Roosevelt Sebial

Senior Software Engineer with 15+ years of hands-on experience designing, developing, and maintaining enterprise applications using C#, ASP.NET Core, .NET Framework, Entity Framework, SQL databases, and Microsoft Azure. Specialized in backend API development, enterprise system integrations, production troubleshooting, and end-to-end software delivery across service management, inventory, job management, HR technology, healthcare, and retail. Experienced in integrating ERP and accounting platforms, including Odoo, Xero, and QuickBooks, to streamline business operations and data synchronization.

Independently architected and developed a complete Point-of-Sale (POS) system, successfully securing BIR accreditation through technical implementation, regulatory compliance, and system demonstration.

Senior Backend Developer - TOA Global Manila Inc.

(2023-05)

• Design, develop, and maintain enterprise backend solutions for international clients, supporting service management, inventory, job management, and auditing, with seamless ERP and accounting integrations across Odoo, Xero, and QuickBooks to streamline business operations and data synchronization.

Principal Software Engineer (Project-Based) - Deltek Systems Philippines

(2022-02 - 2023-03)

• Debugged and resolved issues in Deltek Vantagepoint; supported enterprise application reliability and QuickBooks integration through Workato automation.

Senior Software Developer / .NET Core Backend Engineer - Lemontech IT Solutions

(2019-09 - 2022-04)

• Developed .NET Core backend components for offshore CRM systems, worked with Azure databases/resources, and led developers while remaining hands-on; coordinated releases and onboarding.

Senior Software Developer - DSLC Data Support

(2016-02 - 2019-07)

• Developed and maintained a US healthcare client’s web-based EMR system for Hospice Systems using C#, ASP.NET, jQuery, and SQL Server; resolved defects and supported releases with Octopus Deploy.

Lead Software Developer / Software Architect / Supervisor - Amesco Drug Corporation

(2012-04 - 2016-02)

• Independently architected and built a complete POS system covering sales transactions, receipts, reporting, and business operations.
• Secured BIR accreditation for Amesco as a POS software provider by implementing standards, preparing documentation, and personally demonstrating the system to evaluators.
• Built multi-branch sales, inventory, and reporting solutions with bulk-data processing; owned design through deployment.

Core Software Developer - JARB Business Solutions

(2011-06 - 2012-04)

• Built accounting and business management software for cooperatives and NGOs; performed systems analysis, database design, and infrastructure planning.

Full-stack .NET Software Engineer (Independent Contractor) - Crimcheck Inc.

(2019 - 2025)

Intermittent, task based

Part-Time IT Instructor

Database management, systems analysis, programming, and IT ethics.

Freelance Web Developer

Client website and application maintenance.

BS - Information Technology - Mindanao State University (2007 - 2011)

Master in Information Technology, graduate coursework - Information Technology - University of Southeastern Philippines (2016 - 2016)