Projects

Fullstack BE-heavy developer passionate about TypeScript and PHP, committed to building innovative and practical solutions.

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How MDX can accelerates document creation in websites

Overview See how MDX solves the problem of writing extremely long pages or articles. In...

#mdx#react#programming
Read more

About

Hi, I'm Hállex, Hállex Costa, Fullstack Developer.
enthusiastic about using technology to build innovative solutions. I focus on backend-heavy fullstack work with TypeScript and PHP, delivering complete products that solve real problems.

Backend

PHP 7.4+PHP 8.3+LaravelYii2Node.jsExpressFastifyNest.js

Databases

PostgreSQLMySQLSQLiteMongoDBRedisPrismaTypeORMKnex.js

DevOps

DockerDocker ComposeGitGitHubGitHub ActionsCI/CDCloudflareDigitalOcean

Frontend

TypeScriptJavaScriptReact.jsNext.jsNullstackTailwindStyled Components

Tools

ViteBabelRollupJestTesting LibraryChaiMocha

Constant Learning

System DesignClean ArchitectureDomain-Driven Design (DDD)Event-driven systemsObservabilityKubernetes

Technologies I work with daily and love: TypeScript / Node.js / PHP / Nest.js / React / Docker

Hállex Costa

Timeline

Present8 months
Neoplan (Freelance)
Fullstack Developer|Yii2, PHP, Redis, Docker, GitHub Actions, Cloudflare, DigitalOcean
Earlier4 months
FATEC Araçatuba
Intern|PHP, Adonis 4, React, TypeScript

Work experience: 4+ years

Education

FATEC3 years
FATEC — Araçatuba
Systems Analysis and Development
ETEC1 year 5 months
ETEC — Araçatuba
Technical education in technology

Projects

Be a Savior

TypeScriptNode.jsAPIFullstack

A fullstack platform focused on NGO and donor workflows, with a TypeScript backend designed for real product usage.

Highlights

  • •Server-side APIs for NGO and donor management
  • •Provisioned and scaled multiple backend and frontend instances
  • •Built for practical charity and donation use cases

Live demo available for exploring the product flow.

Notifications Service

TypeScriptNest.jsMicroserviceNotifications

A notifications microservice focused on reliable delivery and clean service boundaries.

Highlights

  • •Dedicated notification domain as an independent service
  • •TypeScript backend with practical messaging concerns
  • •Deployed service endpoint for experimentation

Useful reference for modular backend services.

Clickpix SDK

TypeScriptSDKPaymentsPIX

An SDK-oriented POC around PIX payments, focused on clean integration surfaces for product teams.

Highlights

  • •Reusable SDK surface for payment integration
  • •TypeScript-first approach for safer client consumption
  • •Public demo for validating the integration experience

Built to explore payment SDK ergonomics in practice.

Animes United

TypeScriptReactMobileProduct

A personal product experiment around anime discovery and community features across web and mobile.

Highlights

  • •TypeScript web platform for anime content
  • •Companion mobile repository for cross-platform experience
  • •Explores catalog and community-oriented UX

A passion project combining product and engineering practice.

Habits Tracker

TypeScriptReactFrontendProductivity

A lightweight habits product focused on daily consistency and a simple tracking loop.

Highlights

  • •Track recurring habits with a focused UI
  • •TypeScript frontend for maintainable product code
  • •Public Netlify deployment for quick demos

Small product, clear UX, practical engineering.

Design Patterns TypeScript

TypeScriptDesign PatternsArchitecture

A learning-oriented repository documenting design patterns with TypeScript examples.

Highlights

  • •Practical pattern implementations in TypeScript
  • •Useful as a reference for clean architecture discussions
  • •Complements day-to-day backend and frontend design decisions

Built to reinforce fundamentals through code.

Articles

01
6 min read

How MDX can accelerates document creation in websites

Overview See how MDX solves the problem of writing extremely long pages or articles. In...

#mdx#react#programming
Read more
02
2 min read

Resilient Node.js servers without using docker

Overview Now you will learn how we create resilient services without interrupting the main...

#node#docker#webdev#programming
Read more
03
2 min read

Woovi monorepos best practices

Summary Look the conflict between dependencies version Always update the packages...

#woovi#programming#development
Read more

Contacts

Let's connect. Feel free to reach out for collaboration or a conversation.

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