Mário César Silva

Architected and developed high-performance, responsive, and dynamic user interfaces using React.js, Next.js, TypeScript, and JavaScript, significantly enhancing user experience.

Engineered and maintained reusable UI components, integrating seamlessly with REST and GraphQL APIs using Axios, Fetch API, and React Query for efficient data consumption.

Implemented advanced styling solutions with CSS, HTML, TailwindCSS, Styled Components, and shadcn/ui, ensuring pixel-perfect adherence to Figma prototypes.

Optimized web applications for improved SEO and performance through static/hybrid rendering with Next.js.

Managed complex routing and navigation in Single Page Applications (SPAs) using React Router, improving application fluidity.

Collaborated effectively with design and backend teams to align technical requirements and ensure successful project delivery.

Utilized Git for version control and applied Agile methodologies to streamline project development and tracking.

Applied strong graphic design skills, leveraging Adobe Illustrator, Photoshop, and InDesign for vector design, image manipulation, and layout, bridging design and development workflows.

Led the development of advanced mobile applications using React Native, Expo, and Styled-components, delivering high-quality, user-centric solutions.

Engineered "Offline First" capabilities into mobile applications, enabling seamless content access and functionality even without internet connectivity, enhancing user reliability.

Integrated interactive mapping features to provide rich geospatial information, significantly improving user experience and engagement.

Crafted engaging animations and micro-interactions, enhancing application usability and visual appeal through meticulous attention to detail.

Implemented robust push notification systems to maintain user engagement and connectivity, facilitating timely updates.

Leveraged deep linking to direct users to specific in-app content, optimizing navigation and providing a continuous, relevant user experience.

Utilized Nativebase component library to accelerate mobile development workflows and ensure a consistent, cohesive, and stylish user interface.

Designed and developed robust, scalable APIs using Node.js with frameworks such as Express.js, Fastify, and NestJS, adhering to SOLID principles, Clean Architecture, and Domain-Driven Design (DDD).

Implemented secure authentication and authorization mechanisms, including JWT and Refresh Tokens, and fortified applications against common vulnerabilities.

Managed relational and non-relational databases (SQLServer, PostgreSQL, MySQL, MongoDB), optimizing data models, crafting efficient queries, and developing stored procedures for system integration across diverse web and backend projects.

Utilized ORMs like Prisma, Drizzle, and Typeorm for efficient, type-safe database interactions and streamlined data management.

Ensured data integrity and cross-layer compliance through runtime data validation with Zod.

Developed comprehensive unit and integration tests using Vitest, significantly improving code quality and critical scenario coverage.

Orchestrated application containerization with Docker, streamlining deployment processes and creating isolated development and production environments.

Integrated critical external services, including payment APIs, cloud providers, and messaging systems (RabbitMQ, Kafka), enhancing application functionality and interoperability.

Authored detailed technical documentation for API endpoints (Swagger/OpenAPI) and contributed to architectural decisions within multidisciplinary teams.

Led and coordinated a retail team, ensuring exceptional customer service and efficient store operations.

Managed comprehensive inventory control, including merchandise reception, organization, and replenishment, reducing stockouts and excesses.

Drove sales performance through effective sales strategies, promotions, and performance metric analysis, contributing to goal attainment.

Provided personalized customer service, resolving conflicts, and fostering customer loyalty.

Oversaw cash register administration, including shift closings and value reconciliation, ensuring financial accuracy.

Ensured strict adherence to hygiene, safety, and store compliance standards, maintaining operational integrity.

Created and vectorized designs for industrial garment printing and embroidery, ensuring high quality and technical fidelity for production.

Proficiently utilized Adobe Illustrator, Photoshop, and InDesign for vector graphic development, image manipulation, and color correction.

Prepared comprehensive technical files for production, including format, color specifications, scales, and embroidery/print details.

Designed and laid out various graphic materials, such as planners, adhering strictly to brand identity guidelines.

Adapted artwork for diverse application techniques, including screen printing, sublimation, direct-to-garment (DTG), and computerized embroidery.