Marcell Toth

Marcell Toth

Mentor
5.0
(78 reviews)
US$20.00
For every 15 mins
98
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ABOUT ME
.NET/ReactJS expert, Team Lead, MCP, Autodidact
.NET/ReactJS expert, Team Lead, MCP, Autodidact

I strongly believe that Code Quality Matters. I hold myself to high standards even in smaller projects, and in my spare time I keep learning about the latest technologies and architectural design patterns.

My favorite topics are performance optimization and concurrency, but I am keen on and proficient in a wide variety of technologies (especially if it has something to do with C# or React which I love). Even though most of my work experience revolves around building ASP.NET Core Web APIs and React/Redux(/TypeScript) frontends, I have had projects involving Windows Forms, WPF, Xamarin Forms / Android, numerous console apps, etc.

Besides learning, I also love to share my knowledge with others. My favorite part of leading the development team at my current workplace is being able to mentor junior devs who share my passion in ever improving their design, code quality and performance.

Check out my self-built blog where I document my developer journey: https://marcelltoth.net

English
Budapest (+01:00)
Joined April 2019
EXPERTISE
5 years experience | 39 endorsements
I started working day to day with React when I began modernizing the UI architecture of the enterprise system I am building with my team ...
I started working day to day with React when I began modernizing the UI architecture of the enterprise system I am building with my team (see Employment). In my current position I work full time on React / TypeScript based libraries and frontend applications as a senior engineer. 90% of the time I use React/Redux with Typescript, bundling with Webpack. This stack - while requiring a little more code - allows me to have complex type checking at compile time, leading to less bugs and cleaner code, while building fast and modern single page applications.
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7 years experience | 20 endorsements
I started "way back then" with .NET 4.0, I mostly built Windows Forms based desktop applications, the most notable being an administrator...
I started "way back then" with .NET 4.0, I mostly built Windows Forms based desktop applications, the most notable being an administrator panel for a custom built PHP webshop I developed for a client. When the first Windows 8 Developer Previews came out in 2011 I started building Metro / Modern / whatever it was called then applications for the new Windows Store. Did I mention I'm keen on new technologies? ;) I did that for a few years, then started moving towards web applications running ASP.NET MVC, later ASP.NET Core, which is what I'm doing in the majority of my time today. Of course I not all my projects are web based, my platform of choice for desktop applications is WPF, and for mobile projects Xamarin.Android. Along the way, I was never satisfied with the "How", I always wanted to know the "Why". I read multiple books and articles about C# language features, how they work, the internals of the .NET CLR, garbage collection, tasks, threading, etc. I love optimizing systems, as much as I love creating them. I also completed my Microsoft Certified Professional certification in C# programming.
3 years experience | 4 endorsements
I have been working 25+ hours a week with ASP.NET Web API 2 / ASP.NET Core for more than 3 years now. Combined with my solid C# understan...
I have been working 25+ hours a week with ASP.NET Web API 2 / ASP.NET Core for more than 3 years now. Combined with my solid C# understanding I believe I can satisfy any business requirement you may have for your custom API, while maintaining high quality and and highly performant architectures and code.
5 years experience
Before my transition into C# I worked almost exclusively with PHP. I have plenty of experience in a wide variety of tasks, including full...
Before my transition into C# I worked almost exclusively with PHP. I have plenty of experience in a wide variety of tasks, including fully custom PHP development, Wordpress customization, ecommerce solutions, but also server administration.
5 years experience | 2 endorsements
8 years experience

REVIEWS FROM CLIENTS

5.0
(78 reviews)
Testdome
Testdome
October 2022
Excellent review work by Marcell on some Xamarin related tasks.
Testdome
Testdome
September 2022
Marcell did a complete and useful review of our Web Testing questions. Recommended.
lpp
lpp
October 2020
Marcell is always amazing! We looked at React Native, Linux and Docker, highly recommended!!!
lpp
lpp
October 2020
Marcell is exceptional, he truly understands engineering concepts and is very willing to share, highly recommended!
lpp
lpp
October 2020
Marcell is really exceptional, he is always willing to go into every detail!
lpp
lpp
September 2020
Marcell is exceptional, there are very few engineers of this calibre, highly recommended!
lpp
lpp
September 2020
Extraordinary! Marcell is an expert and a pleasure to work with!
Mikhail Molchanov
Mikhail Molchanov
September 2020
Marcell was very helpful. He helped me to better understand unix security, how to find vulnerabilities/write exploits. It was a pleasure to work with him! Highly recommend him!
lpp
lpp
September 2020
Marcell is a rare engineer, extremely talented and a privilege to work with! Highly recommended!
lpp
lpp
September 2020
Marcell is unique in his approach to teaching and always a complete pleasure to work with!
EMPLOYMENTS
Senior Frontend Engineer
11sigma
2020-02-01-Present
At 11sigma I joined an elite team of experienced engineers working for https://stoplight.io/ on their API documentation product. Our dai...
At 11sigma I joined an elite team of experienced engineers working for https://stoplight.io/ on their API documentation product. Our daily tasks vary greatly from UX design to performance optimization dealing with huge amounts of data, to working with Product to find the best solution for our customers, to mentoring junior engineers who just recently began their journey in web development.
HTML/CSS
Node.js
API
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HTML/CSS
Node.js
API
Responsive Design
TypeScript
React
JavaScript
Webpack
RESTful API
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Full Stack Developer, Team Lead
Appsint Ltd.
2017-03-01-Present
With a small team we are building the "Wordpress of Enterprise Systems". A single code base powers multiple vasty different enterprise pr...
With a small team we are building the "Wordpress of Enterprise Systems". A single code base powers multiple vasty different enterprise projects ranging from ticketing to complex workflow-heavy ERP solutions. Besides hands on development, since 2018 I am in charge of leading the development team and mentoring our junior devs. When I started, the project was a mess, a monolithic, badly structured WebForms application (a few classes with 5-15k lines each), which would not even compile in one step. Source Control was very simple (single branch TFVC repo), and no automated build process of any kind. Under my supervision this was slowly transformed into its current state: A well structured ASP.NET Web API (soon .NET Core) with good separation of concerns, a separate React based SPA frontend, supported by a well defined git workflow, automated CI and our custom built CD application.
C#
TypeScript
React
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C#
TypeScript
React
Webpack
Redux
.NET Core
ASP.NET Core
Asp.net web api 2
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PROJECTS
PriceSailor
PriceSailor LLP (UK)
2019
I am building a full web platform for the parcel forwarding service PriceSailor. The back end is an ASP.NET Core 3 GraphQL API using Doma...
I am building a full web platform for the parcel forwarding service PriceSailor. The back end is an ASP.NET Core 3 GraphQL API using Domain Driven Design, the frontend is based on Typescript / React / Apollo.
OAuth 2.0
Domain-Driven Design
TypeScript
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OAuth 2.0
Domain-Driven Design
TypeScript
React
GraphQL
ASP.NET Core
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Neptun LiteView Project
Hobby Project
2018
This project is in Hungarian (although the code is in English), but the main idea is: Students here have a very outdated system which mak...
This project is in Hungarian (although the code is in English), but the main idea is: Students here have a very outdated system which makes it really hard to check your schedule, exams or other everyday information. So I decided to build a mobile app to help this. As there is no official API, I have to scrape the official website, but it works very reliably, the app is used by a few hundered students every month.
Web Scraping
Xamarin.Android
Open Source Software
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Web Scraping
Xamarin.Android
Open Source Software
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