• 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.

• Build and evolve the systems that enable travel specialists to design, configure, and launch complex travel products at scale. • Transform destinations, itineraries, flights, hotels and services into structured, reliable, and sellable products. • Ensure flexibility and accuracy in product configuration while maintaining operational efficiency and long-term scalability. • Develop and improve capabilities that support smart departures, pricing strategies, booking breakdowns, payments, refunds, and wallet flows. • Safeguard financial correctness across the full product lifecycle, from configuration to checkout and post-booking operations. • Design systems that directly impact revenue performance and margin optimization. • Build internal platforms and tools that empower Product, Finance, and Operations teams to work autonomously and efficiently. • Increase reliability and reduce manual intervention in calendar management, flight configuration, and payment-related processes. • Continuously improve system robustness, reducing operational risk and scaling complexity without increasing overhead. • Work closely with the whole team to refine problems before writing code. • Use data to validate assumptions, measure business impact, and continuously improve solutions. • Actively participate in shaping product decisions, not just implementing tickets.

• Design, build, and own product features and backend services that support our growing customer base • Lead the technical implementation of complex initiatives, from discovery through production and iteration • Build scalable systems to process and analyze large cloud environments (e.g. customers with 1M+ AWS resources) • Design and evolve integrations with cloud platforms, MDM systems, and third-party services • Improve system performance, reliability, and scalability as we grow into enterprise-level workloads • Collaborate closely with Product and stakeholders to translate real customer and compliance needs into robust technical solutions • Review code, provide thoughtful feedback, and raise the overall quality bar of the team • Mentor other engineers through pairing, design discussions, and knowledge sharing • Actively contribute to shaping our engineering standards, architecture, and culture