Juan C.

I designed and implemented the core backend systems from scratch using a pure Node.js + TypeScript stack. I applied Domain-Driven Design (DDD) and event-driven architecture, focusing on clean, maintainable code without ORMs or heavy frameworks. I modeled complex fiscal and accounting domains through aggregates, value objects, and bounded contexts, collaborating closely with product and tax experts. I built a custom event bus to enable asynchronous workflows and domain event propagation, along with critical cronjobs and background processes for VAT declarations, invoice reconciliations, and automated tax reporting. AI Integration & Automation:

• Leveraged Google Vision API for OCR on invoices and financial documents, combined with LLMs such as GPT-4.1 mini or Gemini 3.6 Flash and Claude for intelligent data extraction, inference of accounting concepts, validation, and enrichment of fiscal data. • Used AI-powered tools (Cursor + Claude) daily to accelerate code generation, refactoring, and documentation of DDD modules. • Designed intelligent document processing pipelines that combine OCR + LLMs to automatically extract, understand, and reconcile financial documents, significantly reducing manual work and increasing accuracy.

I maintained full ownership of the backend lifecycle from domain modeling to production deployment while refactoring legacy code toward cleaner architectural boundaries. My contributions improved system scalability, reliability, and helped foster a high-standard engineering culture through code reviews and architectural discussions.

• Provided personalized tutoring to U.S. university students, offering guidance on career paths, skill development, and personal growth.
• Assisted students in crafting resumes tailored for software engineering roles, preparing for interviews, and expanding professional networks to facilitate their transition into the job market.
• Identified and recommended conferences and workshops that equipped learners with insights into complex coding concepts, algorithms, data structures, and industry best practices.
• Simplified challenging technical topics to promote deep comprehension and demystify advanced programming concepts, fostering confidence and mastery in students.

• Developed backend systems using Nest.js, adhering to Domain-Driven Design (DDD) and microservices architecture.
• Facilitated communication between microservices via GRPC and TCP protocols.
• Implemented a queue system for efficient microservices communication using RabbitMQ.
• Monitored and addressed errors with tools like Grafana and SonarQube.
• Managed infrastructure on both Azure and AWS platforms.
• Configured and maintained CI/CD pipelines using GitHub Actions.
• Created frontend applications with React, following atomic architecture principles.
• Designed user interfaces with Tailwind CSS and SASS.
• Managed application state effectively using Redux.
• Built and documented component stories using Storybook and collaborated with Figma for design integration.
• Utilized the Adapter pattern for seamless HTTP communication with microservices.
• Applied software development principles such as DRY, KISS, and SOLID to ensure code quality and maintainability.
• Conducted comprehensive testing using Jest, Cypress, Testing Library, and WebDriver IO for unit, integration, and end-to-end testing.

• Developed backend systems using NestJS, adhering to Domain-Driven Design (DDD) and microservices architecture.
• Facilitated communication between microservices via GRPC and TCP protocols.
• Implemented a queue system for efficient microservices communication using RabbitMQ.
• Monitored and addressed errors with tools like Grafana and SonarQube.
• Managed infrastructure on both Azure and AWS platforms.
• Configured and maintained CI/CD pipelines using GitHub Actions.
• Created frontend applications with React, following atomic architecture principles.
• Designed user interfaces with Tailwind CSS and SASS.
• Managed application state effectively using Redux.
• Built and documented component stories using Storybook and collaborated with Figma for design integration.
• Utilized the Adapter pattern for seamless HTTP communication with microservices.
• Applied software development principles such as DRY, KISS, and SOLID to ensure code quality and maintainability.
• Conducted comprehensive testing using Jest, Cypress, Testing Library, and WebDriver IO for unit, integration, and end-to-end testing.

• Developed web applications using React and TypeScript, implementing Domain-Driven Design (DDD) and clean architecture principles.
• Managed application state effectively with Redux.
• Conducted unit, integration, and end-to-end testing using Jest and Cypress to ensure application reliability and quality.
• Applied software development principles, including DRY, KISS, and SOLID, to maintain clean and efficient codebases.
• Utilized Ant Design for building reusable and visually consistent UI components.
• Implemented reusable CSS methodologies based on the BEM convention for maintainable styling.
• Designed responsive interfaces using SASS, adopting a mobile-first approach with mixins and variables.
• Deployed applications within Docker containers for consistent and scalable environments.

• Developed web applications using React and TypeScript, implementing Domain-Driven Design (DDD) and clean architecture principles.
• Managed application state effectively with Redux.
• Conducted unit, integration, and end-to-end testing using Jest and Cypress to ensure application reliability and quality.
• Applied software development principles, including DRY, KISS, and SOLID, to maintain clean and efficient codebases.
• Utilized Ant Design for building reusable and visually consistent UI components.
• Implemented reusable CSS methodologies based on the BEM convention for maintainable styling.
• Designed responsive interfaces using SASS, adopting a mobile-first approach with mixins and variables.
• Deployed applications within Docker containers for consistent and scalable environments.

• Developed and delivered comprehensive software engineering courses on topics including Testing, Fullstack Software Engineering, and Software Analysis and Design.
• Instructed students in manual and automated software testing methodologies, covering foundational concepts such as software quality standards, Test-Driven Development (TDD), the testing pyramid, and white box and black box testing, using technologies like Jest, Vitest, Testing Library, and Cypress.
• Taught the Fullstack MERN technology stack, encompassing MongoDB, Express.js, React, and Node.js, to provide students with industry-relevant skills.
• Designed and implemented practical labs, coding exercises, and projects to reinforce theoretical concepts and ensure hands-on learning.
• Guided and mentored students in test-driven development (TDD) and agile software development practices to prepare them for real-world scenarios.
• Organized and led workshops and hackathons, fostering hands-on experience, collaboration, and innovation among students.

• Analyzed, designed, and implemented the company's technology stack to meet strategic objectives and operational needs.
• Defined a technical roadmap aligned with team requirements, outlining milestones to be achieved within a year.
• Created a core engineering team to effectively communicate the company's technical requirements across all teams.
• Established internal processes to ensure optimal knowledge transfer and collaboration within the engineering teams.
• Analyzed and defined technical career paths to foster internal talent development and align it with organizational goals.
• Recruited, trained, and built new engineering teams to undertake upcoming projects and scale the company's operations efficiently.

• Developed mobile applications for Android and iOS platforms using Ionic 4 and Ionic 5 frameworks.
• Built and integrated backend services with Firebase, including authentication, Cloud Functions, Firestore, and other Firebase tools.
• Designed and implemented Node.js-based backend APIs, incorporating functionalities such as mailing, authentication, encryption, and MongoDB integration.
• Managed deployment tasks and scripting for various cloud services, including Digital Ocean, Heroku, and AWS.
• Utilized Git, GitLab, and Bitbucket for version control, adhering to workflows based on Gitflow methodology.
• Developed frontend and web applications using Angular and Vue, ensuring responsive and user-friendly interfaces.

• Developed web applications for projects such as Ikea Taiwan, Ikea Family (Santo Domingo and Spain), and the Ventajon Project.
• Implemented web solutions using PHP frameworks, including Symfony and Laravel, with version control managed through Subversion (SVN).
• Designed, structured, and developed the frontend for the new Ventajon project, ensuring a modern and responsive user experience.
• Developed backend APIs for the Ikea Family and Ventajon projects using Symfony 3, enabling seamless integration and functionality.
• Administered and optimized SQL databases, including MySQL and PostgreSQL, to support application performance and scalability.
• Managed web deployment processes and system architecture, providing reliable support for the company's proprietary web applications.

• Developed web applications for projects such as Iketa Taiwan, Ikea Family (Santo Domingo and Spain), and the Ventajon Project.
• Implemented web solutions using PHP frameworks, including Symfony and Laravel, with version control managed through Subversion (SVN).
• Designed, structured, and developed the frontend for the new Ventajon project, ensuring a modern and responsive user experience.
• Developed backend APIs for the Ikea Family and Ventajon projects using Symfony 3, enabling seamless integration and functionality.
• Administered and optimized SQL databases, including MySQL and PostgreSQL, to support application performance and scalability.
• Managed web deployment processes and system architecture, providing reliable support for the company's proprietary web applications.

• Led the design, layout, and development of web applications for platforms, including inmovirtual.eu, plusvirtual.com, and rv360.live.
• Developed web applications using JavaScript, jQuery, and Python (web2py), focusing on integrating modern frameworks such as SASS and AngularJS.
• Enhanced functionality by integrating Google Maps and Analytics APIs into web applications for improved mapping and tracking capabilities.
• Managed web architecture, including hosting and domain configurations, ensuring seamless user experiences and application stability.
• Designed, implemented, and maintained MySQL databases to support application data storage and retrieval.
• Developed virtual testing environments to simulate production scenarios and ensure the reliability of web applications.
• Optimized website performance by improving loading speeds, file compression, and structured code normalization.
• Focused on improving SEO positioning and ensuring high usability standards to enhance user engagement and visibility.
• Configured and managed the Nginx web server, overseeing tasks such as website redirects, encryption, file compression, and implementing HTTP/REST protocols.
• Set up and maintained testing environments on a NAS server, utilizing Apache .htaccess for configuration and access control.
• Provided ongoing technical support, troubleshooted issues, and ensured the smooth functioning of web applications.
• Facilitated virtual tours using 360-degree cameras, expanding the applications' capabilities and enriching user experiences.