Rens Poesse
Freelance Developer at Duolingo
Medellín, Antioquia, Colombia
Summary
👤
Senior🎓
Top SchoolRens Poesse is a versatile freelance full-stack developer with about a decade of experience delivering end-to-end software and leading cross-functional teams. Based in Medellín, he combines hands-on engineering with a strong foundation in behavioral data science and psychology, enabling data-informed, user-centric product development. His technical breadth spans Node.js, PHP, C#, Java, NoSQL/MongoDB, Redis, React and Vue, plus cloud and container tooling (AWS, Docker, Vagrant), and data analysis (R, SPSS). He has steered projects from scratch for clients like Duolingo and Hello Chef, and previously founded Speaky as CTO, demonstrating entrepreneurial leadership alongside hands-on coding. With formal training from the University of Amsterdam, he integrates research rigor with practical software delivery to produce reliable, scalable systems.
10 years of coding experience
9 years of employment as a software developer
MSc, Behavioural Data Science, MSc, Behavioural Data Science at Universiteit van Amsterdam
Dutch, English, Spanish
Github Skills (84)
extendscript10
render10
lottie10
dart-sass10
animations10
node-sass10
loader10
webpack-loader10
animation9
bodymovin9
lumen-framework9
webpack9
sass9
after-effects9
cropper9
Programming languages (4)
Github contributions (5)
renspoesse/uva-study-progress
Jan 2017 - Dec 2022
StudyProgress Dashboard for the University of Amsterdam, 2ndYD
Contributions:24 PRs, 188 pushes, 3 branches in 5 years 11 months
amsterdamdashboard
renspoesse/uva-qualtrics-lti-bridge
Nov 2015 - Jan 2018
Contributions:1 release, 57 commits, 50 pushes in 2 years 2 months
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