Skip to content

About

I like understanding how things work and finding simpler ways to solve technical problems. I combine web development, integrations and automation, using AI when it helps build a better solution or solve a specific need.

Portfolio

Sergio Martín

Integration & Automation Developer

Based in
Salamanca, Spain
Languages
English (C1, fluent) · Spanish (native)
Abroad
Lived and studied in the U.S. for 3 years
Work style
Remote · Cross-functional · Client work
Open to
Remote roles and international relocation

Most of my professional work has been for clients, which has taught me to adapt, work with things that already exist and make decisions within real constraints. Working remotely in a small team also made me quite independent. When I don’t know how to solve something, I’m used to researching, testing and learning through trial and error until I find a way forward.

What motivates me most is having a concrete problem in front of me and something useful to build to solve it. I enjoy the logical side of breaking it down, but also the creative side of deciding how the solution should take shape.

Path

TechnologiesChoose one to see where I learned it and where I used it.

Automation & integrations

Web development

Data & tools

AI & Development

n8n Used at RKPeople

REST APIs Used at RKPeople, Alten

SOAP Used at RKPeople

Webhooks Used at RKPeople

Postman Used at RKPeople, Alten

WordPress Learned at CEI · used at RKPeople

JavaScript Learned at CEI · used at RKPeople

PHP Used at RKPeople

HTML5 Learned at CEI · used at RKPeople

CSS3 Learned at CEI · used at RKPeople

JSON Used at RKPeople

XML Learned at CEU · used at RKPeople

SQL Learned at CEU · used at Alten

Google Sheets Used at RKPeople

Git Learned at CEU

Zoho CRM Used at RKPeople

Claude Code Part of how I work every day

ChatGPT Part of how I work every day

AI-assisted development Part of how I work every day

  1. Jun 2024 – Sep 2026

    Frontend Developer

    RKPeople · Barcelona, Spain (remote)

    • Developed and maintained web solutions for multiple clients using WordPress, JavaScript, PHP, HTML and CSS.
    • Integrated forms, external APIs, CRM systems and automations to connect tools and improve processes.
    • Built an n8n workflow to consolidate booking data from multiple hotels, working with SOAP, webhooks, XML/JSON and Google Sheets.
    • Developed a multi-step lead generation system connected to external APIs, including validations, lead creation, duplicate handling and tracking using UTMs, gclid and CID.
    • Worked with REST APIs, Postman and third-party system integrations, including testing, debugging and troubleshooting.
    • Managed migrations, maintenance, support and technical issue resolution across multiple projects.

    Projects from this role

    Technologies here: n8n, REST APIs, SOAP, Webhooks, Postman, WordPress, JavaScript, PHP, HTML5, CSS3, JSON, XML, Google Sheets, Zoho CRM.

  2. Sep 2023 – Dec 2023 · Internship

    Full Stack Developer

    Alten · Madrid, Spain

    • Developed and maintained REST APIs.
    • Worked with relational databases and data operations.
    • Tested and validated endpoints and requests using Postman.
    • Contributed code to collaborative development projects.
    • Developed custom web interfaces and pages.
    Technologies here: REST APIs, Postman, SQL.

  3. 2023 – 2024 · Education

    Full Stack Development Bootcamp

    CEI · Madrid, Spain

    HTML, CSS, JavaScript, React, Node.js, Vite, MongoDB, Figma, WordPress

    Technologies here: WordPress, JavaScript, HTML5, CSS3.

  4. 2021 – 2023 · Education

    Higher National Diploma in Multiplatform Application Development

    CEU · Madrid, Spain

    Java, Python, C#, SQL, Git, OOP, XML, Android Studio, Unity

    Technologies here: XML, SQL, Git.

  5. 2019 – 2021 · Education

    Higher National Diploma in Administration and Finance

    CEU · Madrid, Spain

Open to integration, automation and technical implementation roles.