Jérôme Stéphan — Senior .NET/C# Developer

Based in Pucón–Villarrica (Chile) • 25+ yrs experience • High-traffic specialist • Available worldwide

.NET Core C# SQL Server High-Traffic Sites ASP.NET OpenAI

Robust websites & platforms for high traffic

I build and maintain business websites and custom platforms in .NET/C#, optimized to handle high-traffic volumes. Expert in SQL Server, scalable architecture, and performance optimization. French-born, trained in France, living in Chile for 10+ years. Available for USA, Europe and international projects.

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Strengths

.NET/C# specialist with 25+ years of experience

Expert in high-traffic websites and scalable architecture

Advanced SQL Server (design, performance, security, large volumes)

Performance optimization and Core Web Vitals

OpenAI integrations (applied AI, content generation)

Experience with robust enterprise platforms

IIS hosting + production monitoring

Services

High-traffic website development

Scalable enterprise platforms

.NET and SQL Server performance optimization

API and integrations (payments, AI, external services)

Legacy system migration and modernization

Performance and architecture auditing

Production support and maintenance

Stack & integrations

.NET Core / .NET Framework • C# • ASP.NET Core & WebForms

SQL Server (high performance, partitioning, replication)

Entity Framework • Dapper • LINQ • Optimized Stored Procedures

IIS • Windows Server • Load Balancing • Caching

REST API • Background Services • Message Queues

OpenAI API • Python • Embeddings

HTML • CSS • JavaScript • Performance optimization

About

French-born, trained in France • 10+ years in Chile

Based between Pucón & Villarrica

Available for projects in Chile, USA and Europe

Remote work + available for on-site visits

Fluent communication in Spanish, English and French

Results and deadline oriented