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Last updated: October 1, 2015

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Jorge Lopez

Jorge Lopez

Ethical Hacker and Digital Forensic Investigator

Mexico - Tests: 4

For the past seven years, I have been learning about the information security world, working as an CEH (Certified Ethical Hacker). With some of my co-workers, i have participated in a lot of projects, strictly focused on Information Security. Also, as we evolve and grow in this area, we have trained ourselves in Forensics Sciences, attending clients who need to know what happened after a contingency. I consider myself a self-taught person that likes to grow and that is not afraid of challenges or difficult cases. At this moment my priority is to teach and so much to share the little knowledge I have gained over the years, as well as learn from those who have traveled a different path and with this keep on growing.

$111.11 /hr
0 hours

Andrei Volkov

Andrei Volkov Agency Contractor

Linux specialist (Sec/Opt/Dev, C/Perl/Python/PHP/BASH)

Belarus - Tests: 5 - Portfolio: 13

Important: ------------------- Enhanced shield of your Web application with mod_security! Should be always. It is task #1 after installation ANY web application! ------------------- About Me and more: ------------------- I have over 16 years of work experience with Linux systems. This is the list of software and technologies with which I deal. This list is not full and expands day by day. I always can find right decisions if I found some problems. And I am always interested in looking for mostly economical and productive solutions. Of course, Cpanel, WHM, Webmin, Plesk .... I know how are working these web-wrappers and I support their. I can will tune and to make the checking of these wrappers. But that more important !! I can work without this))) Directly use configuration files of services and etc etc. Usually, it is better way on dedicated servers. ) TCP, IPv4 , IPv6, IPX ... - WiFi, WEP, WPA, WPA2 ... - SElinux, Apparmor, Smack, Tomoyo ... - LAMP ( Apache, Nginx, PHP, Perl, Mysql, Mongo), REDMINE ... - Cpanel, Zpanel, ISP ... - MySQL clustering and replication DNS servers ... - SENDMAIL, EXIM, POSTFIX (POSTFIXADMIN,MYSQL,DOVECOT,POLICYD) ... - HPC system: Torque, Maui, Moab for HPC clusters, Infiniband, FC interconnect, iSCSI, SCST, DRBD, OFED, OPENMPI ... - OpenLDAP ... - VPN with OpenVPN, PPTP, StrongVPN ... - Nagios, Zabbix, Ganglia, OSSEC ... - SVN, CVS, GIT ... - KVM, Xen, OpenStack, Proxmox ... - NBD, RAID, LVM ... etc etc During these years I have been in a large number of tasks related to administration of network devices, as well as with simple and complex server systems. I manage servers for the HPC tasks and for network infrastructure of Internet and Intranet - DNS,DHCP,*FTP,HTTP(S),MAIL etc etc. The main goals - the monitoring of the performance and the security. I also implement tasks of data backup and troubleshooting, support for the users. I have comprehensive work skills with systems based on Debian, Redhat, CentOS, SLES, OpenSuse. I've got more than 8 years of experience in developing the different software with use of C, Perl, Python, Bash, HTML on system and user levels. For example, very important skill in developing and the modification of RPM packages (rpmbuild, rebuild, kernels), custom kernels and etc etc. ------------------- Often: ------------------- How the standart service for VPS's and VDS's projects and dedicated servers: IDS, IPS, the control of contents of log's files, the control of load of the cpu, the memory, the hard disks; the backups of the databases and the files; install or update software, consultations. Emergency call via sms to cell phone. ------------------- STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. VERY OFFTEN: IF YOURS WP WAS HACKED 1. disable plugins 2. execute # diff -r dir1 dir2 3. repeat for plugins if you have last version of WP code: ~ 80% cases - problems: plugin low quality (look on author: from where and who is) ~ 15% cases - problems: theme low quality (look on author: from where and who is) ~ 5% 0day of WP also you need disable all shell function in php and enable suphp/suexec modes. STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. I am getting a lot questions about reliability and quality distributives/clones Ubuntu. Results on practice - Ubuntu clones - worst for server. It is truth. If you $buntu guy, I can't help you right now. I only can recommend Debian way for server. =============== 3. Nginx of course is good program. For small/middle vps. But in serious projects - apache. Nginx will be suitable for frontend. It is only practice. Always for all web application should be mod_security module. Firewall of level of web application on 7 level of OSI. Each web application/site should be under own user in environment of vps or on dedicated servers. =============== 4. By topic Wordpress. For optimisation services of OS , namely system IO(type of disks or partitions) and DB(type of engines of tables), need to use empty installation (default variants). Most problems of work WP contains in itself - customized plugins or themes. For analyze pages need begin with such services as =============== Sunday - day of rest. Or in emergency case - payment with double rate. best regards, Andrei / PS: With love from USSR. ;-)

Associated with: UPWORK.LINK

100% Job Success
$16.00 /hr
1,023 hours

Dmitri Chinberg

Dmitri Chinberg

Software developer

Netherlands - Tests: 6 - Portfolio: 6

Developing desktop and web applications using mostly c#/.net and sometimes ubot studio, winautomation, selenium framework, imacros. Developing cryptocurrencies(like bitcoin or litecoin). Successfully cloned bitcoin sha-256 and litecoin scrypt cryptocurrencies, set up mining pool software (MPOS) and more. Accomplished text parsing jobs, web parsers and scrapers, data mining and processing solutions, text processing solutions, form submitters, website views increasers, event trackers, database/client management solutions, video and audio processing and converting tools, cryptocoins and more. Fast turnaround time and high quality are guaranteed.

94% Job Success
$40.00 /hr
138 hours

Sergii A.

Sergii A.

iOS Mobile Applications Developer, Architect, iOS/API Consultant

Ukraine - Tests: 9 - Portfolio: 30

To be an Expert in mobile development means to understand all the problems of the clients and find the best way to solve it with high quality. + More then 9 years of Engineer Experience, Architecture/API design + More then 5 years of Team and Development Process building experience + More then 4 years of Mobile experience + CEO and CTO + Successfully completed 24 mobile projects in the last 4 years + Mobile platforms practical knowledge (iOS, Android) + Managing teams (local and remote) and projects from scratch I mainly interested in long term relationship with my clients; enterprise and business level applications with emphasis on quality, good user experience, pixel perfect UI, security and stability. Will improve development processes in your teams through meetings, code review sessions, task management and code management, automate application complex building/deploying and other day-to-day tasks. Worked with big financial, e-comerce, business players to improve their development process and help to convert their ideas into implementation. MY CLIENTS: - Philips Ukraine ( - Ciklum UK Ltd ( - BörseGo AG ( - Westwing Home & Living GmbH ( - Eat W.L.L ( - Welppeper Inc. ( - Play Golf Planet Inc. ( - Fieldfolio Pty Ltd ( - RooM the Agency (https:// - Search Concepts AG ( - MEMIDIS Pharma ( - Daylene Christensen ( - G7 Research LLC ( - Royal Brompton & Harefield NHS Foundation Trust ( - Biruza Software ( - Qbix ( - Salepads AB ( - QCM France ( - M3W Inc. ( PORTFOLIO: SERVICES: - iOS/Android/Tablet/Watch applications and game development - Code review and bug-fixing for your projects - Consulting about better mobile practices, user interface practices, Apple App Store application submittion process, iTunes Connect account/applications management, TestFlight and beta testing, architecture design; contribute ideas for making your application(s) better and easier to use; keen eye for detail - Project management, continuos integration, unit-testing for your projects - Review and perform a technical analysis of requirements - Produce a solid, detailed technical design, write clean, modular, robust code to implement the desired requirements - Regular report of project status with relevant deliverables EXPERIENCE: - iOS versions 4.3 - 9.x, iPhone/iPad/iWatch applications, application Localization - Continuous Integration for big companies (auto build, auto documentation generation, configuration management, Jenkins, MonkeyTalk test cases, Appium, AmazonInsigts for A/B testing, etc) - Storyboards/xibs interface, MRR or ARC projects - JIRA, Confluence, JIRAConnect, Git, Svn, Jenkins, Ant - CocoaPods, TestFlight, SDWebImage/FastImageCache/TMCache - Web services integration (SOAP, REST, JSON, XML, XMLRPC), RSS, RestKit, AFNetworking - Social networks integration (Twitter, Facebook, LinkedIn, Thumblr,...) - Integration with data storages (iCloud, DropBox, - Push Notifications, Local Notifications, Events, UrbanAirship - Cocos2D and Kobold2D game engines - CoreAudio, CoreAnimation, Audio/Video streaming, QuickLook, QuartzCore, AddressBook - SQLite and CoreData, external storages, Amazon S3 - InApp Purchases, Paypal, E-commerce - Bar code and QR codes: RedLaser, ZBar - Advertisements: iAd Network, RevMob, MoPub, Google AdMob, Adwirl, TapJoy, Chartboost - Statistics: Google Analytics, Flurry Analytics, Localytics, TradeMob, AdXTracking, Google Conversion Tracking, Google Tag Manager, Google Universal Analytics - Image processing, OpenCV, Augment Reality - CoreLocation for navigation, efficient GPS regions monitoring, geoloqi - Apple App Store experience with publishing aps - Route-Me Offline maps and Google Maps API (MapKit), Foursquare - ; ... a lot more

Groups: Application Developers Alliance

100% Job Success
$44.44 /hr
1,101 hours

Kanza B.

Kanza B.

administrator of Computer Networking and Information Systems Security

Morocco - Tests: 2 - Portfolio: 1

2012-2014 : Master Degree in Information Systems Security 2011-2012 : Bachelor Degree in Sciences of Networking & Telecommunication 2009-2011 : Degree at University of Technologies in Networks As I have a diverse experience in Network and System Administration, particularly with the Cisco , I would be able to contribute effectively to your bottom line. I have a special expertise in network design and security, devices implementation, users training and network maintenance on day-to-day basis. Owing my relevant qualifications and skills, I can offer you reduced overheads and expenditures by procuring most efficient and economical devices and utilizing limited resources efficiently.

76% Job Success
$5.56 /hr
22 hours

Youssef M.

Youssef M.

Senior Software Engineer, Data Warehouse Specialist, Technical Writer

Egypt - Tests: 5 - Portfolio: 7

Over the last 9 years, I have been developing software applications in different domains like desktop applications for small businesses and websites for different applications. I have experience in the following areas: Object oriented design, design patterns, software architecture, JAVA, C/C++, C#, ASP.NET, PHP, Zend, MySQL, MSSQL, jQuery and others. My core edge lies in applying my experience and skills to develop software solutions that satisfy various client's needs and to establish solid relationships with my clients.

96% Job Success
$16.67 /hr
1,411 hours