Open to opportunities

Charles Hidalgo

@charleshidalgo

Message

Senior full-stack and infrastructure engineer specializing in SaaS, automation, and cloud architectures.

Spain

Message

What I'm looking for

I seek engineering roles focused on SaaS, automation, and cloud infrastructure where I can drive architecture, integrate APIs, and implement CI/CD and reliable automated workflows.

I am a senior full-stack and infrastructure engineer with 5+ years building SaaS platforms, workflow automation, and API integrations. I combine backend development, DevOps, and product-focused engineering to deliver robust, scalable systems.

As Co-founder & Lead Developer at GestionoMiNegocio, I designed a Symfony 7 + Next.js SaaS architecture, implemented Docker-based deployments, and built CI/CD and testing automation that reduced production errors by 70% and onboarded multiple beta users.

I have led consulting and tech-lead engagements modernizing legacy systems, designing microservices, and optimizing VPS/AWS infrastructures. I regularly implement integrations with e-invoicing, Twilio, Slack, PrestaShop, WordPress, and OpenAI Platform.

I prioritize practical automation and reliable infrastructure: building RAG systems, integrating local models with SaaS apps, and applying automated pipelines with n8n to accelerate delivery and reduce operational risk.

Experience

Work history, roles, and key accomplishments

Current

Freelance AI & Automation Engineer

Current

Independent

Jan 2023 - Present (2 years 11 months)

Built RAG systems, integrated local models and OpenAI Platform with SaaS apps, and designed multi-SaaS automated workflows using n8n, Slack, Twilio and external APIs.

RAG N8n OpenAI Python Automation Docker

Current

Program Specialist

Current

Vita Liber S.L.U

Jan 2021 - Present (4 years 11 months)

Migrated legacy systems to modern Symfony 7 architecture, developed REST APIs and managed MariaDB databases while implementing automated testing and Docker-based CI/CD pipelines.

Symfony PHP REST APIs MariaDB Docker CI CD Automated Testing DevOps

Current

Co-founder & Lead Developer

Current

GestionoMiNegocio

Jan 2020 - Present (5 years 11 months)

Designed and implemented a SaaS architecture with Symfony 7, Next.js and API Platform; built CI/CD pipelines and automated workflows, reducing production errors by 70% and onboarding 8+ beta users.

Symfony Next.js Docker CI CD PHP Automation

Current

Consultant & Tech Lead

Current

Fastbyte SL

Jan 2019 - Present (6 years 11 months)

Designed scalable architectures, modernized legacy systems, led microservices and API integrations, and provided DevOps and VPS/cloud optimization consulting for SaaS clients.

Architecture Microservices APIs DevOps AWS Docker Systems Integrations PHP

Webmaster

Seedstockers

Jan 2023 - Dec 2024 (1 year 11 months)

Managed multilingual PrestaShop e-commerce, handling site administration, integrations and performance optimizations across 2023–2024.

PrestaShop Integration PHP Performance Optimization

Developer

240dots

Jan 2020 - Dec 2023 (3 years 11 months)

Implemented API integrations and built WordPress and Next.js projects, delivering multilingual and integrated front-end/back-end solutions from 2020–2023.

Next.js WordPress API Integration JavaScript PHP REST