> Markdown version of [/jobs/ext/1179257-full-stack-engineer](https://www.wearedevelopers.com/jobs/ext/1179257-full-stack-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Engineer - **Company:** Clariness GmbH - **Location:** Berlin, Germany - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, Application Performance Management, Unit Testing, Code Review, Databases, Relational Databases, Github, PostgreSQL, MySQL, Node.Js, NoSQL, Svelte, Next.js, Software Engineering, TypeScript, Web Application Frameworks, ReactJS, Delivery Pipeline, Technical Debt, Backend, Vue.js, Containerization, AngularJS, Gitlab-ci, Kubernetes, Information Technology, Build Tools, Front End Software Development, NestJS, Docker, Jenkins - **Published:** July 4, 2026 - **Apply:** https://de.indeed.com/viewjob?jk=1fdbf5b468c92c91 ## About the Role * 2+ years of professional experience in JavaScript development, ideally with TypeScript. * Experience with modern frontend frameworks such as Next.js, React, Angular, Vue, or Svelte. * Experience building backend applications using technologies such as Node.js, Express, NestJS, or Next.js. * Solid understanding of relational databases such as PostgreSQL or MySQL; experience with NoSQL databases is a plus. * Experience with unit and integration testing (Jest, Karma, or similar) is a plus. * Familiarity with containerized environments (Docker, Kubernetes) is a plus. * Knowledge of CI/CD pipelines and build tools (GitLab CI, GitHub Actions, Jenkins) is a plus. * Degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience. Next.js or AWS certifications are a bonus. * Fluency in English. * Strong problem-solving, communication, and collaboration skills. * Proactive, quality-focused mindset with a passion for continuous learning and improvement. ## Description As a Full Stack Engineer, you will help build and enhance Clariness' digital platform supporting clinical trial recruitment and patient engagement. Working as part of a cross-functional product team, you will develop new features, improve application performance, and contribute to creating scalable, high-quality software that delivers value to our users. This role is ideal for someone who enjoys solving technical challenges, collaborating with multidisciplinary teams, and continuously improving both products and engineering practices. As a Full Stack Engineer, you would be responsible for: * Designing, developing, and maintaining new features for our Next.js-based clinical trial platform. * Taking full ownership of your code, features, and overall product quality. * Optimizing application performance across APIs, databases, frontend rendering, and accessibility. * Writing clean, maintainable, and well-tested code (unit, integration, and end-to-end). * Collaborating closely with engineers, designers, and product managers in an agile environment. * Participating in code reviews, technical discussions, and initiatives to reduce technical debt. * Contributing to scalable engineering practices and the continuous improvement of our applications., You may ask now, why should I work for you? Let us give you a few reasons - and you'll learn more during the process. * A varied and exciting job with a lot of personal responsibility in an international company, where you can develop and expand your skills. * Professional and personal development opportunities - incl. personal development budget. * Flexible working hours and mobile working. * Regular team events and open feedback culture. * A versatile field of activity and challenging projects. * A supportive and open company culture, providing the opportunity to collaborate with a diverse and professional team. * Impact healthcare by accelerating medical innovation through improved access to clinical trials, potentially bringing needed treatments to patients faster. ## Related Videos - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [MySQL Protocol Features You Should Be Aware Of](https://www.wearedevelopers.com/videos/100267-mysql-protocol-features-you-should-be-aware-of) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [NoSQL Data Modeling for Front-end Developers](https://www.wearedevelopers.com/videos/297-nosql-data-modeling-for-front-end-developers) - [Docker build without Docker](https://www.wearedevelopers.com/videos/100114-docker-build-without-docker) ## Related Articles - [Frontend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/195-frontend-developer-salary-in-germany-2023) - [Fullstack developer salary in Germany [2023]](https://www.wearedevelopers.com/magazine/197-fullstack-developer-salary-in-germany-2023) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [The Biggest German Tech Companies](https://www.wearedevelopers.com/magazine/424-the-biggest-german-tech-companies)