I'm always interested in connecting with people who are building interesting things. Whether it's a new project, a technical challenge, or an opportunity to collaborate, I'm happy to start a conversation and see how I can contribute.

Phone / WhatsApp

+55 11 95067-3025

Location

São Paulo, SP - Brazil

Social

zelio
zelio
<span>

Hey, I’m William

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Senior {Full Stack}Web developer_

<p>With expertise in cutting-edge technologies such as NodeJS, AWS, AngularJS, and MongoDB. 15+ years building scalable logistics and enterprise web platforms.</p>

...and more
[ Download my CV ]
zeliozelio

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Year Experience

+

Cloud Servers Managed

+

Databases Managed

+

Enterprise Integrations

Services

Designing customized solutions
to meet your requirements

Full-Stack Web Development

Building scalable web applications using JavaScript, Node.js, and modern frontend frameworks. From responsive interfaces to robust backend services and APIs.

Cloud Infrastructure

Deploying and managing cloud environments on AWS, including EC2, load balancing, and scalable backend services designed for high availability.

Database Architecture

Designing and maintaining scalable databases using MongoDB, PostgreSQL, and modern data architectures for high-performance applications.

API & System Integration

Designing and integrating RESTful APIs to connect platforms, services, and enterprise systems, enabling reliable communication between applications.

Performance & Scalability

Optimizing applications for speed and scalability, improving backend performance, database queries, and frontend rendering efficiency.

Security & Best Practices

Applying secure development practices based on OWASP guidelines, ensuring authentication, data protection, and resilient application architecture.

Excited to take on new projects and collaborate.
Let's chat about your ideas. Reach out!

zelio
Projects

Some of my Projects

Casa Matagal

Casa Matagal
institutional website

Built a modern institutional website for Casa Matagal to showcase their premium metalwork services. The site focuses on visual presentation, responsive design, and clear calls-to-action to convert visitors into potential clients.

  • Project Info
  • Client

    Casa Matagal

  • Project Type

    Institutional Website

  • Technologies

    WordPress, HTML, CSS

  • Year

    2026

zelio

RoutEasy
Logistics Platform

Development of a logistics route optimization platform used by companies to plan and manage delivery routes. I initially worked on the frontend and landing page, later contributing as a full-stack developer on the platform’s core features and system architecture.

  • Project Info
  • Client

    RoutEasy

  • Project Type

    Logistics SaaS Platform

  • Technologies

    Node.js · Express · AngularJS · MongoDB · JavaScript · HTML5 · CSS3

  • Year

    2015~2024

zelio

Nickiwi
Social Platform

Development of a social platform focused on users of multi-level marketing systems. The platform supported more than 100,000 registered users and included social features, user interaction, and scalable backend services.

  • Project Info
  • Client

    SDR Produções Artísticas

  • Project Type

    Social Network Platform

  • Technologies

    PHP · Laravel · MongoDB · Redis · Backbone.js · jQuery · AWS

  • Year

    2013

zelio

Fernanda Motta
Official Website

Development of a one-page website for the international model Fernanda Motta. The project included social media integrations and a responsive interface focused on showcasing media content and public presence.

  • Project Info
  • Client

    Safari Digital Media Production

  • Project Type

    One Page Website

  • Technologies

    HTML5 · CSS3 · jQuery · Social Media APIs

  • Year

    2014

zelio

Gillette Avengers
Campaign Website

Frontend development and final adjustments for the Gillette Avengers campaign website before its official launch. The work focused on responsive layout improvements and final UI refinements.

  • Project Info
  • Client

    HIVE Digital Media

  • Project Type

    Marketing Campaign Website

  • Technologies

    HTML5 · CSS3 · jQuery · SASS

  • Year

    2015

zelio

500 Melhores
Ranking Platform

Development of a content platform that ranked the best establishments in major Brazilian cities based on public voting. The project combined a news portal with a ranking system where users could discover and vote for top businesses across categories such as food, beauty, culture, and leisure.

  • Project Info
  • Client

    Yotta Seven Comunicação

  • Project Type

    Content Platform

  • Technologies

    PHP · Smarty · MySQL · HTML5 · CSS3 · jQuery

  • Year

    2011

zelio

My Resume

I believe that working hard and trying to learn every day will
make me improve in satisfying my customers.

Core Expertise

Full Stack Development

Building complete web applications from frontend interfaces to backend services and APIs.

SaaS & Platform Architecture

Designing scalable platforms including authentication, data modeling, and system integrations.

Performance & Optimization

Improving application performance, database queries, and frontend responsiveness.

Product Development

Transforming product ideas into functional platforms used by real users.

Experience

2015 - 2024

Full Stack Developer & DevOps at RoutEasy

Node.js · Express · AngularJS · MongoDB · JavaScript · HTML5 · CSS3

2010 - 2016

Co-Founder & Full Stack Developer at Y7

PHP · Smarty · MySQL · HTML5 · CSS3 · jQuery

2014

Frontend Engineer at Safari.to

HTML5 · CSS3 · jQuery · Social Media APIs · SASS

2011 - 2013

Web Developer at HL4 Ambiental

Photoshop · Illustrator · Corel Draw · PHP · MySQL · HTML5 · CSS3 · jQuery · JavaScript · WordPress

Cloud . Code . User Interface

Let’s connect

Phone / WhatsApp
+55 11 95067-3025
Email
hello@williamkennedy.com.br
GitHub
williamknn
Location
São Paulo, SP - Brazil