Senior Full Stack Developer

Accountabilities:: As a Senior Full Stack Developer, you will take ownership of the architecture, implementation, and continuous improvement of scalable e-commerce software solutions. Your responsibilities will include: Planning, architecting, and developing Shopify applications, plugins, and API integrations. Building full-stack solutions using React, Next.js, Node.js, Express, and TypeScript. Integrating third-party systems, including ERP, payment, CRM, and logistics platforms, through REST and GraphQL APIs. Ensuring application performance, code quality, security, maintainability, and scalability. Developing responsive, accessible, and user-friendly interface components. Conducting code reviews, debugging, and implementing unit, integration, and end-to-end testing. Building and maintaining CI/CD pipelines and contributing to efficient DevOps workflows. Producing clear technical documentation and maintaining reliable development processes. Collaborating with product, design, and quality assurance teams to develop products from concept to launch. Mentoring junior developers, sharing technical knowledge, and promoting engineering best practices. Contributing to architectural decisions and the evolution of the technical roadmap. Requirements: We are looking for an experienced, technically strong, and proactive developer who takes pride in writing clean code and building reliable software. The ideal candidate will bring: At least five years of professional full-stack development experience. Strong proficiency in JavaScript, TypeScript, React, Next.js, Node.js, and Express. Solid database experience with MongoDB, PostgreSQL, MySQL, or comparable technologies. Practical experience with Git, CI/CD pipelines, Docker, and modern DevOps workflows. A strong understanding of API design, UX/UI principles, application security, and performance optimization. Knowledge of authentication and security mechanisms, including OAuth, JWT, and CORS. Experience with Shopify app development, including Polaris, webhooks, OAuth, and GraphQL APIs, is an advantage. A structured, independent, and solution-oriented approach to problem-solving. Strong organizational skills and the ability to manage complex development workflows. Excellent collaboration and communication skills, with a willingness to share knowledge and take responsibility. Native-level German proficiency and good written and spoken English. An entrepreneurial, results-driven mindset and a willingness to take initiative and go the extra mile. Benefits: Competitive annual salary: €50,000–€80,000. Performance-based compensation: Fixed salary combined with performance-dependent commission. 30 days of annual leave , plus your birthday and Christmas off. High ownership and autonomy: Take responsibility for meaningful technical decisions and projects. Modern equipment: Access to high-quality Apple hardware. Collaborative team environment: Work alongside motivated colleagues in a performance-oriented setting. Flat organizational structure: Benefit from short decision-making processes and direct communication. Team events and off-sites: Opportunities to connect with colleagues and strengthen team collaboration. Professional growth: Contribute to the technical roadmap, exchange knowledge, and mentor other developers. Permanent employment contract offering long-term professional stability.