Pantelis Vratsalis
Senior Fullstack Engineer at Perspective
Municipality of Sparta, Peloponnese, Western Greece and the Ionian
Summary
🤩
Rockstar🎓
Top SchoolPantelis Vratsalis is a Senior Fullstack Engineer with 13 years of experience designing and scaling backend and full-stack SaaS systems, specializing in authentication, entitlements, pricing platforms, and developer experience tooling. He blends hands-on expertise in Python, Ruby, Node.js and React with cloud-native architectures, and has recently focused on building AI developer tools like MCP servers and a VS Code MCP extension. A proven technical leader, he has owned cross-team initiatives, designed APIs and distributed systems, and mentored engineering teams while remaining deeply involved in implementation. His open-source contributions include backend API work and OAuth fixes for the widely used Mattermost platform, reflecting a practical emphasis on security and integrations. Based in Sparta, Greece, he pairs engineering depth with product-minded leadership rooted in prior co-founder experience and an MBA background.
13 years of coding experience
12 years of employment as a software developer
MBA, Business Administration, MBA, Business Administration at Athens University of Economics and BusinessMBA, Business, Marketing, Entrepreneurship, MBA, Business, Marketing, Entrepreneurship at Rotterdam School of Management, Erasmus UniversityB.Sc, Physics, B.Sc, Physics at University of Crete
English, Greek
Stackoverflow
361reputation
33kreached
14answers
0questions
Github Skills (27)
javascript10
back-end-development10
apidoc10
typescript10
go10
api10
front-end-development10
typescript-types10
typescripts10
react10
jes9
redux9
chartjs9
jtest9
oauth9
Programming languages (8)
Github contributions (5)
mattermost/mattermost-webapp
Aug 2022 - Jan 2023
Archived web app of Mattermost. Moved to the monorepo: https://github.com/mattermost/mattermost
Role in this project:
Front-end Developer
Front-end DeveloperContributions:152 reviews, 36 commits, 72 PRs in 4 months
Contributions summary:Pantelis primarily contributed to the Mattermost web application, focusing on enhancements to the user interface and front-end functionality. Their work included implementing a new version announcement bar, fixing issues with line breaks in code blocks, and upgrading various front-end dependencies such as Redux and Chart.js. They also made improvements to analytics charts, accessibility, and general UI layout and responsiveness.
webapphttps-servermattermostmattermost-server
mattermost/mattermost
Oct 2022 - Jan 2023
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Role in this project:Back-end Developer
Back-end DeveloperContributions:65 reviews, 5 commits, 46 PRs in 2 months
Contributions summary:Pantelis contributed to the Mattermost platform by addressing translation conflicts and fixing issues related to OAuth redirect URI parameters. They made changes to the server-side code, specifically the API for groups and OAuth functionalities. The user modified the codebase by adding several checks to the API and modifying the state parameter, indicating a focus on backend functionalities and API integrations.
golangsecuredevelopment-lifecyclelifecyclereact-native
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