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.

Pragmatism over perfection — use the right tool for the job
Big achievements are never solo efforts, teamwork is everything
First iterate, then optimize — continuous improvement over big-bang releases
Success comes from collaboration, listening, sharing, and inspiring others

Technologies I work with

Kotlin Go Java Kafka Spring Boot Kubernetes Docker PostgreSQL Symfony Event-Driven Architecture Microservices DDD

Experience

Senior Software Engineer

AUTO1 Group

Apr 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 Autos

Jul 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 Autos

Jan 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.

Feb 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

letgo

Jan 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

Autónomo

Jan 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

Atrápalo

Nov 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

2008 – 2012

Technical Engineering, Computer Systems

Universitat Autònoma de Barcelona

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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