Position OverviewWe are looking for a Senior Backend Developer with extensive experience in building scalable microservices architectures. You'll be part of an innovative team developing and operating a global communication platform.ResponsibilitiesAbout the RoleDevelop and maintain backend services in Python with a focus on performance and scalabilityDesign and implement microservices for a high-frequency communication platformWork closely with DevOps and Operations teams to ensure reliable infrastructureHandle complex requirements: emails, SMS, voice calls, video conferencing in a distributed architectureMaintain and evolve Python legacy codeActively shape the technological future by evaluating new tools and integrating AI technologiesYouRequirementsMust-HaveSeveral years of experience as a Backend Developer with PythonStrong expertise in FastAPI and asynchronous programming (async/await)Solid understanding of microservices architecture and REST APIsExperience with at least one of the following databases: MongoDB or MariaDB/MySQLProficiency in Authentication & Authorization (OAuth2, JWT)Docker experience for containerizationVersion control with Git (preferably GitLab)Fluent English for working in international teamsHighly DesirableExperience with Message Brokers (RabbitMQ, Kafka)Knowledge of Caching Systems (Redis)Experience with Kubernetes and container orchestrationFamiliarity with CI/CD pipelines (GitLab CI)Monitoring & Observability tools (Kibana, Sentry, Grafana)WebSocket implementationPydantic for data validationNice-to-HaveExperience with Provider APIs (Twilio, Vonage, Sinch, Infobip)TTS integration (Azure, Acapela)Basic knowledge of Keycloak or other IAM systemsFrontend basics (Preact, React) for better cross-team collaborationExperience with legacy code modernizationInterest in AI/ML technologies and their practical applicationsTech StackCore TechnologiesPython, FastAPI, Pydantic, Async/Await, Microservices, REST APIs, OAuth2, JWT, WebSocketsDatabase & MessagingMongoDB, MariaDB, RabbitMQ, RedisDevOps & ToolingDocker, Kubernetes, Rancher, GitLab CI, Kibana, Sentry, GrafanaThe ProductWe are building a unified communication platformfor customer-facing interactions. The solution integrates multiple communication channels in a highly scalable architecture:EmailSMSVoice CallsConference CallsVideo ConferencingThe platform processes millions of transactions daily and requires the highest standards of reliability and performance.About UsWhat we do:F24 is Europes leading Software-as-a-Service (SaaS) provider for resilience. More than 5,500 customers worldwide rely on F24s digital solutions, which support companies and organisations through all areas of resilience. Solutions cover business messaging and service notification, emergency and mass notification, incident and crisis management, as well as governance, risk and compliance.F24 supports customers in virtually every sector ranging from energy, healthcare, industry, finance, IT, tourism and aviation to a wide variety of public organisations. Many years of international experience have made F24 experts in improving resilience with digital solutions.The company was founded in 2000 in Munich, where F24 AGs head office is still located. Today, F24 supports companies and organisations in more than one hundred countries, via more than 20 locations in Europe and beyond. The F24 AG Board of Directors consists of F24 co-founder Christian Götz and the spokesperson Dr. Jörg Rahmer.Find out more about working at F24 here .Good Reasons To Work At F24Have a tangible impact! Work in an agile environment where you make an important contribution to the success of our customers and the future of our company.Become part of our established company with an inspiring culture, flat hierarchies and our open, honest, innovative and supportive team!Grow with us: We are a company on the road to success, experiencing steady international growth. You have the opportunity to help shape our development. Take advantage of our flexible working model: We rely on a combination of presence in our offices and work from home. This way we strengthen our team spirit and at the same time gives you the opportunity to achieve the best possible balance between private and professional life.