Federico Antonio Yarza Castillo

Senior Full Stack Developer | React, Next.js, Node.js, NestJS, TypeScript

Valencia, Venezuela

About me

Senior Full Stack Developer with 8+ years of experience building scalable web and mobile applications with React, Next.js, Node.js, NestJS, TypeScript, PHP, Laravel, SQL, Docker and CI/CD. Experienced in enterprise systems, Microservices, REST APIs, Cloud Computing, Agile, Scrum, Leadership, Mentoring and Collaboration with cross-functional teams.

Work Experience

Epidata

Senior Full Stack Developer

Jan 2023 - Present
Senior Full Stack Developer for enterprise platforms, multi-country digital products and legacy modernization using Next.js, NestJS, TypeScript, PHP, SQL, Docker, CI/CD, Microservices, Cloud Computing and Agile/Scrum practices.
- Led ANII modernization by migrating a legacy PHP 5.3 ecosystem to PHP 8.2, improving maintainability, security posture and long-term platform scalability
- Established automated testing standards with 80%+ coverage on shared packages, improving regression control and release confidence
- Delivered multi-country internationalization with next-intl for 5 countries: Argentina, Colombia, Chile, Uruguay and Paraguay
- Built NestJS 10.x backend services and Microservices using Domain-Driven Design, Hexagonal Architecture, REST APIs and SQL integrations
- Shipped Cloud Computing workloads with Docker, CI/CD pipelines and Kubernetes deployments on the Vanguard platform
- Designed a Turborepo monorepo with pnpm workspaces for Gabrica Hub, standardizing shared packages, build pipelines and Collaboration across multiple applications
- Implemented a Next.js Multi-Zone architecture to unify B2C, B2B and regional applications under a single domain
- Mentored developers through code reviews, architecture guidance, Leadership and Agile/Scrum delivery practices
Devinol S.A

Full Stack Mobile Developer

Mar 2022 - Oct 2022
Full Stack Mobile Developer focused on React Native applications, offline-first features, geolocation, API integrations, performance and user experience.
- Designed and developed Fitlogger, an offline-first React Native fitness application, improving reliability for users with limited connectivity
- Optimized geolocation features for the Myngly dating application, improving location accuracy, map interactions and mobile performance
- Led the full refactoring of a restaurant beverage search application, improving maintainability and feature delivery speed
Freelance

Technology Consultant and Independent Developer

Jul 2020 - Apr 2022
Independent consultant delivering web and mobile solutions for ERP, e-commerce, analytics dashboards, automation and education platforms.
- Delivered 5 production platforms spanning ERP integration, e-commerce, analytics dashboards, social automation and education management
- Implemented e-commerce solutions with multiple payment integrations, improving checkout flexibility for client businesses
- Built analytical dashboards and data management interfaces for operational reporting and decision-making
- Designed a social media automation platform to centralize campaign management and workflow execution
- Created an education management platform with attendance tracking, grades control and administrative workflows
Rv. Medios C.A.

Full Stack Developer with Specialization in Enterprise Solutions

Jun 2018 - Jun 2020
Full Stack Developer for enterprise web systems, accounting platforms, payment modules and digital transformation projects using React, Vue.js, Laravel, PHP and SQL.
- Built the LECOMP B2B portal on Profit Plus 200 ERP (SQL Server) with 12+ sub-portals, 70+ RBAC permissions and ~30 stored procedures covering quotes, dual-currency payments, IVA retentions and operational reporting
- Implemented a Microservices architecture for a wholesale system, improving modularity and backend maintainability
- Built a custom Prestashop payment module to support tailored checkout and transaction flows
- Delivered digital transformation projects for Rv. Medios, Vepaco, Cobertura y Tasas and Lecomp
- Built full stack web applications with React.js, Vue.js, Laravel, PHP, SQL and REST APIs

Education

Facultad Experimental de Ciencias y Tecnología - Universidad de Carabobo

2008 - 2018

Bachelor's Degree in Computer Science

Projects

Postulaciones ANII •

Proposal registration system for Uruguay's human capital. Legacy modernization from PHP 5.3 to PHP 8.2 using SOLID architecture.

PHP 5.3 to 8.2 migrationModern architecture with SOLID principlesComprehensive form management system
ANII Form Generator •

System responsible for the administration of different forms that are opened in application calls

Dynamic form administrationApplication system
CVUy •

Uruguay's human-capital CV platform. Maintenance and evolution of the Angular frontend together with the PHP backend.

Angular frontendPHP backendForms, data entry, and day-to-day system operations
Cofaral •

Accounting and tax ERP where I worked full stack: Node.js and NestJS backend on MySQL, and a JavaScript, TypeScript, and React frontend.

Full stack on NestJS (Node.js) microservices and REST APIsJavaScript/TypeScript frontend with ReactAccounting and tax domain: accounts and production operations
Vanguard (Epidata) •

Multi-service repository based on microservices with a Java (Spring Boot) backend and a Next.js web frontend, including local Docker infrastructure and Kubernetes deployments.

Java 17 + Spring Boot 3.x microservices (Maven) with an API Gateway (Spring Cloud Gateway) and JWT filtersNext.js 15 frontend with a modern UI stack (Tailwind/Radix) and Bun-based build pipelineLocal development infrastructure via docker-compose (SQL Server, Redis, Seq) and per-service environment configurationPer-service CI/CD with GitHub Actions: build, push to GHCR, and deploy to Kubernetes (self-hosted runners)Automated code quality with SonarQube via dedicated workflows per service
Gabrica Hub •

Multi-country digital hub built with Next.js and NestJS to consolidate B2C, B2B, MV and Ethics channels across 5 countries, with 80%+ test coverage.

Monorepo with TurborepoMulti-Zone architecture with Next.jsDDD + Hexagonal ArchitectureMulti-country: Argentina, Colombia, Chile, Uruguay, ParaguayTesting with 80%+ coverage
LECOMP B2B Portal

Private B2B web portal built on top of the legacy Profit Plus 200 / Admin Plus 200 ERP (SQL Server) for Lecomp International Group C.A., a Venezuelan automotive parts importer and distributor. Exposes the order-to-cash cycle — quoting, picking, invoicing, payments, IVA retentions, and reporting — to clients, sales reps, accountants, and administrators through a modern server-rendered web UI.

Laravel 5.7 monolith (~58 controllers, 223 Blade views); thin HTTP layer that delegates all business logic to the ERP via stored proceduresSQL Server integration: ~30 stored procedures (sysweb_pProcesarCotizacion, reports, Bs/USD pricing) and 3 sqlsrv connections (sysweb_ + native Profit Plus tables)Dual-currency Bs/USD with daily exchange rate, discount engine, photo-evidence payment workflow, and IVA retentions aligned with SENIAT/Venezuela workflowsRBAC with Caffeinated Shinobi (70+ permission slugs), single-device sessions, and 20-minute idle timeoutReporting via server-side DataTables, JasperReports, DomPDF, and Maatwebsite Excel (XLSX import/export with logos and dynamic column widths)12+ sub-portals: orders/quotes, picking/sales rep, payment confirmation, retentions, catalog, pricing, daily rate, and CMS
Fletamos •

React Native logistics mobile app for Latin America connecting cargo owners (shippers) with transporters for shipment management and real-time tracking.

React Native 0.70 + React Navigation 6; Redux Toolkit with persistence (redux-persist/thunk) and feature-based organizationShipper and transporter roles: onboarding, vehicles/trailers, drivers, and a multi-step shipment creation flow (route, cargo, payments)Map tracking with react-native-maps and geolocation; search, history, and shipment statusReal-time updates via Pusher/Laravel Echo; in-app chat; push notifications with Firebase and NotifeePayments (Venezuela mobile payment, BS/USD transfers); Firebase Auth and Google Sign-InUI with Native Base and twrnc utilities; Formik/Yup and react-hook-form; REST client with Axios
Autokratic •

React Native (Expo) mobile app for an automotive marketplace connecting buyers and sellers: search, VIN scanning, AI recommendations, messaging, purchase flow, and a dedicated dealer dashboard.

React Native 0.71 + Expo ~48 + TypeScript; navigation with React NavigationState with MobX, MobX-State-Tree and layered architecture (repository pattern, API layer with apisauce)Buyers: marketplace with filters, VIN scan, favorites, payments and reports; dealers: inventory, publishing and lead managementMulti-language i18n (English, Spanish, Arabic, Korean) with RTL; light/dark theme and push notificationsGoogle and Apple sign-in, OTP verification; Jest tests and Detox E2E
RZGroupSAS •

React Native (Expo) fleet management and transportation app for RZ Group: truckers, company clients, and administrators with services, vehicles, accounting, payments, and documentation.

React Native 0.71 + Expo 48 + TypeScript; role-based navigation with React Navigation (separate tab stacks per role)State with MobX and MobX-State-Tree; layered architecture (API via apisauce with JWT)Truckers: vehicles, services, expenses, and documents; companies: service monitoring, expenses, and payments; admin: user management and oversightAccounting and charts (ECharts), high-performance lists (Flash List), documents and PDF; Expo modules (camera, print, sharing)OTP authentication, role-based registration, Jest tests; optional E2E (e.g. Maestro)
WhereMobile •

React Native (Expo) location-sharing app for contacts: “Where?” pings, interactive map, per-contact timeline, and push notifications.

React Native 0.69 + Expo ~46 + TypeScript; React Navigation (stack and tabs)MobX and MobX-State-Tree (auth, user, contacts, location); UI with twrnc and Formik + YupContact management with swipe actions; location pings and map via react-native-mapsLocation history timeline per contact; push via expo-notifications; Expo location and contacts permissionsDistributed backend (main API + contacts and location microservices); Jest, Detox, and Storybook
CoallyApp •

React Native (Expo) mobile app connecting students with educational and training opportunities, with AI-assisted support.

React Native 0.76 + Expo 52 + TypeScript; Ignite 10 boilerplate with a layered structureState with MobX and MobX-State-Tree; persistence with MMKV and AsyncStorageDashboard, profile, training catalog, and opportunities modules; authentication and school selectioni18next across multiple languages (es, en, fr, hi, ar, ja, ko); light/dark theme and environment-based configUI with twrnc, Reanimated, and bottom sheets; REST APIs via apisauce and Reactotron debugging
Myngly •

Dating app using geotagging technology

Mobile applicationGeolocationDating system
Fitlogger •

App to monitor workouts and fitness progress

Mobile applicationOffline-firstWorkout tracking

Skills

HTML - Web development, Frontend, Markup
CSS - Web development, Frontend, Responsive Design, Tailwind CSS
JavaScript - Web development, Frontend, Backend, Fullstack, ES6+
Tailwind - Web development, Frontend, CSS Framework, Responsive Design, Utility-first CSS
TypeScript - Web development, Frontend, Backend, JavaScript Superset, Type Safety
Node.js - Web development, Backend, JavaScript, Server, REST API
MySQL - Databases, SQL, Data Storage, Backend, Relational Database
SQL Server - Databases, SQL, Data Storage, Backend, Microsoft SQL Server, Store Procedure, Triggers, Functions
PostgreSQL - Databases, SQL, Data Storage, Relational Database
Git - Version Control, Collaboration, Source Code, Version Control
GitHub - Version Control, Collaboration, Source Code, Git, CI/CD
Next.js - Web development, Frontend, React Framework, SSR, Static Generation, App Router
React - Web development, Frontend, JavaScript Library, UI, React 19, Hooks
PHP - PHP Development, Backend, Laravel, Wordpress, Symfony, PHP 8.2
NestJS - Backend Development, Backend, Node.js, JavaScript, TypeScript, Microservices, DDD, Hexagonal Architecture
Python - Backend Development, Backend, Python, Flask, Django, FastAPI
Docker - Docker, Containers, Virtualization, DevOps
Vue.js - Web development, Frontend, JavaScript Framework, UI
Vitest - Testing, Frontend, Unit Testing, Test Runner
Jest - Testing, Backend, Unit Testing, Integration Testing
React Testing Library - Testing, Frontend, Component Testing, React
Storybook - UI Development, Documentation, Component Library, Design System
Turborepo - Monorepo, Build System, Task Runner, pnpm
TanStack Query - State Management, Data Fetching, Caching, Server State
Zustand - State Management, Client State, React, Lightweight
React Hook Form - Forms, Validation, React, Performance
Zod - Validation, TypeScript, Schema Validation, Type Safety
next-intl - Internationalization, i18n, Next.js, Multi-language
Cloud Computing - AWS, Azure, Cloud Computing, Cloud Architecture, Kubernetes, Docker
Microservices - REST APIs, API Gateway, NestJS, Spring Boot, Kubernetes
Leadership - Team Leadership, Mentoring, Collaboration
Agile - Agile, Scrum, Leadership, Team Leadership, Collaboration, Mentoring

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