Senior Fullstack Developer (Javascript + Node.js)

<p>Established in 1997, Softeq was built from the ground up to specialize in new product development and R&amp;D, tackling the most difficult problems in the tech sphere. Now we've expanded to offer early-stage innovation and ideation plus digital transformation business consulting. Our superpower is to deliver all of this under one roof on a global scale. So let's get started and build a better future together!</p><p></p><p dir="ltr"><strong>Locations/type of contract:</strong><br/></p><p dir="ltr"><strong>Lithuania (employment contract, hybrid/remote)<br/></strong></p><p dir="ltr">OR<br/></p><p dir="ltr"><strong>Poland/other EU country (<strong>B2B contract directly with Softeq</strong>, fully remote) </strong></p><p dir="ltr"><strong><br/></strong></p><p dir="ltr"><strong>Responsibilities</strong><strong><strong><br/></strong><br/>Frontend (React):</strong><br/></p> <p dir="ltr"></p><p dir="ltr">Build modern, responsive, and accessible UI components using React / Next.js</p><p></p><p dir="ltr"></p><p dir="ltr">Implement clean, modular front-end architecture using hooks and component libraries</p><p></p><p dir="ltr"></p><p dir="ltr">Optimize rendering performance and frontend UX across devices</p><p></p><p dir="ltr"></p><p dir="ltr">Collaborate with designers to turn UI/UX into functional interfaces<strong><br/></strong></p><p dir="ltr"></p><p dir="ltr"><strong>Backend (Node.js):</strong></p><p></p><p dir="ltr"></p><p dir="ltr">Design and implement RESTful or GraphQL APIs using Node.js / Express / Nest.js</p><p></p><p dir="ltr"></p><p dir="ltr">Build scalable microservices with proper separation of concerns</p><p></p><p dir="ltr"></p><p dir="ltr">Work with relational and NoSQL databases (PostgreSQL, MongoDB, etc.)</p><p></p><p dir="ltr"></p><p dir="ltr">Implement authentication, authorization, and role-based access control</p><p></p><p dir="ltr"></p><p dir="ltr">Integrate with third-party APIs and services (payments, notifications, etc.)</p><p></p><p dir="ltr"></p><p dir="ltr">Ensure robust error handling, logging, and testing</p><p dir="ltr"></p><p dir="ltr"><strong>Requirements</strong><br/></p><p></p><p dir="ltr"></p><p dir="ltr">5+ years of experience in fullstack web development</p><p></p><p dir="ltr"></p><p dir="ltr">Deep knowledge of JavaScript/TypeScript across both frontend and backend</p><p></p><p dir="ltr"></p><p dir="ltr">Proficiency with React (or Next.js) and related frontend tooling (Webpack, Vite, etc.)</p><p></p><p dir="ltr"></p><p dir="ltr">Strong backend skills in Node.js and one or more frameworks (Express, Nest.js, etc.)</p><p></p><p dir="ltr"></p><p dir="ltr">Solid understanding of database design and query optimization (PostgreSQL, MySQL, MongoDB)</p><p></p><p dir="ltr"></p><p dir="ltr">Experience with API design, authentication flows, and JWT/OAuth2</p><p></p><p dir="ltr"></p><p dir="ltr">Experience with Git, CI/CD, and automated testing</p><p></p><p dir="ltr"></p><p dir="ltr">Strong architectural and problem-solving skills</p><p></p><p dir="ltr"></p><p dir="ltr">Ability to communicate clearly, collaborate cross-functionally, and mentor others</p><p></p><p dir="ltr"></p><p dir="ltr">Very good English language written and verbal communication skills (min. B2 level)<br/><br/></p><p dir="ltr"></p><p dir="ltr"><strong>Nice to have</strong></p><p></p><p dir="ltr"></p><p dir="ltr">Experience with Cloud platforms (AWS, GCP, Azure)</p><p></p><p dir="ltr"></p><p dir="ltr">Experience with Docker, containerized deployments, or Kubernetes</p><p></p><p dir="ltr"></p><p dir="ltr">Familiarity with serverless architecture (AWS Lambda, Firebase Functions)</p><p></p><p dir="ltr"></p><p dir="ltr">Exposure to microfrontend or monorepo setups (Turborepo, Nx)</p><p></p><p dir="ltr"></p><p dir="ltr">Familiarity with Agile processes, Jira, Scrum/Kanban boards</p><p></p><ul> </ul><p dir="ltr"><strong><br/></strong></p><p dir="ltr"><strong><br/></strong></p>