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Mariusz Kotas

Software Craftsman

Summary

Passionate pragmatic software developer from Czech Republic who is continuously improving software craftsmanship.

I'm an independent software freelancer/consultant. Don't hesitate to contact me if you have a custom solution you would like me to implement.

Skills


I'm putting emphasis on a software quality and clean code. Interested in helping clients with their domain, focusing on solving their problems. I have great expertise in all .NET technologies.

Architecture

  • Clean, pragmatic codebase
  • SOLID principles, TDD, design patterns
  • DDD, CQRS, Event sourcing
  • Microservices, REST, gRPC

.NET development

  • Perfect knowledge of C#
  • WPF, Windows Forms, ASP.NET MVC, WebAPI, UWP/WinRT
  • Entity Framework
  • Experience with DI containers, DevExpress, xUnit, NuGet and ReSharper
  • SSO - OpenID, OAuth (IdentityServer3/4)
  • Keeping up to date with .NET Core, EF Core, ASP.NET Core and cross platform development

Web frontend

  • Javascript, Typescript
  • SPA - Angular 2+, VueJS
  • ASP.NET MVC and WebAPI
  • GraphQL and REST API design

Other

  • Good knowledge of SQL language
  • Experience with PostgreSQL, Microsoft SQL Server, SQLite and PL/SQL
  • Version control - SVN, Git
  • Continuous integration - TeamCity, Bamboo, Jenkins
  • Agile methodology - Scrum (Jira, Confluence), Kanban
  • Experience with functional programming paradigm (Haskell and F#)
  • Knowledge of Java, C++, Python
  • Bitcoin, cryptocurrencies and quantitative trading

Professional experience

IT Contractor

  • IT Contractor
  • Prague, Czech Republic
  • January 2017present
  • Flexiana s.r.o.
  • Alza.cz a.s.

Co-Founder

  • A fully automated quantitative crypto trading

Senior Software Developer

  • Innovative projects
  • .NET Core, Angular 2

Software Developer

  • Hospital information system
  • Chemical process simulator
  • IS builder: framework for rapid development large information systems

Software Developer (C#)

  • Operating system for pensioner

Freelance experience

Nexus

  • Back-office system
  • Frontend: web application written in Angular 7, Ant design
  • Backend: .NET core, IdentityServer4, Hangfire
Screen of Nexus
Screen of Nexus
Screen of Nexus

TraXBot

  • Fast and optimized execution platform for our high-frequency trading (HFT) strategies
  • Reactive platform based on .NET core and Rx
Screen of TraXBot
Screen of TraXBot

Adnext Crypto

  • Crypto trading tools
  • Web application ASP.NET MVC + VueJS and SignalR (websockets)
Screen of Adnext Crypto
Screen of Adnext Crypto
Screen of Adnext Crypto

Primus Monitoring

  • Monitoring system for industrial washing machines
  • Desktop and web application (WinForms, ASP.NET MVC, DotVVM)
Screen of Primus Monitoring
Screen of Primus Monitoring
Screen of Primus Monitoring

Keyword Filter Application

  • Postprocessing for Google AdWords planner
  • Desktop application (WPF, Material design)
Screen of Keyword Filter Application
Screen of Keyword Filter Application
Screen of Keyword Filter Application

Projects & publications

Crypto websocket clients

  • Websocket connectors to various crypto exchanges
  • Bitfinex, Bitmex and Binance

Websocket client

  • Pure websocket client with built-in reconnection and error handling

Encryptor

  • Hobby project, the encryption app (Windows 10) for paranoid people

MKEncryptor.Core

  • Open-source encryption portable library/wrapper for C#. It is used in commercial product Encryptor (see above).

MKEventAggregator

  • Open-source library. Event aggregator / Message bus for .NET with plugins system support

MKPluginsSystem

  • Example of plugins system in the .NET world

Super Maze

  • Multiplatform game. It's created with the MonoGame framework (Open Source version of the XNA)

Issues of acquiring client data with touch-based interfaces

  • Bachelor thesis
  • Implementing touch-based web client for existing hospital IS

Education

Applied informatics

  • Masaryk University, Faculty of Informatics
  • Brno, Czech Republic
  • Bachelor's degree programme
  • 20122014

Languages

  • Czech - Native or bilingual proficiency
  • Polish - Native or bilingual proficiency
  • English - Professional working proficiency

Favorite books

  • Pragmatic Programmer (A. Hunt, D. Thomas)
  • Clean Code and Agile Principles, Patterns, and Practices (Uncle Bob)
  • Domain-Driven Design: Tackling Complexity in the Heart of Software (E. Evans)