Top Upwork Freelancers

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  1. Jesus Enrique Gutierrez Cortazar

    Jesus Enrique Gutierrez Cortazar

    Senior Software Developer

    Mexico - Tests: 5

    I'm a full-stack software developer. I use to follow and implement code standards and also to audit and modify code for a better performance, knowledge and understanding. The best part is that i love what i do as i live for it. It's like i'm beeing payed for having lots of fun. Wait, that's true in fact!!! I love technology and development innovation and i when i'm sleeping i dream about code, implementations and deployments. I have experience developing professional enterprise software solutions under many technologies, mainly with Java and Ruby On Rails. I have good written and verbal english communication skills. I consider myself as proactive, responsible and can be part of any team work. It doesn't matter what's the problem to solve or what's the programming language to solve it, i can learn it and will solve it in the best possible way.

    $22.22 /hr
    1,485 hours
    5.00
  2. Daniel Guillermo Bareiro

    Daniel Guillermo Bareiro

    GNU/Linux and Unix system administrator

    Argentina - Tests: 2 - Portfolio: 2

    I manage and use free/open source software and GNU/Linux (most experienced Debian) since 2000. I have also participated in numerous conventions related to these themes (some of them as speaker) and collaborating with the discovery of bugs in applications for contribute with the community. Specialties: Networks and operating systems security, monitoring technologies. Advanced knowledge of GNU/Linux environments and virtualization platforms. LANs, WANs, VPNs, Firewalls, TCP/IP. Description of services: ---------------------------------- Servers: ====== Installations, configurations and maintenance plans for servers running GNU/Linux or free BSD operating systems range. * Planning, installation and configuration of GNU/Linux systems as both free and open source systems. * Installation, configuration and maintenance of servers of BSD range: FreeBSD and OpenBSD. * Print servers. * Mail servers with spam and virus filters. * Proxy servers. * Fax servers. * Corporate instant messaging servers. * Install and configure DNS servers. Procedures for domain management. * Management servers for uninterruptible power supplies. * Web servers (Apache, PHP, MySQL and PostgreSQL). * Database servers (MySQL and PostgreSQL). * DHCP servers. Networks and Infrastructure: ===================== Installation, maintenance and failure analysis of networks. High-availability systems, mass storage, remote backup, and monitoring equipment and services. * Installation and maintenance. * Firewalls. * VPNs. * DMZs. * RAID, SAN and NAS systems. * Implementation of VoIP telephony systems. * Virtualization systems (for production systems, development and testing). * Remote backup systems. * Monitoring systems. * Control, preventive analysis and resolution of faults in networks. * Installing and configuring high availability clusters. Consultancy: ========== My main goal is to provide a work environment based on trust, integrity and transparency, in order to become your strategic partner to help you realize your projects. My experience in the field of free/open source technologies allows me to offer a wide range of consulting services for your business, which include audit and analysis of systems, applications and networks, migration to free and open source systems, and systems integration, among others. * Migrating to free and open source systems. * Network analysis. * Security analysis. * Configuring applications. * Systems integration.

    $36.67 /hr
    55 hours
    4.92
  3. Steven Stovall

    Steven Stovall

    DevOps, Cloud (AWS/Google), Security. Development: Rails/Python/PHP

    United States - Tests: 2

    I enjoy solving challenging problems and utilizing technology to creatively design efficient, cost-effective solutions to meet business needs. Current Certifications: CISSP, CCNP, Net+/Sec+, MCP Cloud (AWS/Rackspace), Linux, Windows, VMware HA/vMotion/vCenter Open Source Software: Apache, nginx, Redis, elasticsearch, Zabbix, Logstash Information Security Auditing, Configuration, Policy Networking: Visio Diagrams, IPSEC/SSL VPNs, OSPF/EIGRP/BGP, Adaptive Security Appliances (ASAs), Wireless Controllers, F5 LTM, WiFi (RF Design) Information Security: Visio Diagrams (architecture), PCI DSS compliance, Splunk (syslog) Vulnerability Audit and Penetration Testing: Metasploit, Nexpose, Nessus, Vulnerability Reporting, Patch Management Development: Ruby/Rails, Git, Python, PHP, Perl, PowerShell, Bash, .NET

    $67.00 /hr
    55 hours
    5.00
  4. Daniel Yavorovich

    Daniel Yavorovich

    System Administrator

    Ukraine - Portfolio: 1

    Operating Systems ● FreeBSD ● Linux Security ● iptables ● openssl ● jail ● clamav ● mod_security ● mod_clamav DNS ● Bind ● PowerDNS (+PostgreSQL / +MySQL) HTTP ● Apache ○ MPM: prefork, worker ○ mod_ssl, mod_php, mod_wsgi ● Nginx ○ Access control ○ Autoindex ○ Fast-CGI ○ uWSGI ○ Proxy ○ Cache ○ SSL ○ upload_progress_module ○ Control panel integration ■ Virtualmin ■ DirectAdmin ■ Plesk Proxy ● squid ○ basic auth ○ transparent proxy ○ cache ● 3proxy ○ http/socks ○ auth Raid ● Linux ○ md(0,1,5,6,10) ● FreeBSD ○ Gmirror / Striping File Systems: ● Ext 2,3,4 ● ReiserFS ● XFS ● OCFS2 ● ZFS (port to FreeBSD) ● CEPH CVS ● SVN ● Mercurial ● GIT ○ GitLab ○ GitoLite Backup ● rsync ● BackupPC ● Bacula FTP ● ProFTPd ● VSFTPD File sharing ● NFS ● SAMBA Control Panel ● Direct Admin ● Webmin+Virtualmin ● CPanel ● ISP-config ● Plesk Automatization ● Puppet ● Saltstack Monitoring ● Zabbix ● Nagios ● Munin ● Monit Network Understanding of theoretical and practical foundations of the networks (Data link, Network, Transport, Application Layers). VPN ● OpenVPN ● PPTP Database (SQL) ● MySQL (+MariaDB, +Percona) ● PostgreSQL Database (NoSQL) ● ElasticSearch ● Riak ● MongoDB ● Cassandra ● Redis Virtualization & Containerization ● KVM ● XEN ● OpenVZ ● LXC ● Docker ● Vagrant Cluster ● DRBD ○ master-slave ○ master-master (+ocfs2) ● Heartbeat ● Pacemaker Development ● actively use: ○ shell (bash, sh) ○ Python ● Frameworks ○ Django ○ Flask ○ Twisted ○ Tornado Cloud Solutions: ● AWS (EC2, S3, CloudFront, Route53) ● DigitalOcean ● RackSpace

    $33.33 /hr
    45 hours
    5.00
  5. Abhrodip P.

    Abhrodip P.

    Expert developer with Java, Flex, J2EE, AIR, MySQL, SQl Server 2005, M

    India - Tests: 3 - Portfolio: 1

    1. Total 8+ years of experience in Software Design and Development 2. Expertise in development of web based, client/server and Rich internet applications, Desktop application, Automation tools. 3. Good Deployment Knowledge. Strong in Maven. 5. Domain: CRM [HealthCare & Medical Insurance], Cloud Computing, 6. e-Commerce, Financial Services, Media and Information Services 6. Except coding I am also an active user of stackoverflow(http://stackoverflow.com/users/2325987/a-paul). I help other developers to solve the technical problems they are facing. Expertise in Java, Flex, HTML5, J2EE, Marklogic, MySQL, J2EE, Javascript

    $22.22 /hr
    3,979 hours
    4.99
  6. Parama D.

    Parama D.

    .NET, C#, ASP.Net, ASP.Net MVC, Android, iOs Developer

    Indonesia - Tests: 3

    Over the years, I have developed a wide variety of product from basic personal website, to a large scale company management system. My main core of skill set are on software design, OOP, .NET framework, SQL, Android and IOS development and also have good experience in the following areas such as PHP (with or without framework) On my spare time, I've also built couple of mobile application one of them with gamification concept, running on multiple platforms, which successfully used in one of the largest airline company.

    $15.00 /hr
    78 hours
    5.00
  7. Konstantin K.

    Konstantin K.

    QA Engineer

    Russia - Tests: 3 - Portfolio: 4

    "Think like a bug, act like a bug, and you will find a bug!" I'm experience with emphasis on Quality Assurance(Manual & Automation testing) with Web based, Client/Server and Standalone applications using tools like SOUP UI, Fitnesse and Selenium WebDriver with strong businesses understanding knowledge. Well versed with QA standards and methodologies and hands-on knowledge of all phases of the Software Development Life Cycle (SDLC). I have some facts which end your search and start your smiles,because you found a required specialist.. • Expertise in creating Test Plans, Test Scenarios and Test cases. Analysis of software documentation from business, technical and functional Requirement. • Experience in Functional testing, Integration testing, System testing, Regression testing, User Acceptance, Black box testing, UI testing, browser compatibility testing, Performance testing in different stages of SDLC. • Expert in Automation regression testing using Fitnesse, Selenium WebDriver. Creating, updating and executing the scripts and tracking the defects, Logging the defects and reporting the defect (bug). • Analysis of testing documentation and requirements with specifying comments for correction. • Strong SQL knowledge for test data verification. • Involved in Estimation Management of efforts of the testing process. • A good team player with excellent time management skills having profound insight to determine priorities, schedule work and management of testing team.

    $14.44 /hr
    441 hours
    5.00
  8. Naresh Holla

    Naresh Holla

    Expert Designer Developer

    India - Tests: 3

    I have total of 11 + years of experience in development of software. My core compentencies are in the windows application development using VC++ both 6.0 and VC++ 10, C# .net winforms in VS 2008, VB 6.0. This involves design and development of DLLs, EXEs, COM DLLs, ActiveX Controls and so. I have used SQL server extensively and wellversed in the development of stored procedures triggers, creating tables and views and several other DB operations. Also, I have a short development experience in ASP and an application hosted on IIS 6.0. In short I have the working knowledge of variety of window technologies and organizing and deploying them in different environments. Along with these experiences, I have acquired, quality assurance experience in which I was involved in entire life cycle product development as SQA associate about an year. This experience showed the insight from beggining of development, until the end of the release, going through conducting reviews at each stage of the release, verifying and certifying the deliverables with CMM maturity standards that organization set and at the end releasing the Project. At present, since 3 years, I am involved the product development and maintainance in my present company where we take care of entire bug fixing, enhancement, multiple integration with peer products and their maintainance, client interaction and differenent stake holders interaction and so on.

    $33.33 /hr
    453 hours
    5.00
  9. Marc Thompson

    Marc Thompson

    Unit Game Development Specialist

    United Kingdom - Portfolio: 2

    I have worked in the software industry for 10+ years. I have worked as a game developer for some of the leading games companies. Games are my passion, and so much so that I spend much of my working hours making games for Android devices. I have also worked in software outside of the gaming industry. This includes working as a contractor for companies supplying software solutions to the petrochemical and energy trading industries. I provide a professional service, aiding the client from project conception and initial design, right through to timely completion of development and finally to testing and debugging. My clients can expect a service of the highest standard, using all available resources to take your project to a timely completion.

    $25.00 /hr
    75 hours
    4.95
  10. Hassan Khan

    Hassan Khan

    Senior DBA and Application Developer

    Pakistan - Tests: 9 - Portfolio: 4

     Versatile and accomplished management professional offering over 9 years of experience in database and application server administration, and application development across various industries.  Proficient in Oracle Developer 4.5/ 2000/ 6i/ 10g, Access, VBA, Crystal Reports with Oracle, SQL Server, Access Databases on huge networked installations consisting of AIX, and Windows servers.  Recognised for hands-on experience in installing and testing new versions of the database management system and maintaining data standards, including adherence to the Data Protection Act.  Strong working knowledge of controlling access permissions and privileges; developing, managing, and testing back-up and recovery plans, and ensuring correct functioning of storage, archiving, back-up, and recovery procedures.  Showcasing exceptional organisational, multi-tasking, and analytical skills leading to effective operational excellence and communicating regularly with technical, applications and operational staff to ensure database integrity and security.  Adept at commissioning and installing new applications and customising existing applications in order to match them appropriately; and working closely with IT project managers, database programmers, and web developers.  Strong expertise in leading application development teams and administration and tuning of Oracle Databases including Container Terminal Management System, Core Banking, Oracle Financials, HRMS, Treasury, AML, KYC, Siebel, and Knowledge Manager.  Skilled initiator of successful strategies ensuring effective operational excellence and improved work ethic, culture, and performance. Received Appreciation letter from the CEO of Karachi International Container Terminal for successfully implementation of CARe project.  Excellent communicator and a top negotiator with an ability to work under pressure in fast-paced, time-sensitive environments. Proven ability to effectively interact with people of diverse nationalities; comfortable working in a multicultural setting.

    $16.67 /hr
    116 hours
    4.94