Jefferson Fernandes
Senior Product Engineer at ElectionBuddy
São Paulo, Brazil
Summary
👤
Senior🎓
Top SchoolJefferson Fernandes is a Senior Product Engineer based in São Paulo with 14 years of hands-on experience building backend-heavy, production-grade web applications. He brings deep expertise in Ruby on Rails and relational and NoSQL datastores—PostgreSQL, Redis, Elasticsearch and MongoDB—having shipped complex systems across startups and product teams. Recently he’s transitioned toward AI engineering, integrating LLMs, vector DBs and RAG pipelines and experimenting with graph databases like Neo4j to surface richer product intelligence. After a long tenure at Vizir and a senior full‑stack role at TridentAB, he now shapes product and engineering at ElectionBuddy, blending product sensibility with implementation rigor. A pragmatic engineer who took a sabbatical to recharge and refocus, he pairs decade-plus system design experience with a clear trajectory toward applied AI in real-world products.
14 years of coding experience
9 years of employment as a software developer
University of São Paulo
English, Portuguese, Spanish, French
Github Skills (6)
social-media4
image-text3
image-gallery3
web-platform3
rss3
cms2
Github contributions (5)
JeffsFernandes/camisoteca
Sep 2018 - Mar 2019
Contributions:1 push, 3 branches in 6 months
JeffsFernandes/devise_postgre_example_app
Apr 2012 - Apr 2012
Contributions:3 commits in 1 day
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