Hi, I'm
Fernando Pradas.
Software Engineer & Distributed Systems
I build secure, scalable distributed systems — from small startups to high-traffic platforms handling 50–100M+ MAUs and 5K–50K RPS. Backend specialist based in Barcelona, with a passion for architecture, reliability, and engineering leadership.
About Me
I'm a Software Engineer with a strong background in secure, scalable distributed systems. I've worked on everything from small businesses to high-traffic platforms like Letgo and OLX, handling 50–100M+ MAUs and 5K–50K RPS.
While my main expertise is in backend development, I also explore SRE and DevOps to improve reliability and performance. I love working at the intersection of technology, leadership, and innovation.
Currently working as Senior Software Engineer at AUTO1 Group, helping consolidate their presence across 30+ European countries.
Technologies I work with
Experience
Senior Software Engineer
AUTO1 GroupApr 2025 – Present
Remote
Europe's leading digital automotive platform, operating in 30+ countries with revenues of ~€6.3B (2024).
- ▸ Building reliable and scalable systems to consolidate AUTO1's presence across Europe.
Backend Chapter Lead
OLX AutosJul 2022 – Aug 2023
Led the evolution of OLX Autos' backend architecture, spearheading the transition from microservices to a fully Event-Driven Architecture. Worked cross-functionally with 4 teams.
- ▸ Defined Kafka-based EDA best practices, reducing response time by 40%.
- ▸ Standardized GitLab CI/CD pipelines, cutting deployment time by 35% and raising success rate to 98%.
- ▸ Integrated SonarQube — improved code coverage by 25% and reduced critical vulnerabilities by 80% in 6 months.
Senior Software Engineer
OLX AutosJan 2022 – Aug 2023
1 year 8 months total at OLX Autos
Helped OLX Autos grow and consolidate in LATAM and other key markets (500K+ cars listed/month, 50K+ inspections).
- ▸ Led full data migration from the legacy platform to the OLX platform.
- ▸ Refactored legacy Java code to Kotlin, integrating unit and integration tests.
- ▸ Implemented anti-corruption layer pattern to build new features with Kotlin + Spring Boot.
Teacher
La Salle BCNFeb 2020 – Jan 2022
Barcelona
Faculty member in the Master's program for High-Performance Web Programming at La Salle (Ramon Llull University), specializing in Development Frameworks.
- ▸ Taught Symfony, dependency injection, ORM, and Domain-Driven Design (DDD) principles with a hands-on approach.
- ▸ Achieved a 4.9/5 rating in anonymous teacher evaluations.
Senior Software Engineer
letgoJan 2018 – Dec 2021
Barcelona
First Spanish startup to achieve unicorn status ($1B+ valuation), with 100M+ downloads and 20M+ monthly active users. Part of the user-focused and authentication team for ~700K daily active users.
- ▸ Built Trust & Safety tooling to mitigate and prevent scams at scale.
- ▸ Collaborated with SecOps to enhance platform security and mitigate external attacks.
- ▸ Maintained User microservices with SLA consistently above 99.99%.
Co-founder & Ethereum Blockchain Engineer
AutónomoJan 2017 – Sep 2018
Co-founded a collaborative crypto platform focused on ICO analysis with community reward mechanics via utility tokens.
- ▸ Designed smart contracts in Solidity (ERC-20, Crowdsale, Airdrop) following OpenZeppelin security standards.
- ▸ Deployed Gnosis multi-signature wallet on testnet and mainnet via Infura API.
- ▸ Successfully deployed all contracts to Ethereum mainnet and launched the ICO in 2018.
Senior Software Engineer
AtrápaloNov 2015 – Jan 2018
Barcelona
Spain's leading travel and leisure platform with significant presence in LATAM. Worked on the ticketing vertical (Atrápalo Eventos).
- ▸ Designed services to sell and manage ticket stock for events and activities.
- ▸ Led migration from monolithic PHP to microservices in Symfony, guided by DDD under CTO Carlos Buenosvinos.
Full Stack Developer
BAB.Dec 2012 – Nov 2015
Barcelona
Small dynamic company (12–14 employees) focused on SaaS CMS/e-commerce solutions and custom client projects.
- ▸ Built MOOC platform (Homuork) and online magazine kiosk (iQUIOSC.cat).
- ▸ Contributed to the initial design and conceptualization of CMS platform (comitium.io).
Education
What's next?
Get In Touch
My inbox is always open. Whether you have a question, a project in mind, or just want to say hi — I'll do my best to get back to you.
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