Sultan Sultan

• Led design & development of scalable backend services using C# and ASP.NET Core.
• Integrated third-party APIs and maintained secure, high-performance data pipelines.
• Collaborated in agile sprints to enhance system architecture.
• Troubleshot complex production issues and resolved them efficiently.
• Enhanced code quality through automated tests, code reviews, and CI practices.
• Monitored database performance to keep workflows running smoothly.
• Troubleshot and resolved performance issues for databases and software.

• Designed and developed enterprise-level apps using C# and ASP.NET Core.
• Mentored junior developers, reviewed code, and enforced coding best practices.
• Built and maintained RESTful APIs for third-party integrations.
• Collaborated with cross-functional teams to ensure scalable solutions.
• Refactored legacy code to improve performance and reliability.

Company Overview: Fintech – Digital Wallet Services

• Engineered and maintained backend applications using C#, ASP.NET, and .NET Core, focusing on secure and high-performance financial services.
• Designed, implemented, and debugged both RESTful and SOAP-based services to power the ZainCash mobile app, ensuring seamless user experiences.
• Upgraded and refactored core middleware components to meet evolving regulatory and compliance requirements, including KYC/AML processes.
• Applied best practices in API versioning, error handling, and data validation to maintain system integrity across integrations.
• Tuned backend performance through profiling, caching strategies, and asynchronous programming, ensuring stability in a high-availability environment.
• Actively participated in incident resolution, performance tuning, and service deployment across staging and production environments.

Company Overview: Fintech – Digital Wallet Services

• Built C# (.NET Core)-based backend systems for mobile payment platforms.
• Implemented REST & SOAP APIs for core payment systems and partner integrations.
• Upgraded middleware for regulatory compliance and transactional integrity.
• Built dynamic reporting modules using Builder pattern to support various financial dashboards.
• Ensured data integrity across reconciliation and settlement processes.

• Developed moderately complex web apps using C# and ASP.NET.
• Conducted user need analysis and translated findings into tech requirements.
• Worked closely with clients throughout the development process to gather feedback, ensuring that final products met their expectations.
• Participated in design and planning exercises for future software rollouts.

• Developed web-based monitoring tools using C# and ASP.NET to support the operations team in tracking and managing real-time payment flows.
• Integrated payment gateways and service channels with SADAD KSA via BizTalk Server, enabling automated transaction processing for major clients including Saudi Electricity Co. and Zain KSA.
• Ensured end-to-end transaction visibility, built alerting mechanisms, and resolved payment issues to maintain SLAs and operational continuity.
• Participated in system design and troubleshooting sessions to ensure high availability and fault tolerance in payment-related workflows.
• Collaborated closely with business analysts and QA teams to validate payment rules and handle exceptions gracefully.

• Learned the end-to-end flow of payment systems, including transaction lifecycle, status codes, and integration basics.
• Developed small-scale web applications using C# and ASP.NET, laying the foundation for enterprise development.
• Gained practical experience in frontend development using HTML, CSS, JavaScript, and jQuery for form handling and UI enhancements.
• Worked with JSON and XML for data exchange, including serialization and deserialization using .NET libraries.
• Built a strong foundation in backend development concepts such as request handling, model binding, and server-side validation within the .NET ecosystem.
• Assisted in debugging, deployment, and basic database integration tasks using SQL Server.