Jarno Rantala
Lead Developer at OP Financial Group
Porvoo, Finland
Summary
👤
Senior🎓
Top SchoolJarno Rantala is a pragmatic software leader with over 13 years of hands-on experience and 15+ years in the industry, currently serving as Lead Developer at OP Financial Group. He combines deep full-stack engineering roots—evident from long-term contributions to the Vaadin framework—with a track record of building and coaching empowered, self-organising teams across fintech and product companies. Jarno blends technical curiosity (AI, reinforcement learning, data-driven product development) with practical leadership, having led a 40-person R&D organization and steered engineering at BRYTER. He values collaboration and continuous improvement, focusing on motivated teams that ship reliable products regardless of tech stack. Notably, his open-source fixes in Vaadin improved form validation and UI robustness, reflecting attention to both UX details and backend correctness. Based in Porvoo, Finland, he balances remote-first practices, mentoring, and a data-informed approach to product decisions.
12 years of coding experience
10 years of employment as a software developer
Master of Science (Technology) Mathematics Software Engineering, Master of Science (Technology) Mathematics Software Engineering at Tampere University of Technology 1965-2018
Github Skills (12)
javas10
junit10
web-development10
web-application10
webapp10
vaadin10
java10
testing10
accessibility8
css7
html7
javascript5
Programming languages (7)
Github contributions (5)
vaadin/framework
Jun 2013 - Jan 2014
Vaadin 6, 7, 8 is a Java framework for modern Java web applications.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:11 commits in 6 months
Contributions summary:Jarno's commits primarily focus on enhancing the Vaadin framework, a Java framework for web applications. Their contributions involve bug fixes and feature additions related to form validation, specifically modifying how `BeanValidator` handles exceptions and incorporates multiple error causes. The user also implemented new events for the `AbstractInMemoryContainer` to provide more information about added and removed items, improving data handling within the framework. Additionally, they addressed issues related to UI rendering, like fixing size calculations in IE8 and preventing tooltip display problems in accessibility features.
web-applicationsjava-webvaadin-frameworkweb-application-frameworkjava
jarski/vaadin-phonegap-integration
May 2014 - Jun 2014
Contributions:17 commits, 1 comment in 25 days
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