Senior full-stack .NET/C# engineer with 8+ years of experience building and modernizing web applications, ASP.NET Core REST APIs, Angular and React front ends, and SQL Server/PostgreSQL systems. I also build RAG solutions with .NET and ASP.NET Core using Microsoft Semantic Kernel, LLM and embedding integration, vector databases, and document ingestion, chunking, indexing and update pipelines for custom knowledge-base chatbots and semantic search. Experienced with Azure, AWS, Git and CI/CD. I focus on reliable architecture, clear communication, debugging, integrations and maintainable delivery. English: Fluent. Available up to 20 hours per week outside my full-time role. Portfolio: _Website not available. Sign in: https://www.twine.net/signup_ | GitHub: _Website not available. Sign in: https://www.twine.net/signup_…

Leonardo Apollonio

Senior full-stack .NET/C# engineer with 8+ years of experience building and modernizing web applications, ASP.NET Core REST APIs, Angular and React front ends, and SQL Server/PostgreSQL systems. I also build RAG solutions with .NET and ASP.NET Core using Microsoft Semantic Kernel, LLM and embedding integration, vector databases, and document ingestion, chunking, indexing and update pipelines for custom knowledge-base chatbots and semantic search. Experienced with Azure, AWS, Git and CI/CD. I focus on reliable architecture, clear communication, debugging, integrations and maintainable delivery. English: Fluent. Available up to 20 hours per week outside my full-time role. Portfolio: _Website not available. Sign in: https://www.twine.net/signup_ | GitHub: _Website not available. Sign in: https://www.twine.net/signup_…

Available to hire

Senior full-stack .NET/C# engineer with 8+ years of experience building and modernizing web applications, ASP.NET Core REST APIs, Angular and React front ends, and SQL Server/PostgreSQL systems. I also build RAG solutions with .NET and ASP.NET Core using Microsoft Semantic Kernel, LLM and embedding integration, vector databases, and document ingestion, chunking, indexing and update pipelines for custom knowledge-base chatbots and semantic search. Experienced with Azure, AWS, Git and CI/CD. I focus on reliable architecture, clear communication, debugging, integrations and maintainable delivery. English: Fluent. Available up to 20 hours per week outside my full-time role. Portfolio: Website not available. Sign in: https://www.twine.net/signup | GitHub: Website not available. Sign in: https://www.twine.net/signup

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Skills

Experience Level

.NET
Expert
API
Expert
ASP.NET
Expert
C#
Expert
Microsoft SQL
Expert
AWS
Intermediate
Azure
Intermediate
PostgreSQL
Intermediate
React JS
Intermediate
TypeScript
Intermediate

Language

Work Experience

Full-Stack .NET Developer at International energy company (name withheld)
September 2, 2022 - Present
Develop and maintain internal business applications with .NET and ASP.NET Core. Build RAG workflows with Microsoft Semantic Kernel, LLM and embedding integration, vector search, and document ingestion, chunking, indexing and updates. Develop knowledge-base chatbots and semantic search. Employer and implementation details remain confidential. Employment dates are recorded to month precision: September 2022 to present; the exact start day is not specified.

Education

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Qualifications

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Industry Experience

Software & Internet, Energy & Utilities, Transportation & Logistics, Financial Services, Media & Entertainment
    Real-Time Maritime Tracking Platform

    Contributed as a Full-Stack .NET Engineer to a platform combining real-time vessel tracking with port and terminal information. Developed new modules and resolved defects across the .NET application and data layer to support reliable maritime operations.

    Portfolio: https://www.twine.net/signin

    RAG Knowledge-Base Applications with .NET

    Designed and built RAG workflows with .NET and ASP.NET Core using Microsoft Semantic Kernel. Integrated LLMs, embeddings and vector search with document ingestion, chunking, indexing and update pipelines for custom knowledge-base chatbots and semantic search. Work was delivered for private business systems; client and implementation details remain confidential.

    Portfolio: https://www.twine.net/signin
    GitHub: https://www.twine.net/signin