Francisco Sierra
Full Stack Engineer at Zylon
Madrid, Community of Madrid, Spain
Summary
🤩
Rockstar🎓
Top SchoolFrancisco Sierra is a Full Stack Engineer with 10 years of experience building consumer and IoT-connected mobile products, currently shaping features at Zylon after senior Android roles at Grupo MASMOVIL and BQ. He combines strong Android expertise with serverless and reactive architectures (Firebase enthusiast) to deliver polished apps that have shipped on millions of devices and supported hardware like 3D printers and wearables. A collaborative teammate who prioritizes learning and healthy team dynamics, he brings practical knowledge of Clean Architecture, SOLID principles, and cross-platform integration. Ambitious to gain international experience, he pairs a developer’s curiosity—gamer and fitness enthusiast—with a pragmatic focus on shipping reliable, testable software.
10 years of coding experience
9 years of employment as a software developer
Fast Track Nanodegree Program Android development, Fast Track Nanodegree Program Android development at UdacityMultiplatform Application Development Computer Programming, Multiplatform Application Development Computer Programming at Study Centre Cepal
Spanish, English
Stackoverflow
12,857reputation
912kreached
132answers
64questions
android
top-5%
camera
top-5%
firebase
top-1%
google-cloud-firestore
top-5%
firebase-realtime-database
top-5%
sqlite
top-5%
Github Skills (79)
firebase10
firebase-authentication10
reactive10
firebase-realtime-database10
mapper10
firebase-database10
database10
crashlytics10
storage10
wrapper10
firebase-cloud-messaging10
firebase-functions10
kotlin10
firebase-storage10
rxjava10
Programming languages (5)
Github contributions (5)
FrangSierra/RxFirebase
Nov 2016 - Sep 2020
Rxjava 2.0 wrapper on Google's Android Firebase library.
Contributions:17 releases, 114 commits, 43 PRs in 3 years 10 months
firebase-databasefirebase-functionsrxjavafirebase-dbstorage
FrangSierra/Firebase-Coroutines-Android
Mar 2019 - Sep 2020
Contributions:6 commits, 3 pushes in 1 year 6 months
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