Fredrik Wallgren - Co-Founder at Sayon

Fredrik Wallgren

Co-Founder at Sayon

Barcelona, Catalonia, Spain

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Summary

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Senior

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Top School

Fredrik Wallgren is a pragmatic full-stack engineer and serial founder with 16 years of experience building web and backend systems across Ruby, Go, Java and JavaScript. Based in Barcelona, he co-founded Nuna after leading and scaling backend microservices at Typeform and running his own consultancy Sayon, blending hands‑on coding with product-minded technical leadership. He contributes to open-source tooling—improving projects like go-arg and the wsdl2phpgenerator—and has a track record of tightening error handling, docs and UX in community projects like Lobsters. Comfortable across Linux, macOS and Windows, he moves between web front-ends, APIs and infrastructure, and often surfaces small usability improvements that make systems more robust in production.

16 years of coding experience

10 years of employment as a software developer

Science, Science at University of Skövde

Swedish, English

Stackoverflow

Stats

364reputation

15kreached

4answers

0questions

Badges

pdf

top-5%

Github Skills (22)

ruby-rails10

wsdl10

rails10

ruby10

php10

go10

argument-parsing10

forum10

golang10

error-handling10

unit-testing9

soap9

pdf9

sql9

code-documentation8

Programming languages (5)

ShellCoffeeScriptGoPHPRuby

Github contributions (5)

wsdl2phpgenerator/wsdl2phpgenerator

Feb 2010 - Nov 2013

Simple utility and class library for generating php classes from a wsdl file.

Role in this project:

Back-end Developer

Contributions:43 commits in 3 years 9 months

Contributions summary:Fredrik primarily focused on enhancing the `wsdl2phpgenerator` utility. Their contributions involved updating the codebase, adding documentation, and addressing issues related to primitive types. They also made modifications to the core files, including `Wsdl2PhpGenerator.php`, `Wsdl2PhpValidator.php`, and `src/Service.php`, and the test files to reflect the changes and ensure functionality. These changes improved the utility's usability and stability.

class-librarywsdlphpsoap-client

alexflint/go-arg

Nov 2015 - Mar 2016

Struct-based argument parsing in Go

Role in this project:

Back-end Developer

Contributions:9 commits, 13 PRs, 21 comments in 3 months

Contributions summary:Fredrik primarily focused on improving the `go-arg` library's argument parsing functionality. Their contributions include fixing bugs related to error handling and outputting error messages to `stderr`. They added features, such as including default values in the help output and allowing overriding default values for slice arguments. Furthermore, they improved the usability of the library by adding options to the help output and fixing issues with the display of default values in the usage information.

golanggoparsingargument-parsingstruct

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