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Regular Expressions Upwork freelancers typically receive a client rating of 4.80.

Last updated: October 1, 2015

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Fernando R.

Fernando R.

Ruby on Rails Developer with Strong Linux Background

United States - Tests: 3 - Portfolio: 1

Very proficient RoR Web developer with a strong Linux/Unix background. Located in Florida, USA I work on EST timezone, allowed to work legally in the USA, I can attend to meetings, receive and make calls worldwide, as my customer you will be provided with a direct line to contact me if necessary. Over 11 years of experience on the IT industry, mainly working for major 500 Fortune US companies such as Cisco Systems, LexisNexis, Sun microsystems and others. My focus is always to keep things as simple as possible and make stuff better. Relevant skills : - Ruby on Rails 3 - , Credit card systems - RSpec , Capybara ( Testing ) TDD - Memcache - C ANSI - Linux / Unix (Solaris) - Shell scripting - Unix power tools: vi,awk,sed,bash,truss,top,strace,tcpdump,iptables.. - Capistrano - Amazon EC2 and Clouding computing. - VPS (Heroku, SliceHost, DreamHost) - Git Collaboration tools and extras that we offer to our customers : - US Phone number landline and cell phone - Skype. - Outlook Calendar (Exchange server) - EST U.S timezone, Located in Florida, near by major airport (FLL) - Fluent in English, Spanish and Portuguese (Spoken and Written) Don't hesitate to contact me if you have any questions.

$33.33 /hr
157 hours

Maxim Vershinin

Maxim Vershinin

Python, Django, Javascript, *nix, Networking

Russia - Tests: 2 - Portfolio: 2

5 years experience Python, PyQt4, Django, GAE, Flask, Javascript, Bootstrap, jQuery, ExtJS. Also as *nix admin, Squid, VPN ,Iptables, Postfix, KVM, mdadm, Bacula, Apache, ngnix, SSH, SMB, netflow, Zabbix. Wide experience in DB admin and programming: PgSQL, MSSQL, SQlite, Firebird.

100% Job Success
$16.67 /hr
248 hours

Daniel J.

Daniel J.

Senior Linux Systems Administrator

United States - Tests: 4 - Portfolio: 1

I am a Linux expert. I have been a linux user for 16 years and have used it professionally for 15 years. I was an early adopter of the Nginx web server and over the last 5 years I have been using it exclusively to manage high traffic web sites. I specialize in Linux security and have professional experience securing a web server using methods such-as but not limited to; chroot/jail environments, hardened kernel patches, and role-based access policies. I am an expert at tracking down even the most difficult of problems and most of my clients believe that I have a crystal ball under my desk. I am fluent in Python and PHP and can write everything from small scripts to automate tasks to a full blown command line application.

97% Job Success
$50.00 /hr
61 hours

Roman V.

Roman V.

Web developer

Russia - Tests: 12 - Portfolio: 12

Lately my work is about integrating Bitcoin-related functionality in websites or developing special purpose apps, like a bitcoin trading bot or a websocket chat. It involved various technologies: node.js, websockets, Ruby, Sinatra framework, API, PayPal API. During the years of my work prior to this I've performed a big variety of tasks in developing and reworking websites. This involved a lot of programming with PHP+MySQL, layout works with HTML+CSS, Javascript (with and without jQuery), AJAX. I had experience working with various CMSs: OpenCart, Joomla!, Wordpress, MODx Revolution, DataLife Engine, SimplaCMS, self-written websites. Also with different frameworks: MODx, Yii, also self-written MVC structures. I also use regular expressions (RegExp) fluently and have quite some experience with that. I've integrated a number of payment systems in several websites, which included PayPal, Bitcoin (native and via API) and russian WebMoney, Yandex.Money, QIWI, Robokassa. All payment processors utilize mainly same principles, so it's no problem to learn and integrate something new quickly. My work included creation of web grabbers and parsers that process information from external websites, for example to fill up an online store database. Also setting up and administrating Linux/FreeBSD VPS servers: installation and configuration of Apache, PHP, MySQL, Python and some other uncommon software. Aside from pure web, I've developed Python and Ruby scripts for various services. A part of that was developing Bitcoin-related services, including API communication with bitcoind daemon, automated receiving/sending Bitcoin payments, trading on BTC exchanges via their API, and other stuff. I'm looking for interesting work opportunities that would let me develop my skills and acquire new ones. Cryptocurrencies are especially interesting to me, but if it's not the case, no problem. Most likely I can be useful to solve your programming issues, so feel free to contact me.

100% Job Success
$40.00 /hr
476 hours

David B.

PHP/MySQL Developer Specializing in E-Commerce Platforms

United States - Tests: 9

Over the last 10 years, I have specialized in e-commerce. I got my start working on simple osCommerce installations. Since then, I have progressed to building and working with highly-customized and integrated platforms, becoming an expert in PHP/MySQL, HTACCESS, JavaScript, AJAX, jQuery, and XML. I have also had the opportunity to work extensively with many other frameworks and API's. I have a lot of experience with Google Adwords API, credit card and shipping interfaces, and numerous other external libraries. I enjoy challenge of optimizing applications for peak performance inventing new methods for automation, streamlining back-end operations, and providing custom analytics. I pride myself on being able to jump into a project quickly and to creatively solve nagging problems. Although I do have experience with HTML and CSS, I am in no way a designer. I am strictly a coder, and, simply put, I love my work. I have worked with over 180 clients on 275+ projects. Excellent communication skills and driven work ethic. I am a perfectionist, and I am not happy until the client is happy.

Groups: Application Developers Alliance

100% Job Success
$94.44 /hr
3,706 hours

Ilya Frolov

Ilya Frolov

System Administrator and Web Developer

Russia - Tests: 7 - Portfolio: 6

I am php/golang developer and linux system administrator. Have an interest in all kind of web based programming technology like php, python, perl, golang . I have ability to create software from abstracts and fundamental algorithm design to deploying on production servers and zooming in business. I am interesting in golang, open source, secure networking (SSL and so on), servers maintenance. Prefer full circle development - from idea to full production server support! I like to learn and follow the most modern technologies. I have 5+ year of shared web hosting design and service.

$16.67 /hr
145 hours

Max Chechel

Max Chechel

Backend programmer with NFC experience

Russia - Tests: 1 - Portfolio: 1

Hi, I've been working in IT since 2003. I have worked mostly as a backend programmer and system architect for several e-commerce and mobile commerce startups that are well known in Russia and the post-Soviet space: * * * For these projects I have used PHP, C, Java, MySQL, Linux, Memcached, regular expressions, XSLT, SOAP and many other things. Three years ago I moved into the NFC world and since then I've been developing innovative payment and ticketing NFC services for a start-up company. One service is already in use and allows passengers of Moscow's "AeroExpress" trains to use their PayPass/PayWave bank cards: I developed a distributed system that includes: * Multithreaded servers for each train station that manages dozens of NFC readers and turnstiles and processes transactions in pseudo-realtime mode with delayed transaction authentication. * A central server that provides back office interface for tech support and accountants, collects logs and other information from station servers, and distributes black and white lists of cards across all stations connected to the system. Sometime ago I made a few minor commits to an opensource LibNFC library that made it possible to use it to communicate between a NFC reader and Mifare-enabled USIM cards and dual interface contactless smart cards with mifare functionality. I started to use Ruby as a main programming language in 2008. I should note that my Ruby experience is quite different from a great majority of ruby programmers; I use Ruby not only for Rails but also for communicating with different types of hardware using binary TCP-based protocols or serial ports. Rails are used mostly for creating backoffices (ActiveAdmin) and API web-services.

$18.00 /hr
11 hours

Andrii Andriichuk

Andrii Andriichuk Agency Contractor

Software Engineer (.NET; WEB; SOA; WCF; SQL Server; Delphi)

Ukraine - Tests: 4 - Portfolio: 14

I am a professional software developer. I work in this field for more than ten years. During my career I developed a set of desktop and web applications. At the moment I completed a major project and for that reason I am looking for work new project. I will be glad to start to work with you. I am able design and implement such things as architecture, security, data access layer, db structure, bussiness layer, caching and much more. Also I have good experience in SOA. WCF SOAP an d WCF REST I can work with both without any problems. Please contact me if you need any help of experienced programmer.

Groups: Central Desktop, Twilio

Associated with: DYNAMIC DEVS

100% Job Success
$50.00 /hr
4,791 hours