Senior Backend / Full-Stack Developer (f/m/x)

Are you a versatile developer ready to build something extraordinary? Join us as our software engineer and spearhead the creation of a cutting-edge platform.

Pactos is a venture-backed B2B SaaS start-up based in Munich. We’re revolutionizing the external workforce management with an AI-powered operating system. Used by leading corporates, Pactos help streamline the source-to-pay process with staffing providers in a compliant, scalable, and transparent way. Thus, our customers excel in operation efficiency and re-gain full workforce visibility.

• Architect our Backend: Independently design, develop, and optimize modern web applications with a focus on the backend.
• End-to-End Ownership: Manage the complete development lifecycle - from requirements analysis to testing and deployment.
• Cross-Functional Collaboration: Work closely with design, product, and other engineering teams to continually refine the system architecture.
• System Optimization & Scaling: Establish best practices to ensure code quality and maintainability.
• Technical Leadership: Contribute to technical decisions, perform code reviews, and mentor junior developers to foster a culture of innovation, knowledge sharing and excellence.

• 5+ years of professional experience in full-stack / backend development with a strong command of modern back-end technologies (e.g., Express.js / Node.js, Python)
• Demonstrated ability to build scalable, high-performance web applications and implement effective optimization strategies
• Experience in agile development methodologies, CI/CD pipelines, and automated testing to ensure rapid, reliable delivery
• Proficiency in backend frameworks and the integration of RESTful APIs and GraphQL
• Familiarity with relational databases (e.g., PostgreSQL) and caching techniques
• Excellent analytical and troubleshooting abilities with a passion for clean, maintainable code
• Strong interpersonal skills with a proven track record of cross-functional collaboration and glue work
• Highly motivated and proactive, eager to take ownership of the full domain and follow through in a fast-paced, aspiring startup environment
• Fluency in English and good command of German

• Fair comp + ESOP: Competitive salary plus meaningful equity
• True Ownership: You’ll be among the first, well-experienced developers. Everything is yours to shape. Define our product from day one.
• Speed: We make decisions in hours, not weeks. No politics. No BS.
• Colleagues you’ll want to work with: Pragmatic, product-obsessed, and committed to winning - backed by great early customers & advisors
• Modern stack, flexible setup: hybrid, outcome-driven, and lots of fun (e.g., Oktoberfest)

Tell us why this role is exciting for you and link some work references you're proud of. Let’s build something bold!