Senior Full-Stack Engineer; Backend-Focused; f​/m​/x München, Deutschland Angestellte​/r Softwar

Stellenbezeichnung: Senior Full-Stack Engineer (Backend-Focused) (f/m/x) München, Deutschland Angestellte/r Softwar[...] 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.TasksArchitect our Application: Design and build modern web applications using Type Script and NestJS , with a strong focus on scalable backend systems, complex domain modeling, and multi-tenant SaaS architecture.End-to-End Ownership: Take full ownership of features from requirements through implementation, testing, and ensuring reliable operation in production.Cross-Functional Collaboration: Work closely with product, design, and engineering to continuously evolve a multi-tenant SaaS platform.System Optimization & Scaling: Drive best practices for performance, scalability, and maintainability in a growing system.Technical Excellence & Mentorship: Contribute to architectural decisions, conduct code reviews, and mentor engineers to foster a high-quality engineering culture.Requirements3+ years of professional experience in full-stack / backend developmentDemonstrated ability to build scalable, high-performance web applications and implement effective optimization strategiesProficiency in modern backend frameworks (e.g., NestJS) and the integration of RESTful APIs, as well as familiarity with relational and non-relational databases (e.g., Postgre SQL)Strong advocate for AI and experienced with coding tools (e.g., Claude Code, Codex)Excellent analytical and troubleshooting abilities with a passion for clean, maintainable code, as well as experience in agile development methodologiesStrong interpersonal skills with a proven track record of cross-functional collaboration and glue workHighly motivated and proactive, eager to take ownership of the full domain and follow through in a fast-paced, aspiring startup environmentFluency in EnglishBenefitsAttractive comp + ESOP: Competitive salary plus meaningful equityTrue 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 - we're a tight-knit, ambitious team with a builder mindsetModern stack, flexible setup: on-site in Munich, 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!#J-18808-Ljbffr