Resume

Castro Solutions

Freelance Software Engineer & Architect

Jan 2026 – Present · Alicante, Spain · Remote

• • Freelance backend engineering and software architecture services for clients on AWS and TypeScript.
• • Cloud-native system design: ECS Fargate, SQS, API Gateway, Cognito, RDS, Terraform IaC and CI/CD.
• • Hands-on consulting for migrations, refactors, and reliability, security and observability improvements.

Capgemini

Tech Lead & Software Architect

Aug 2022 – Dec 2025 · Valencia, Spain (Remote)

• • Assigned to the Digital Lab of PostNL (a leading postal and delivery company in the Netherlands), turning prototypes into highly scalable products.
• • Owned the high-level architecture and implementation for a checkout acceleration solution across major e-commerce platforms and payment providers.
• • Engaged directly with client stakeholders to align technical decisions with business needs. Led a team of 5: mentoring, roadmap, prioritization and quality gates.
• • Drove Terraform IaC, Azure DevOps CI/CD, AWS autoscaling and queue-based workflows; ensured end-to-end traceability, reliability, security and observability.
• • Hosted architecture talks as part of Capgemini's Architects department.

Tecon (Ekiba)

Full-Stack Developer

Apr 2021 – Jul 2022 · Parque Industrial del Elche, Alicante, Spain

• • Development of custom applications for medium-sized companies.
• • Led requirements gathering and system design.

Cognizant

Programmer Analyst / Software Developer

Mar 2020 – Apr 2021 · Parque Tecnológico de Boecillo, Valladolid, Spain

• • Functional analysis and development of web applications with a strong client focus.
• • Used modern DevOps practices with continuous integration, following the Scrum framework.

Cognizant

Junior Full-Stack Developer

Jul 2019 – Mar 2020 · Parque Tecnológico de Boecillo, Valladolid, Spain

• • Development and maintenance of web components (logic and styling) used across projects.
• • Unit testing with Karma and Jasmine.
• • Development of Python microservices with scikit-learn to make predictions.
• • Kanban methodology.

Oct 2018 – May 2019 · Salamanca, Spain

• • Study and integration of agile frameworks with the CMMI (Capability Maturity Model Integration) quality standard.
• • Development of internal web applications for Google Assistant using DialogFlow (NLP) through JavaScript.
• • Publication of articles on the ViewNEXT / USAL blog.
• • Collaboration in introductory workshops on agile frameworks.

Makaw

Apr 2021 – Aug 2021

• • App to manage personal expenses and increase savings.
• • Implemented design patterns (Singleton, Observer, Facade) and dependency injection.

makaw-3a1bf.web.app

Yodono — Founder & Developer

Nov 2017 – May 2018

• • Solidarity crowdfunding platform.
• • Managed web platform development, customer acquisition and marketing.

instagram.com/yodono_official

University of Salamanca (USAL)

Bachelor of Computer Engineering

Sep 2014 – Sep 2020 · Salamanca, Spain

• • Focused on software engineering, search and communication algorithms (Java, Objective-C, C#, C).
• • System administration and server development with Perl and CGI.
• • Introduction to AI concepts such as Prolog-based problem solving and logic programming.