Backend Software Engineer

Location: Brazil
Rate, USD: Not specified
Work schedule: Full Time, Contract, Part Time,
Links
Language skills: English, Portuguese
Available for Hire: Yes

About me

I am Matheus Rennan, a passionate software engineer with a strong foundation in computer science and civil engineering. Currently, I am pursuing my Bachelor of Computer Science at the Federal University of Cariri, where I also serve as a Teaching Assistant for Introduction to Programming. My journey in technology has been fueled by my interest in artificial intelligence and software development, leading me to work on various projects that enhance user experiences and streamline processes.

As a Graduate Researcher, I focus on developing large language models (LLMs) for legal interpretation and analysis. This role has allowed me to dive deep into data collection, model training, fine-tuning, evaluation, and prompt engineering, which I find incredibly rewarding. My academic background in civil engineering has also provided me with a unique perspective on problem-solving and analytical thinking, which I apply in my software engineering roles.

In my professional experience, I have worked as a Backend Software Engineer at Avenue Code, where I migrated and refactored business rules to scalable ASP.NET Core Web APIs. I have a strong grasp of Domain-Driven Design (DDD) and have contributed to the modernization of a large-scale digital banking platform. My work emphasizes security and engineering best practices, ensuring that the solutions I develop are robust and efficient.

I have also held positions as a Full-stack Software Developer and Software Developer, where I implemented new features, maintained applications, and developed AI-powered solutions. My experience with various programming languages and frameworks, combined with my knowledge of cloud services, positions me well for tackling complex software challenges.

I am continuously seeking to expand my skill set and stay updated with the latest technologies. I believe in the power of collaboration and strive to contribute positively to any team I am a part of. I am excited about the future of technology and the role I can play in shaping it.

Professional area

Developer & Engineer

Skills

.NET Angular AWS Azure Collaboration Data Analysis Docker Flask Git HTML/CSS Java JavaScript Microservices Problem Solving Python Scrum Software Development Spring Boot SQL UI/UX

Education

Sep 2022 - Present Bachelor of Computer Science @ Federal University of Cariri (UFCA): Teaching Assistant for Introduction to Programming. Graduate Researcher since Feb 2025, focusing on the development of LLMs for legal interpretation and analysis (data collection, model training, fine-tuning, evaluation, and prompt engineering).
Aug 2018 - Aug 2022 Bachelor of Civil Engineering @ Federal University of Cariri (UFCA): Teaching Assistant for Calculus I and II.

Experience

Jan 2025 – Present Backend Software Engineer @ Avenue Code: Migrated and refactored business rules from CA Gateway to scalable ASP.NET Core Web APIs, exposed through Apigee. Applied Domain-Driven Design (DDD), CQRS, and Hexagonal Architecture to ensure clean separation of concerns and future adaptability. Wrote unit tests with xUnit and Faker (Bogus), focusing on high coverage of business-critical rules. Contributed to the modernization of a large-scale digital banking platform, emphasizing security and engineering best practices.
Aug 2024 – Jan 2025 Full-stack Software Developer @ CRM Educacional: Contributed to the evolution of the WakeMePro and WakeMeOne platforms by implementing new features and enhancing UI/UX using JavaScript, HTML, and CSS. Maintained and supported ASP.NET MVC/Core applications by fixing critical bugs and improving operational efficiency.
Jul 2023 - Aug 2024 Software Developer @ Brisa Sociedade para o Desenvolvimento Tecnologia da Informação: Created Web APIs in .NET Core with PostgreSQL via Entity Framework Core, ensuring high performance and maintainability with xUnit tests. Designed an AWS Lambda microservice for OCR document validation (Amazon Textract), integrating with the OpenAI API for data contextualization. Developed an AI-powered virtual assistant using Django and Python libraries (Langchain, LlamaIndex), leveraging LLMs using RAG for advanced interactions.
Jan 2023 - Aug 2023 Artificial Intelligence Intern @ n.0 tecnologia: Worked on object detection with YOLO and RCNN to identify and classify equine behaviors, using deep neural networks (DNNs) and OpenCV. Ensured reliable user outputs by analyzing neural network results and providing robust classifications.