Robert Castro Frontend Developer

Frontend L3 expert

Gft

Nov 2025 - Current (1 year)

As a Frontend L3 Expert, I specialized in the implementation of data visualization techniques using tools such as D3, ChartJs, and AGGrid, ensuring that complex data sets were presented in an accessible and engaging manner. My role involved rigorous testing to maintain high-quality standards and utilizing Figma for design prototypes that enhanced user interaction. I focused on responsive web design principles to ensure optimal performance across various devices. Additionally, I leveraged my experience in media handling to optimize the display and performance of images, videos, and other multimedia assets within web applications. This included implementing lazy loading, responsive images, and compression strategies, which ensured efficient m

Frontend L3 expert

GFT Technologies LATAM

Nov 2025 - Current (1 year)

Senior Frontend Engineer at GFT Technologies, working on the Bancolombia account. I design and build operational metrics dashboards that help teams monitor and analyze key business and system indicators in real time. I work mainly with React, Angular, TypeScript, and RxJS, focusing on scalable architecture, reactive data flows, and clean, maintainable code. I also mentor junior developers, supporting their technical growth through code reviews, pair programming, and best practices.

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Spanish Web Developer (HTML/CSS/JS) - AI Data Labeling

OpenTrain

Jan 2025 - Current (1 year 10 months)

As a Spanish Web Developer specializing in HTML, CSS, and JavaScript for AI data labeling, I was responsible for creating and maintaining web applications while ensuring optimal user experience. My role involved annotating and labeling web elements for AI training, which was crucial for enhancing the accuracy of machine learning models. Additionally, I reviewed AI-generated code for accuracy, efficiency, and adherence to best practices, providing structured feedback that contributed to the refinement of AI models in web development. This experience not only honed my technical skills but also deepened my understanding of the intersection between web development and artificial intelligence.

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Frontend Freelance

Liquilegal

Aug 2024 - Current (2 years 3 months)

As a Frontend Freelance developer, I was responsible for the implementation of features and bug fixing on a webpage that generates legal certificates. In addition to my core responsibilities, I collaborated closely with a project leader who was another frontend developer and a backend developer. This teamwork was essential as we communicated effectively to set project planning, resolve issues, and develop the product, ensuring a seamless integration of our efforts to deliver a high-quality final product.

frontend developer

Rebus Technology

Jul 2023 - Current (3 years 4 months)

As a Frontend Developer, I was responsible for designing and implementing user-friendly web applications, ensuring optimal performance and responsiveness across various devices. I collaborated closely with UX/UI designers to translate design concepts into functional interfaces, while also conducting thorough testing to identify and resolve any issues. Additionally, I utilized my knowledge of AI (Inteligencia artificial) by implementing Claude code in local projects, which significantly accelerated development times through enhanced automation and efficiency. This integration not only improved workflow but also allowed for more innovative solutions in the projects I worked on. Furthermore, my experience at Rebus Technology involved working o

Frontend Developer

Rebus Technology

Jul 2023 - Current (3 years 4 months)

As a Frontend Developer, I was responsible for the development and maintenance of user interfaces, translating design definitions into functional components, and implementing services while consuming APIs. My role also involved bug fixing and code refactoring to enhance performance and maintainability. Additionally, I supported the design and planning of digital products. I utilized compiler tools and interpreted compiler error messages to debug and optimize code during software development projects, ensuring a smoother development process and higher quality deliverables.

Senior Frontend developer

NIVELICS

Aug 2025 - Nov 2025 (4 months)

As a Senior Frontend Developer, I led the frontend implementation of a work permits administration system featuring a complex RBAC hierarchy and multi-tenant role isolation. I was responsible for deploying React applications with Next.js to production environments and translating UI/UX designs into functional components. My role involved implementing services and consuming APIs (REST), while actively participating in product design and sprint planning sessions, ensuring effective communication with clients. I built secure routes and middleware, enforcing security protocols, and designed scalable UI architectures for data-intensive applications, ensuring low-latency interactions and predictable state updates. Additionally, I developed advanc

frontend trainee

Rebus Technology

Feb 2023 - Jul 2023 (6 months)

implementacion de sistem design

Frontend trainee

Rebus Technology

Feb 2023 - Jul 2023 (6 months)

Development of practice projects in HTML, CSS, Tailwind, JavaScript, TypeScript, React, and Next.js, with the use of libraries such as Storybook.js, React Hook Form, and React Query.

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Frontend Freelance

Poderosas donaciones

Feb 2022 - Nov 2023 (1 year 10 months)

Implementation of a ticket generation interface for a payment gateway and support for the product.

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Técnico Independiente

Soporte

ESTUDIOS COMPLEMENTARIOS

Robert Castro

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Robert Castro

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Behavioral traits