Senior Full-Stack Engineer (Python & .NET) (f/m/d)

Apaleo

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 TO BUILD THE STOREFRONT API FROM SCRATCH * Design and implement a production-grade, multi-tenant API / MCP * Enable seamless integration with external platforms and AI agents * Ensure scalability, reliability, and high performance from day one OWN THE FULL API LIFECYCLE * Define API schemas and contracts (OpenAPI) * Implement versioning strategies and backward compatibility * Design authentication, authorization, and security patterns * Build rate limiting and usage controls * Ensure strong documentation and developer experience * Set up monitoring and observability WORK ACROSS DISTRIBUTED SYSTEMS * Integrate with existing .NET microservices * Connect to event-driven systems (Kafka or similar) * Navigate and improve a complex distributed architecture OPERATE IN THE CLOUD * Deploy and manage services in AWS * Work with Docker and containerized environments * Contribute to infrastructure as code practices COLLABORATE ON AI-DRIVEN USE CASES * Partner with AI engineers to enable agent-based workflows * Build APIs that integrate with LLM-powered systems * Help evolve the platform toward AI-native product capabilities SHAPE ENGINEERING STANDARDS * Define best practices for: * API design * System architecture * Code quality and maintainability * Contribute to how the ecosystem team scales and operates WHAT YOU’LL BRING TO THE TEAM CORE REQUIREMENTS * Proven experience building and operating production-grade APIs at scale * Strong expertise in REST API design and architecture * Solid experience with C# / .NET 8+ * Hands-on experience with AWS, Docker, and infrastructure as code * Strong understanding of microservices and distributed systems * Ability to work independently and make architectural decisions * Interest in AI systems and integrations MINDSET & TRAITS * Self-starter — you take ownership and drive work without waiting for direction * Comfortable with ambiguity — you can build in evolving, low-structure environments * Pragmatic decision-maker — you balance speed with long-term scalability * Builder mindset — you enjoy creating systems from scratch * Curious about AI — you’re motivated by where backend systems meet intelligent agents NICE TO HAVE * Experience with: * Event-driven systems (Kafka or similar) * Multi-tenant SaaS architectures * Developer-facing or public APIs * Exposure to: * LLM integrations or agent-based systems * Python * Any major frontend framework * Background in hospitality tech (not required) WHY THIS ROLE MATTERS This 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 products * Enable guest-facing experiences powered by intelligent agents * Help transform Apaleo into a platform ready for autonomous systems WHAT WE OFFER CULTURE & GROWTH * A 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 & LIFESTYLE * Flexible & 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.

Apaleo

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. If you’re driven by the idea of making hospitality smarter, more human, and powered by cutting-edge technology, we’d love to hear from you. What You’ll Be Up To: * Implementing Core services for the platform in .NET 10 that runs in Docker containers; * Developing features from DB to the APIs; * Ensuring the platform remains scalable and the codebase remains maintainable; * Proactively monitoring the services in production and spotting potential issues; * Care about the quality of produced code by covering it with unit and e2e tests; * You will be a part of an exciting, open, and agile team, where your voice matters and has a company-wide impact. What You’ll Bring to the Team: * You have a degree in Computer Science or a related technical field, or equivalent practical experience; * You bring at least 5 years of experience working in software engineering with relevant programming experience; * Proficient in .NET backend development, including technologies such as Kafka (or equivalents), AWS, Docker, ECS/Kubernetes, and PostgreSQL. * Experience using AI-assisted coding tools (e.g., GitHub Copilot, Cursor AI, Claude Code) to accelerate development, troubleshoot code, and generate documentation; * A growth mindset toward continuously exploring new AI technologies that can positively impact our engineering culture and delivery pipeline. * Nice to have: Experience applying Kafka for real-time processing, leveraging AWS/Docker for DevOps workflows, or performing PostgreSQL optimizations. * You know how to break down large epics into smaller issues; * You worked with the concepts of IaaS/ PaaS/ SaaS; * You worked extensively with microservices-based architecture and used asynchronous message-based communication; * You communicate fluently in English; German and any other languages are always welcomed; WHAT WE OFFER CULTURE & GROWTH * A 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 & LIFESTYLE * Flexible & 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. How you make an impact joining Apaleo: Joining Apaleo means more than just taking on a role, it’s about driving real change in the hospitality industry. Your contributions will directly shape our innovative platform, influence company-wide decisions, and help redefine the future of hospitality tech. At Apaleo, your voice matters, your ideas are valued, and your impact is tangible. Be part of a team where your work fuels progress, collaboration sparks innovation, and growth is a shared journey. We are proud to be an Equal Opportunity and Affirmative Action Employer, committed to fostering a diverse, inclusive, and welcoming workplace. We encourage applications from individuals of all backgrounds, regardless of race, color, religion, gender identity or expression, sex, national origin, age, marital status, disability, or any other characteristic protected by applicable law. Your personal data will be handled with the utmost care and in compliance with GDPR and relevant data protection regulations. We celebrate differences and believe that diversity enriches our team and drives innovation.

Awin

Purpose of the Position We are hiring a Software Engineer for the AI Solutions team to design, build and operate the backend systems, APIs and cloud-native services that power Awinʼs next-generation AI-native products. You will deliver production-grade features used by advertisers, publishers and partner managers to improve discovery, automation and decision-making through conversational experiences and intelligent workflows. This role combines strong backend engineering with practical exposure to AI-enabled application development. You will focus on building reliable, secure and maintainable systems that integrate LLMs and AI workflows into production, while collaborating closely with Senior AI Engineers, Data Engineers, Senior Software Engineers and Product Managers. The Team You will be joining the AI Solutions team in our Growth Domain. This team is responsible for building AI-native products and capabilities across the organisation. Our work is highly visible and every feature you ship can have a direct impact on how our customers operate and grow affiliate programs. The team works across conversational AI, intelligent automation, AI-assisted discovery etc., We partner closely with Product Managers, UX, Data Engineering and platform teams to move ideas from experimentation into reliable production systems. Our engineering culture is built on pragmatic problem solving, strong ownership, fast iteration and building production-ready systems with a strong operational mindset. We care deeply about reliability, observability, maintainability and delivering measurable customer value. Weʼre cloud-first on AWS, working primarily with a Python-based backend stack alongside modern AI tooling and infrastructure. The team practices Scrum and youʼll have the opportunity to contribute ideas, improve engineering practices and work closely with experienced engineers across AI, backend and platform domains. Along with access to learning platforms, hackathons and cross-team initiatives, you will have opportunities to grow your expertise in backend engineering, cloud-native systems and modern AI-enabled product development. What Youʼll Do * Design, build and operate scalable backend services and APIs for AI-enabled applications and workflows. * Collaborate with Senior AI Engineers and Data Engineers to integrate AI capabilities and LLMbased workflows into production systems. * Develop cloud-native services using Python and frameworks such as FastAPI on AWS with ECS, Lambda, RDS, S3 and ElastiCache/Redis. * Support AI orchestration and intelligent agent workflows, including inference pipelines, tool integrations and scalable AI workflow patterns. * Build and maintain CI/CD pipelines, automated testing and release processes.  * Improve observability and operational excellence through logging, monitoring, distributed tracing, alerting and production troubleshooting. * Participate in system design discussions, code reviews and architecture reviews. * Optimise backend services for performance, scalability, resilience and cost-efficiency.  * Work closely with Product Managers and cross-functional teams to translate user problems and business requirements into technical solutions. * Contribute to engineering culture through collaboration, ownership, knowledge sharing and continuous improvement. What Youʼll Bring * 3+ years of professional experience building backend systems and APIs in production environments. * Strong Python development skills and experience with frameworks such as FastAPI, Flask or similar. * Solid backend engineering fundamentals including API design, distributed systems, concurrency, caching and performance optimisation. * Experience working with AWS services such as ECS, Lambda, RDS, S3 and ElastiCache/Redis. * Infrastructure as Code experience using Terraform or Terragrunt. * Experience with PostgreSQL, Redis, Docker and CI/CD tooling such as GitHub Actions. * Working knowledge of Java and/or TypeScript with the ability to understand, contribute to or integrate with services and applications built using those technologies. * Understanding of observability, monitoring and operational best practices for production systems. * Ability to debug and troubleshoot issues across APIs, infrastructure and application services. * Strong collaboration and communication skills within agile product teams. * Interest in AI-enabled applications and willingness to work across backend, infrastructure and AI integration layers. Nice to Have * Implement and maintain Infrastructure as Code using Terraform and Terragrunt. * Exposure to AI/LLM application development or orchestration frameworks such as LangChain or LangGraph.  * Experience working with Angular for frontend integrations or internal tooling. * Familiarity with LangSmith or similar tracing and observability platforms. * Exposure to conversational AI systems, agent-based workflows or retrieval-augmented generation (RAG) concepts. Our Offer * Flexi-Week and Work-Life Balance: We prioritise your mental health and wellbeing, offering you a flexible four-day Flexi-Week at full pay and with no reduction to your annual holiday allowance. We also offer a variety of different paid special leaves. * Remote Working Allowance: You will receive a monthly allowance to cover part of your running costs. In addition, we will support you in setting up your remote workspace appropriately. * Flexi-Office: We offer an international culture and flexibility through our Flexi-Office and hybrid/remote work possibilities to work across Awin regions * Meal Vouchers: You will be supported with a certain net sum to spend it on a variety of lunches. * Health & Wellbeing: The insurance covers several types of health, vision and / or dental treatments for you and for up to one additional family member. * Remote Working Furniture Package: After 3 months of employment, you will be eligible for a furniture package, which should enable you to set up a proper workplace at your remote working location * Appreciation: Thank and reward colleagues by sending them a voucher through our peer-to-peer program. Established in 2000, Awin is proud of our dynamic, social and inclusive culture. Like all businesses, we’ve had to adapt and nurture our culture in a virtual environment. Our virtual ‘Life @ Awin’ hub brings our colleagues from across the globe together for various social activities. Diversity & Inclusion are paramount to us, and we proudly pursue and hire diverse team members. We champion uniqueness and authenticity; this is who we are at our core. Our network of affiliate partnerships are diverse and transparent, as are the employees powering our vision to build the world’s leading open partner ecosystem. We welcome all backgrounds, identities, and experiences. If you need support at any point in the application or interview process, please let us know. Awin is part of the Axel Springer group. Learn more at axelspringer.com/en/, and explore the Axel Springer Essentials here: axelspringer.com/en/inside/the-essentials-what-we-have-adapted-and-why   Apply now to begin the next stage of your career at a progressive company that supports both your professional and personal development. #LI-RS1