is an online service provided by Expert Systems AG with Remo Fyda as CEO and has become one of the best-known online platforms for qualified customer feedback and review aggregation in the region of Germany, Austria, and Switzerland. More than 40,000 freelancers, entrepreneurs and large companies use's online surveys to collect customer feedback. As of May 2017, the ProvenExpert platform is also available to global users in English. Our team of concept and graphic designers, web developers and product and marketing professionals work on the development and expansion of our range of online services. For our office in Krakow (Poland) we are looking for a Senior Frontend Developer (m/f/d) in Krakow (Poland) Your future responsibilities Develop and maintain our current systems Plan and implement new frontend features Transfer the current design in a new frontend system Lead a small team and act as a connector between the developer teams in Berlin (Germany) and in Krakow (Poland) Your profile At least three to five years of experience working as a Frontend Developer Expert experience in HTML5, CSS3 and JavaScript Proficient understanding of Grunt and Sass Experiences with different two-way bindings and responsive web design (e.g. Vue, Angular or React and Bootstrap, Grid or Flex-Box) PHP skills would be desirable You have proven leadership skills and you know how to motivate and support your team members You have very good communication skills and you work proactively to ensure that working processes are smooth and efficient You love a good challenge and enjoy finding creative solutions to problems You are a team player, can work independently, and strive to achieve high-quality work Your English is very good so you can read, write and discuss tasks within an international team; German is a plus What we offer You choose your hardware, which suits you best (PC/ Mac and desktop/notebook) You have the opportunity to take over responsibility, develop your skills according to your interests and to try things out A great team of PHP freaks, creatives, database tamers, social media junkies and concept gurus as well as many other people is waiting for you Work-Life balance is important for us - we care about correct time recording (no overtime!) And last but not least: attractive pay, regular team events, parties, fresh fruit, snacks and all-you-can drink coffee/tea Sounds like the right fit for you? Then send your complete application with your earliest availability to start, salary expectations and a sample of your best work as a PDF file to We are looking forward to hearing from you.