Maurício is currently unavailable
Maurício André Cinelli
Verified Expert in Engineering
CSS Developer
Campinas - State of São Paulo, Brazil
Toptal member since January 22, 2021
Bio
Mauricio is a seasoned full-stack web developer with 15 years of experience, specializing in Ruby on Rails and prominent JavaScript frameworks like React, Ember.js, and Vue. His expertise extends to building chat systems from scratch and implementing AI agents for work-related tasks using OpenAI and Claude Agent SDK. With a strong track record in startups and small to medium-sized companies, Mauricio excels in adapting to new environments and delivering top-notch web solutions.
Portfolio
Simplero ApS
Email deliverability, Email infrastructure, Agentic AI, Agentic Coding, Claude...
Brio Commerce Inc.
Ruby on Rails (RoR), Shopify, Shopify API, Heroku, APIs, React...
Housecall Pro
Ruby on Rails (RoR), JavaScript, React, APIs, Integration
Experience
- CSS - 12 years
- JavaScript - 12 years
- HTML - 12 years
- Continuous Integration (CI) - 8 years
- Ruby on Rails (RoR) - 8 years
- React - 4 years
- React Native - 2 years
- OpenAI GPT-4 API - 1 year
Work Experience
Senior Software Engineer
2023 - 2026
Simplero ApS
- Developed a triage agent that processed more than 50 issues per day, automatically implemented fixes for at least one-third of them, and assigned the remaining issues.
- Oversaw custom development solutions for multiple clients, managing expectations, participating in client calls, and delivering results.
- Implemented software features and enhancements across a variety of projects.
- Migrated all client emails from SendGrid to AWS with a volume of 1.5 million a day.
- Implemented email infrastructure, warmup, reputation management, and sending scalability.
Technologies: Email deliverability, Email infrastructure, Agentic AI, Agentic Coding, Claude, OpenAI
RoR Developer
2023 - 2023
Brio Commerce Inc.
- Upgraded test coverage of one of the applications from 45% to 85%.
- Updated Shopify API versions across different apps.
- Implemented new features on the cart and checkout experiences, integrating with other apps and flows.
- Improved database query speed from minutes to seconds.
- Helped achieve Built for Shopify status across two apps.
- Managed and improved AWS infrastructure and fixed bottlenecks that had brought the app downtime during spikes.
Technologies: Ruby on Rails (RoR), Shopify, Shopify API, Heroku, APIs, React, Amazon Web Services (AWS)
Senior Full-stack RoR Developer
2021 - 2023
Housecall Pro
- Developed an integration with home insurance to generate jobs for service providers.
- Created new improvements to public-facing APIs used by many partners.
- Oversaw product launches and A/B testing with thousands of users using LaunchDarkly.
- Helped define features and goals for the product over quarters.
- Managed a small team of developers devoted to integrations.
- Launched a GPS tracking integration that provided customers with an Uber-like experience to see the location of service providers. This project, which I almost soloed, led to one million ARR in one year.
Technologies: Ruby on Rails (RoR), JavaScript, React, APIs, Integration
Senior Full-stack Developer
2014 - 2021
Bit Zesty
- Maintained a wide array of Ruby on Rails applications using JavaScript frameworks, performing security upgrades, version upgrades, and implementing new features on top of an existing codebase.
- Created continuous integration pipelines, including testing and deployment to many clients, using different services like CircleCI, GitlabCI, and GitHub actions.
- Audited and adapted websites and applications to pass web accessibility standards and audits by the Gov UK team.
- Worked alongside designers to launch websites and landing pages for clients in HTML, CSS, JavaScript, and sometimes WordPress.
Technologies: User Experience (UX), Accessibility, React, CSS, HTML, JavaScript, Ruby on Rails (RoR)
Senior Full-stack Developer
2012 - 2014
Duo Soluções
- Developed websites for companies that bought the company's desktop applications, integrating them via custom APIs to display relevant information on the websites.
- Implemented a newsletter system, including a Node.js service to handle the delivery of millions of emails per month.
- Developed an application to manage financial loans and credit for a local company.
- Configured a continuous integration pipeline for the newsletter system.
Technologies: Email Campaigns, Node.js, JavaScript, CSS, HTML, WordPress, Laravel, PHP
Project History
Tax Declaration for UK Residents
An Ember.js-based application to declare and calculate tax returns for UK residents. The logic was all done in the front end, which also calculated the tax return. For security reasons, the calculation was also performed on the back end and cross-checked for validation. In this project, I contributed more to the front end than the back end.
Application to Support People with Neuromuscular Diseases
https://nmd.bridgesselfmanagement.org.uk/A web application and a mobile application with information to give support to people who suffer from neuromuscular diseases.
The web application consists of a Ruby on Rails custom CMS and API, with a front end developed in React.
The mobile application in React Native consumes this API, and the application can be used offline.
Both applications were audited for accessibility and user-tested with blind people to ensure they were usable.
The web application consists of a Ruby on Rails custom CMS and API, with a front end developed in React.
The mobile application in React Native consumes this API, and the application can be used offline.
Both applications were audited for accessibility and user-tested with blind people to ensure they were usable.
Local Producers Marketplace
I am currently developing a personal project in my free time for my local community—a subscription-based marketplace for local producers to sell their products online only to people nearby and increase awareness and reach. It is a heavily modified Spree project that behaves like a true marketplace. I expect to launch it in 2021 and hope to reach more locations.
Skills
Libraries/APIs
React, Vue 2, Node.js, Stripe, Shopify API
Tools
Spree, Claude, Claude Agent SDK, Claude Code
Languages
CSS, JavaScript, HTML, PHP
Frameworks
Ruby on Rails (RoR), React Native, Ember.js, Laravel, Stimulus
Paradigms
Continuous Integration (CI), Testing
Platforms
Linux, Shopify, WordPress, Heroku, Amazon Web Services (AWS)
Other
Accessibility, User Experience (UX), Email Campaigns, Responsive Email Templates, Recurring Payments, APIs, Integration, OpenAI GPT-3 API, OpenAI GPT-4 API, Email deliverability, Email infrastructure, Agentic AI, Agentic Coding, OpenAI, AI Agents
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
Start hiring