c:\Users\sigfrid.couto.fernandez>

Building scalable enterprise solutions with .NET & Angular

Software engineer and technical lead specializing in modern web applications, legacy system modernization, and cross-border EU projects.

15+
Years Experience
5
Languages
Sigfrid Couto
// Services

What I offer

Specialized in .NET, Angular, and SQL databases — 15+ years of hands-on delivery across logistics, real estate financing, and media rights sectors.

01

Full-Stack Development

End-to-end development of modern web applications using Angular for reactive frontends and .NET Core for robust backends. From database design to API development and UI implementation.

AngularTypeScriptC#.NET Core
02

Legacy System Modernization

Migrate outdated WinForms and desktop applications to modern web platforms. Hands-on experience at netgo software GmbH modernizing logistics systems from WinForms to Web API + Angular.

MigrationRefactoringWeb API
03

API Development & Integration

Design and implement RESTful APIs with ASP.NET Web API, OData, and Entity Framework. Integration of third-party services and data exchange interfaces (XML, JSON, DDEX).

REST APIODataEF Core
04

Database Architecture

Database design, optimization, and migration across SQL Server, Oracle, and PostgreSQL. Data cleansing, ETL processes, and integration jobs with tools like Talend.

SQL ServerOraclePostgreSQL
05

Agile Team Collaboration

Experienced contributor in cross-functional agile teams of ~5 using Scrum and Kanban. Active in code reviews, pair programming, and knowledge-sharing sessions that keep codebases healthy and teams aligned.

ScrumKanbanAgile
06

Multilingual Technical Communication

Bridge language barriers in international projects. Fluent technical communication in Spanish, Catalan, German (C2), English (B2), and French (B1).

ES/CADEENFR
// Experience

Career highlights

Apr 2023 – Present

Freelance Developer

Self-employed • France

Full-stack development of custom applications with Angular (TypeScript) frontend and .NET backend. Building REST APIs, invoice management systems, and cross-border EU transaction platforms.

Aug 2017 – Mar 2023

Software Developer

netgo software GmbH • Berlin

Full-stack .NET and C# development with focus on backend. Developed a real estate financing platform in Angular and C# .NET Framework 4.6.2 – .NET 6. Modernized logistics applications from WinForms to web with Web API and Angular in agile teams of ~5 people.

Dec 2012 – Aug 2017

Software Developer & Lead Engineer

GVL • Berlin

Developed WPF frontend for customer data management. Implemented XML-based interfaces for German TV stations. Lead Engineer and stakeholder for VRDB project. Data integration with Talend, database design and migration (SQL Server, Oracle).

Mar 2010 – Nov 2012

Software Developer

Jonas & Redmann Automationstechnik • Berlin

Machine visualization framework development with Delphi. PLC systems integration (Beckhoff Twincat). Optical measurement system interface development with C# .NET.

// Education

Academic background

Computer Science Engineering

UPC · Barcelona
// Tech Stack

Technologies & Tools

Frontend
AngularTypeScriptJavaScriptRxJSNgRxReduxAngular MaterialBootstrap
Backend
C#.NET Core.NET FrameworkASP.NET MVCWeb APIWCFEntity FrameworkLINQ
Databases
SQL ServerOraclePostgreSQLMongoDBT-SQLPL/SQL
Tools & Methods
GitTFSVisual StudioVS CodeScrumKanbanJIRAConfluence
Cloud
AzureDocker
Testing
MSTestNUnitMoqKarmaJasmine
Other
WPFWinFormsTalendXML/XSDJSONODataREST API