• Diseñar y construir aplicaciones web de extremo a extremo, cubriendo frontend, backend y nube. • Desarrollar y mantener APIs y microservicios escalables. • Implementar mecanismos robustos de autenticación y autorización. • Construir interfaces de usuario accesibles y responsivas con alto rendimiento. • Desplegar, monitorear y mantener aplicaciones en entornos de nube. • Colaborar con equipos multifuncionales.

• Design, develop, and maintain Java-based applications using Spring Boot & Spring Security. • Work with relational databases (e.g., MySQL, PostgreSQL, Oracle) and optimize queries. • (Preferred) Experience with Camunda BPM for workflow automation. • Develop and integrate RESTful APIs and microservices. • Knowledge of JavaScript frameworks (React) for front-end integration. • Implement best practices for code quality, testing (JUnit, Mockito), and CI/CD pipelines. • Troubleshoot, debug, and optimize application performance. • Collaborate with DevOps teams for deployment and monitoring. • Participate in Agile/Scrum processes (sprints, stand-ups, retrospectives).

• Design and develop scalable, secure, and reliable payment processing services. • Collaborate with cross-functional teams to integrate payment gateways and financial services. • Optimize system performance and troubleshoot complex issues in production environments. • Ensure PCI compliance and implement industry-standard security practices.

Role Description Become part of Fairmas as a Full-Stack Software Developer (all genders) and help shape the future of our SaaS platform. From intuitive frontends to robust backend services, you'll build features end-to-end, solve real-world challenges, and contribute to software used by international hotel teams. Location: Wherever you are – in Berlin/Brandenburg | Full-time or part-time | Monday to Friday | Work-life balance guaranteed. Have you already built software through internships, working student roles, open-source contributions, freelance work, or personal projects? Do you enjoy solving technical challenges, shipping features, and working across the full stack in a collaborative SaaS environment? Then Fairmas is the right place for you. Qualifications - Practical software development experience beyond university coursework, e.g. via internships, working student, freelance work, open-source contributions, research, or personal projects. - Comfortable taking responsibility for your code and the features you build. - Effective practitioner of AI-assisted development, balancing rapid iteration through AI tools with disciplined engineering decision-making. - Hands-on experience with React, TypeScript, .NET, and relational databases, or equivalent experience with comparable technologies. - Familiar with modern development tools, workflows, and engineering practices. - Comfortable turning requirements into working, tested, and refined solutions. - Passion for clean, maintainable, and scalable software. - Team player who enjoys exchanging ideas, giving and receiving feedback, and building solutions together. - Able to explain technical concepts clearly and work effectively with both technical and non-technical colleagues. - Confident English for day-to-day collaboration in an international tech environment. Requirements - Leverage AI-powered development tools & workflows to accelerate delivery while maintaining high standards for code quality, security, testing, maintainability, and system architecture. - Design, build, and maintain modern web applications across frontend and backend systems. - Develop user-facing applications using React, TypeScript, and modern component-based architectures. - Build and evolve backend services and APIs using .NET / C# in a distributed system landscape. - Work with relational databases, with a strong preference for PostgreSQL experience. - Contribute to scalable, resilient, and highly available systems; experience with PostgreSQL clustering technologies (e.g., Patroni) and infrastructure set-ups are advantageous. - Analyze, debug, review, and improve both existing and AI-generated code to ensure reliability and performance. - Take end-to-end responsibility for delivering and maintaining solutions, proactively identifying issues, asking effective questions, and driving work forward independently. - Apply clean code principles, automated testing practices, version control (Git), and modern software development workflows. - Collaborate closely with stakeholders to understand user needs and translate them into valuable product capabilities. - Participate actively in logical, architectural and technical discussions, as well as knowledge sharing to support a high-performing engineering culture/team. - Contribute to ongoing learning, experimentation, and process improvement within an experienced product-focused engineering organization. Benefits - No weekend work, no shifts, no overtime. - Fair pay and a safe working environment. - Work remotely or from our modern Berlin office – whichever suits you best. - Many of us come from the hotel industry ourselves. - Help hotels around the world stay economically successful. - Our offices are eco-friendly and perfectly connected. - We subsidize your Deutschlandticket. - Through team events and personal development – we support what makes you unique. Get in Touch! Ready to Join Us? Send us your CV – feel free to include your earliest possible start date. If you have any questions, reach out to us at hr@fairmas.com – we’re happy to help. You don’t meet every single requirement or have gaps in your resume? No problem! Apply anyway – what matters most to us are your motivation, values, and personality.