Esther Sanz
Staff Software Engineer at Return
Spain
Summary
🤩
Rockstar🎓
Top SchoolEsther Sanz is a Staff Software Engineer based in Spain with eight years of experience building backend systems and data platforms across startups and established firms. She brings deep systems-level expertise in Go and C++ alongside practical mastery of both NoSQL and relational databases, frequently operating at the intersection of performance engineering and developer-facing services. Her career shows rapid progression from hands-on engineering at Amadeus and GlobalSign to technical leadership roles at MediaMath and Xata.io, and most recently a Staff role at Return, signaling strong delivery and mentoring capabilities. Colleagues rely on her to turn ambiguous scalability problems into pragmatic, well-tested solutions that balance latency, consistency and operability. Trained in electronics and industrial engineering, she often applies hardware-minded rigor to software reliability and system design decisions. Outside day-to-day coding she favors roles where she can shape architecture and uplift teams while still shipping critical low-level components herself.
8 years of coding experience
14 years of employment as a software developer
Final Year Project, Electronics Engineering, Final Year Project, Electronics Engineering at Katholieke Hogeschool 'Sint-Lieven', GentIngeniería Técnica Industrial especialidad en Electrónica Industrial (Electronics Engineering), Industrial Engineering, Ingeniería Técnica Industrial especialidad en Electrónica Industrial (Electronics Engineering), Industrial Engineering at Universidad Politécnica de Madrid
French, English, Spanish
Github Skills (47)
ddl10
postgresql10
webhooks10
mongodb-driver10
driver10
golang10
replication10
mongodb10
schema10
opensearch9
obfuscation9
database9
elasticsearch9
go8
xata8
Programming languages (3)
Github contributions (5)
xataio/pgstream
Jul 2024 - Apr 2025
PostgreSQL replication with DDL changes
Contributions:1 release, 49 reviews, 159 PRs in 9 months
ddlelasticsearchgolangopensearchpostgresql
eminano/blabber
Sep 2019 - Apr 2024
Contributions:2 pushes, 1 branch in 4 years 8 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.