overview
Job Posted:
3 days ago
Job Expires:
Job Type
Full Time

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