Lajos Szőke, Developer in Budapest, Hungary
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Lajos Szőke

Verified Expert  in Engineering

Software Developer

Budapest, Hungary
Toptal Member Since
September 2, 2020

Lajos is a founder and CTO of ConfigCat, a feature flag as a service startup where he works as a full-stack developer. His main tech preferences are C# (.Net Core), Angular/Typescript, and MySQL. He also has experience with Python, Node.js, and Java. Lajos also enjoys working as a DevOps engineer (Terraform, Docker, Azure, VPS management, and Docker Swarm). His favorite jobs are projects that allow him to optimize and automate things.


Docker Swarm, Docker, C#, Entity Framework Core, Python, MySQL, Azure...
JavaScript, ASP.NET Web Forms, MSSQLCE, ASP.NET MVC, ASP.NET, C#, .NET...
AvenData Gmbh.
ASP.NET MVC, Java, .NET, Windows Presentation Foundation (WPF), MySQL




Preferred Environment

Slack, Sublime Text 3, Visual Studio Code (VS Code), Visual Studio, Linux, Windows

The most amazing...

...thing I've developed is ConfigCat, a feature flag as a service. I'm one of the founders, and I really love working on the product.

Work Experience


2018 - PRESENT
  • Contributed to the development of the back end of the database (MySQL) and the API (ASP. Net Core).
  • Worked on the ASP.NET Core MVC front-end development and migrated everything to Angular/TypeScript.
  • Dockerized the services, created the full Docker Swarm environment, and used Terraform to provision the infrastructure.
Technologies: Docker Swarm, Docker, C#, Entity Framework Core, Python, MySQL, Azure, Terraform, Visual Studio, Azure DevOps, TypeScript, Angular, .NET Core

Senior Software Engineer

2014 - 2018
  • Worked on, a market-leading online conference tool that has a really large user base.
  • Worked on the back end (C# .NET, MVC, and .Net Core) and served on part of the database team (MS SQL).
  • Created a system that processed the online conference tool's recordings (audio, video, and screen sharing).
Technologies: JavaScript, ASP.NET Web Forms, MSSQLCE, ASP.NET MVC, ASP.NET, C#, .NET, .NET Core

Senior Software Engineer

2012 - 2014
AvenData Gmbh.
  • Developed a web application to show huge amounts of data.
  • Developed an application to migrate SAP databases to the custom database format for further querying.
  • Developed an accounting system for a German company in C# WPF.
Technologies: ASP.NET MVC, Java, .NET, Windows Presentation Foundation (WPF), MySQL

Senior Software Engineer

2008 - 2012
PannonSzoftver Kft.
  • Developed an ERP system mainly in Delphi. Took on a huge part of the production planning development.
  • Developed a synchronization application between FireBird databases in Java.
  • Developed an accounting system (Hungarian) in C# Winforms.
Technologies: Firebird, C#, .NET, Java, Delphi

A feature flag as a service application. I am one of the founders, and I worked on almost everything on this project:
- Database (MySQL)
- Back end (ASP .Net Core Web API)
- Front end (Angular/TypeScript)
- JavaScript-based SDKs
- Python SDK
- .Net SDK
- Docker
- Docker Swarm
- Terraform
- Azure DevOps
- Tech writing (blogs, social media)
2007 - 2010

Bachelor of Science Degree in Software Engineering

University of Debrecen - Debrecen, Hungary


LINQ, Entity Framework, REST APIs, Slack API,, Zoho API


Visual Studio, Sublime Text 3, Slack, Git, GitHub, Visual Studio 2019, Terraform, Docker Swarm, NGINX, GitHub Pages, Figma


.NET Core, Angular, Entity Framework Core, .NET, ASP.NET, ASP.NET MVC, ASP.NET Core, ASP.NET Core MVC, ASP.NET Web Forms, Windows Presentation Foundation (WPF)


C#, HTML, CSS, SCSS, TypeScript, JavaScript, Delphi, SQL, XML, Python, Java


Azure DevOps, REST, RESTful Development


Windows, Visual Studio Code (VS Code), Azure, Visual Studio 2017, Linux, Docker, Raspberry Pi, Ubuntu




APIs, Single-page Applications (SPA), Chargebee, IIS, Internet Information Services (IIS), Web Server (IIS)

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