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I'm Guilherme Andre, a software developer with 6+ years of experience stabilizing APIs, optimizing SQL, and maintaining production systems. I specialize in .NET/.NET Core, ASP.NET Web API, SQL Server, Angular, Blazor, and Azure DevOps, delivering robust, scalable backend services for high-traffic platforms. I value clear communication and thrive in remote collaborations across EU and APAC time zones. I have freelance experience with clients in Asia and am currently studying Japanese in Japan, while pursuing IBM Data Science and a Computer Science degree with University of the People to keep skills sharp.…I'm Guilherme Andre, a software developer with 6+ years of experience stabilizing APIs, optimizing SQL, and maintaining production systems. I specialize in .NET/.NET Core, ASP.NET Web API, SQL Server, Angular, Blazor, and Azure DevOps, delivering robust, scalable backend services for high-traffic platforms. I value clear communication and thrive in remote collaborations across EU and APAC time zones. I have freelance experience with clients in Asia and am currently studying Japanese in Japan, while pursuing IBM Data Science and a Computer Science degree with University of the People to keep skills sharp.

Guilherme Andre

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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I'm Guilherme Andre, a software developer with 6+ years of experience stabilizing APIs, optimizing SQL, and maintaining production systems. I specialize in .NET/.NET Core, ASP.NET Web API, SQL Server, Angular, Blazor, and Azure DevOps, delivering robust, scalable backend services for high-traffic platforms. I value clear communication and thrive in remote collaborations across EU and APAC time zones. I have freelance experience with clients in Asia and am currently studying Japanese in Japan, while pursuing IBM Data Science and a Computer Science degree with University of the People to keep skills sharp.…I'm Guilherme Andre, a software developer with 6+ years of experience stabilizing APIs, optimizing SQL, and maintaining production systems. I specialize in .NET/.NET Core, ASP.NET Web API, SQL Server, Angular, Blazor, and Azure DevOps, delivering robust, scalable backend services for high-traffic platforms. I value clear communication and thrive in remote collaborations across EU and APAC time zones. I have freelance experience with clients in Asia and am currently studying Japanese in Japan, while pursuing IBM Data Science and a Computer Science degree with University of the People to keep skills sharp.

Available to hire

I’m Guilherme Andre, a software developer with 6+ years of experience stabilizing APIs, optimizing SQL, and maintaining production systems. I specialize in .NET/.NET Core, ASP.NET Web API, SQL Server, Angular, Blazor, and Azure DevOps, delivering robust, scalable backend services for high-traffic platforms.

I value clear communication and thrive in remote collaborations across EU and APAC time zones. I have freelance experience with clients in Asia and am currently studying Japanese in Japan, while pursuing IBM Data Science and a Computer Science degree with University of the People to keep skills sharp.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

Portuguese

Fluent

English

Fluent

Japanese

Intermediate

Work Experience

Software Developer at NOS Telecommunications

March 1, 2025 - November 15, 2025

Stabilised key REST endpoints, reducing timeouts and 5xx errors on high-traffic services. Optimised SQL performance (indexes and stored procedures) for operational and reporting queries. Added focused unit tests and tightened code review practices to cut regressions in production.

Independent Software Developer / Japanese Language Student at Self-employed / Nippon Academy (Locale: Japan)

June 1, 2024 - June 1, 2024

Lived in Japan and studied Japanese while continuing software development work. Delivered freelance projects for clients in Malaysia and Thailand (Angular, .NET 6, SQL Server, MySQL). Built and maintained side projects including a campaign management system (NET 8, Blazor, MySQL), an MVC sales store, and a Node.js book notes application.

Software Developer at QuickOps

May 1, 2022 - May 1, 2022

Maintained and extended a laboratory management system using .NET Core and Azure DevOps. Data Access / ORM: Entity Framework, Dapper. DevOps & Tools: Azure DevOps, Git, CI/CD pipelines, Docker, xUnit, SSIS, JIRA, Confluence. Practices: SOLID, Dependency Injection, Unit Testing, Agile/SCRUM.

Developer at Affinity

December 1, 2021 - December 1, 2021

Debugged and optimised APIs and SSIS flows, ensuring stable integrations between systems. Implemented new features while keeping compatibility with existing SSIS packages. Supported QA and code reviews in an Agile environment.

Full Stack Developer at Grupo Total Media

May 1, 2021 - May 1, 2021

Built a logistics management system from scratch using .NET Core, SQL Server, and Angular. Implemented GPS tracking and delivery scheduling via REST APIs. Added unit tests and worked via Azure DevOps Boards for task tracking and collaboration.

Developer at BOLD

December 1, 2019 - December 1, 2019

Improved usability and functionality of an electronic condiment exchange platform (.NET Core, Oracle, SOAP, MVC). Fixed critical API bugs and helped stabilise production. Assisted with data migration to integrate with new systems.

Developer at Growin

April 1, 2019 - April 1, 2019

Developed and deployed features with .NET Core/C#, using Docker and unit testing. Worked in an Agile SCRUM team, contributing to feature design and code reviews.

Developer at Everis

October 1, 2018 - October 1, 2018

Reverse engineered and optimised legacy C# and VB applications for better maintainability. Updated and fixed SQL Server and Oracle stored procedures to improve data reliability. Worked in Agile teams using JIRA and regular code reviews.