William Santiesteban
Software Developer (Full Stack Java, Android & Ios)
Professional profile
Senior Java Engineer with 10+ years of experience in scalable systems , high code quality , CI/CD , DevOps , and security . Expert in stabilizing critical systems and reducing incidents , with a security-oriented mindset
Work experience
Developed and maintained Java (SOAP/REST) services, implemented security-first practices, and ensured compliance with security standards. Focused on backend and security (DevSecOps).
Major achievementLed security hardening of RESTful APIs using Fortify and Nexus, achieving zero code smells and optimal test coverage. Enforced security compliance in production deployments.
Refactored critical modules, improved system stability, and translated client requirements into technical specifications.
Major achievementOrchestrated architectural turnaround of a failing app, reducing support tickets and incidents by 90%. Collaborated with clients to gather requirements.
Maintained and developed iOS applications and frameworks for security-oriented solutions.
Major achievementSupported proprietary frameworks and libraries in Objective-C. Created POCs in Swift and hybrid languages.
Education experience
Sena | Técnico/Tecnólogo
