Rolando Malena, Developer in Cotui, Sánchez Ramírez Province, Dominican Republic
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Rolando Malena

Verified Expert  in Engineering

.NET Developer

Location
Cotui, Sánchez Ramírez Province, Dominican Republic
Toptal Member Since
June 29, 2018

Rolando Malena has spent over eight years of experience developing applications using C# and has worked on nine projects for small and medium companies, developing desktop, web, and mobile applications. He specializes in developing desktop applications and web APIs as a back-end developer. He is very humble and eager to learn and grow more as a professional engaging with people and newer technologies as time goes on.

C#.NETC#.NETXAMLModel View ViewModel (MVVM)ASP.NETASP.NET MVCJSON.NET CoreFull-stackWindows Forms (WinForms)Microsoft SQL ServerSQLDatabasesMicrosoft Silverlight

Portfolio

IQzone (via Toptal)
Subversion (SVN), Microsoft SQL Server, Visual Studio, Microsoft Power BI...
Tienda Malena S.R.L.
Microsoft SQL Server, Visual Studio, Windows Presentation Foundation (WPF)...
Centro Médico Núñez Hernández
Microsoft SQL Server, Visual Studio, Model View ViewModel (MVVM)...

Experience

.NET - 8 yearsC# - 8 yearsWindows Presentation Foundation (WPF) - 6 yearsASP.NET - 4 years.NET Core - 3 yearsASP.NET Core - 3 yearsAPI Integration - 3 years

Availability

Part-time

Preferred Environment

Git, Microsoft SQL Server, Visual Studio, Windows

The most amazing...

...project I've worked on was maintaining a workflow for importing and massaging analytic data from 25+ sources (Web APIs) and regularly adding new sources.

Work Experience

Back-end Software Developer

2018 - 2020
IQzone (via Toptal)
  • Worked and maintained the external analytics import process to import and massage data from 25+ web APIs.
  • Implemented a retry mechanism on the above process to perform multiple attempts when requesting the metrics via HTTP requests improving the reliability by 200%.
  • Refactored 90% of the code for the above process increasing maintainability by 300%, saving significant time when implementing and/or updating external analytics sources.
  • Improved a telemetry data import process by designing and implementing a multi-threaded workflow that accelerated the import process by 300%.
  • Designed and implemented a web API that allowed an external portal to update saved publisher data, exchange mapping information, and retrieve publisher metrics.
  • Implemented workload to send specific saved data to a development environment through web requests, allowing us to test with real data without compromising it.
  • Updated the application settings workflow to hold values for multiple environments and the interpretation of such within the application.
  • Worked as part of a development team to improve the tools and user experience for the ad-operations team.
Technologies: Subversion (SVN), Microsoft SQL Server, Visual Studio, Microsoft Power BI, ASP.NET, .NET, C#

Software Developer

2012 - 2018
Tienda Malena S.R.L.
  • Developed an inventory system to keep track of purchased and sold products that accelerated decision making by 500% while purchasing new products.
  • Supported reading and generating product barcodes incresing efficiency by 300% when selling products, dispatching customers three times faster.
  • Supported managing customers, invoices, payments, etc.
  • Maintained and enhanced such applications and made sure the software is always on production.
  • Managed database integrity.
Technologies: Microsoft SQL Server, Visual Studio, Windows Presentation Foundation (WPF), .NET, C#

Software Developer by Contract

2016 - 2017
Centro Médico Núñez Hernández
  • Developed a new multiple inventory system to control inventory within multiple departments that reduced time in decision making by 800% deciding what merchandise was needed.
  • Implemented product management and purchases from the main department to easily look quantities of products on each department, reducing consulting time by 500%.
  • Implemented the ability to transfer products within departments, consume products on patients, etc.
  • Supported reading and generating product barcodes speeding up by 300% the process of reporting transfers between departments and consumed products.
  • Created a complex algorithm to manage the inventories from the database.
Technologies: Microsoft SQL Server, Visual Studio, Model View ViewModel (MVVM), Windows Presentation Foundation (WPF), .NET, C#

Payroll System for Meat Suppliers

Developed a desktop application that allows users to register departments, occupations, employees, incentives, extra hours, discounts, etc. It generates a monthly reports with details of how much to pay each employee based on the data input.

Technologies: C#, .NET Framework, WPF, MVVM, Visual Studio, SQL Server, Entity Framework

Online Repository for Teachers

Developed an online repository that would allow registered teachers to upload files (Word documents, PowerPoint presentations, PDFs, Image files, etc.) as content for multiple subjects that would be downloadable in the future.

Technologies: C#, .NET Framework, ASP.NET MVC, HTML5, CSS3, JavaScript, jQuery, Visual Studio, SQL Server, Entity Framework

SnapDog

https://www.microsoft.com/en-us/p/snapdog/9nblggh4wr96
Develop a UWP application that would allow its users to see and save locally funny pictures of dogs gathered from multiple sources that updates daily. It was a personal project.

Technologies: C#, .NET Framework, UWP, MVVM, Visual Studio, SQL Server

Patient Management System for a Medical Dispensary

Developed a desktop application so employees in a medical dispensary could register, diagnose, treat, and apply medications to patients.

Technologies: C#, .NET Framework, Windows Forms, Visual Studio, SQL Server

Currency Calculator

https://www.microsoft.com/en-us/p/currency-calculator/9nblggh0n8cs
Developed a Windows Phone 8 application that would allow its users to convert between currencies with a few taps. It was later ported as a UWP to be able to download from the Microsoft Store. It was a personal project.

Technologies: C#, .NET Framework, Windows Phone 8, UWP, MVVM, Visual Studio, SQL Server

eCommerce Website to Advertise Cars on Sale

Developed a web application that users and companies could register to and buy advertisement plans to post any vehicle on sale to make it visible to many potential buyers.

Technologies: C#, .NET Framework, Silverlight, WCF, Visual Studio, SQL Server

Online Encyclopedia of Mathematics for Children

Developed an online encyclopedia that allowed authorized users to add and manipulate content (text, images, videos, hyperlinks) that would allow children to learn simple concepts in the field of mathematics.

Technologies: C#, .NET Framework, Silverlight, WCF, Visual Studio, SQL Server

Languages

C#, XAML, C#.NET, HTML5, JavaScript, CSS3, SQL, CSS, HTML

Frameworks

Windows Presentation Foundation (WPF), ASP.NET, ASP.NET MVC, .NET, .NET Core, Bootstrap, Entity Framework Core, ASP.NET Core, ASP.NET Core MVC

Libraries/APIs

Web API 2, Windows Forms (WinForms), jQuery, Entity Framework

Paradigms

Model View ViewModel (MVVM), REST

Storage

JSON, Microsoft SQL Server, Databases

Other

API Integration, APIs, CSV, CSV File Processing, Full-stack

Tools

Microsoft Silverlight, Visual Studio, Git, Subversion (SVN), Microsoft Power BI

Platforms

Universal Windows Platform (UWP), Windows, Azure

2009 - 2015

Bachelor's Degree in Computer Science

Instituto Tecnológico del Cibao Oriental (ITECO) - Cotuí

FEBRUARY 2019 - PRESENT

Complete ASP.NET Core 2.1 Course

Udemy

MARCH 2018 - PRESENT

Xamarin Forms – Build Native Cross-platform Apps with C#

Udemy

JUNE 2017 - PRESENT

The Complete ASP.NET MVC 5 Course

Udemy

OCTOBER 2015 - PRESENT

Introduction to MVVM

Microsoft Virtual Academy

JULY 2015 - PRESENT

JavaScript Fundamentals for Absolute Beginners

Microsoft Virtual Academy

JULY 2015 - PRESENT

HTML5 & CSS3 Fundamentals: Development for Absolute Beginners

Microsoft Virtual Academy

JUNE 2013 - PRESENT

Building Apps for Windows Phone 8 Jump Start

Microsoft Virtual Academy

MARCH 2013 - PRESENT

Programming with C# Jump Start

Microsoft Virtual Academy

AUGUST 2012 - PRESENT

Microsoft Silverlight

Microsoft Virtual Academy

NOVEMBER 2011 - PRESENT

Software Development Techniques

McFree Consulting Group

SEPTEMBER 2011 - PRESENT

Web Development with ASP.NET 4.0

Instituto Tecnológico del Cibao Oriental (ITECO)

MARCH 2011 - PRESENT

Programming with Visual C# 2010

Instituto Tecnológico del Cibao Oriental (ITECO)

SEPTEMBER 2010 - PRESENT

Databases with SQL Server 2008 R2

Instituto Tecnológico del Cibao Oriental (ITECO)

DECEMBER 2008 - PRESENT

Basic English

Instituto Tecnológico del Cibao Oriental (ITECO)

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