Flavio Junqueira
Chief Technology Officer at Qbeast
Barcelona, Catalonia, Spain
Summary
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Rockstar🎓
Top SchoolFlavio Junqueira is a seasoned CTO and distributed systems expert with 18 years of experience building fault-tolerant infrastructure and streaming platforms across research labs and industry, currently leading technology and product roadmap at Qbeast in Barcelona. His deep technical roots include contributions and leadership at Apache (ZooKeeper, BookKeeper, Kafka) and key roles at Dell EMC, Confluent, Microsoft Research, and Yahoo! Research, blending hands-on kernel-level fixes with strategic architecture for data management. Known for improving leader election, controller stability, and ZK security migrations in widely used projects like Apache Kafka and ZooKeeper, he combines rigorous research instincts (PhD-level training) with production-hardened engineering. He’s equally comfortable refactoring core APIs for systems like Pravega and designing memory- and exception-safe components in BookKeeper, making him rare among executives who still ship critical backend code. An active Apache PMC member and committer, he brings both community stewardship and practical operational experience to scale data-intensive systems.
18 years of coding experience
12 years of employment as a software developer
University of California, San DiegoMSc Electrical Engineering - Computer Networks, MSc Electrical Engineering - Computer Networks at COPPE/UFRJBSc Electrical Engineering, BSc Electrical Engineering at Universidade Federal do Rio de Janeiro
English, Portuguese, Spanish, French, Catalan
Stackoverflow
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Github Skills (45)
algorithm10
api-rest10
consensus10
back-end-development10
controller10
apidoc10
api-design10
restful-api10
testing10
user-authentication10
authentication10
kafka10
distributed-systems10
zookeeper10
java10
Programming languages (6)
Github contributions (5)
pravega/pravega
Nov 2016 - Aug 2021
Pravega - Streaming as a new software defined storage primitive
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 releases, 89 reviews, 148 commits in 4 years 9 months
Contributions summary:Flavio primarily focused on refactoring and enhancing the core functionality of the Pravega streaming platform. Their contributions involved renaming and modifying classes within the `clients/streaming` package, and refactoring aspects of the transaction API in the `controller` package. They also made changes to the service initialization and management within the service/server directory, specifically related to segment container manager initialization and time out issues. Further contributions include adding scope management capabilities.
streaming-datadistributed-storagereal-time-datadefineddata-ingestion
apache/bookkeeper
May 2011 - Jul 2015
Apache BookKeeper - a scalable, fault tolerant and low latency storage service optimized for append-only workloads
Role in this project:Back-end Developer
Back-end DeveloperContributions:31 reviews, 112 commits, 4 PRs in 4 years 3 months
Contributions summary:Flavio primarily contributed to the Apache BookKeeper project by addressing issues related to memory management and exception handling within the ledger cache and related components. They modified code related to ledger entry pages and the handling of exceptions in the cache, as well as making adjustments to the NIO server factory. Their work also touched upon the BookKeeper client library, specifically implementing a new API for adding entries with offsets and lengths.
fault-tolerantapache-bookkeeperbookkeeperfaultstorage
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