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$25 USD / hour
Flag of VENEZUELA
maracaibo, venezuela
$25 USD / hour
It's currently 5:01 AM here
Joined November 23, 2020
1 Recommendation

Efraín José R.

@niarfedevelop

 4.6 (52 reviews)
5.4
5.4
87%
87%
$25 USD / hour
Flag of VENEZUELA
maracaibo, venezuela
$25 USD / hour
90%
Jobs Completed
89%
On Budget
91%
On Time
16%
Repeat Hire Rate

EXPERT IN SOFTWARE DEVELOPMENT / BACKEND /DBA

More than 15 years of experience. Database modeling and creation specialist, RestFul Api creation, SQL query optimization, management of NoSql data managers. Expert in SQL, PL/SQL. Database developer. Expert in data replication MYSQL SERVER and MARIADB SERVER, master-master, master-slave and Multi-source replication (several masters a single slave). Extensive Experience Development and Maintenance of Desktop Systems (PRODUCTION, INVENTORY, PURCHASES, SALES, PAYMENTS, ACCOUNTING, BANK CONCILIATION, PROCESS CALCULATION OF PRICES BASED ON COST MANAGEMENT, AMONG OTHERS). Extensive Experience Development and Maintenance of Websites. Expert in Point of Sale System. Experience in implementation of fiscal printers (Bixolon Srp 270, Bixolon Srp 350, Bixolon Srp 812, Tally, Okidata, among other printer models), all models of HKA (THE FACTORY). More than 10 years of experience working with ERP (Example : ERP Adaptapro Venezuela) Expert in Odoo System, Dolibarr, I provide the support service for new adaptations, implementations, maintenance, among others. Payroll system experience, fingerprint capture system. Expert in creating all kinds of reports with CRYSTAL REPORT, PHP, JAVA, among others. JAVA PHP JSP PYTHON (PyChart, Qt Designer) NODEJS LOOPBACK TYPESCRIPT REACT C# BLAZOR SERVER RADZEN BLAZOR COMPONET VISUAL BASIC 6.0 DELFI VB.NET HTML XML JAVASCRIT BOOTSTRAP CSS MS ACCESS MYSQL SERVER POSTGRESQL MARIADB SQL SERVER ORACLE MONGODB SQL, PL/SQL CRYSTAL REPORT UML WORDPRESS DOMPDF
Freelancer MySQL Developers Venezuela
See all MySQL Developers in Venezuela

Contact Efraín José R. about your job

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Portfolio

10145505
Convertidor de Bases Numéricas con JAVASCRIPT, HTML, CSS y BOOTSTRAP.
Convertidor de Bases Numéricas con JAVASCRIPT, HTML, CSS
9595865
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
9593465
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
9515192
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
9475811
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
9457555
An entity relationship diagram (E-R) was created based on a given statement and then the E-R was converted to a relational model, DIA software was used.
Entity Relationship Diagram (E-R) and Relational Model
An entity relationship diagram (E-R) was created based on a given statement and then the E-R was converted to a relational model, DIA software was used.
Entity Relationship Diagram (E-R) and Relational Model
10145505
Convertidor de Bases Numéricas con JAVASCRIPT, HTML, CSS y BOOTSTRAP.
Convertidor de Bases Numéricas con JAVASCRIPT, HTML, CSS
9595865
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
C# application with TXT files for enrollment process and payment of student fees
C# Application With TXT Files for Registration Process
9593465
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
Development of application for inventory of pipes per unit and cuts, using PHP 8.0, MARIADB 10.5, JAVASCRIPT, JQUERY, AJAX.
Simple Web Application for Inventory Management
9515192
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
Creation of application with user authentication by levels, CRUD and sending of mail when registering the user. Visual studio 2019 was used with VB.NET and ACCESS and GMAIL email account for sending mail via SMTP.
Authentication with VB.NET and Access user levels, send Mail
9475811
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
Application in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen Blazor Componet, C #, HTML, Bootstrap.
App in Bazor Server, .NET 5.0, Dapper, SQL SERVER, Radzen
9457555
An entity relationship diagram (E-R) was created based on a given statement and then the E-R was converted to a relational model, DIA software was used.
Entity Relationship Diagram (E-R) and Relational Model
An entity relationship diagram (E-R) was created based on a given statement and then the E-R was converted to a relational model, DIA software was used.
Entity Relationship Diagram (E-R) and Relational Model

Reviews

Changes saved
Showing 1 - 5 out of 50+ reviews
Filter reviews by:
5.0
$70.00 USD
cambios y arreglos en front end laravel
Exelente todo en tiempo en forma, no le pongo 10 extrellas por que la plataforma no lo permite ! Gracias Efrain
PHP
Website Design
MySQL
HTML
Laravel
User Avatar
Flag of Ferico V.
@rtrsrl
•
2 months ago
1.0
€20.00 EUR
Reparación código php -- 2
La verdad que al principio, parecía que sabia lo que hacia, al final se perdió la confianza mutua y no se finalizo nada, después de 3 semanas. Lo único bueno, que cancelo y pudimos recuperar el dinero sin problemas.
PHP
Website Design
HTML
User Avatar
Flag of Sanz I.
@TrackCloud
•
5 months ago
5.0
$100.00 USD
control de inventarios en accesss
Logramos hacernos entender, fue amable y obtuve el resultado que queria.???
SQL
Microsoft Access
MySQL
User Avatar
Flag of Ixchel B.
@baezixchel
•
1 year ago
5.0
$90.00 USD
Control de Contratos
Entendió rapidamente las directivas del trabajo, aportó ideas y generó iniciativa. Una vez comenzado, todo fue normal y de acuerdo a las expectativas.
PHP
phpMyAdmin
User Avatar
Flag of Jorge P.
@JCP67
•
1 year ago
5.0
€35.00 EUR
Manage a database with phpMyAdmin and implement a CRUD application in PHP. // Gestionar una base de datos con phpMyAdmin e implementar una aplicación CRUD en PHP.
Es un gran profesional, entiende 100% lo que está haciendo y se comunica genial. Ha sido un placer!!
PHP
SQL
Software Architecture
MySQL
Database Programming
T
Flag of Marc C.
@tomeuquely33
•
1 year ago

Experience

Backend / DBA / Consultant Adaptapro ERP Open Source

Personal
Jan 2017 - Present
Actualmente trabajo independiente emprendiendo con mi propia empresa de sistemas.

Backend / DBA

TECNOLOGIA ADELFUS, C.A.
Mar 2016 - Aug 2017 (1 year, 5 months)
Database modeling (mysql workbench), database implementation (relational and non-relational, creation of RestFul and Soap services api, use of StrongLoop framework (NodeJS), django (Python), non-SQL data managers: ( MongoDB, Redis) and relational: (Mysql Server, PostgreSQL, and SQL Server) Management of repositories with GIT, use of Scrum methodology (Target Process).

Adaptapro ERP Consultant

Independent
Dec 2014 - Feb 2016 (1 year, 2 months)
Customer Service Provider with ERP Adaptapro. Development, implementation and improvement projects for clients.

Education

Informatics Engineer

Universidad del Zulia, Venezuela 2013 - 2016
(3 years)

Higher University Technician

Universidad del Zulia, Venezuela 2006 - 2009
(3 years)

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Top Skills

MySQL 34
PHP 31
SQL 21
C# Programming 17
HTML 13

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