Senior Backend Engineer (.NET) (f/m/d)

Join Apaleo and Shape the Future of Hospitality Tech!Apaleo is the world’s most open, API-first property management platform powering the next generation of hospitality operations. Its modular, AI-powered infrastructure enables hoteliers to customise their tech stack, automate routine work, and deliver seamless, personalised guest experiences, powered by best-in-class apps and autonomous AI agents that adapt to every stay.We are looking for a Senior Backend Engineer (f/m/d) to build the foundation of Apaleo’s market-facing API layer, bringing agentic booking into hospitality and enabling the next generation of guest-facing AI experiences.This is a highly autonomous role where you will design and ship the Storefront API, a production-grade, scalable interface that allows external systems (like ChatGPT and booking platforms) to interact directly with Apaleo.You’ll operate at the intersection of backend engineering and AI, starting with clean API architecture and evolving into systems that power intelligent, agent-driven interactions.What You’ll Be Up ToBuild the Storefront API from ScratchDesign and implement a production-grade, multi-tenant API / MCPEnable seamless integration with external platforms and AI agentsEnsure scalability, reliability, and high performance from day oneOwn the Full API LifecycleDefine API schemas and contracts (OpenAPI)Implement versioning strategies and backward compatibilityDesign authentication, authorization, and security patternsBuild rate limiting and usage controlsEnsure strong documentation and developer experienceSet up monitoring and observabilityWork Across Distributed SystemsIntegrate with existing .NET microservicesConnect to event-driven systems (Kafka or similar)Navigate and improve a complex distributed architectureOperate in the CloudDeploy and manage services in AWSWork with Docker and containerized environmentsContribute to infrastructure as code practicesCollaborate on AI-Driven Use CasesPartner with AI engineers to enable agent-based workflowsBuild APIs that integrate with LLM-powered systemsHelp evolve the platform toward AI-native product capabilitiesShape Engineering StandardsDefine best practices for:API designSystem architectureCode quality and maintainabilityContribute to how the ecosystem team scales and operatesWhat You’ll Bring to the TeamCore RequirementsProven experience building and operating production-grade APIs at scaleStrong expertise in REST API design and architectureSolid experience with C# / .NET8+Hands-on experience with AWS, Docker, and infrastructure as codeStrong understanding of microservices and distributed systemsAbility to work independently and make architectural decisionsInterest in AI systems and integrationsMindset & TraitsSelf-starter — you take ownership and drive work without waiting for directionComfortable with ambiguity — you can build in evolving, low-structure environmentsPragmatic decision-maker — you balance speed with long-term scalabilityBuilder mindset — you enjoy creating systems from scratchCurious about AI — you’re motivated by where backend systems meet intelligent agentsNice to HaveExperience with:Event-driven systems (Kafka or similar)Multi-tenant SaaS architecturesDeveloper-facing or public APIsExposure to:LLM integrations or agent-based systemsPythonAny major frontend frameworkBackground in hospitality tech (not required)Why This Role MattersThis role is about more than building APIs, it’s about defining how external systems interact with Apaleo in an AI-first world.You’ll:Lay the foundation for market-facing, AI-integrated productsEnable guest-facing experiences powered by intelligent agentsHelp transform Apaleo into a platform ready for autonomous systemsWhat We OfferCulture & GrowthA Diverse & International Team: Work alongside passionate professionals from over 20 nationalities, bringing unique cultural perspectives, backgrounds, and experiences to shape the future of hospitality tech.Growth & Development: As we scale, so do your opportunities. You’ll benefit from 360 feedback reviews, a dedicated learning budget, and plenty of chances to take on more responsibility. Our evolving career framework ensures you have increasing opportunities to learn new skills, advance your career, and make an impact.Autonomy & Ownership: Great ideas can come from anywhere. We empower you to take responsibility, make decisions, and contribute directly in an environment built on trust, transparency, and collaboration.Shape the Future of Hospitality Tech: Be part of a fast-growing scale-up transforming the hospitality industry. From day one, your work drives real impact and you’ll have the freedom to bring your ideas to life.Competitive & Fair Compensation: We believe great work deserves great pay. Our salaries are competitive and guided by benchmarking data to ensure fairness across all roles and teams. We make sure to recognize and reward performance and contribution.Perks & LifestyleFlexible & Remote Work Options: We focus on results, not clocking hours. You can work from home, the office or in a hybrid setup, with flexibility to adapt your schedule as long as it makes sense for your role, your team and our business.Free Public Transport: Travel across Germany with ease using our fully covered Deutschland Ticket.Team Connection: Strong connections fuel collaboration. We celebrate and connect through regular team dinners, company meetups, Oktoberfest celebrations, Christmas parties, and other offsite events.Paid Time Off: Enjoy 30 days of vacation to fully disconnect, recharge, and return inspired.Health & Wellbeing: Prioritize your health with access to hundreds of gyms, fitness studios, and wellness options through our EGYM Wellpass membership.