Zejd M.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Senior Full-Stack Engineer with over 10 years of professional experience designing, developing, and deploying scalable enterprise applications. I hold degrees in Computer Science from the University Sarajevo School of Science and Technology (SSST) and the University of Buckingham. Throughout my career, I have delivered robust software solutions across startups, SaaS platforms, enterprise systems, fintech, healthcare, logistics, and legacy modernization projects. My expertise spans the full software development lifecycle, from architecture and backend development to frontend applications, AI integrations, cloud infrastructure, DevOps, and production deployments. ### AI & AI Integrations I have strong hands-on experience integrating modern AI capabilities into web, mobile, and backend applications. I have worked with **OpenAI APIs, OpenAI vector stores, Anthropic Claude, and other AI services**, building production-ready AI features and workflows. I can build **AI assistants, conversational chatbots, context-aware chat systems, RAG solutions, document and knowledge-base assistants, vector search, tool/function calling, AI-powered automation, and intelligent application features**. I also have experience designing the supporting backend architecture, including conversation and message management, document processing, vector-store integration, retrieval pipelines, authentication, usage tracking, and cost monitoring. ### Frontend **Angular & React / Next.js** Extensive experience building modern, responsive, high-performance web applications with clean, scalable architectures and reusable component libraries. ### Backend **Java Spring Boot** My strongest technical expertise. I have architected and developed dozens of enterprise-grade microservices and backend systems using Spring Boot, Spring Security, Spring Data, Spring Cloud, Spring Batch, Spring Integration, Spring Kafka, and Spring MVC. Experienced in distributed systems, REST APIs, event-driven architectures, authentication and authorization, high-performance processing, and enterprise integrations. **Node.js (Express.js & NestJS)** Experience building scalable APIs, real-time services, and backend platforms using asynchronous and event-driven architectures. **Python (Django & FastAPI)** Experience developing secure REST APIs, automation services, integrations, and high-performance backend systems. ### Messaging & Event-Driven Architecture Significant experience with **Apache Kafka and RabbitMQ**, including producers/consumers, event streaming, message routing, dead-letter queues, retries, transactional messaging, scalable processing pipelines, and CloudEvents. ### Databases Extensive experience with **PostgreSQL, MySQL, Oracle, SQL Server, and Supabase**, including schema design, complex SQL optimization, performance tuning, and data consistency. ### DevOps, Cloud & Infrastructure Experienced with **Docker, Kubernetes, Docker Compose, GitHub Actions, GitLab CI/CD, Bamboo, Jenkins, Linux, Nginx**, monitoring, logging, and production deployments. I have worked extensively with microservice architectures, containerized environments, and automated CI/CD pipelines. ### Software Architecture I have designed and implemented **enterprise microservices, REST APIs, event-driven and distributed systems, high-throughput services, SaaS platforms, legacy modernization projects, third-party integrations, and secure authentication/authorization systems**. I follow modern engineering practices including **SOLID, Domain-Driven Design (DDD), Clean Architecture, and TDD where appropriate**. Throughout my career, I have collaborated with cross-functional teams, mentored developers, conducted code reviews, and contributed to technical architecture decisions. If you're looking for a dedicated, proactive, and results-driven Senior Full-Stack Engineer who can contribute across **frontend, backend, AI, cloud infrastructure, DevOps, and system architecture**, feel free to connect with me.