Nathan Mittlestat
Senior Software Developer at Merative
Rochester, Minnesota, United States
Summary
🤩
Rockstar🎓
Top SchoolNathan Mittlestat is a senior software developer with over 17 years of experience building and hardening enterprise Java application servers, currently advancing cloud-native projects at Merative. He helped transition IBM's WebSphere expertise into the lightweight, high-performance Open Liberty runtime, contributing key security, session caching, and Kerberos fixes that improved robustness in a widely used open-source server. Comfortable across the full lifecycle, he blends hands-on backend engineering with technical leadership, DevOps-driven continuous delivery, and customer-facing troubleshooting of complex production issues. Nathan has repeatedly automated painful manual processes—cutting setup and migration times from weeks to hours—demonstrating a pragmatic focus on reducing operational risk. He pairs deep Java EE/Jakarta knowledge (JDBC, JCA, Bean Validation, JSON-P/B, MicroProfile work) with a knack for turning specification-level requirements into testable, deployable features. Based in Rochester, MN, he brings a steady combination of technical depth and collaborative problem-solving that accelerates large-scale migrations and security improvements.
8 years of coding experience
17 years of employment as a software developer
Bachelor's degree, Computer Science, Bachelor's degree, Computer Science at Michigan Technological University
Stackoverflow
46reputation
2kreached
3answers
0questions
Github Skills (15)
security10
javas10
kerberos10
java10
bean-validation9
osgi8
json8
infinispan7
jakartaee6
cdi6
interceptor6
websphere6
websphere-liberty6
javaee6
testing5
Programming languages (3)
Github contributions (5)
OpenLiberty/open-liberty
Nov 2017 - Nov 2022
Open Liberty is a highly composable, fast to start, dynamic application server runtime environment
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:108 reviews, 236 commits, 172 PRs in 5 years
Contributions summary:Nathan primarily focused on enhancing the security and robustness of the Open Liberty application server. Their work included implementing and reviewing code related to session caching, resolving memory leaks, and updating the Java runtime environment for better security. They also addressed issues related to the Kerberos authentication and Java security configurations within the context of the server.
open-libertyruntimelibertycomposableruntime-environment
nmittles/open-liberty
Oct 2017 - May 2023
Open Liberty is a highly composable, fast to start, dynamic application server runtime environment
Contributions:242 pushes, 91 branches in 5 years 7 months
open-libertyruntimelibertycomposableruntime-environment
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