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SENIOR REACT DEVELOPER

Ivan Diaz

React · Next.js · TypeScript

I build and scale production web apps with React, Next.js and TypeScript — from frontend architecture to the APIs behind them.

Hire me on UpworkWhat I do
5+ yrs
React & TypeScript in production
−30%
faster after legacy rebuilds
4
product teams shipped for
01

What I build for clients

Scoped work you can hand off and trust to land — from a single feature to a full product.

01

Frontend Architecture

React / Next.js apps built to scale — state management, performance and a component library your team can keep building on.

02

Feature Development

Ship new features into your existing React or .NET app, from design through deployment, without breaking what already works.

03

Performance & Modernization

Refactor a slow or dated frontend into something fast and maintainable — past projects cut load times by 15–30%.

04

APIs & Integration

Need the backend too? Clean, documented REST APIs on Node.js or .NET, wired to the frontend end to end.

02

The full stack, top to bottom

One person across every layer — no handoffs, no gaps between frontend and backend.

FRONTEND
  • React
  • Next.js
  • TypeScript
  • Redux
  • Zustand
  • Jest
BACKEND
  • .NET
  • Node.js
  • Express
  • REST APIs
DATA
  • SQL Server
  • MongoDB
CLOUD & TOOLING
  • Azure
  • AWS (S3, IAM)
  • Git
  • Jira
03

Where I've worked

Product teams at companies shipping to millions of users.

  1. Nexaminds

    OCT 2024 — PRESENT

    Fullstack Developer L3

    Build React/Next.js apps and REST APIs for an enterprise platform connecting vendors and carriers. Led a legacy frontend modernization that cut load times by 30%, and designed the global state layer with Zustand.

  2. Brightcove

    SEP 2022 — AUG 2024

    Software Engineer

    Shipped features and critical fixes for a high-traffic React/TypeScript streaming service. Maintained AWS infrastructure (S3, IAM) and refactored legacy code to cut load times by 15%.

  3. Tech Mahindra

    SEP 2021 — SEP 2022

    Software Developer

    Front-end consultant building a React/Redux/TypeScript SPA with production support, responsive design and a reusable component library that reduced duplication.

  4. Infobip

    FEB 2021 — SEP 2021

    Fullstack Developer

    Designed a new UI for a billing system and built a RESTful API for secure data transfer, improving the finance team's efficiency.

04

Selected work

Case studies in progress. Client work under NDA — these are builds I can show end to end.

IN PROGRESS

Analytics Dashboard

React + .NET admin panel with role-based access, CRUD and live metrics. Full case study coming soon.

  • React
  • Next.js
  • .NET
  • SQL Server
PLANNED

Booking System

Appointment scheduling app with calendar, notifications and a customer portal.

  • Next.js
  • Node.js
  • MongoDB
AVAILABLE

Your project here

Have something in mind? This slot is open — let's talk about what you need built.

  • React
  • .NET
  • Azure
05

Let's build something

Available for part-time freelance — evenings & weekends. Currently taking on freelance projects — send a short note about what you need built and I'll get back to you.

ivan@lowtus.meUpworkLinkedInGitHub