Senior .NET backend engineer (10+ yrs) looking for a team building real products: scalable APIs, microservices, SQL Server/Redis, Azure. Interested in AI/LLM-powered systems — I co-founded an LLM gateway in .NET 8. Based in Israel (Europe time zone), open to remote, hybrid or office.
Looking for a job
Stanislav Kvashchuk
@stanislavkvashchuk
Senior .NET Backend Engineer (10+ yrs): C#, ASP.NET Core, microservices, SQL Server, Redis, Azure.
IsraelWhat I'm looking for
Senior .NET backend engineer with 10+ years of experience in C#, ASP.NET Core, microservices, SQL Server, Redis and Azure.
At iQbusiness, I developed backend systems for Ernst & Young’s document management platform, including 15+ RESTful APIs serving 10,000+ daily requests with 99.9% uptime. The platform stored 10TB+ of enterprise files and supported full-text search across 100,000+ documents.
I built backend capabilities for real-time collaborative editing in CKEditor, including document synchronization and user presence tracking, and implemented SAML SSO for 1,000+ users. I also optimized SQL Server and Redis data access, improving API response times by up to 60%.
Earlier, I supported the National Bank of Ukraine’s national electronic payment system and conducted information security audits based on ISO/IEC 27001. I’m currently co-developing AI Bakery Gateway, a self-hosted LLM gateway with provider routing, failover, and shared quota tracking.
Based in Israel, open to remote, hybrid or onsite roles.
Experience
Work history, roles, and key accomplishments
IQ
Senior .NET Backend Engineer
iQbusiness
Mar 2020 - Mar 2026 (6 years)
Client: Ernst & Young (Big Four). Built 15+ ASP.NET Core APIs (10,000+ daily requests, 99.9% uptime) across 8+ microservices. Real-time collaborative editing (CKEditor) for 50+ users, SAML SSO for 1,000+ users, Lucene full-text search over 100,000+ documents, 10TB+ on Azure Blob Storage. SQL Server + Redis optimization: up to 60% faster APIs. Docker, Azure DevOps CI/CD.
CL
.NET Backend Developer
Clouds&Software
Dec 2018 - Mar 2020 (1 year 3 months)
Developed backend RESTful APIs using ASP.NET Core and Entity Framework Core. Designed data access layer and integrated MySQL database.
BI
Software Development Engineer (.NET)
bNesis Inc.
May 2017 - Dec 2018 (1 year 7 months)
Developed SDK and RESTful web services for integration with 50+ third-party platforms. Implemented multiple authentication protocols including OAuth and OAuth2.
NU
Software Engineer / Information Security Specialist
National Bank of Ukraine
Apr 2005 - Nov 2015 (10 years 7 months)
Provided third-level support for the national electronic payment system. Conducted ISO/IEC 27001-based information security management audits of commercial banks.
Education
Degrees, certifications, and relevant coursework
HS
Hillel IT School
Java Enterprise, Java Enterprise
2016 - 2017
Completed Java Enterprise training at Hillel IT School.
HS
Hillel IT School
Java Elementary, Java Elementary
2016 - 2016
Completed Java Elementary training at Hillel IT School.
Odesa National Economic University
Specialist Degree (second higher education), Banking
2005 - 2008
Grade: Excellent
Specialist Degree (second higher education) in Banking. Thesis: 'Payment System of Ukraine' (graded Excellent).
Odessa Polytechnic National University
Specialist Degree (equiv. Master of Science), Software Engineering
1999 - 2004
Specialist Degree (equiv. Master of Science) in Software Engineering.
Tech stack
Software and tools used professionally
Availability
Looking for a job
Location
Israel
UkraineSalary expectations
60k-90k USD
Social media
Job categories
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