Athanasios Koltsidas
Back End Developer at Flagstone
United Kingdom
Summary
👤
Senior🎓
Top SchoolAthanasios Koltsidas is a pragmatic back-end developer with 11 years of experience building and evolving SaaS platforms and data-driven systems across finance, logistics, and enterprise security. He has shipped production APIs and scalable processing pipelines using the Microsoft stack (ASP.NET Core, Web API), Azure services, message-driven architectures and polyglot persistence (MySQL, MongoDB, ArangoDB). Comfortable working end-to-end, he pairs domain-driven design and CQRS patterns with hands-on operational delivery across on-prem and cloud CI/CD environments. Notable projects include rebuilding scalable .NET processing for real-time analytics at Egress and driving multi-tenant SaaS backend work for IsoMetrix and Flagstone. Based in the UK, he balances engineering rigor with curiosity—an avid marathon runner and coffee aficionado who brings a hacker’s troubleshooting mindset to complex systems.
11 years of coding experience
21 years of employment as a software developer
Master of Engineering - MEng, Computer Science, Master of Engineering - MEng, Computer Science at Computer Engineering and Informatics Department, Patra
Greek, English
Github Skills (22)
api-client10
dotnet10
csharp7
driver6
dotnet-core6
react5
tailwindcss5
api5
javascript4
pdftk4
nextjs4
arangodb3
database3
graph3
linq2
Programming languages (4)
Github contributions (5)
sakisk/CompaniesHouse.NET
Aug 2018 - Feb 2023
A simple .NET client wrapper for CompaniesHouse API
Contributions:35 pushes, 12 branches in 4 years 6 months
api-clientapidotnetclient-wrappercompanieshouse-api
sakisk/dotnetsheff
Aug 2018 - Jan 2020
dotnetsheff Website
Contributions:25 pushes, 9 branches in 1 year 4 months
dotnetcsharpdotnet-core
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