My work

Passionate about building impactful digital solutions and enhancing user experiences, I've contributed to projects spanning software engineering, mentoring, and team collaboration. This is an overview of my professional journey:


GeoActio

Software Engineer Frontend (Jul 2025 - Present)

Currently developing the ActioTicket web application using
Next.js
, a platform that enables users to purchase and manage public transportation tickets in Spain. Building intuitive user interfaces with
TypeScript
and implementing comprehensive unit testing to ensure code quality and application reliability. Contributing to modernizing public transportation ticketing systems with digital solutions.

Crombie

AI Lead Engineer - Center of Excellence (May 2025 - Jul 2025)

Served as Technical Lead of Crombie's CoE, a new team focused on designing AI-driven solutions based on client needs. Proposed technical designs for client solutions, from intelligent agents with custom tools to workflows with greater execution control. Translated solutions into requirements for team task division. Utilized technologies such as
Vercel AI SDK
,
AWS
Bedrock, Lambdas, DynamoDB, and Langchain.

Software Engineer Frontend (Nov 2023 - May 2025)

Part of an interdisciplinary team managing Puma e-commerce in the U.S., Canada, UK, Japan, and India. Used
Next.js
with Server-Side Rendering (SSR) to optimize SEO and Client-Side Rendering (CSR) to enhance interactivity. Employed Google Cloud Trace Explorer to detect duplicate queries, reducing Largest Contentful Paint (LCP) by 25% and improving conversion rates. Reduced bundle size by 20% by dynamically importing unnecessary files. Developed middlewares in a custom Next.js server using Node.js and Express.

Ssr. FullStack Developer (Jun. 2023 - Nov. 2023)

Led a team of 4 developers to build Crombie's new website, using
Next.js
with App Router for server-side rendering, improving performance and SEO. Added styles and animations with Tailwind CSS. Used
TypeScript
to improve code quality. Configured Bitbucket pipelines for automated deployments in
AWS
and managed infrastructure with SST (Serverless Stack).

Jr. FullStack Developer (Nov 2022 - Jun 2023)

Developed an MVP for equipment management and preventive maintenance. Built a REST API using
Python
and
Django
Rest Framework and developed interactive user interfaces (forms, tables, dashboards, and charts) using
React
, Vite, React Query, and Material UI. Achieved over 80% test coverage in unit tests.

CAGSA

Industrial Engineer Intern (Jan 2021 - Jan 2022)

I assisted in inventory management and developed an Excel-based system for managing costs and pricing of GAUSS retail products. I also redesigned the plant floor layout to implement a Just-In-Time (JIT) methodology using KANBAN cards.

Let's connect

I'm always interested in discussing new opportunities, collaborating on projects, or just having a conversation about technology and web development.

© 2025 Juan De los Santos. All rights reserved.