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Fedor
Smirnov

Average Review
0.00
Reputation
17
Finished gigs
0
Finished jobs
0
Website
Not specified
Country
Not specified
Specialization
.net
Hourly rate
$40/hr
Preferred payment options
Ethereum
USDT
USDC
About me
Senior C# / .NET Backend Developer with 16+ years of experience architecting and delivering high-load enterprise portals, financial systems, and robust integration services. My core technical stack includes .NET Core/.NET 6/7/8, C#, ASP.NET Core Web API, MS SQL Server, PostgreSQL, Entity Framework Core, and RabbitMQ. I specialize in designing scalable backend architectures (SLA 99.9%), writing high-performance asynchronous services, optimizing complex database queries, and implementing secure authentication pipelines (OAuth2/JWT). Beyond enterprise development, I build and maintain open-source solutions (such as custom auth systems and task-tracking tools). I follow Clean Architecture, SOLID principles, and clean code practices. Currently open to remote contract opportunities and direct project collaborations requiring solid backend engineering and secure API integrations.

Work experience

Information Technology, System Integration & Software Consultancy
April 2023 – Current time
Job title
Senior C# / .NET Developer (Freelance / Contract)
Work experience & achievements
Architected, developed, and optimized enterprise software, web services, and financial-analytical modules under direct commercial and governmental contracts. Maintained and enhanced high-load web portals (handling tier-3 support and comprehensive code reviews). Designed and implemented a robust disaster recovery plan (DRP) and backup strategy, guaranteeing uninterrupted 24/7 operations. Developed new functional modules using C# and ASP.NET Core to automate technological, financial, and document-management workflows. Implemented seamless integrations between enterprise systems and third-party services via REST and SOAP APIs on the .NET platform. Conducted deep performance tuning of MS SQL Server and PostgreSQL databases, writing high-performance queries that accelerated critical feature response times by 1.5–2x. Integrated modern version control and automated deployment pipelines (Git, CI/CD), significantly increasing application stability.
Large-Scale Retail & E-Commerce Solutions
October 2023 – February 2025
Job title
C# / .NET Backend Developer
Work experience & achievements
Developed and supported core enterprise web applications utilizing C# and .NET. Upgraded internal financial system integration layers, substantially enhancing data processing performance. Optimized MS SQL Server database schemas and authored high-performance SQL queries for financial accounting modules. Deployed automated reporting and data export solutions to streamline auditing and financial control.
Industrial Engineering, Enterprise Infrastructure & IT
May 2016 – March 2023
Job title
Senior .NET / SharePoint Software Engineer
Work experience & achievements
Designed and maintained enterprise-grade applications, portals, and financial modules on .NET and collaboration platforms. Introduced comprehensive document management and financial operations reporting systems, reducing operational workload for accounting departments. Automated payment request processing and financial settlement workflows. Optimized database architectures, refactoring stored procedures and indexes to dramatically boost financial data processing speeds. Ensured secure and reliable integration with external partner services via Web API (REST / SOAP).
Logistics, Supply Chain & IT Consulting
May 2014 – May 2016
Job title
Core .NET / Integration Developer
Work experience & achievements
Integrated internal corporate services with external vendor and partner APIs via Web API, REST, and SOAP. Developed enterprise web portals and automated complex business workflows using modern workflow engines. Built management reporting automation systems and operational metric visualization layers on MS SQL Server.
Financial Sector & Banking Information Systems
September 2008 – October 2013
Job title
IT Department Lead / Systems Administrator
Work experience & achievements
Directed the development and maintenance of high-load server applications on .NET. Configured, maintained, and optimized MS SQL Server databases and backend infrastructure. Implemented automated monitoring and reporting solutions, sharply reducing production incidents and downtime.

Education

M.S. & Postgraduate Studies in Biological / Life Sciences & Applied Technologies
Graduation year: 1999
Level of study
PhD
Major / Field of study
Physiology