Sérgio Crisóstomo
Senior Engineering Manager at Klarna
Greater Stockholm Metropolitan Area Sweden
Summary
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Rockstar🎓
Top SchoolSérgio Crisóstomo is a Senior Engineering Manager at Klarna with 12 years of software experience, blending hands-on front-end engineering with people leadership to deliver customer-facing web experiences. Based in Greater Stockholm, he has progressed through engineering roles into group management while maintaining a strong practical background in JavaScript, Vue.js and testing—evidenced by open-source contributions to projects like iView and MooTools where he improved UI components, internationalization and test suites. He also brings uncommon cross-disciplinary depth as a lifelong musician and former music educator and choir director, which informs his collaborative, creative approach to team building and product design. A former CTO and long-time freelancer, Sérgio is comfortable shifting between strategic leadership and code-level problem solving, and he often surfaces UX and internationalization improvements early in the development cycle.
12 years of coding experience
19 years of employment as a software developer
Violin, Conducting, Chamber Music, Orquestra, Violin, Conducting, Chamber Music, Orquestra at Escola Superior de Musica de LisboaViolin, Violin at Conservatório NacionalSecundária Luis de Freitas BrancoBachelor's degree, Mechanical Engineering, Bachelor's degree, Mechanical Engineering at Instituto Superior Técnico
Portuguese, Swedish, French, English, Spanish
Stackoverflow
28,679reputation
5.8mreached
856answers
60questions
mootools
top-1%
mobile-safari
top-5%
reverse
top-5%
dom
top-5%
checkbox
top-5%
javascript
top-1%
Github Skills (40)
javascript10
jquery10
ui-components10
testing10
css10
mootools10
dom-manipulation10
component-kit10
front-end-development10
vue10
html10
jasmine10
frontend10
vue-jsx10
checkbox9
Programming languages (6)
Github contributions (5)
mootools/mootools-core
Feb 2014 - Aug 2017
MooTools Core Repository
Role in this project:
Front-end Developer
Front-end DeveloperContributions:1 review, 109 commits, 40 PRs in 3 years 6 months
Contributions summary:Sérgio's contributions primarily focused on fixing and improving the existing specs related to the MooTools Core library. They addressed issues with element opacity, border radius, and the handling of text input within the framework. The user also worked on ensuring the correct behavior of the code across different versions of MooTools and implemented the correct keypress event handling. The work primarily involves code related to DOM manipulations and browser compatibility.
mootools
iview/iView
Aug 2017 - Sep 2018
Role in this project:Front-end Developer
Front-end DeveloperContributions:204 commits in 1 year 1 month
Contributions summary:Sérgio contributed to the UI Toolkit built on Vue.js by implementing styling and layout improvements. They added vertical alignment to radio groups and incorporated support for internationalization by adding language files for pt-PT and sv-SE. The user also introduced the ability to customize the steps used by the time-spinner component, improving date-picker functionality. Furthermore, the user added unit tests to ensure correct operation of the time and date picker components.
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