Simera Professional Key (SPK)

Jonas C

Brasil

Senior Frontend Developer

$ 7,200/month

10+ yrs exp

Senior Full Stack Developer with over 10 years of experience building high-performance, scalable web applications for international teams. Expert in the React ecosystem, specifically Next.js and TypeScript, with a proven track record of leading migrations for high-traffic platforms (5M+ monthly visits). Proficient in comprehensive full-stack development, with deep expertise in backend technologies including Node.js, Python, C# and Go. Strong background in clean architecture, performance optimiza…

Skills

  • AWS
  • Azure
  • Docker
  • Git
  • JavaScript
  • Jira
  • Linux
  • MongoDB
  • MySQL
  • Node.js
  • PostgreSQL
  • Python
  • React
  • Redis
  • Redux
  • Typescript
  • Vue.js
  • JavaScript ES6
  • .NET Core
  • C#
  • Confluence
  • Cypress
  • Django
  • DynamoDB
  • Figma
  • Full Stack Developer
  • GraphQL
  • Jest
  • Material UI
  • Phyton
  • ReactJS
  • Socket.io
  • StoryBook
  • Zustand
  • Python/R
  • RESTful APIs
  • Python3
  • FastAPI
  • Nuxt.js
  • Paython
  • Nest.js
  • Next.js
  • Express
  • Next js
  • GitHub Actions
  • Playwright
  • press
  • Express.js
  • REST APIs
  • MSQL
  • Fullstack developer
  • Vitest
  • Tailwind CSS
  • Fast API
  • Fullstack Development
  • AI Github Copilot
  • Claude Code
  • Full Stack Development
  • Type Script
  • Agile / Scrum
  • Agile/Scrum
  • MariaDB
  • Pytest
  • Full-Stack Development
  • Typescrtipt
  • Agile Scrum
  • Git Action
  • Electron
  • Javascript
  • Electronics
  • Typescripts
  • Go
  • Mongo
  • MaterialUI
  • PostgreQL
  • Pyrhon
  • Agile & Scrum
  • cypress
  • REST API test
  • TypeScript
  • Vue.js 3

Jonas C

Brasil

Senior Frontend Developer

$ 7,200 /month

Part Time: $ 490/month

10+ yrs exp

Intro Video

Senior Full Stack Developer with over 10 years of experience building high-performance, scalable web applications for international teams. Expert in the React ecosystem, specifically Next.js and TypeScript, with a proven track record of leading migrations for high-traffic platforms (5M+ monthly visits). Proficient in comprehensive full-stack development, with deep expertise in backend technologies including Node.js, Python, C# and Go. Strong background in clean architecture, performance optimiza…

Skills

  • AWS
  • Azure
  • Docker
  • Git
  • JavaScript
  • Jira
  • Linux
  • MongoDB
  • MySQL
  • Node.js
  • PostgreSQL
  • Python
  • React
  • Redis
  • Redux
  • Typescript
  • Vue.js
  • JavaScript ES6
  • .NET Core
  • C#
  • Confluence
  • Cypress
  • Django
  • DynamoDB
  • Figma
  • Full Stack Developer
  • GraphQL
  • Jest
  • Material UI
  • Phyton
  • ReactJS
  • Socket.io
  • StoryBook
  • Zustand
  • Python/R
  • RESTful APIs
  • Python3
  • FastAPI
  • Nuxt.js
  • Paython
  • Nest.js
  • Next.js
  • Express
  • Next js
  • GitHub Actions
  • Playwright
  • press
  • Express.js
  • REST APIs
  • MSQL
  • Fullstack developer
  • Vitest
  • Tailwind CSS
  • Fast API
  • Fullstack Development
  • AI Github Copilot
  • Claude Code
  • Full Stack Development
  • Type Script
  • Agile / Scrum
  • Agile/Scrum
  • MariaDB
  • Pytest
  • Full-Stack Development
  • Typescrtipt
  • Agile Scrum
  • Git Action
  • Electron
  • Javascript
  • Electronics
  • Typescripts
  • Go
  • Mongo
  • MaterialUI
  • PostgreQL
  • Pyrhon
  • Agile & Scrum
  • cypress
  • REST API test
  • TypeScript
  • Vue.js 3

Senior Frontend Developer

Britehouse
January 2019 - March 2026

Led the architecture and migration of a high-traffic sports platform (5M+ monthly visits) to Next.js/React, achieving 40% faster load times through SSR/SSG. Optimized cloud infrastructure with edge caching and strategic pre-rendering, reducing server costs by 25% while maintaining peak SEO performance. Implemented robust CI/CD pipelines via GitHub Actions and automated testing (Jest/Playwright), ensuring 99.9% uptime and 85% test coverage. Led integration of AI-assisted coding with Claude Code to streamline the development lifecycle. Built interactive data visualization dashboards with D3.js and Chart.js, enabling data-driven insights and improving operational reporting. Integrated OpenAI API to generate structured outputs from the raw contents for tagging, leveraging LangChain. Established scalable component libraries with Tailwind CSS and Storybook, reducing technical debt while mentoring 5+ developers to improve team velocity. Optimized backend microservices using C# and Python for high-performance data processing and improved system reliability.

Web Team Lead

Cellcrypt
August 2017 - November 2018

Led a critical product rewrite using TypeScript, Node.js, and Python-based API development, increasing system stability by 50% while significantly reducing data processing latency. Enhanced backend performance and data retrieval efficiency via Redis caching, cutting enterprise response times by 35%. Built secure, high-performance Electron applications for encrypted messaging and video conferencing, ensuring strict compliance with enterprise security standards. Developed an administrative Group Management Portal using React and Material-UI to streamline enterprise workflows and improve user management efficiency.

Web Developer

Geo Innovations
March 2017 - August 2017

Spearheaded a monolithic-to-React migration, modernizing the stack with TypeScript and MongoDB to drastically enhance code maintainability and scalability. Replaced legacy jQuery dependencies with a modern, modular styling architecture that reduced visual inconsistencies and style conflicts by 40%. Automated deployment and environment management processes, successfully shortening release cycles by 15% for new frontend updates. Collaborated across the full software development lifecycle to modernize infrastructure, ensuring a seamless transition for the core company portal.

Software Development Scholar

LAPIX – INCOD
August 2012 - November 2014

Refined rendering pipelines for volumetric data visualization, utilizing WebGL to improve processing efficiency by 35% for large datasets. Implemented unit testing for complex 3D graphics modules to ensure high-performance reliability in research applications. Managed deployment configurations for research lab tools, ensuring environment consistency across developer workstations and staging environments. Standardized component styling and UI architecture for data interfaces, reducing development time for new visualization features by 20%.

Smart Scores

Communication
75
Role Fit
98
Adaptability
82
Problem-solving
85

Smart Skills

beta