Freelancer profile translated to English.

Description

I am Toni, a developer with over 4 years of experience building enterprise web applications in real-world environments: SEAT R&D, Cuatrecasas, and T-Systems. I have worked from within large companies and understand their processes, bottlenecks, and what a solution needs to truly fit into a corporate environment.

I specialize in two specific areas. First, backend development with .NET and REST APIs, building and maintaining services, integrating with external systems, and managing PostgreSQL and SQL Server databases in production environments. Second, enterprise solutions with OutSystems, from developing new applications to migrating legacy systems to low-code platforms, including integration with corporate REST and SOAP APIs. Working in that environment taught me to make technical decisions where mistakes have real costs, something I directly apply to any .NET or React project.

I have also worked with CI/CD pipelines, GitHub Actions, and Kubernetes environments, allowing me to deliver autonomously without relying on an infrastructure team.

What sets me apart is that I don't come to learn. I come to build something that works from day one, with the context of having worked on real enterprise projects where mistakes have costs.

If you have an automation, system integration, or internal application development project, tell me the problem and I'll tell you if I can help.

Languages

Spanish
Native or bilingual
Catalan
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

T-Systems Iberia
Software Engineer
TRAVEL AND TOURISM
October 2025 - Today (10 months)
Barcelona, Spain
Project: Segittur – (.NET)

• Development and maintenance of .NET REST APIs for user and sandbox management.
• Implementation of endpoints for exposing KPIs and operational metrics.
• Integration with external APIs (e.g., Jira) for data extraction.
• Data management on PostgreSQL in various environments.
• Monitoring deployments and reviewing logs in Kubernetes environments using ArgoCD.
• Collaboration in CI/CD pipelines using GitHub Actions and version control with GitHub.
• Evolutionary support and incident resolution in coordination with the architect.

Technologies: .NET | ASP.NET Core | REST APIs | PostgreSQL | GitHub | GitHub Actions | ArgoCD | CI/CD | API Integration

Project: MC Mutual – OutSystems

• Development of a common module in OutSystems for integration with the client's document management API.
• Task estimation and participation in sprint planning.
• Technical improvement proposals in coordination with the team and architects.

Stack: OutSystems
.NET PostgreSQL ASP.NET Core CI/CD Management API
ALTEN Spain
Software Developer
LEGAL
March 2024 - October 2025 (1 year and 7 months)
Barcelona, Spain
I was part of the development team at Cuatrecasas, creating and maintaining internal web applications that optimize processes and resources within the organization. My work ranged from modernizing/updating existing solutions in other environments to the OutSystems platform, to developing new tools that facilitate employees' daily work and improve operational efficiency.

Knowledge and highlighted functions:

Complete development of internal web applications, including database design and development up to implementation.

Creation and optimization of SQL Server databases to ensure performance and scalability.

Migration of legacy applications developed in .NET to the OutSystems platform, analyzing their business logic and adapting their structure to the new environment.

Integration and consumption of APIs developed in .NET.

Internal training and development in .NET and service architecture, expanding knowledge in backend development and design principles applicable to enterprise environments.
.NET Web Development REST API SQL Server Outsystems
SEAT, S.A.
Software Developer
AUTOMOBILE
February 2022 - March 2024 (2 years and 1 month)
Martorell, CT, Spain
I was part of Data Driven R&D, a project involving custom-made applications and software that integrates all the data generated in the R&D area to work with it in real-time, thanks to the online information generated.

Knowledge acquired:

• Development and maintenance of applications for different processes in SEAT S.A.'s R&D department.
• Design of optimized, updated, and efficient databases.
• Application of Agile methodology for project development.
• Participation in concept meetings with design, product, and UX to align specifications.
Outsystems SQL Web Development Web Maintenance Problem Solving