Sílvio Contreiras
Senior Web Developer
Hi 👋🏿, I'm Sílvio
With over 9 years of experience, I'm an accomplished software developer specializing in building robust, scalable, and user-centric web applications. I'm proficient in modern frontend frameworks like React and TypeScript, coupled with strong backend development skills in NodeJS and database management (PostgreSQL, MongoDB). I thrive in Agile environments, consistently delivering impactful solutions that enhance performance, optimize user experience, and drive significant business growth. A collaborative team player and mentor, I'm eager to take on challenging roles that leverage my comprehensive technical expertise and foster continuous innovation.
Contact Me
Technical Skills
Languages/Frameworks: TypeScript, JavaScript, React, NodeJS, Next.js, Vue, Redux, Express, Fastify, Nest.js, Sass, HTML, CSS
Databases/ORMs: PostgreSQL, MongoDB
Cloud/DevOps: AWS, S3, CloudFront, CloudFormation, Docker, Git, Jenkins, DataDog, Sonar
UI Libraries & Tools: Material UI, Ant Design, Tailwind CSS, Figma, Webpack, Vite, REST API, WebSocket
Methodologies
Agile, Scrum, Kanban
Soft Skills
- Rapid learner and highly adaptable to new technologies and environments.
- Exceptional collaborator and communicator, fostering effective team dynamics.
- Dedicated and reliable professional, committed to project success.
- Proactive and eager to embrace new challenges and drive innovation.
Languages
Portuguese (Native)
English (Advanced)
Work Experience
Senior Frontend Engineer | Webmotors (Automotive Marketplace)
November 2022 - Current
- Team Collaboration: Collaborated effectively within multidisciplinary teams (QA, backend, frontend, UI/UX, Agile experts).
- Technical Leadership: Led technical interviews, mentored mid-level developers via pair programming, provided candidate feedback, and conducted rigorous code reviews to ensure best practices and maintainability.
- Feature Development & Optimization:
- Spearheaded feature development using React to enhance scalability.
- Implemented A/B tests to optimize user experience and performance.
- Maintained legacy applications, ensuring reliability and performance, and resolved bugs to uphold high software quality.
- Key Achievements:
- Rebuilt the web engine search results using Next.js, TypeScript, Storybook, and a monorepo architecture, resulting in a -22s improvement in the page loading speed index (SEO) and an additional revenue of + R$ 2MM in one month.
- Architected a new CRM Client project using module federation microfrontends, clean architecture, and AWS services (S3, Lambda Edge) while setting up CI/CD pipelines with GitHub and Jenkins.
- Technologies & Tools: HTML, CSS, JavaScript, TypeScript, React, Redux, Next.js, TanStack Query, REST API, WebSocket, AWS, NodeJS, Styled-components, Webpack, Docker, Jenkins, Git, Storybook, DataDog, Jira, Confluence.
Senior Frontend Developer | Raia Drogasil (Pharmaceutical)
March 2021 - November 2022
- Reconstructed a query terminal system, significantly improving application performance and SEO metrics.
- Technologies: JavaScript, TypeScript, React, REST API, Webpack, Git.
Software Developer | Compasso UOL (IT Services)
December 2020 - March 2021
- Enhanced site performance, leading to improved Google Lighthouse metrics.
- Resolved bugs and implemented new features.
- Technologies: JavaScript, React, Redux, Material UI, REST API, Webpack, Git.
- Client: The BodyShop Brasil
Senior Frontend Developer | Grupo Planetun (IT Services)
September 2020 - December 2020
- Developed an online car insurance application for Mapfre by rewriting a legacy system (from JSP to React).
- Technologies: JavaScript, React, Redux, Ant Design.
- Client: Mapfre, Insurance
Senior Frontend Developer | Maitha (IT Services)
January 2020 - August 2020
- Developed new features and continuous improvements for an internal system.
- Technologies: JavaScript, React, Redux Rematch.
- Client: TradeMaster, Fintech
Mid-Level Frontend Developer | Dafiti Group (E-commerce)
December 2015 - December 2019
- Led the development of responsive web applications and website redesigns to improve user experience.
- Collaborated directly with Creative, UX/UI, SEO, Marketplace, Merchandising, and Commercial teams.
- Technologies: HTML5, CSS3, JavaScript, React, Redux, Ajax, JSON, REST API.
- Project: Portal
Internship | SMPIR
2015
- Provided computer support and maintenance services.
- Configured network access permissions and set up Exchange email accounts on Outlook.
Trainee | UNASP-SP
2014
Technologies: C#, HTML 5, JavaScript, MVC, ASP.NET, SQL Server.
Education & Certifications
Education
Post-graduation in Web Engineering
2018
Senac
Analysis and Systems Development
2016
UNASP - SP
Certifications
Nanodegree in Front-End Web Development
Completed in 2018
Udacity
Bootcamp: React, NodeJS, TypeScript
Completed in 2023
Rocketseat
AWS Course
Completed in 2024
Udemy