Demian Caldelas
Senior Software Engineer at PeakActivity
Vicente López, Buenos Aires, Argentina
Summary
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SeniorDemian Caldelas is a Senior Software Engineer with a decade-long track record building and scaling web applications across JavaScript/TypeScript, React, Next.js and Laravel. He’s led remote teams and driven migrations from legacy desktop systems to modern web platforms, notably steering a Next.js-based Association Management System and enhancing multi-tenant real estate platforms with robust feed-processing and SSO. An active open-source contributor, Demian has improved front-end UX and test coverage in high-impact projects like cal.com, showing attention to both polish and reliability. His background spans enterprise banking systems (Java, Spring Boot, COBOL) to serverless architectures, giving him a rare blend of legacy-system experience and modern cloud-native practice. Based in Vicente López, Buenos Aires, he pairs a hands-on engineering style with a curiosity for AI tools and continuous learning. Outside work he credits fatherhood, tennis and guitar with sharpening patience, empathy and creative problem solving.
5 years of coding experience
11 years of employment as a software developer
English
Stackoverflow
380reputation
20kreached
11answers
3questions
Github Skills (18)
typescript10
nextjs10
typescript-types10
typescripts10
react10
tailwindcss9
tailwind9
prisma8
trpc7
html6
redirect6
angular6
parceljs6
pdf6
next-auth6
Programming languages (10)
Github contributions (5)
calcom/cal.com
Feb 2022 - Apr 2022
Scheduling infrastructure for absolutely everyone.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:7 reviews, 20 commits, 24 PRs in 2 months
Contributions summary:Demian primarily contributed to the front-end aspects of the application, implementing features, fixing bugs, and improving the user interface. They worked on components, including the shell, modal, and login pages, and also addressed issues in event type management and booking pages. Furthermore, the user demonstrated proficiency in testing, adding unit tests and addressing E2E test failures, indicating a focus on code quality and reliability within the project. The user also made contributions to the back-end code, such as fixing a double forward slash in the auth callback.
tailwindcssturborepotrpcprismascheduling
denik1981/autopush
Sep 2022 - Sep 2022
Contributions:233 PRs, 241 pushes, 196 branches in 3 days
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