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Callstack was founded in 2016 by Mike Grabowski and Anna Lankauf. Our company provides top cross-platform consultancy & development in React.Js and React Native. We co-create the technology and collaborate with the Meta team on shaping the technology as core contributors and innovators. Our main goal is to drive and accelerate software development innovation. To achieve that, we follow our major rule: We don’t follow best practices. We set them Callstack also organizes React Universe Conf - the only community- driven and fully dedicated to React Native conference in Europe. What is unique about working at Callstack? You will work with the best React Native experts on applications used by millions worldwide. You can develop your own ideas in our R&D program. If you want to bring your visions to life - Callstack will support you. You have a possibility to contribute to our projects in Open Source like React Native Paper, Linaria, RN Testing Library etc. There are plenty of possibilities to showcase your expertise: You can speak at our React Universe Conf, be featured in our blog, or The React Native Show podcast episode. You are the one to decide in which area you want to grow, you’ll have an individual self-development budget to upgrade your soft skills, managing skills or become a Mentor in the future. Join us and work with the TOP Silicon Valley and Fortune 500 companies in the USA As a Senior React Native Developer you will: Act as a technology consultant for our clients and help them build great products for multiple platforms Drive the development process by providing expertise in cross-platform technologies and solving the most complex programming issues Collaborate with development teams, CTOs, Project Managers, and Product Owners from all around the world Have multiple possibilities to contribute to the Open Source community by working on projects led by our CTO, React Native Core Contributors, and our Senior Developers Be one step ahead exploring technologies of tomorrow, being a part of our R&D activities Simply have fun REQUIREMENTS You are the right candidate if you are: A JavaScript expert with extensive knowledge and expertise in modern frameworks and libraries Skilled in and enthusiastic about React.Js and React Native Experienced in web or mobile app development (3 years) Driven towards learning new technologies and knowledge-sharing initiatives Able to quickly gain new technical expertise Fluent in English (B2) Passionate about the open source mission (documented contributions to any open source project would be a huge plus) A great communicator and team player Proactive and self-driven Fun to work with :) Why work with us? Because you can: Realize your potential in our R&D program Work on software used by millions Take part in our Open Source projects Grow in your unique expert role Code with the top experts and community leaders Showcase your expertise by speaking at our conference, being featured in our blog or podcast episode Co-create and shape core technology Join the React Native community Develop soft skills What we offer: 24 paid days off & 30 days paid sick leave for B2B contractors Fully-covered life insurance Private healthcare for you and your family Free access to mental health platform - Helping Hand Multisport Card or monthly allowance for other sports activities Individual Wellbeing & Development Budget Monthly lunch allowance Accounting costs refund for B2B contractors Flexible working hours and fully remote work possibility Cool office in Wrocław city center Magnificent team events and activities Company-wide workation and team building workshops Top-notch hardware - Apple devices Free entry and possibility to participate in the biggest RN conference in the whole Europe ( React Universe Conf )