Sufyan Ilyas

At Fintechtik, I build and maintain production payment services for the Ghana market, including a redirection-based hosted payment gateway for mobile money and card collections.

I've integrated EPG card payments, MTN Mobile Money, Vodafone Cash, and AirtelTigo flows, covering payloads, redirects, callback signature validation, reconciliation, and retry handling. I also designed Redis-backed payment session handling to prevent failures caused by lost session cookies.

Across biller aggregation, voucher platforms, merchant configuration, and direct debit processing, I build ASP.NET Core and ASP.NET MVC services using Oracle and PostgreSQL. My work includes reusable SDKs, pluggable gateway processors, secure REST APIs, and integrations with services such as Xoxoday, ValueTopup, GCB, AWS S3, and AWS Secrets Manager.

I bring a security-first approach grounded in my Cyber Security degree, applying JWT authentication, AES encryption, rate limiting, validation, and OWASP Top 10 protections. I support production systems with Docker, AWS ECS, Serilog, OpenTelemetry, Prometheus, automated testing, and Agile code review.