Senior React.JS Developer

Job Offer: Front-End Developer (React.js / Next.js) Location: Sofia, Bulgaria Company: Kollektiv IT Contract Type: Full-time, On-site (Hybrid possible after several months of collaboration)About Us Kollektiv IT is a fast-growing tech company based in Sofia, Bulgaria, specializing in innovative and scalable digital solutions. We pride ourselves on fostering a collaborative and high-performing environment where every team member has a real impact.Position Overview We are looking for a Front-End Developer with strong experience in React.js and solid knowledge of Next.js to join our team in Sofia. The ideal candidate is passionate about building sleek, efficient, and user-friendly web applications, and thrives in a dynamic and fast-paced environment.Responsibilities:Develop and maintain high-quality web applications using React.js and Next.js.Collaborate closely with backend developers, designers, and product managers to deliver seamless user experiences.Write clean, maintainable, and scalable code.Participate in code reviews and contribute to continuous improvement.Optimize applications for maximum speed and scalability.Requirements:Proven experience as a Front-End Developer (3+ years preferred).Strong proficiency in React.js and Next.js.Solid understanding of JavaScript (ES6+), HTML5, CSS3, and TypeScript.Experience with REST APIs or GraphQL integration.Familiarity with version control systems (Git).Good understanding of responsive design and UI/UX principles.English proficiency is a strong asset.What We Offer:Full-time employment with a competitive salary.On-site position in Sofia with partial remote work possible after several months.Opportunity to grow within a talented and international team.Supportive and innovative work culture.How to Apply: Send your CV and portfolio (if available) to jobs@kollektiv-it.com with the subject line: 👉 “Front-End Developer Application – [Your Name]”