Saif Ur Rehman C.

I work with companies that need strong technical execution in cybersecurity, software engineering, AI and complex product development. My main focus is application security, penetration testing, secure software development and technical security assessments across web applications, APIs, mobile apps, cloud environments and infrastructure. On the security side, my work covers areas such as: • Web and API penetration testing • Mobile application security and Android testing • OWASP ASVS / MASVS based assessments • Authentication, authorization and access control testing • Business logic and API security testing • Vulnerability assessment and manual validation • Burp Suite based application testing • SAST, DAST and software dependency/security reviews • Cloud and infrastructure security • Security remediation guidance and retesting • Secure code review • Reverse engineering and technical investigation I also work closely with a cybersecurity team covering offensive security, GRC and compliance, including professionals with certifications such as OSCP, CISSP, CISM, OSWE, CRTP and CRTO. My background is not limited to security. I have spent years working around software products and engineering teams, which helps a lot when security findings need to be understood and actually fixed rather than simply written into a report. My broader engineering work includes: • Python, Django and backend systems • React / Next.js and modern web applications • AI, machine learning and computer vision • OpenCV, PyTorch, TensorFlow and YOLO • Real-time video and streaming systems • C/C++ and Qt development • Embedded systems and IoT • APIs, databases and cloud integrations • Technical reverse engineering • Complex MVP and product development I have worked with startups, established businesses and technical teams on projects ranging from focused security assessments to full product development. What I care about most is understanding the actual technical problem first. I would rather ask a few useful questions at the beginning than make assumptions and create problems later. If a project involves security, software engineering, AI, computer vision or a difficult technical problem that needs someone who can understand both the engineering and business side, feel free to message me. I am happy to first understand what you are building, where the problem is, and whether I am actually the right fit for it.