Raul Fernandez - PortfolioApp

About Me

I'm a results-driven Senior .NET Developer with a passion for solving complex problems and building reliable, high-performance systems. At just 22 years old, I’ve already led initiatives that dramatically improved core systems at scale — including reducing critical integration failures by 95% and optimizing API performance by over 98%, going from 15 seconds to 200ms per request.

I specialize in .NET Core and .NET Framework solutions, especially around enterprise integrations — connecting WMS systems like Manhattan SCALE, ERP platforms, and third-party APIs through worker services, backend APIs, and automation workflows. I’ve also taken ownership of messy legacy code, transforming it into clean, maintainable, and well-logged systems.

I'm always looking to push boundaries, deliver business value, and work on impactful projects. Whether it's improving performance, increasing reliability, or accelerating development workflows, I bring both technical skill and the hunger to grow fast.

🚀 Currently open to remote opportunities worldwide — especially roles that challenge me, offer mentorship, and allow me to contribute to high-impact teams.

Portfolio

Experience

Senior software developer

Guatemala - remote

Grupo Distelsa

June 2024 – Present

Led debugging and optimization efforts in critical .NET Core and .NET Framework integrations between Manhattan SCALE WMS, ERP systems, and third-party platforms.
Reduced critical integration failures from 4+ per week to 1 in the last 5 months, stabilizing daily operations across warehouse and business systems.
Identified and optimized high-latency endpoints, reducing response time from 10–15 seconds to under 200ms, improving performance by up to 98%.
Refactored legacy systems for better maintainability, added structured logging, and improved code quality and observability across multiple services.
Ensured seamless data flows using .NET Worker Services, APIs, and internal tools, contributing to warehouse automation and business process reliability.

Software Developer

Guatemala - remote

Widook Consulting

September 2023 – June 2024

Worked extensively with .NET Framework, Oracle databases, and DevExpress UI components to enhance system functionality, improve performance, and support business operations.
Collaborated closely with client stakeholders to troubleshoot issues, implement new features, and optimize workflows across retail and warehouse environments.
Adapted quickly to client requirements and legacy codebases to provide reliable, scalable software solutions in a fast-paced environment.

Teaching Assistant – Introduction to Programming & Data Structures (CS-115, CS-150, CS-151)

Guatemala - remote

Universidad Galileo

January 2022 – November 2024

Provided hands-on support to students during lab sessions, helping them understand programming concepts and troubleshoot code effectively.
Conducted extra review classes and study sessions to reinforce learning and prepare students for exams.
Stepped in as a substitute instructor on multiple occasions, delivering lectures and managing classroom activities to ensure continuity of instruction.