Guillermo Sierra
@guillermosierra
Senior Frontend & Mobile Developer with a focus on UX.
SpainWhat I'm looking for
I'm Guillermo Sierra, a Senior Frontend and Mobile Developer based in Barcelona, Spain. With extensive experience in leading frontend development for various platforms, I specialize in creating immersive user experiences through optimized UI/UX design. My current role at Laurel Gaming involves spearheading the frontend development of a gaming platform, where I utilize React Native and TypeScript to enhance user engagement.
As the founder of Divenamic, I have successfully built a diving marketplace that emphasizes user experience, leveraging hybrid web and mobile solutions. My previous roles at Holded and BodBoca allowed me to develop scalable UI components and mobile-first e-commerce platforms, respectively, using technologies like React, Next.js, and GraphQL. My journey in software engineering began with a solid educational foundation from EPFL and UPC, where I honed my skills in telecommunications and software engineering.
Experience
Work history, roles, and key accomplishments
Senior Frontend Developer
Laurel Gaming
Nov 2023 - Present (2 years 7 months)
Led frontend development for a gaming platform, optimizing UI/UX for immersive user experience using React Native and TypeScript.
Founder
Divenamic
Jul 2023 - Present (2 years 11 months)
Created a diving marketplace focusing on UX, building hybrid web and mobile solutions with React Native and Firebase.
Senior Frontend Developer
Holded
Feb 2023 - Jun 2024 (1 year 4 months)
Developed scalable UI components and improved application performance for Holded's accounting software using React, Next.js, and GraphQL.
Senior Mobile Developer
BodBoca
Jan 2023 - Jan 2024 (1 year)
Developed a mobile-first e-commerce platform with React Native, Firebase, and GraphQL, focusing on seamless UX and scalable architecture.
Android Developer
Amadeus
Mar 2017 - Sep 2017 (6 months)
Worked on core mobile booking system, implementing performance improvements using Kotlin and Java.
Android Developer
SEAT
Sep 2016 - Mar 2017 (6 months)
Developed the proof-of-concept Android app for connected vehicles using NFC technology and Java.
Education
Degrees, certifications, and relevant coursework
École Polytechnique Fédérale de Lausanne
Master of Science, Software Engineering
2016 - 2018
Final Degree Project in Software Engineering.
Universitat Politècnica de Catalunya
Bachelor of Science, Telecommunications Engineering
2010 - 2016
Telecommunications Engineering.
Tech stack
Software and tools used professionally
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