RC

Roman Cheremnov

Available to hire

I’m Roman Cheremnov, a senior .NET/C# software engineer and lead developer with 14 years of experience building web, desktop, and mobile products for international clients.

About

I’m Roman Cheremnov, a senior .NET/C# software engineer and lead developer with 14 years of experience building web, desktop, and mobile products for international clients. I’ve led large-scale engineering efforts such as migrating an enterprise telecom knowledge base from a monolith to microservices, delivering much faster search and improved relevance using semantic search and LLM embeddings. I’m especially focused on search quality, Elasticsearch/OpenSearch, REST APIs, and LLM-based retrieval that makes applications truly useful to end users.

Beyond client work, I build and ship my own AI products end to end. I created Just247Pipes, a pipeline and RAG engine where users assemble AI pipelines and connect external LLM providers using their own credentials, with sharing via URL so every recipient gets an independent copy. I also maintain the AIHelpers engineering blog and showcase agent pipelines, combining strong engineering with promotion through practical content, open-source tools, and hands-on evaluation to help other developers build reliable local RAG and search systems.

  • 10 years' experience
  • Joined November 2026

Languages

  • EnglishIntermediate
  • GermanBeginner

Industry experience

  • Software & Internet
  • Telecommunications

More experts

Work experience

Lead Software Developer · JSC MTSOct 2022 – Present · 4 yrs 2 mos

Led the migration of an enterprise knowledge base for a telecom operator (about 80 million customers) from a monolith to microservices. Improved search performance by 20x and implemented personalized search. Researched and integrated LLM embedding models to enable semantic search, increasing search relevance by 25%. Took technical ownership of architecture decisions and led a development team using Agile practices, including planning and code review. Stack included C#, .NET, Elasticsearch/OpenSearch, Kafka, Docker, PostgreSQL, and ClickHouse.

Software Developer (.NET/C#) · Freelance (Worldwide)Nov 2016 – Oct 2022 · 6 yrs

Delivered web, desktop, and mobile applications for international clients from concept to production. Built RESTful APIs using ASP.NET MVC for Ionic/Angular frontends and created public APIs for client applications. Integrated PayPal and Stripe payments, maintained and extended ASP.NET MVC products, and supported releases of Android and iOS apps. Improved team efficiency by 15% through systematic testing, bug fixing, and process documentation. Worked across C#, .NET, ASP.NET MVC, Angular/Ionic, and related tooling.

Software Developer (.NET/C#) · FreelanceNov 2016 – Oct 2022 · 6 yrs

Delivered web, desktop, and mobile solutions for international clients from concept to production. Built RESTful APIs using ASP.NET MVC for Ionic/Angular applications and provided public APIs for client integrations. Integrated PayPal and Stripe payments into ASP.NET MVC systems, maintained and extended existing ASP.NET MVC products, and built/released Android and iOS apps. Improved team efficiency by about 15% through systematic testing, bug fixing, and process documentation.

Education

Master's degree in Applied Informatics · Russian State University for the Humanities2003 – 2008
Master’s degree in Applied Informatics · Russian State University for the Humanities2003 – 2008

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