Nikolay S.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.

Looking for an Experienced Java Developer who can also provide full-stack and architectural leadership? With 12+ years of experience as a CTO and software engineer, I specialize in designing scalable solutions and leading teams that transform business needs into high-performing software. From backend systems to enterprise platforms, I combine deep Java expertise with cutting-edge technologies and strategy. Key facts about my experience - 12+ years in software engineering and technology leadership - 4 years average project duration - Strong background in Java development, requirements analysis, and solution design - Delivered complex enterprise systems for global clients - Domain knowledge spanning Hospitality, Retail, Fintech, Health, Real Estate, and more Core Technologies - Languages: Java, C/C++, Python - Frontend: React.js, Vue.js, TypeScript - Data: SQL-based (PostgreSQL, MySQL), no-SQL (MongoDB, Hazelcast), messaging (Kafka, RabbitMQ) - Architecture & Strategy: Solution Architecture, Technical Vision, Proof of Concept, SDK & Framework design, DDD, event-driven architecture, micro-services - Cloud & Infrastructure: AWS, Azure, CI/CD (Jenkins, GitHub Actions), IaC(Ansible, Terraform), Docker/Kubernetes, containerized and scalable deployments If you’re looking for someone who can combine Java expertise, technical depth, and strategic leadership to turn ambitious ideas into reliable software solutions, I’ll help bring your vision to life. Explore my portfolio of recent projects completed together with my teammates at MobiDev, a software development and AI consulting company serving clients across North America and Europe.