Senior Backend Engineer

<div class="content-intro"><p><strong>Allow us to introduce ourselves</strong></p> <p>Hello there! We’re Appinio, a global market research company that combines an AI-powered insights platform with expert consultancy. On a mission to make the world a little more fact-based, we help companies understand how consumers think and make smarter decisions.</p> <p>We started out in Hamburg back in 2014, but we’re now humbled to call the world our playground, with over <strong>260 employees</strong> spread across <strong>13 countries </strong>(we’re remote-first), 2600+ international clients, delivering research from <strong data-stringify-type="bold">+190 markets,</strong> globally.</p> <p>Want to be a part of the Appinio movement? <strong>🚀</strong></p> <p><span data-preserver-spaces="true">Here at Appinio, we value <strong>transparency</strong> <strong>in our recruitment process</strong>, and we've created a blog to share what to expect during each step of our journey together:</span><strong><span data-preserver-spaces="true"><em data-stringify-type="italic"> </em></span><span data-preserver-spaces="true"><a class="c-link c-link--focus-visible" href="https://www.appinio.com/en/blog/life-at-appinio/appinio-recruitment-process" target="_blank" data-stringify-link="https://www.appinio.com/en/blog/life-at-appinio/appinio-recruitment-process" data-sk="tooltip_parent">here</a></span></strong></p></div><div class="role"> <div class="job-ad-editable job-ad-editable job-ad-editor" data-content="6454830"> <p><strong>Your mission as a Senior Backend Engineer</strong></p> <p>We are looking for a passionate (<strong>Senior)</strong> <strong>Backend Engineer (m/f/d)</strong> to join our amazing backend team. In this role, you will be responsible for developing new features and enhancing our existing code base using NodeJs, Express, and MongoDB.  </p> <p><strong>What you’ll be doing</strong></p> <ul> <li>Design and maintain server-side applications and database architecture.</li> <li>Collaborate with front-end developers for a seamless user experience.</li> <li>Regularly review and improve code and system efficiency.</li> <li>Develop and deploy reusable, testable code and automated tests</li> </ul> <p><strong>You will thrive in this role if</strong></p> <ul> <li>You have at least 3 years of hands-on experience with Node.js, along with strong proficiency in TypeScript and Express.</li> <