Janario Oliveira
Tech Lead & Staff Software Engineer at Raisin GmbH
Berlin Metropolitan Area Germany
Summary
👤
Senior🎓
Top SchoolJanario Oliveira is a Tech Lead and Staff Software Engineer with 13 years of experience building and operating cloud-native platforms, specializing in Kubernetes on AWS and infrastructure-as-code with Terraform. He has led CI/CD and platform initiatives that accelerated delivery and improved reliability across product teams, and played a hands-on role in migrating a banking platform to EKS while diagnosing performance regressions. A pragmatic polyglot (Java, Python, Go) with deep backend and DevOps expertise, he has contributed to prominent open-source projects like Hibernate and Garden—improving ORM internals and Helm/Kubernetes integrations. Janario combines systems-level troubleshooting with long-term tech-debt management and capacity planning, enabling scalable, secure production environments. Based in Berlin, he pairs SRE-style discipline with developer experience improvements, often surfacing optimizations that reduce costs and increase throughput.
13 years of coding experience
8 years of employment as a software developer
Bachelor's degree, Computer Science, Bachelor's degree, Computer Science at Centro Universitário Sant'Anna
English, Portuguese
Stackoverflow
41reputation
17kreached
3answers
0questions
Github Skills (38)
kubernetes10
object-mapping10
validations10
testing10
java-persistence-api10
http10
validation10
java10
plugin10
javas10
http-client10
junit10
hibernate10
persistent10
orm10
Programming languages (11)
Github contributions (5)
jenkinsci/http-request-plugin
Nov 2012 - Sep 2020
This plugin does a request to an url with some parameters.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:21 releases, 1 review, 194 commits in 7 years 11 months
Contributions summary:Janario primarily focused on enhancing the functionality of the HTTP request plugin. They implemented changes to encoding and character set handling, ensuring proper data transmission. Further contributions included the introduction of an HTTP client library, facilitating more robust HTTP requests. Finally, the user integrated authentication mechanisms, incorporating support for basic, digest, and form-based authentication methods, which significantly improved the plugin's versatility.
jenkinsparametersjenkins-pluginjenkins-api-pluginplugin
hibernate/hibernate-orm
Feb 2013 - Mar 2016
Hibernate's core Object/Relational Mapping functionality
Role in this project:Back-end Developer
Back-end DeveloperContributions:22 commits, 17 PRs, 10 comments in 3 years 1 month
Contributions summary:Janario contributed significantly to the Hibernate ORM project, focusing on enhancing its core object-relational mapping functionality. They implemented native queries for data manipulation (insert, delete, update) and addressed issues related to custom EnumTypes within map relationships. Furthermore, the user modified the metamodel generator and collection cache invalidation, indicating a deep understanding of the framework's internal workings and caching mechanisms. Their commits demonstrate expertise in addressing various aspects of Hibernate's functionality, including query execution, data mapping, and caching behavior.
gradlejava8enversjdbcorm
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