Leon Chen
Allen,TX
Summary
Highly motivated and accomplished software developer with over 20 years of experience in project design and development, specializing in Telecom and Full Stack development. Skilled in analyzing complex systems, researching solutions, and delivering reliable results under pressure. Known for exceptional problem-solving skills and the ability to quickly learn new technologies. Well-versed in helping customers set up and configure networks. Comfortable working with cross-cultural teams, and able to communicate effectively. A dedicated and talented professional with a proven track record of delivering high-quality software solutions.
Overview
27
27
years of professional experience
Work History
Senior Developer
Ymax Communications / MagicJack
01.2009 - 04.2023
- Developed and deployed a robust Spam Call Detection application (Stir/Shaken Verification Server) using NodeJS and MongoDB technologies. The application was successfully implemented on Ymax networks, effectively managing and processing millions of calls on a daily basis.
- Led the development of a REST API application server, specifically designed to provision call features for small business customers. This server was deployed and hosted on the AWS cloud.
- Developed a robust Notification application utilizing JDBC to efficiently process database-triggered events. The application was deployed on the Ymax network, effectively monitoring changes in international call credit balance for customers.
- Implemented new features on both Megaco/H248 and Sigtran/M3UA drivers to control network of Audio Code M8k/M5k VoIP gateways located over 30 sites.
- Implemented new features on both SOAP and Web UI servers to support operation provisioning on Ymax network.
Senior Engineer
Stratus Technologies
08.2006 - 12.2008
- Led deployment of Megaco/H248 driver to control Audio Code M5k/M8k VoIP gateways in Ymax national network.
- Led deployment of Sigtran/M3UA driver for SS7 over IP project for Ymax national network.
- Developed patches to improve network stability, resulting in a significant reduction in complaints from partner carriers such as AT&T and Verizon.
- Department was successfully acquired by Ymax Communications Corporation on January 2009.
Co-Founder/Director of Packet Voice
Emergent Network Solutions
01.2002 - 08.2006
- Designed VoIP software architecture on ENTICE Softswitch/Session Border controller.
- Led development of protocols H323, SIP, Magaco/H248 and Sigtran/M3UA in C++ for VoIP project.
- Supported many VoIP carriers all over world, and traveled to customer site for trial and network startup.
- Resolved successfully inter-working issues with vendors including Cisco, Acme, Avaya, and others.
- Company was successfully acquired by Stratus Technologies on August 2006.
Senior Engineer
Lucent Technologies
11.1999 - 12.2001
- Designed VoIP software architecture on ExchangePlus platform.
- Led development of SIP Proxy/User Agent/Registrar and H323 Gatekeeper/Gateway, which support various audio/video codecs (G711,G729,G7231, H261, H263, H264 etc) and T.38 Fax.
- Conducted first-ever T.38 fax inter-working test in world at customer ITXC site with Cisco VoIP gateway.
- Participated in successful SIP bake-off.
Member of Scientific Staff
Nortel Networks
05.1996 - 10.1999
- Developed three SS7 and ISDN message processing features as team leader.
- Managed and controlled changes from other developers in owned software modules.
- Taught call processing classes for internal training.
Education
Master of Science - Computer Science
University of Texas At Austin
Austin, TX05.1996
Skills
- Programming Languages: Java, JavaScript, C/C, HTML, JSP, JSX
- Technologies: Nodejs, Tomcat, Spring, React, Nextjs, Jenkins, Docker, Swagger, Microservices, Git, AWS, Azure
- Web Services: REST API / JSON, SOAP / XML, J2EE
- Databases: MongoDB, Oracle, PostgreSQL, SQL, JDBC
- VoIP Protocols: SIP, H323, SIGTRAN/M3UA/SS7, MEGACO/H248
- Agile Project Process: Scrum, Sprint Planning, Cross-functional Collaboration
- Software Development Practices: Test-Driven Development (TDD), Interface Design and Implementation
- Performance Optimization: Multithreading, Scalability Optimization
Timeline
Senior Developer
Ymax Communications / MagicJack
01.2009 - 04.2023
Senior Engineer
Stratus Technologies
08.2006 - 12.2008
Co-Founder/Director of Packet Voice
Emergent Network Solutions
01.2002 - 08.2006
Senior Engineer
Lucent Technologies
11.1999 - 12.2001
Member of Scientific Staff
Nortel Networks
05.1996 - 10.1999
Master of Science - Computer Science
University of Texas At Austin
sports
I like watching NFL, NBA and College Football.
Immigration Status:
US Citizen
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