David Heffelfinger
Principal Consultant at Ensode Technology, LLC
Virginia, United States
Summary
👤
Senior🎓
Top SchoolDavid Heffelfinger is a Principal Consultant and Java specialist with over 20 years of experience designing and delivering large-scale enterprise Java and Jakarta EE systems for government and commercial clients. He’s an author of multiple Java EE books, a Java Champion and Apache NetBeans committer who pairs deep API expertise (JSF, EJB, JPA, JMS, CDI, JAX-RS/WS, WebSocket) with practical experience in PrimeFaces-driven UIs and real-time, high-value transaction systems. He’s led greenfield and migration efforts—from monolithic J2EE to cloud-native microservices with Docker, Spring Boot, and OpenShift—while working on mission-critical projects for DHS, DOD, HUD, Fannie Mae and Freddie Mac. A frequent conference speaker and instructor, he translates complex requirements into maintainable architectures and has a track record of performance and scalability improvements in production systems. Based in Virginia, he combines hands-on implementation with mentoring and stakeholder collaboration, and his background includes embedded real-time systems as well as modern cloud deployments.
10 years of coding experience
13 years of employment as a software developer
MS, Software Engineering, MS, Software Engineering at Southern Methodist University
English, Spanish
Github Skills (27)
payara10
microprofile10
java10
tomee9
php9
network-server9
apache8
dm7
glassfish6
jsinterop5
javaee5
reference-implementation4
design-patterns4
fluent-api3
eclipse3
Programming languages (3)
Github contributions (5)
PacktPublishing/Jakarta-EE-Application-Development
Jun 2023 - Feb 2024
, published by Packt
Contributions:2 PRs, 151 pushes, 1 comment in 8 months
dheffelfinger/Java-EE-8-Application-Development-Code-Samples
Jul 2017 - Dec 2018
Contributions:106 commits, 3 PRs, 88 pushes in 1 year 4 months
java-eejavajava-ee-applicationapplication-development
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