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Ruben LRRL
Open to opportunities

Ruben LR

@rubenlr

I’m a senior .NET backend developer focused on building reliable enterprise APIs with clean architecture.

Spain
Message

What I'm looking for

I’m looking to build and scale .NET backend systems in enterprise environments, using Clean Architecture, testing (TDD), and modern cloud practices—owning APIs end to end while collaborating closely with product and engineering.

I’m a Senior .NET Backend Developer, maintaining and evolving a cross-platform agent in .NET Framework and .NET Core, deployed on Windows, Linux, and macOS. In an enterprise security environment, I’m responsible for a web application and three console applications, applying Clean Architecture principles to keep the codebase high-quality and maintainable.

Previously, I built and maintained backend APIs for a real estate P2P lending platform, helping drive a React migration by porting legacy components into reusable modules. Earlier, I led a 4-person team to port a mobile app from Java/Kotlin to React Native, and I also acted as project manager for an enterprise area involving payment gateway integrations and sales analytics on an MVC + Elasticsearch + REST API platform—while delivering products like a custom CRM and full e-commerce sites using ASP.NET, C#, SQL Server/MySQL, and Elasticsearch.

Experience

Work history, roles, and key accomplishments

FI

.NET Core Developer

FinLoop

Aug 2022 - Aug 2023 (1 year)

Built and maintained backend APIs for a real estate P2P lending platform connecting borrowers and lenders. Contributed to a React migration by porting legacy components into reusable modules across the platform.

Sage logoSA

.NET Core Developer

Sage

Jul 2021 - Aug 2022 (1 year 1 month)

Designed and developed a messaging API used across multiple Sage applications. Worked with cloud and database services to support the API's delivery and integration requirements.

RA

Team Lead & Senior Developer

Red Arbor

Feb 2014 - Jul 2021 (7 years 5 months)

Led a 4-person team porting the Computrabajo mobile app from Java/Kotlin to React Native and coordinated with design, product, and the CTO. Managed the Computrabajo enterprise area, including analysis, task management, payment gateway integrations, and sales analytics on an MVC + Elasticsearch + REST API platform.

Education

Degrees, certifications, and relevant coursework

IG

Institut Gesem

Técnico en Informática Empresarial, Informática Empresarial

Completed a Técnico en Informática Empresarial program at Institut Gesem.

JT

Jesús María Claudina Thevenet

Educación Secundaria Obligatoria (ESO), Educación Secundaria

Completed ESO (Educación Secundaria Obligatoria) at Jesús María Claudina Thevenet.

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