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Last updated: October 1, 2015
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Zhao Jingjing

Zhao Jingjing

Image Processing Expert, Mobile Developer


Over the last 10 years, i have developed a wide range of Computer Vision Programming including face detection, face recognition, gender recognition, age estimation, face express transform and object detection, tracking, etc. i also have some experience in following areas : Android, iPhone, website construction using PHP, JSP, Matlab, C#, VC++ Debugging

86% Job Success
$50.00 /hr
3 hours

Vitalii M.

Vitalii M.

Senior Software Developer / Technical Lead

Canada - Tests: 20 - Portfolio: 2

NOTE: As I am full-time employed, I am NOT available for full-time projects or projects that require my participation during my local business hours. My approximate regular availability for freelance projects is 10 to 15 hours weekly. ABOUT: I have been working as a software developer since 2001 and have deep knowledge of object-oriented analysis and design (OOAD) and programming (OOP), built by theoretical basics as well as by wide experience of design and development of databases, back-end applications, front-end desktop and Web applications for Windows. At different times, I was involved into design and development of Enterprise Resource Planning (ERP), Customer Relationship Management (CRM), Warehouse Management (WMS) and other systems.

100% Job Success
$85.00 /hr
438 hours

Roman B.

Roman B.

Experienced Web server and Unix system administrator

Russia - Tests: 3 - Portfolio: 4

I am a highly experienced Web and Linux System Administrator. I've been working for 14 years effectively on my chosen fields. I specialize in website administration, I can deal with managed and unmanaged website installations, I do website and database performance tuning, I setup and configure nginx, Apache and PHP for the best performance, I'm experienced with Wordpress, CakePHP, Drupal and other frameworks/CMS out there. I've setup a great deal of websites and made plenty of improvements, including load balancing, automatic backup plans, realtime performance monitoring, and multiple of website migrations (with zero downtime) . I'm very interested and currently seeking opportunities to participate in larger scale, high load, distributed web projects and services. I work with the following technologies: Linux: Debian, Ubuntu, Centos, other RedHat variants Server management: Plesk, CPanel, WHM Web Server: nginx, apache Application server: php-fpm Database: mysql, MariaDB, mysql replication Caching: memcache, nginx cache, frameworks caching extensions Virtualization: vserver, openVZ, lxc, KVM, VMWare, ProxMox Monitoring: pinba, Zabbix, AppDynamics Database Monitoring. Backup: R1Soft Idera Server Backup, rdiff-backup, duply, custom written scripts in bash/python Web frameworks/CMS: Wordpress, Drupal, symfony, CakePHP Audio/video streaming: shoutcast, icecast, Wowza, rtmp Linux tuning: sysctl, iptables, ... Coding scripts: shell/bash, python Delphi and Assembler coding skills, Windows desktop program writing skills. WinAPI knowledge. Reverse engineering skills: x86-64, Motorola 68HC12 family, PowerPC, Siemens C166 family, Java/Android decompilation.

100% Job Success
$30.00 /hr
691 hours

Haoyan J.

Haoyan J.

Mobile&Web Developer And Reverse Engineer

China - Tests: 11 - Portfolio: 6

I am an expert Mobile(iOS & ANDROID) developer having lot experience in Objective C and Cocoa Touch Framework for iOS 8.3 and Android 4.xx/5.xx 

I have worked extensively on the following technologies: 

- Core Location / GPS 
- MapKit 
- GeoLocations / Places API 
- AVFoundation API / Camera API
 - API Development and Integration to App 
- Facebook API, Twitter API, Youtube API, LinkedIn API Integration, FourSquare API
- iAds / AdMob / Mobclix / Flurry ... Integration
 - Designig User Interfaces / User Experience Engineering 
- Core Data / SQLite 
- Memory Management
 - Developing Custom Controls
 - CoreAnimation API / Animations 
- File Uploads 
- RSS And also I am a C++ expert. Specifically, I am an expert in reverse engineering. I have rich experiences in many reverse engineering tools like IDA pro. Thank you.

72% Job Success
$33.33 /hr
126 hours

Alexander Markov

Alexander Markov

Senior Software Security Engineer


Professional and passionate, with over 10+ years experience in Software engineering, Application security, Embedded devices security, Hardware hacking, Reverse Engineering, Penetration testing 1. Software: Full stack (web-) development in: Python, Java, Scala, C++, Assembler Javascript, JQuery, CSS, SQL 2. Application Security: architecture/design review, source code audit, threat modelling; engineering of security features into applications (authentication/authorisation, encryption, data handling) blackbox/white testing for common vulnerabilities (buffer overflow, integer overflow, format string, use after free, etc etc) and web exploits (csrf, xss, sql injection, dom injection, credential mismanagement etc) 3. Security: Penetration testing, vulnerability hunting and assessments, malware analysis, reverse engineering (x86, ARM, MIPS, mobile), PoC development. Please visit my LinkedIn profile for Employment history, links to my projects, conference talk and references.

$40.00 /hr
0 hours

Maxim Bulatov

Maxim Bulatov

System engineer and backend programmer

Russia - Tests: 2

I have five years programming experience after six years university education. And I know some about systems organization. My idol is Ken Richey, who is a great men and great engineer. Like him, I try to think more about "how it work" and "what I must do, if I want this system behavior". I can forgot about functions prototype or even language syntax, if didn't use it few months. But never about internal logic. And can use reference books as well. One from my general ability allow me consume unknown things with unknown technologies in a very short time. Because in a global scope it's usually very similar to anything, than I know. I had work in web studio as backend programmer, CRM-product support company as programmer, regional network provider company as network engineer , video software company as programmer. It all included short cycle developing, no more than five months per one project (it was old, not my own projects also). That is my negative attribute. My education profile sound as "Software for electronic system" + "Complex protection of information objects".

$16.00 /hr
6 hours

Jason Sanchez

Jason Sanchez Agency Contractor

Freelance Software Developer

United States - Tests: 5 - Portfolio: 3

Over the last ten years, I have gained personal experience with a broad diversity of technologies with the eventual interest of becoming self-employed and self-sufficient. I have worked as a freelance contractor, as a part of an established business, and as a part of academia in an effort to further expand my experience. I intend now to use the breadth of my abilities to offer clients superior advise on currently available technologies while retaining the flexibility to cope with shifting client needs. Having an end-to-end understanding of technologies, from the high-level web interface to the hardware the servers are made out of, enables me to provide high quality end- to-end support. Impossible problems just take more time to solve than usual.

Associated with: Drawersteak, LLC

$30.00 /hr
34 hours

Eduard Mishkurov

Eduard Mishkurov Agency Contractor

C/C++, DirectShow, Assembler 32/64, SIMD, CUDA, OpenCL

Russia - Tests: 5 - Portfolio: 11

Worked for Touchstone Software, Symantec, Acronis, Mobility Electronics, etc. Let my 20 years of software engineering experience work for you! * Strong knowledge in C/C++, STL, Boost; * Designing and developing cross-platform applications; * Author of a number of DirectShow codecs and transform filters; * Parallel programming. Well-qualified in MPI, Boost,Thread.

Associated with: EfmSoft

$30.00 /hr
77 hours

Michael Boulgackov

Michael Boulgackov

Pro Delphi software engineer with mathematics and assembler for speed

Russia - Tests: 5

My slogan: "careful understand a task, and make effective code". I'm working with *Delphi *SQL(prefer MySQL) *Mathematics/Algorithms, *Cryptography *Assembler for bottle-necks if needed In some case I can create fast bash- or perl- scripts for Linux OS to automate routines.

$22.22 /hr
0 hours