Senior Front end developer

AdStart Media (www.adstartmedia.com) is a technology-driven company active in digital advertising and mobile payments, well-established and rapidly expanding globally. As an international performance network, we are proud to partner with global brands, publishing houses, media buyers and app developers. We are young, fun, collaborative and very social! 

At our core, we are a performance driven culture that believes growth comes from the power of meaningful connections. We value given thoughts and opinions to significantly contribute during a rapid expansion period and do meaningful work.

We are offering an immediate opening for a Senior Front End Developer based in our Sofia office. The vacancy is ideal for a strong creative capability both conceptually and in the development process. The right candidate must have strong knowledge of web programming techniques with a keen eye for details and high standards for design, code quality, and efficiency. You must have commercial awareness, be able to work as part of a team and be able to communicate at all levels as well across all functions. We need someone who can take ownership of entire features, quickly shift gears between projects, and never have any trouble finding more work to do.

YOUR MAIN DUTIES: 

• Work closely with designers and development team for technical build-out with visual and content dynamics for websites and landing pages that emphasize usability and best practices
• Manage the delivery of multiple complex simultaneous development projects from design through to release
• Provide ongoing maintenance and troubleshooting of the interface code when bugs and/or errors are encountered
• Stay abreast of industry issues, trends and inventory solutions, and recommend improvements to the management and development team
• Provide technical leadership to junior team members through coaching and mentorship

Language & Communication

• Fluency in English is required for verbal and written communication

Technical Skills

• 3–5 years of experience in front-end web development
• Strong proficiency in:

  • HTML, CSS, JavaScript

  • ReactJS/NextJS and TypeScript or Dart

• Experience converting designs from Figma, Zeplin, or Photoshop (PS) into functional UI components
• Solid understanding of cross-browser compatibility and responsive web design
• Experience with API integration and validating API responses through testing
• Familiarity with unit testing using modern testing frameworks (e.g., Jest, React Testing Library, Mocha, etc.)

Nice to Have

• Experience with Flutter is a plus

Testing & Quality

• Ability to write and maintain unit tests to ensure component-level quality and reduce regressions

Team & Process

• Experience working within Agile development teams following Scrum methodologies
• Ability to lead and mentor junior front-end developers, including code reviews and technical guidance
• Strong organizational skills with attention to details
• Ability to take initiative and work independently, with minimal supervision when needed

WHAT WE OFFER:

• A workplace with high energy, flat hierarchy, positive attitude, and growth you would expect from a startup coupled with all of the security of an established company 
• Flexible work life balance 
• Opportunity to travel and work from a variety of office locations 
• Competitive salary and benefits
• Individual tailor-made career progression plan 
• Multitude of employee training programs 
• Team-building activities