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Kumaran Vellaisamy
Verified Expert in Engineering
C# Developer
Almere, Netherlands
Toptal member since July 16, 2021
Bio
Kumaran is a technology enthusiast and fast learner interested in understanding business and consumer problems and creating innovative solutions to solve them using technology and adding value. Kumaran has primarily worked as a senior developer and consultant, leading teams and building web and mobile applications.
Portfolio
Grove Engineering Inc
C#, Visual Studio .NET, .NET, REST, JSON
142 Consulting SAS
JavaScript, RabbitMQ, PostgreSQL, React, Stripe Connect, C#, REST, JSON, Blazor
Global Data Science Software Company
C#, Windows Forms (WinForms), Desktop, JavaScript, React, Windows, Unit Testing...
Experience
- C# - 14 years
- JavaScript - 8 years
- XAML - 6 years
- Azure - 5 years
- ASP.NET Core - 5 years
- Entity Framework Core - 5 years
- REST APIs - 3 years
- Xamarin.Forms - 3 years
Preferred Environment
Visual Studio, Git, Azure DevOps, Bitbucket, GitLab, Azure, OneSignal, Kibana, Xamarin
The most amazing...
...thing I've done is modernize a complex WinForms desktop application across multiple sprints without having any impact on its other development processes.
Work Experience
C# Developer
2022 - 2023
Grove Engineering Inc
- Developed an app to create XML files from custom files to be used in radiation software.
- Helped them to migrate all existing custom files into XML files.
- Fixed some bugs in their existing Windows desktop application.
Technologies: C#, Visual Studio .NET, .NET, REST, JSON
Full-stack Developer
2022 - 2022
142 Consulting SAS
- Implemented Stripe Connect to enable customers to receive payments via Stripe.
- Did a high-level architecture, design, and code review of the existing codebase. Provided the necessary action to make the system more secure and manageable.
- Analyzed new feature requirements and provided the plan with the estimates and required technical implementations on top of the features.
Technologies: JavaScript, RabbitMQ, PostgreSQL, React, Stripe Connect, C#, REST, JSON, Blazor
Senior Desktop Software Engineer
2021 - 2022
Global Data Science Software Company
- Worked on modernizing the WinForms desktop application UI.
- Worked with the product manager and UX Designer to evaluate the design and identify the possible implementation approaches.
- Worked with the product manager in estimation, identifying the deliverables for each sprint, and sprint planning.
Technologies: C#, Windows Forms (WinForms), Desktop, JavaScript, React, Windows, Unit Testing, REST
Senior Full-stack Developer
2020 - 2022
Khosla Tech
- Implemented the platform-specific ASPSecurityKit core libraries for all supported platforms. These libraries get the required data from the HTTP request for the request pipeline and process other commands related to authentication and authorization.
- Designed and developed the source pack components for all supported platforms. Most of the components are developed in a shared code model, which reduced the time required to develop new features and maintenance overhead for all platforms.
- Wrote documentation articles about ASPSecurityKit and created samples on how to build SaaS apps using ASPSecurityKit.
- Created a tool to extract and inject C# code blocks from code files based on compiler directives and form a code definition file. These files are again used to inject the extracted code into code files.
- Designed and developed a mechanism to load an angular app inside the Xamarin Android app using WebView to provide the ability to capture different data points as per the doctors’ needs.
- Involved in the development of different components and features for the Gluco mobile application and Gluco Web API.
Technologies: ASP.NET Core, ASP.NET MVC, ASP.NET Web API, ServiceStack, AngularJS, JavaScript, jQuery, Xamarin.Android, SpecFlow, NUnit, Azure Functions, Azure App Service, Azure SQL, Azure Table Storage, Azure Blob Storage API, Azure Service Bus, Azure Application Insights, .NET Core, Azure Active Directory, Azure, Angular, Entity Framework Core, Entity Framework, REST APIs, ASP.NET, SQL, LINQ, Authorization, Authentication, Xamarin.Forms, C#, .NET, Windows, Xamarin, Unit Testing, Integration Testing, REST, JSON
Security Developer
2017 - 2020
Forge Trust
- Involved in implementing and improving authentication and authorization systems like HMAC based authentication, Azure Active Directory-based authentication, and role-based authorization to secure ISCP Web API.
- Involved in the design and development of API for various security-related management activities like user management, permissions management, email throttling, IP management, etc.
- Involved in the design and development of secured automated documentation of ISCP Web API. This resulted in having the API public documentation up to date without any manual work.
- Involved in the development of an integrated validator approach combing field validation and business validations.
- Involved in code reviews, module design discussion and reviews, and production monitoring of errors, security incidents, etc.
Technologies: C#, ServiceStack, Azure Active Directory, Kibana, NUnit, Shaolinq, Web API, JavaScript, AngularJS, Authentication, Authorization, Azure, Angular, REST APIs, SQL, LINQ, SpecFlow, ASP.NET Core, jQuery, Windows, Xamarin, Unit Testing, Integration Testing, REST, MongoDB
Consultant
2013 - 2016
Microsoft
- Involved in the development of several services provided by CPF such as medical insurance claim calculator, provident fund withdrawal calculator, an administrative component of the medical insurance claim, and a few more.
- Developed a generic validation mechanism for all input controls, which applied a generic error message format for each type of validation attribute.
- Led a small team, ensuring the quality of deliverables as a responsibility.
- Developed multiple PoCs to showcase the solution for the problems faced by customers as part of presales.
Technologies: ASP.NET MVC, Universal Windows Platform (UWP), Xamarin.Forms, JavaScript, jQuery, NUnit, TFS, XAML, Azure, REST APIs, ASP.NET, SQL, LINQ, ASP.NET Web API, C#, .NET, Windows, Unit Testing, Integration Testing, REST
Application Developer
2010 - 2013
Inautix
- Involved in analyzing the possibility of migrating the application from WinForms to WPF.
- Developed wrapper and custom controls as an equivalent of existing WinForms controls.
- Developed a framework component called Layout Manager, which handles creating the layout using container controls such as StackPanel, Grid, TabControl, and arranging the application components based on the view configuration.
- Developed a dashboard component called Tile Manager, which supports resizing, moving, expanding, and collapsing tiles. It also supported the import and export of the current state.
Technologies: C#, Windows Forms (WinForms), Windows Presentation Foundation (WPF), XAML, LINQ, .NET, Windows, Desktop, REST
Experience
ASPSecurityKit
https://aspsecuritykit.netASPSecurityKit is an enterprise-grade security framework with identity and access management components for multi-tenant ASP.NET framework, ASP.NET Core, and ServiceStack web applications. It protects the application with a comprehensive security pipeline built on a zero-trust model.
TB Reach Wave 6
A Xamarin Forms-based app to capture the process of referrals, testings, treatment, and outcomes of the TB symptomatic cases in a progressive manner from the TB Reach Wave 6 Project (RIPEND) implemented by TB Alert India (TBAI) with support from RB Reach Wave 6 grant (Stop TB Partnership) in the state of Telangana (INDIA)
Distomatic (Xamarin Forms App)
https://play.google.com/store/apps/details?id=com.magivatech.distomaticDistomatic is a distributor management system to automate your small, medium, and large-sized business. You can manage your end-to-end distribution operations like purchase, sales, inventory, billing, payments, daily issue/receive, returns, expenses, and accounting. It helps you to manage your business systematically and effectively to achieve high profits.
Kawris Ticketing Platform
Kawris is a conversational event ticketing platform. It makes the ticket purchase experience smoother via WhatsApp and Telegram bots. The ticket verification is also handled by WhatsApp and Telegram bots.
Education
2006 - 2010
Bachelor's Degree in Information Technology
Anna University - Chennai, Tamilnadu, India
Skills
Libraries/APIs
LINQ, REST APIs, Windows Forms (WinForms), jQuery, Web API, Azure Blob Storage API, Entity Framework, Xamarin.Android, React, Stripe Connect, Twilio API, Azure API Management
Tools
Visual Studio, Git, Azure App Service, Azure Application Insights, Bitbucket, GitLab, Slack, Microsoft Teams, TFS, Kibana, Microsoft Flow, OneSignal, RabbitMQ, Visual Studio .NET
Languages
C#, XAML, JavaScript, SQL, TypeScript
Frameworks
.NET, Windows Presentation Foundation (WPF), ASP.NET MVC, .NET Core, NUnit, ServiceStack, ASP.NET Core, ASP.NET Web API, ASP.NET, Entity Framework Core, AngularJS, SpecFlow, Angular, Jest, Blazor
Paradigms
Unit Testing, Azure DevOps, REST
Platforms
Universal Windows Platform (UWP), Azure Functions, Azure, Windows, Desktop, Xamarin, Amazon Web Services (AWS)
Storage
Azure SQL, Azure Cosmos DB, Azure Table Storage, JSON, Azure Active Directory, SQLite, PostgreSQL, MongoDB
Other
Xamarin.Forms, Authentication, Authorization, Integration Testing, Shaolinq, Azure Service Bus, Bluetooth, Bots
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