Prime Source Technologies, LLC (PST) puts Innovative Thinking into IT. PST offers IT program and project management, system and software solutions integration, software development, operations and maintenance support, network engineering and management support, emergency management solution support services, and cloud and mobile solutions to federal, state, and local governments, commercial enterprises, and nonprofit organizations.PST has been actively providing software development, project management, network engineering, system engineering and infrastructure support, and database administration to the U.S. Census Bureau, Department of Commerce Office of Inspector General, District of Columbia Department of Transportation (DDOT), U.S. Department of State and other clients as a prime contractor, and as a subcontractor with the U.S. Department of Homeland Security and the U.S. Department of Defense (Defense Logistics Agency).PST currently has multiple highly complex, multi-year, mission-critical, enterprise-level projects that run across multiple business units. PST uses cutting-edge innovations including Cloud, Virtualization, and Application Development using technologies such as Java, .NET, Oracle ADF, SOA; Relational Database (SQL Server Oracle); Geographic Information System (GIS); iOS and Android mobile application development; and others. PST uses Agile/Scrum methodology, employs CMMI® practices in managing projects, and guarantees delivery on time and within budget.PST is ISO 9001, ISO 20000-1 and ISO 27001 certified and has been appraised at CMMI Level 3. PST has been awarded the GIS Special Achievement award at Esri  users conferences for the Transportation Integrated Enterprise System (TIES) project. PST also received StateScoop award for IT Innovation of the Year for the Transportation Online Permitting System (TOPS) project. PST is also an Oracle Gold Partner and Microsoft Silver Partner.

Management Team

Prime Source Technologies’ management team is highly qualified and result-oriented. We bring unwavering commitment to excellence and innovation to our customers.

  • President: Peng Yap
  • Vice President: Jason Castaneda
  • Vice President: Mostafa Tanim
  • Vice President: Markus Darby
  • Vice President: Tim Abdella
  • Facility Security Officer: Renee Mason
  • Account Payable: Michael Walker
  • Account Receivable: Gregory Phelps

Peng Yap

Since founding the company in 2001, Mr. Yap has guided the overall management and strategic growth of PST. He has 20+ years of experience in software development and executive management. He attended the University of Wisconsin-Stevens Point where he received a Bachelor of Science degree in Mathematics and Computer Information Systems.

Tim Abdella

Mr. Abdella has 20+ years’ experience building and leading software development teams, focused in the geospatial space. As Director of Services and Solutions, Mr.  Abdella balances customer needs across multiple projects and organizations while looking for opportunities to optimize business workflows and grow the organization strategically. Tim has earned Project Management Professional (PMP), Geographic Information Systems Professional (GISP), and Certified Scrum Master (CSM) certifications.

Jason Castaneda

Mr. Castaneda is responsible for financial control, reporting, tax and risk management of PST. He also supports multiple contracts as an Account/Client Manager. Mr. Castaneda has 10+ years of experience in his field and a reputation for strong attention to detail. In his time with Prime Source, he has shown steadfast dedication and contributed greatly to the company. He attended the University of Maryland where he received a bachelor’s degree in both Accounting and Economics. He initially served as a Finance Controller when he first joined PST in 2012.

Markus Darby

Mr. Darby is 20+ years of experience spans business development, program management, IT products / services support and consulting. Federal contract support includes global installation / migration, 24/7/365 service desk management, logistics / inventory, full software / application development lifecycle, modernization, and integration. Markus is an ISO 9001, ISO 20000-1 Lead Auditor and a Holistic Information Security Practitioner who supported over 300 organizations achieve best practice CMMI and ISO based implementation and certification/appraisal projects.

Gregory Phelps

Mr. Phelps joined the Prime Source team as a staff accountant in February 2016.  He has over eight years of experience in finance and government contracting. He has previously worked in multiple roles including accounts receivables, contracts, and payroll processing.  Gregory graduated from the University of Maryland with a bachelor’s degree in economics.

Mostafa Tanim

Mr. Tanim joined the Prime Source team in 2011. He has over 19 years of progressive experience in software development and management. Mr. Tanim successfully led and managed many mission-critical software development projects for federal, state and local government agencies and private organizations. Currently he provides management and technical oversight to multiple projects and provides overall technical direction for the company. Mr. Tanim has earned his master’s degree in Engineering from Texas A&M University. He is a certified Project Management Professional (PMP) and a Certified Scrum Master (CSM).

Renee Mason

Ms. Mason, a Society for Human Resource Management Senior Certified Professional (SHRM-SCP), has over 12 years’ experience in Industrial Security and Human Resources. She joined the Prime Source team in November 2015. Her role involves managing and developing an effective Security Program while managing day-to-day operations. Ms. Mason is very active in the security industry and is currently serving as the Vice Chairperson for the Washington DC chapter of the National Classification Management Society (NCMS).

Michael Walker

 Mr. Walker joined Prime Source to support the financial control and human resources administration of the company. Michael’s responsibilities include processing invoices and managing accounts payable transactions, facilitating recordkeeping on employee benefits elections and administering the company’s 401k program, and processing payroll for full-time and contract employees. Michael received a bachelor’s degree in Economics from Virginia Commonwealth University.


1825 K Street NW, Suite 670,
Washington, DC 20006


Phone: (202) 628-3339
Fax: (888) 648-8648