Carlos Piles

About me

Senior backend engineer (10+ years). Owner of business-critical systems (payments, auth) on a high-traffic product. I build scalable, reliable backends (DDD, hexagonal, DevOps) with one focus: shipping product that works in production, with AI as leverage.

Experience

1. Senior Backend Engineer · Leadtech Group

   November 2019 - Present · 6 years, 8 months

   • Owned the payments infrastructure (revenue-critical) of a high-traffic product —hundreds of thousands of users— at 99.9% uptime.
   • Led the backend for the product's international expansion (new markets, multi-region).
   • Led the design and build of the NestJS/TypeScript backend platform (4 years), following an earlier Symfony project (2 years).
   • Drove the backend architecture (hexagonal + Domain-Driven Design) and set the team's patterns and standards to scale without tech debt.
   • Mentored the backend team's junior engineers and led code reviews, raising the team's quality and consistency.
   • Designed the data layer (SQL + NoSQL) and automated CI/CD and cloud infrastructure with Docker for faster, more reliable delivery.

2. Backend Developer · Habitissimo

   July 2018 - October 2019 · 1 year, 3 months

   • Implemented backend architecture improvements with Symfony and MySQL.
   • Introduced CI/CD to speed up and stabilize deployments.

3. Full Stack Developer · Autoclick Rent a Car

   October 2017 - June 2018 · 8 months

   • Independently built the complete HR management system: NodeJS backend and Angular frontend.

4. Full Stack Developer · Runator Startup

   October 2016 - September 2017 · 11 months

   • Developed and optimized the REST API with PHP, Symfony and MongoDB.

5. Full Stack Developer · Various development projects

   September 2014 - December 2016 · 2 years, 3 months

   • Built custom web solutions (PHP, WordPress) and maintained infrastructure for various companies and startups.

Skills

Tools