Zubair 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.

Fintech Expert | Lead Engineer / Staff Engineer & Cloud Architect (Azure AWS GCP ) 7+ years experience | Spring AI | Full-Time Available (8+ hrs/day) With over 7 years of experience, I specialize in building scalable, high-performance microservices for Fintech and enterprise platforms. My core strength lies in Java (Spring Boot, Spring Cloud), combined with deep expertise in Kubernetes, NGINX gateways, NAT configurations, and secure API design. I've led multiple successful projects, including: KADIPAY (BNPL): Designed a cloud-native microservices architecture with Spring Boot, RabbitMQ, and MySQL. Implemented advanced traffic routing using internal gateways, NAT, and NGINX for seamless scalability and performance. SKILLS & TOOLS: Backend: Java, Spring Boot, Spring Cloud, RabbitMQ, Kafka, Apache Camel Networking: NGINX (API & main gateways), NAT Gateways, VPN, Kubernetes Service Routing, X-Forwarded headers Cloud & DevOps: AWS, GCP, Azure, Docker, Kubernetes, Jenkins, GitLab CI/CD Databases: MySQL, PostgreSQL, Redis, MongoDB Security: OAuth2, JWT, SSL, mTLS Frontend: React, Angular, JavaScript Methodologies: Agile (Scrum/Kanban), TDD, Integration Testing Available full-time and committed to delivering robust, business-aligned solutions. CORE SKILLS: - Java Spring Boot & Spring Cloud: Microservices, API Gateways - Messaging Systems: RabbitMQ, Apache Camel, Kafka - Networking & Infrastructure: NGINX (main + API gateway), NAT Gateways, Kubernetes Networking, X-Forwarded headers, VPN integration, service routing, and traffic control - Security Solutions: OAuth, JWT, SSL for robust authentication and encryption - Cloud Platforms: AWS, GCP, Azure (Serverless, Service Bus, VPC) - OAuth2, JWT, SSL, Mutual TLS - Databases: MySQL, Postgres, Redis, MongoDB - API Design & Development: RESTful APIs, Scalable Application Design - Proficient in SOLID principles, GoF design patterns, Domain-Driven Design (DDD), Clean and Vertical Slice Architectures, Unit of Work, and Repository patterns. - CI/CD & DevOps Automation: Docker, Kubernetes, Jenkins, GitLab CI/CD - Testing: Unit Testing with JUnit, Mockito, TestNG, Integration Testing - Technical Decision Making, Performance Optimization, Cloud Cost Management FRONTEND & MOBILE: - HTML / CSS & JS - React & Angular - Flutter & React Native - Modern JavaScript - Responsive Design 🚀 I’ve solved 150+ algorithmic challenges on LeetCode, continuously sharpening my problem-solving and data structures & algorithms expertise. Additionally: Push Notifications: Experienced in setting up and managing push notifications for mobile and web apps using Firebase Cloud Messaging (FCM), APNs, and Web Push protocols. Email Notifications: Implemented email systems for transactional and marketing emails using SMTP servers, SendGrid, Amazon SES, and JavaMailSender in Spring Boot. Skills: Expertise in integrating and optimizing notification services for scalability and high-volume usage.