Fikri Ahmadi

• Designed and maintained backend services using Java, PHP, Golang for high-traffic payment systems.
• Built scalable RESTful APIs supporting authentication, order processing, and payment transactions.
• Integrated payment gateways including DANA, ShopeePay, GoPay, OVO, QRIS, BCA, DOKU, and Midtrans.
• Implemented caching and queue-based processing using Redis to reduce latency and improve performance.
• Improved system security following OWASP guidelines and encryption best practices.
• Performed debugging, troubleshooting, and root-cause analysis to maintain production stability.

Key Achievements:

• Reduced heavy process response times from 3 seconds to 300 ms using async queue processing.
• Improved PageSpeed performance score from 40% to 80% through backend optimization and data caching.
• Reduced database load significantly with Redis caching and optimized query performance.
• Collaborated with external security consultants to perform comprehensive application security assessments, vulnerability scanning, and penetration testing using industry-standard tools and methodologies (Burp Suite, SQLMap). Reviewed audit findings, prioritized critical risks, and delivered remediation plans covering broken authentication, insecure direct object references, SQL injection vectors, and sensitive data exposure.

• Designed backend systems using Laravel.
• Created APIs, authentication modules, dashboards, and reporting systems.
• Delivered systems for tourism, health institutions, and government environments.