Khaldoun El Danaf
Senior Software Engineer (Sdeiii) @SIXT
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WORK HISTORY
Senior Software Engineer (Sdeiii) @SIXT
Pullach im Isartal, DE
Lead engineer on connected vehicle integrations (100k+ fleet) and a global location management platform branches worldwide), designing and delivering distributed backend systems that power Sixt’s mobility operations. Progressed from SDEII to in recognition of deep domain expertise and ownership of high-impact initiatives.(,+) • Integrated OEMs (BMW, Toyota, Stellantis, Teltonika, Sharebox) → expanded connected fleet by 90%, reducing rental errors and customer complaints by 80%. • Built geofencing & turnaround service → decreased idle fleet time, boosted utilization and revenue. • Developed fraud-prevention tracking → prevented thefts, saving millions annually. • Designed vendor proxy → throttled event spikes, reduced incidents by 90%.() • Building a centralized system for branches, replacing Salesforce as the single source of truth. • Designed parameter inheritance logic & concurrency-safe approval workflows for multi-level branch hierarchies. • Reduced manual errors and licensing costs while streamlining global configuration. & • Partnered with Staff Engineers on architecture and ADRs, shaping long-term technical direction. • Facilitated sprint planning, quarterly roadmaps, and cross-team requirement discussions. • Provided mentorship and contributed to hiring through technical interviews: Java 24, Spring Boot, Kafka, PostgreSQL, Redis, DynamoDB, gRPC, AWS (RDS, MSK, IoT, Kinesis, SNS, S3), Kubernetes, Docker, Terraform, Grafana, Prometheus, Instana, CI/CD (Jenkins, Git, Nexus), JUnit, React, Redux, TypeScript.
EDUCATION
Lebanese University
Bachelor's degree, Computer Science
ABOUT KHALDOUN EL DANAF
I’m a building scalable, distributed systems and cloud-native platforms. Currently at, I lead critical initiatives in connected car systems (100k+ vehicles integrated across multiple OEMs) and enterprise platform engineering (global location management system for branches).At Sixt, I’ve: • Scaled connected fleet coverage by 90% through integrations with OEMs like BMW, Toyota, and Stellantis. • Built fraud-prevention and geofencing systems that saved millions of euros in operational and vehicle losses. • Designed and deployed a centralized global locations platform, replacing Salesforce and reducing costs while improving consistency. • Acted as informal team lead, mentoring peers, guiding system design, and interviewing engineers: distributed systems, cloud-native development (Java, Spring Boot, AWS, Kafka, Kubernetes), system design, and technical leadership. I balance clean design principles (SOLID, OOP, design patterns) with pragmatic solutions that scale: solving large-scale technical challenges, collaborating across teams, and mentoring engineers. I’m currently sharpening my system design and distributed systems expertise as I grow toward a / role.I’m also deeply interested in, following the evolution of large-scale models and distributed AI platforms — and eager to explore how they intersect with enterprise and mobility solutions.I hold permanent residency in Germany and am authorized to work without sponsorship.
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