Vlad Mihalcea
Chief Technology Officer at vladmihalcea.com
Cluj-Napoca, Romania
Summary
🤩
Rockstar🎓
Top SchoolVlad Mihalcea is a Java Champion and CTO with 12 years of formal experience and over two decades of hands-on software work, specializing in high-performance Java persistence and database-driven systems. He founded Hypersistence to deliver training, consulting, and the Hypersistence Optimizer tool that automates detection of mapping, configuration, and data-access bottlenecks before production. A prolific technical writer and conference speaker, he has published 500+ articles and authored the book and course High-Performance Java Persistence, translating deep Hibernate and JPA expertise into practical guidance. Vlad is a top contributor to Hibernate and the maintainer of notable OSS like FlexyPool, where he implemented connection pool resilience strategies, and he has driven major docs and example migrations for the flagship hibernate-orm project. Based in Cluj-Napoca, Romania, he combines pragmatic engineering, developer advocacy, and tooling to help teams ship faster and run reliably at scale.
12 years of coding experience
14 years of employment as a software developer
Master of Science, Multimedia Techonologies, Master of Science, Multimedia Techonologies at Electronics and Telecommunications Faculty, Technical University of Cluj-Napoca, Cluj-Napoca
Romanian, English
Stackoverflow
147,963reputation
45.6mreached
1,631answers
28questions
debugging
top-5%
dictionary
top-5%
pagination
top-1%
maven
top-5%
merge
top-1%
concurrency
top-1%
Github Skills (93)
jakartaee10
transaction10
postgresql10
database-connection10
spring-data10
proxy10
javas10
pagination10
concurrency10
locking10
validation10
sql10
hibernate-mapping10
jpa10
h210
Programming languages (8)
Github contributions (5)
vladmihalcea/flexy-pool
Feb 2014 - Aug 2021
FlexyPool adds metrics and failover strategies to a given Connection Pool, allowing it to resize on demand.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:334 commits, 17 PRs, 227 pushes in 7 years 7 months
Contributions summary:Vlad implemented core backend features for the FlexyPool library, focusing on the addition of new connection acquiring strategies. They added features such as a Flexy data source, a retry strategy, and a pool size increment strategy based on timeout events. The changes involve new Java classes and modifications to existing classes within the core library, demonstrating a focus on expanding the functionality and robustness of the connection pool management. These contributions aim to enhance the library's ability to handle connection acquisition and handle potential connection pool exhaustion scenarios.
connection-poolfailoverflexy-pooljavahistogram
hibernate/hibernate-orm
Jan 2016 - May 2021
Idiomatic persistence for Java and relational databases
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 714 commits, 875 PRs in 5 years 5 months
Contributions summary:Vlad's contributions primarily focused on migrating documentation from Docbook to Asciidoctor and updating the examples, indicating a significant involvement in maintaining and enhancing the project's documentation. Additionally, the user refactored the code and added some examples from existing test cases to the documentation. Furthermore, the user appears to be familiar with the project’s structure.
javarelational-databaseshibernateormjpa
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