Muhammad Adnan

Web App Consultant (Senior Java Engineer)

Systems Limited • Vollzeit

May 2024 - Present • 2 yrs 5 mos

As a Senior Java Engineer, I worked on the AtClose enterprise platform and led the transition from a JSF monolithic architecture to microservices. Key achievements: • Designed microservices boundaries, data ownership, and API contracts • Developed and integrated RESTful microservices • Improved feature turnaround time by approximately 35% • Reduced key page load times by approximately 40% • Refactored legacy Java modules and improved maintainability • Used AI-assisted development tools including GitHub Copilot and Claude to accelerate development and legacy code refactoring • Improved code quality through SonarQube standards • Collaborated with product managers, designers, and engineering teams • Led code reviews and knowledge-sharing sessions

Senior Software Engineer (Java) Team Lead

Crewlogix Technologies • Vollzeit

Nov 2023 - Jun 2024 • 7 mos

• Architected database schema and microservices design for an enterprise organization and asset-management platform • Led a team of 5 developers, managing client meetings, requirements, sprint planning, and delivery • Built event-driven services using Spring Boot, Spring Data JPA, Kafka, and MySQL • Designed OAuth2 authentication and authorization with role-aware and location-based permissions • Containerized services using Docker • Automated deployments using Jenkins CI/CD pipelines

Senior Software Engineer (Java)

Soliton Technologies • Vollzeit

Feb 2020 - Oct 2023 • 3 yrs 8 mos

• Designed and maintained enterprise-grade healthcare applications (web + desktop) using Java 8, Spring Boot, and Electron.js, serving clinical users in production for 3+ years. • Integrated multiple EHR/EMR systems via HL7 FHIR APIs, building FHIR resource transformers for bidirectional data mapping — enabling secure, standards-compliant health-data exchange across vendors. • Led end-to-end third-party healthcare integrations, managing vendor sandbox environments through development, validation, and production go-live. • Implemented Single Sign-On (SSO) with SAML 2.0, delivering seamless authenticated access across integrated healthcare platforms. • Contributed to migrating legacy monoliths to microservices with Kafka-based asynchronous messaging, improving scalability and deployment flexibility. • Developed Electron.js/Node.js desktop utilities that automated data synchronization, eliminating manual double-entry between clinical applications. • Raised code quality and security compliance by resolving SonarQube vulnerabilities and hotspots; wrote comprehensive JUnit/Mockito unit and integration test suites. • Collaborated with business analysts, QA, and third-party vendors to deliver secure, compliant healthcare software.