Sergi Graupera
Organizer at Tidy Slice
Barcelona, Catalonia, Spain
Summary
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Rockstar🎓
Top SchoolSergi Graupera is a seasoned software architect and entrepreneur with 14 years crafting JVM-based systems and leading tech startups from Barcelona. As organizer of Spring I/O and Wasm I/O and a core member of javaHispano, he blends deep hands-on expertise in Spring, Kafka, RabbitMQ and event-driven architecture with community-building at scale. He has co-founded multiple ventures (including Voz.io and PayTouch) and served as CTO and senior trainer at Confluent, translating complex distributed systems into practical, teachable patterns. An active backend contributor to the open-source conference-ticketing project alf.io, he’s improved invoicing, iCalendar invites and HTML email support—showing a pragmatic focus on real-world operational issues. His profile pairs academic computer science training with a track record of shipping production systems across fintech, telecom and conference tooling.
14 years of coding experience
7 years of employment as a software developer
Master's Degree, Computer Science, Master's Degree, Computer Science at Karlsruhe Institute of Technology (KIT)Bachelor's degree, Computer Science, Bachelor's degree, Computer Science at Escola Universitària Politècnica de Mataró (EUPMT)UPC Universitat Politècnica de Catalunya
English, Spanish, Catalan, German
Stackoverflow
8,234reputation
728kreached
78answers
0questions
spring-mvc
top-5%
java
top-1%
spring-security
top-5%
websocket
top-1%
spring
top-1%
dependency-injection
top-1%
Github Skills (26)
event-handling10
spring10
websocket10
java10
javas10
spring-boot10
eventsource10
eventing10
ticket-system10
dependency-injection10
video-conferencing9
apidoc9
spring-mvc9
spring-security9
api9
Programming languages (7)
Github contributions (5)
alfio-event/alf.io
Jun 2019 - Apr 2020
alf.io - The open source ticket reservation system for conferences, trade shows, workshops, meetups
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 7 PRs, 5 comments in 10 months
Contributions summary:Sergi contributed to the `alf.io` project, which is a ticket reservation system. Their work focused on backend functionalities, including fixing issues related to invoice generation, specifically addressing VAT and ticket price calculations. They also addressed type mismatch errors and added support for custom email features, and improving the iCalendar invite. Further contributions involved HTML email template support.
eventreservation-systemtradeticketingconferences
salmar/spring-websocket-chat
Sep 2014 - Mar 2018
Contributions:41 commits, 3 PRs, 27 pushes in 3 years 7 months
spring-bootwebsocketschat-applicationchatwebsocket
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