Efrain Contreras

Jacksonville, FL

Senior Full Stack and Mobile Solu ons

954-***-**** / ad4ida@r.postjobfree.com

Summary

Considered as an efficient so ware developer with vast experience in different fields of compu ng. With skills in various pla orms in both backend and frontend. The same is true in the development of mobile solu ons on both iOS and Android. Extensive experience in SQL and non-SQL databases. Careful, hard worker and highly organized in group management as a so ware architect, knowledge of planning and development tools such as SCRUM, Dev-Ops. Extensive experience in administra ve management and development in Azure and AWS clouds.

Technical Skills

• Programming and design in WEB

• WEB Services (API / REST) and Windows services

• Azure, AWS administra on and Google Cloud.

• Git / TFS, SCRUM and Agile (Cer fied)

• Mobile solu ons in Android (Android Suite) and iOS (Xcode / Swi 5) also as in Xamarin Forms

• Designs in SQL PL for MS SQL and ORACLE.

• Front Ends in JavaScript, HTML5, CSS, Angular, etc. And Back End in C # and vb.Net Solu ons in MVC, MVVM, API

Professional Experiences

Cognizant Technologies: Johnson & Johnson and Medtronic Jacksonville, Florida Software Developer (November 2021 – January 2024)

Responsible for developing and maintaining exis ng so ware. These applica ons are developed on an MVVM and MVC pla orm. An ORACLE database and another non-SQL database are used. The applica ons are based on C#, HTML5, CSS, XML, React, Angular and other so ware building elements. Not all applica ons are based on cu ng-edge technology, some of them require a knowledge base of outdated technology. Such projects are: Projects Performance and skills

Maximo Apply creden als granted to a group of users for specific roles. Use of IBM Maximo Prisym Create, modify, and remove roles and privileges to users. Provide support to add, modify and remove printers as well printer troubleshoo ng Use of ORACLE

CDTS Maintenance supervision and development of new func onali es for obtaining data through reading bars of the products being processed. Use of Visual Studio 2019 in C# language. DBS: ORACLE. Architecture MVVM and API/MVC RMT Monitoring robo c ac vi es in the factory. Use of Visual Studio 2019 in C# language. DBS: ORACLE. Architecture MVVM and API/MVC

Chip’s Reader Collect data through chip magne c reader. Use of MVVM architecture in C# EDHR2 Implemen ng several services into this dashboard. Visual Studio 2019 in C# HMI Maintain dashboard to connect users to machine or device. Use of ORACLE and C# SATOLabel/ZEBRAPrinter Expansion of the "SATOPrinter" applica on to access a ZEBRA printer. Use of Visual Studio 2019 in C# language. DBS: ORACLE. Architecture MVVM and API/MVC DELOITTE - Remote

IT Leader Team Developer .NET and Angular (December 2020 – June 2021) Deloite needed to organize a team of so ware developers in Lan America (Colombia) for the development of a version of the MAT-USA so ware. This version was oriented for interna onal use and was called MAT-Global. The team of about twenty people was in coordina on with teams from other countries. The project was based on micro-system architecture and used the AWS cloud delivery service. The applica on was developed en rely in the cloud and was managed using Dev-Op for the distribu on of tasks and organiza on of the team. Projects Performance and skills

MAT-Global Performing the role of as a team leader to organize, manage, help, assists, and promote a team of developers in

Colombia for the MAT Global project at Deloite.

The project was based on the architecture of microservices. The project was developed in Angular 11, SQL Database, MVC API of webservices in C #, HTML, CSS,

React, among other technologies including .NET using framework NET 4.5 through Visual Studio and Visual

Studio Code.

The environment was running under an AWS’ virtual machine. I was working in DevOps and Agile and I worked based in both concepts, tools and prac ces. Also, I worked with AWS test, debugging environment and deployment MAT-USA Addi onal changes and maintenance of the MAT-USA applica on that is developed in AngularJS. An extension of the applica on was made in the same framework (AngularJS). The en re project was managed by a DevOps Git source control and using SCRUM method G4S USA – Jupiter, FL

Senior WEB & Mobile Developer .NET (October 2015 – June 2020) G4S are required to upgrade their STSR so ware from a Monolithic to a most affordable applica on adapted to the latest technologies. The applica on was upgraded to MVC pla orm and later to an API Web-service to atend a newest version in Web site and mobile solu ons.

Projects Performance and skills

STSR Modified the existent version (1.0 and 1.5) from monolithic architecture to a MVC structured solu on.

through the .NET Technology.

Thus, it was intended to convert these versions from Vb.Net to a C# and generate version 2.0.

Later, suggested working on a Web service to develop a Mobile solu on and link the Web applica on to it.

The new versions 2.2 and 2.3 involved technologies like jQuery, JSON, Bootstrap, CSS, HTML5, and

others.

Within the framework of .NET 3.0 technology, version 2.3 involved some Angular solu on, JSON, Social

Media Authen ca on and REST API Authen ca on (HTTPS). The Web service involved API RESTFULL architecture. Addi onally, further the na ve authen ca on, I implemented an In-house encryp on system.

STSR-Mobile Created a mobile solu on in Xamarin forms for iOS and Android. RISK 360 Created a mobile solu on for an existent website dedicated to surveys. Ini ally, the solu on was developed in Xamarin Android, but later they decided to move to Xamarin forms.

G4S Timeline Developed a solu on in Google cloud to process confiden al data from different loca on in the world (South

Africa, England, South America, and USA)

The process involved spreadsheet tables interac ng by a JavaScript code behind the scenes. Also, the access to different blocks inside the Google Cloud G4S RingCentral/

G4S SMS

Based in Google Cloud.

Developed a C# applica on to receive and send calls and SMS (G4S_SMS). Developed an interface using Google Cloud, a third-party company called RingCentral and the G4S_SMS (G4SRingCentral)

Used Google SDK to manage the G4S email account and validate the authen city of each user.

Everything was writen in C# language.

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