Hi, I'm Ernesto Núñez.
Full Stack Developer.

Full Stack developer focused on modern interfaces and scalable solutions...

Learn more about me

7+

Years of Exp.

30+

Projects

100%

Commitment

Ernesto Nuñez Marrero, Full Stack developer in Santo Domingo, Dominican Republic

Current Status

Building the next generation of web applications

Technical Toolkit

I specialize in a modern tech stack focused on performance, scalability, and exceptional user experience.

Frontend

ReactJSNext.jsAngularAstroVue.jsJavaScriptTypeScriptMaterial UICSSHTMLReduxMicro-Frontends

Backend

Node.jsRedisExpress.js.NET.NET CorePythonGraphQLREST APIsGolangJest

Database

MySQLMongoDBSQL ServerPostgreSQLAWS DynamoDBFirebase FirestoreMariaDB

DevOps

AWS ServerlessAWS LambdaAWS API GatewayAWS S3AWS CloudFrontAWS IAMAWS CloudWatchAWS EC2DockerCI/CDVercelLinuxGIT

Mobile

React NativeExpoiOSAndroidMobile UI/UX

Featured Projects

A selection of my recent work, ranging from web applications to design systems.

Next.js Modules and Service Integrations for Thryv

Next.js Modules and Service Integrations for Thryv

Development of scalable Next.js modules and service optimizations using React, Node.js, and a microservices architecture. Enhanced UI performance and user experience across the platform.

Next.jsNode.jsReactExpressTailwind
Flask to GraphQL Migration

Flask to GraphQL Migration

Complete service migration from Flask to GraphQL, achieving improved response times, optimized data retrieval, and fully automated testing coverage.

PythonGraphQLpytestAPI Design
Backend to GraphQL Migration (Django)

Backend to GraphQL Migration (Django)

Modernized a backend into a Django-based GraphQL API: schema design, query/mutation resolvers, and a pytest test suite to ensure stability and long-term maintainability.

PythonGraphQLpytestDjango
Medical Clinic Management System

Medical Clinic Management System

Application to manage patients, appointments, and billing with secure authentication (Cognito) and an AWS serverless backend. Stripe payments integration and data synchronization with DynamoDB and Lambda, delivered as a desktop experience via Electron.

ReactAWSCognitoAmplifyElectronDynamoDBLambdaStripe
US Business Insurance Management

US Business Insurance Management

Platform to manage policies, quotes, and renewals for US businesses, with operational dashboards and approval workflows. React frontend and .NET/C# backend, integrating AWS services for scalability and security.

.NETC#ReactAWS
WordPress Extension with Micro-Frontend Architecture

WordPress Extension with Micro-Frontend Architecture

Advanced WordPress extension supporting email campaigns, logo builders, landing pages, and automation—powered by a robust micro-frontend architecture.

ReactTypeScriptMicro-Frontend.NET
Administrative Portal for User & Reporting Management

Administrative Portal for User & Reporting Management

Administrative portal built with React, Redux, and .NET Core for managing reports, user profiles, integrated services, and advanced modules.

ReactReduxC#.NET Core
Premium Reservation Mobile App

Premium Reservation Mobile App

Mobile app for premium banking clients with multi-language support, secure payments, and reservation management for VIP airport lounges.

React NativeJavaScriptPaymentsMobile
Web & Mobile Toll Management Platform

Web & Mobile Toll Management Platform

Comprehensive toll system with user profiles, balance management, recharge features, reporting, ERP integration, and mobile apps for iOS/Android.

Vue.jsReact.NETMobilePayments
Proyfin — Personal Finance Platform

Proyfin — Personal Finance Platform

Full-stack development of a personal finance app with income/expense tracking, AI-assisted categorization (OpenAI), and debt reminders. Automated biweekly email summaries and payment reconciliation via n8n workflows, Stripe subscriptions, a PWA with push notifications, and a full test suite (Jest + Playwright) on Neon Postgres.

Next.jsTypeScriptMUINeon PostgresStripeOpenAIn8nPWA
Alianca ERP — Multi-Tenant Platform for SMBs

Alianca ERP — Multi-Tenant Platform for SMBs

Built Alianca's multi-tenant ERP from the ground up: real authentication with AWS Cognito and per-tenant URL scoping, Contacts/Income/Accounting modules, and a shared hooks layer (pagination, CRUD, sorting) reused across every module to speed up development. Pixel-accurate implementation of the Figma design system, including full light/dark mode support.

Next.jsTypeScriptTailwind CSSshadcn/uiAWS CognitoTanStack Query
Alianca Reportes — DGII Invoicing & Tax Reports

Alianca Reportes — DGII Invoicing & Tax Reports

Electronic invoicing and tax reporting platform (606/607) for the Dominican Republic. Invoice extraction engine built on AWS Textract with incremental template learning, a serverless backend (Cognito, DynamoDB, S3, EventBridge, SQS, Lambda), recurring billing with Stripe, and Google OAuth authentication.

Next.jsTypeScriptMUIAWS TextractDynamoDBLambdaStripe

Let’s Work Together

I am currently available for freelance projects and full-time roles. If you have a project that needs a creative touch, I’d love to hear about it.

Location

Santo Domingo, Dominican Republic