Senior Front End (React.js) Engineer

Vacancy details
Software Engineering
JavaScript Engineer (React)
Senior
Bulgaria, 
Sofia
Hybrid

Dive deep into Digital! For 20 years Intellias has been developing top-tier digital solutions for the world’s leading companies, keeping them in line with the latest technology trends. Join in and provide innovations for the future!

What project we have for you

The product we develop is one of the world’s largest SaaS digital advertising platforms, managing nearly $5B in ad spending with 700+ brands worldwide.
The client’s leading end-to-end technology and outstanding customer service help brands such as Walmart, FanDuel, L’Oreal, Warner Bros. Discovery, Nestle, and Disney/ESPN to expand their ads reach, ignite creativity, and gain invaluable ad insights across the largest media platforms, including Facebook, Instagram, Snap, Pinterest, TikTok, and Google.

What you will do

  • Development of highly robust and scalable server-side applications and services.
  • Writing advanced application interface codes using JavaScript following React.js/Typescript workflows and ensuring high performance and best user experience.
  • Translating complex designs and wireframes into high-quality code and building reusable components and front-end libraries for future use.
  • Monitoring and improving front-end performance, ensuring UI/UX designs meet usability guidelines, and optimizing components across various devices and browsers.
  • Collaborating with cross-functional teams, product teams, and graphic designers to develop well-structured and flexible architecture, along with the APIs to support it.
  • Mentoring junior and middle developers, driving peer code reviews, and helping drive development and software engineering best practices for the team.
  • Documenting application changes, developing updates, maintaining existing React systems, and designing and developing new custom components to meet complex project requirements.
  • Optimize and tune code for performance, maintainability, and scalability.
  • Implement and champion Agile development methodologies.

What you need for this

  • 5+ years of experience in software development using ReactJS
  • Proficient in building module-based applications and shared UX libraries (following Atomic design or similar approaches)
  • Proficient with git-flow
  • Expertise in writing efficient, secure, well-documented, and clean JavaScript code
  • Expertise in React, Hooks, HOC, Render Props, and advanced performance optimization techniques
  • Ability to review code and provide structured feedback
  • Expert understanding of Agile methodologies
  • Excellent communication skills, ability to stay organized, and push projects forward

Nice to have:

  • Experience with Typescript will be a huge plus
  • Experience in project domain area or designing similar relevant products
  • Understanding of REST, WebSocket, PostgreSQL, RabbitMQ, Redis
  • Interface Animation
  • Figma, Radix, TailwindCSS
  • Relevant IT or Design education, courses, and/or certifications

What it’s like to work at Intellias

At Intellias, where technology takes center stage, people always come before processes. By creating a comfortable atmosphere in our team, we empower individuals to unlock their true potential and achieve extraordinary results. That’s why we offer a range of benefits that support your well-being and charge your professional growth.
We are committed to fostering equity, diversity, and inclusion as an equal opportunity employer. All applicants will be considered for employment without discrimination based on race, color, religion, age, gender, nationality, disability, sexual orientation, gender identity or expression, veteran status, or any other characteristic protected by applicable law.
We welcome and celebrate the uniqueness of every individual. Join Intellias for a career where your perspectives and contributions are vital to our shared success.

Skills

HOC
Hooks
React
UX_libraries

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