Bart Feenstra
Eigenaar at Instaware installatietechniek B.V.
Gelderland, Netherlands
Summary
👤
Senior🎓
Top SchoolBart Feenstra is an entrepreneurial sales and new-business specialist with over a decade of hands-on experience building and running companies in the Netherlands, combining roles from founder to partner manager. He blends deep commercial expertise—cold calling, account management, mentoring and training—with practical software development for sales automation, evidenced by meaningful open-source contributions to a PHP GraphQL implementation. Comfortable in B2B markets from insurance to publishing, he has a track record of turning outreach into revenue and refining customer-facing processes like objections handling and closing techniques. Based in Gelderland, he pairs an Hbo-rechten background with a tinkerer’s mindset—automating workflows and improving developer-facing error handling—making him equally at home advising strategy or shipping code.
13 years of coding experience
8 years of employment as a software developer
Hbo rechten, Hbo rechten at Hogeschool van Amsterdam
English, German
Github Skills (10)
graphql10
error-handling10
php10
graphql-php10
validation10
wordpress-graphql10
wpgraphql10
validations10
graphql-schema10
phpunit10
Programming languages (16)
Github contributions (5)
youshido-php/GraphQL
Jun 2017 - Jul 2017
Pure PHP realization of GraphQL protocol
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 commits, 1 PR, 4 comments in 5 days
Contributions summary:Bart primarily focused on improving the error handling and validation processes within the GraphQL implementation. Their commits demonstrate a strong understanding of the project's core logic, modifying code related to input object types, non-nullable types, and list types. They addressed bugs and refined the error messages to provide more specific and helpful feedback to users. The user also made improvements to the overall code quality by fixing whitespace and removing an unneeded validation error message.
graphql-clientgraphql-phpphpgraphqlgraphql-schema
Commercie/currency-exchange
May 2015 - Jul 2016
Contributions:38 commits, 2 PRs, 4 pushes in 1 year 2 months
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