Jeferson Fernandes — Mid-level Full Stack Developer

Process automation and maintenance of critical business systems, focused on replacing manual work with bots and automated integrations.

Built RPA bots in C# and .NET Worker Services to collect and process data automatically, eliminating recurring manual tasks.

Implemented web crawling and scraping solutions to integrate external systems, automating flows that were previously 100% manual.

Maintained and evolved a legacy Delphi/Object Pascal ERP in production, focusing on stability, critical fixes and business rule changes.

Supported critical business processes, contributing directly to the operational reliability of the company's systems.

Public cultural mapping project focused on accessibility and digital inclusion for cultural organizations in the state.

Built the frontend in React and Next.js with a focus on accessibility and responsiveness, following the project's digital inclusion guidelines.

Created REST APIs in C# .NET to manage locations, integrated directly with PostgreSQL for geographic queries.

Implemented an interactive map with Leaflet to display the mapped cultural organizations.

Helped bring more than 100 cultural organizations online, widening public access to cultural information in the state.

Integrated forms and automated data collection flows, making it easier for the government team to keep the platform up to date.

Responsible for the architecture and development of a multi-tenant operations management system, from scratch to deploy.

Built a shift and attendance management system with a multi-tenant architecture, ensuring data isolation and scalability across clients sharing the same database.

Implemented WhatsApp and phone call automations to confirm shifts, reducing manual work for the clients' HR teams.

Designed a full audit trail of operations, making data more reliable in disputes or operational errors.

Modeled a complex relational database in PostgreSQL with Drizzle ORM, with advanced relationships and fine-grained per-tenant permissions.

Built integrations and automations with N8N, removing manual steps from recurring administrative processes.

End-to-end work on several projects at once, most notably as technical lead of a multi-currency financial platform (BRL/USD).

Led the full development of the platform — architecture, backend, frontend and admin panel — from requirements to production.

Structured the backend with Clean Architecture, separating domain, application and infrastructure layers for easier maintenance and testing.

Implemented JWT authentication and integrations with real-time currency conversion APIs, keeping BRL and USD balances consistent.

Built admin dashboards that automate the withdrawal flow, reducing the operations team's manual work when reviewing transactions.

For other clients, built automations with WhatsApp, webhooks and chatbots, and worked directly with them to define business rules and technical solutions.

Built a system for managing and automatically generating custom contracts in 3 months, using React, Next.js and .NET.

Improved and optimized existing features, making the contract generation workflow more efficient.

Hands-on program covering programming, databases, software engineering, networking and information security. Additional certifications: JavaScript and TypeScript from basic to advanced (Udemy, 2025) and Entity Framework Core 8 + Minimal API (Udemy, 2023).