sys.status — online

Isaac Hermel Reginato

Software Engineer with 4 years of experience in full-stack development, specializing in scalable architectures and performance optimization within the JavaScript/TypeScript ecosystem.

Zenvia

Software Engineer

08/2023 — Present

26% ETL optimization · TTI 5s → 3.2s

Led the end-to-end refactoring of Zenvia Nutrir. Architected a new React front-end utilizing MVVM and standardized Axios network layers, successfully reducing TTI from 5s to 3.2s. Optimized backend Python/Flask RESTful APIs and ETL pipelines for a 26% performance increase. Ensured robust system reliability by eliminating UI sync failures through BDD-driven testing.

ReactMVVMBDDFlaskAxiosData EngineeringETL

Catency

Front-end Developer

04/2023 — 03/2025

LCP < 2.5s · 5 platforms shipped

Engineered high-conversion web interfaces for a B2B client portfolio using Next.js and Tailwind CSS. Applied hybrid rendering (SSG/SSR) for strict SEO indexing control. Executed pixel-perfect implementation with absolute responsiveness and CLS mitigation. Delivered 5 platforms with Core Web Vitals compliance for high organic ranking.

Next.jsTailwind CSSSSG/SSRCore Web VitalsSEO

Umbler

Full-stack Developer

02/2022 — 04/2023

100,000 clients · base automation

End-to-end development with .NET and Blazor for internal Customer Success tools. Structured codebase on the MVC pattern separating data modeling from control interfaces. Customized Bootstrap as the standardized Design System across internal systems. Enabled process documentation, learning paths, and automation of base management for the service team.

.NETBlazorMVCBootstrapInternal Tools

Distributed Systems Lab

5M records57MB RAM7.35ms P9560 FPS

Full-stack monorepo with a scalable webhook ingestion API (NestJS/Fastify, BullMQ), memory-safe data streaming pipeline, and real-time analytics dashboard (Next.js 16, Socket.io, Zustand). Processed 5M records with 57MB RAM via Node.js Streams and Postgres COPY.

NestJSBullMQStreamsWebSocketPostgres

Guarahooks

50 hooks~100 usersshadcn registry

Open-source platform with 50 React hooks. Documentation ecosystem integrated with content-collections and distribution via the shadcn package registry. ~100 active users.

ReactHooksOpen Sourceshadcn

MagicUI

5 components~5KB bundle reduction

Developed 5 visual components for an open-source UI library using React.js, Tailwind CSS, and Framer Motion. Applied Lazy Loading and rendering control via memoization hooks (useMemo, useCallback).

ReactFramer MotionPerformanceUI

Enterprise React Architecture

Shift-LeftTDD/BDDzero regression

Reference implementation for mission-critical React applications. Shift-Left Testing approach using TypeScript, Vitest, and React Testing Library with rigorous TDD/BDD for complex UI domain validation.

ArchitectureVitestTDD/BDDTesting Library

TypeScriptlanguages

Pythonlanguages

React.jsfrontend

Next.jsfrontend

Tailwind CSSfrontend

Framer Motionfrontend

Node.jsbackend

NestJSbackend

.NETbackend

PostgreSQLdatabases

Redisdatabases

Kafkadatabases

Dockercloud

Kubernetescloud

GitHub Actionscloud

AWScloud

Argo CDcloud

Jesttesting

Testing Librarytesting

TDDarchitecture

Isaac Hermel Reginato

Professional Experience

Zenvia

Catency

Umbler

Open-Source & Architecture

Distributed Systems Lab

Guarahooks

MagicUI

Enterprise React Architecture

Technical Stack

Professional Experience

Zenvia

Catency

Umbler

Open-Source & Architecture

Distributed Systems Lab

Guarahooks

MagicUI

Enterprise React Architecture

Technical Stack