Stefan Stefanović

Architected AI platform services using FastAPI, delivering scalable APIs for model evaluation, prompt management, and enterprise workflow orchestration. Developed internal applications with React, Next.js, and TypeScript to help engineering teams manage datasets, monitor experiments, and analyze model performance. Designed distributed microservices with Kafka, Celery, and Redis to enable reliable asynchronous execution of evaluation pipelines and operational workflows. Engineered optimized PostgreSQL schemas and ORM queries that improved performance across high-volume analytical and transactional workloads. Built machine learning pipelines using PyTorch and TensorFlow for NLP and computer vision, supporting enterprise AI applications. Implemented retrieval and data-processing services integrating vector search, embedding pipelines, and cloud-native storage to improve AI response quality and operational efficiency. Deployed production workloads on AWS, GCP, Docker, and Kubernetes, impro

Developed scalable commerce applications using Django, Django REST Framework, React, and TypeScript for inventory management, order processing, and customer purchasing workflows. Built secure REST APIs connecting frontend applications with distributed backend services responsible for warehouse operations, logistics, and payment processing. Optimized PostgreSQL databases via schema refinement, indexing strategies, and ORM tuning to improve performance for high-volume transactional workloads. Implemented responsive user interfaces with React, integrating real-time operational data and customer order information through scalable API services. Containerized backend services using Docker and Kubernetes, deploying cloud-native applications across AWS infrastructure with automated CI/CD pipelines. Developed resilient transaction workflows ensuring consistency, fault tolerance, and auditability across payment, fulfillment, and inventory operations. Enhanced application performance by introduci

Developed enterprise SaaS platforms using Django, Flask, React, and JavaScript, delivering secure business applications for fintech, healthcare, and SaaS clients across Europe. Built maintainable REST APIs integrating customer portals, workflow automation systems, and third-party enterprise services. Designed responsive frontend interfaces using React, HTML5, CSS3, and JavaScript to improve user experience across customer-facing business applications. Containerized applications with Docker and supported cloud deployments on AWS, improving development consistency and production reliability. Optimized backend performance through ORM improvements, database tuning, API optimization, and scalable application architecture. Collaborated with Swiss and German engineering teams throughout Agile delivery cycles, translating business requirements into production-ready solutions. Participated in architecture reviews, code reviews, and automated testing initiatives to strengthen software quality an