Paulo Degering Rosa Junior

Senior Software Engineer with over 15 years of experience designing, developing, integrating, and maintaining enterprise software systems across multiple technology stacks. Strong background in business-critical applications, systems integration, backend development, relational databases, REST APIs, legacy modernization, and end-to-end solution delivery. Professional experience with C#/.NET since 2014, including ASP.NET MVC/Core, REST APIs, desktop applications, IoT platforms, SQL Server, and Vue.js.

Earlier experience includes enterprise development with Delphi, while recent work has focused primarily on TOTVS Protheus/ADVPL, ERP integration, Oracle/SQL Server, and enterprise APIs. Hands-on throughout the software development lifecycle, from requirements analysis and solution design to implementation, deployment, production support, and continuous improvement. Uses Generative AI, coding agents, LLMs, and Python automation as engineering tools to accelerate delivery, documentation, prototyping, and technical problem-solving.

Software Engineer — ERP Integration & Customization - TOTVS Protheus - Remote

(2023-10)

• Develop ADVPL customizations for core TOTVS Protheus modules (Purchasing, Sales, Inventory and Finance), supporting mission-critical business processes in production environments.
• Integrate Protheus with external systems through REST and SOAP APIs, implementing validation mechanisms, error handling, and execution safeguards to improve reliability and reduce operational issues.
• Optimize complex Oracle and SQL Server queries for reports and batch processes, significantly improving execution time for recurring operations.
• Work closely with business stakeholders to gather requirements, translate business rules into technical specifications, and deliver robust, maintainable solutions.

Senior Software Engineer — Full Stack & Systems Integration - Freelance - Remote

(2017-09)

Design and develop custom enterprise software solutions for clients across different industries, including web applications, desktop software, systems integration, APIs, and IoT platforms. Responsible for solution design, architecture, implementation, deployment, production support, and long-term evolution.

• Design and develop backend applications using C# and .NET, including ASP.NET Core REST APIs, integration services, background processing, and business-critical data processing.
• Develop responsive web frontends using Vue.js for enterprise operational and monitoring systems.
• Design and implement IoT platforms for real-time water and energy monitoring, integrating electronic devices through MQTT, processing continuous telemetry streams, and building operational dashboards.
• Develop desktop applications that communicate with industrial and automotive hardware via USB, processing data collected directly from electronic devices.
• Design and optimize relational databases across SQL Server, Oracle, MySQL, and SQLite, including data modeling, Stored Procedures, query optimization, indexing, and performance tuning.
• Integrate modern and legacy enterprise systems using REST APIs, SOAP services, XML, and JSON.
• Work across requirements gathering, solution design, implementation, deployment, production support, and continuous improvement.
• Use Generative AI, coding agents, LLMs, and Python automation to support implementation, documentation, prototyping, and engineering workflows.

Software Engineer - GreenD Software Factory - Sorocaba, Brazil

(2014-10 - 2017-07)

• Developed enterprise web applications using C#, ASP.NET MVC, and SQL Server for e-commerce and healthcare clients.
• Contributed to solution design, implementation, maintenance, and evolution of business-critical enterprise applications.
• Collaborated within a six-developer team through code reviews, technical discussions, and coding standards definition.

Software Engineer — Enterprise Systems - Sistemas Seguros - Sorocaba, Brazil

(2012-04 - 2013-08)

• Analyzed business requirements and designed and implemented enhancements for the company's flagship enterprise application built with Delphi and SQL Server.
• Optimized text- and XML-based data import routines, improving processing efficiency and reliability.
• Proposed technical and process improvements that were adopted by the development team.

Software Developer — Abril Publishing Account - Metrics Information Systems - São Paulo, Brazil

(2010-03 - 2012-07)

• Supported Abril Publishing across the software lifecycle, from requirements analysis and implementation to documentation, delivery, and technical support.
• Worked directly with the client to gather requirements, validate solutions, and provide technical assistance.
• Developed Delphi applications using the company's internal framework, applying object-oriented programming principles and advanced data structures for publishing-production systems.

Bachelor's Degree - Information Systems - University of São Paulo (USP) (2006 - 2011)