Ivan Nikolic

Senior Backend Engineer at Wazoku

Led architecture and scaling of cloud-native microservices on AWS using Java and Go, supporting 500K+ daily users with sub-200ms latency. Built high-impact backend solutions with robust APIs, observability, and distributed systems design, driving reliability, efficiency, and measurable business growth. Implemented CI/CD pipelines and automated deployments to accelerate release cycles.

Backend Engineer at QuantaX Technology

Migrated monolithic systems to event-driven microservice architecture using Kafka, improving scalability and reducing inter-service latency. Implemented JWT authentication, optimized service communication, and built scalable backend services on AWS with Docker and Kubernetes. Developed CI/CD pipelines (GitHub Actions/Jenkins), reducing deployment time from 24 hours to 45 minutes and enhancing system reliability through observability standards.

Software Engineer at Levi9 Technology Services

Built backend services for financial platforms (loans and mortgages) using Java and Python, supporting high-volume transactions. Integrated third-party APIs, reduced processing errors by 25%, and improved application performance by identifying bottlenecks. Migrated legacy applications to scalable microservices and automated testing/deployment workflows to deliver enterprise-grade applications with cross-functional teams.

Senior Backend Engineer at Wazoku (London, UK)

Architected and scaled cloud-native microservices on AWS using Java and Go, with Docker and Kubernetes, supporting 500K+ daily users and sub-200ms latency. Implemented robust backend design, observability, CI/CD automation, and event-driven architecture to deliver high-impact services.

Lead Backend Engineer at Quantox Technology (Novi Sad, Serbia)

Led backend system design for platforms scaling to 1M+ users, ensuring high availability, fault tolerance, and resilience. Built scalable backend services using Java and Go on AWS, implemented CI/CD, and optimized performance.