Senior Front End Developer

Software EngineeringHybrid Remote, Sofia, Bulgaria

Progress is an experienced, trusted provider of products designed with customers in mind, so they can develop the applications they need, deploy where and how they want, and manage it all safely and securely. We take pride in what we do, always valuing the whole person—at work and in life. Our diverse life experiences enrich our culture because people power progress. And as Senior Front End Developer in Sofia, you can join us in doing what we do best: propelling business forward. 

The product Sitefinity is an ASP.NET Content Management System delivering power without complications. Designed with both usability and extensibility in mind, Sitefinity is engineered to make managing a website a positive, empowering experience. Because it’s built on a cutting-edge codebase, Sitefinity is best equipped to meet the long-term needs of today’s businesses, including tackling the fast-paced world of mobile. 

The Frontend developers work closely with Dev teams, UX team, and Product Managing team to deliver and ensure the good quality of the backend portals UI and Sitefinity Component Framework. The team is committed to following and integrating new front-end technologies and practices into our everyday work and the Sitefinity products. 

What you will do: 

  • Take responsibility for building new functionalities, enhancing, and maintenance of existing ones. 
  • Ensure consistent UI/UX and compatibility that follow the same principles and patterns across all screens and devices 
  • Implement designs and style guides into functional user interfaces, ensuring high performance and compatibility during the development lifecycle. 
  • Write clean, maintainable, and readable code. Adhere strictly to team coding quality standards. Participate in code reviews and provide guidance to drive personal and code quality improvements. 
  • Analyze troubleshoot and fix front-end issues including performance and security problems, determine root cause 
  • Collaborates with UX Designers. Engineering team and Product Managers on solving UI problems while ensuring the UI follows the wireframes.  
  • Constantly expand your knowledge and encourage the use of best practices, new technologies, and techniques. 
  • Ensures that the established product front-end testability practices are strictly followed. 
  • Create product documentation, demos and other resources. 
  • Identify and extract common assets and tools that can be reused across multiple projects to reduce maintenance, improve consistency and code reuse. 

What you need to be successful in the role: 

  • Strong skills in JavaScript and Angular and other frontend frameworks like React 
  • Strong skills in HTML, CSS, Sass, Bootstrap 
  • Experience developing REST based web applications and implementing UI designs 
  • Experience with build tools such as Webpack 
  • Experience with packaging tools – NPM, NuGet 
  • Solid knowledge of the programming concepts (OOP, data structures, and algorithms) 
  • Good understanding of key principles in UX / Usability design. 
  • Understanding of Accessibility, mobile and responsive design 
  • Understanding of the continuous integration process and building infrastructure for the specific product/team 
  • Experience building large-scale, rich, interactive, web interfaces  
  • Ability to learn and adapt quickly as well as work within a team
  • Advanced written and verbal English language skills 
  • A university degree in Computer Science or a related field is considered an advantage. 

What we offer in return is the opportunity to join a talented team of bright and motivated people and to also enjoy:


  • Generous remuneration package
  • Employee Stock Purchase Plan Enrollment

Vacation, Family, and Health:

  • 30 days paid annual vacation
  • An extra day off for your birthday
  • 2 additional days off for volunteering
  • Premium healthcare and dental care coverage
  • Additional pension insurance
  • Well-equipped gym on-site with CrossFit equipment and a climbing wall
  • Co-funded Multisport card
  • Daycare Center for your little ones
  • Flexible working hours and generous work-from-home allowance
  • Free underground parking with a designated space for bikes and electric scooters

And most importantly a great company culture with wonderful colleagues to learn from and collaborate with!


Together, We Make Progress

Progress is an inclusive workplace where opportunities to succeed are available to everyone. As a multicultural company serving a global community, we encourage a wide range of points of view and celebrate our diverse backgrounds. Our unique combination of perspectives inspires innovation, connects us to our customers and positively affects our communities. It is only by working together and learning from each other that we make Progress. Join us!