Open to opportunities

Tomas Esteban

@tomasesteban

Backend .NET developer at Valkimia, maintaining a production application and resolving incidents to keep the system stable and available.

Argentina

Message

At Valkimia, I support and maintain a backend application developed in .NET. I investigate and resolve production incidents, and analyze logs and application performance to identify failures proactively.

Previously at Valkimia, I developed reusable UI components for a home banking platform, reducing UI duplication by 40% across three projects and improving load times by 15%. At Artekium, I integrated AngularJS with Java Spring APIs and developed accounting and invoicing workflows.

Experience

Work history, roles, and key accomplishments

Current

Backend .NET developer

Current

Valkimia

Jan 2026 - Present (9 months)

Provided technical support and maintenance for a .NET backend application. Investigated and resolved production incidents, ensuring system stability and availability.

.NET Backend Development Incident Management Log Analysis Performance Monitoring

Fullstack Angular + .NET developer

Valkimia

Aug 2025 - Jan 2026 (5 months)

Developed interfaces for an internal tool using Angular 16 and .NET 7. Created reusable components and integrated REST APIs and microservices.

Angular .NET REST APIs Microservices Reusable Components

Frontend developer

Valkimia

Sep 2024 - Aug 2025 (11 months)

Developed and maintained UI components for a home banking platform, meeting WCAG accessibility standards. Reduced UI duplication by 40% and improved load times by 15%.

Angular UI Development Accessibility (WCAG)Performance Optimization Reusable Components

Fullstack AngularJS + Java Spring developer

Artekium

Nov 2021 - Aug 2024 (2 years 9 months)

Integrated AngularJS frontend with Java Spring APIs, optimizing data synchronization and reducing response times by 20%. Implemented new features for a high-impact banking platform used by over 10,000 monthly users.

AngularJS Spring Framework REST APIs Banking Data Synchronization

Fullstack GeneXus developer

Cognitum-IT

Mar 2021 - Nov 2021 (8 months)

Worked with multidisciplinary teams to deliver improvements on time and reduce backlog by 15%. Developed and maintained internal modules using GeneXus, improving stability for over 200 daily users.

Genexus Fullstack Development Backlog Management Automation