Top Upwork Freelancers

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  1. Liam Zdenek

    Liam Zdenek

    Consultant - Optimization - Security - PHP - MySQL - Linux

    United States - Last active: 24 days ago - Tests: 9 - Portfolio: 8

    I have notable experience and expertise optimizing web applications, and was instrumental in designing and optimizing a website that was in the top 50 websites with millions of hits every hour. I have worked on the entire stack: everything from front-end javascript, to backend applications written in PHP, Node.js, or Golang. See my oDesk Tests section. I have achieved, among others: * PHP: First Place * Javascript: Top 20% * Unix: Top 10% * Perl: Top 30% I specifically have experience with: * PHP (including Yii, Slim, Silex, and Symfony) * Golang * MySQL/PostgreSQL, including optimization * Redis, MongoDB, and other NoSQL databases * Linux (as both a desktop and a server) * Advertising * Video Streaming * Imagemagick (image compositing and effects) * eCommerce * Paypal, FedEx, Authorize.net, and other third party APIs * Biological data (Fasta, Uniprot, PDB, etc.)

    $120.00 /hr
    829 hours
    5.00
  2. Ivana Nykina

    Ivana Nykina

    Market analysis, qualitative research, marketing plan.

    Russia - Last active: 5 days ago - Tests: 2

    Marketing professional with extensive experience in market research both online and offline. Consumer insights expert specializing in qualitative research and product development research, market analysis, marketing strategy. Deep expertise in understanding of Russian consumer market and how businesses can tap directly into their habits, aspirations and attitudes. Have a strong experience in managing cross-cultural research projects within customer and product development services. Passionate about providing high quality, cutting edge qualitative research in a tight deadline.

    $35.00 /hr
    83 hours
    5.00
  3. Álvaro Carballo García

    Álvaro Carballo García

    Senior Programmer & Numerical Modeller

    Spain - Last active: 12 days ago - Tests: 4

    My name is Alvaro (nickname: varocarbas) and I am a senior programmer (+7 years), who has participated in a wide variety of projects involving custom software development and numerical modelling. I have recently reopened my 1-person company: Custom Solvers 2.0. My favourite programming languages are: - Desktop-based: C# & VB.NET (mainly Winforms); VBA (MS Office Macros) & VB6; Java and other C-based languages; FORTRAN. - Web-based: PHP & JavaScript; ASP.NET (C# & VB.NET). Customsolvers.com 2.0 references: - About me (varocarbas): http://customsolvers.com/en/pages/varocarbas_com/local/about/. - About Custom Solvers 2.0: http://customsolvers.com/en/pages/company/basic_information/. - Principles: http://customsolvers.com/en/pages/company/principles/. Mainly interested in fixed-price projects over $1000. NOTE: this was one of the freelancer-network profiles (although not precisely the most important one) which was associated with the previous version of my 1-person company (trendingIT/Custom Solvers). In 2015, I tried to create a new profile for Custom Solvers 2.0, but UpWork didn't allow me to do so (even though I proposed them different alternatives, logically by avoiding the deletion of this old account. And I certainly don't like unreasonable inflexibility...). In summary: Custom Solvers 2.0 will also be using this profile.

    $50.00 /hr
    76 hours
    4.97
  4. Bruno Martins

    Bruno Martins

    Senior Android Developer

    Norway - Last active: 25 days ago - Tests: 9 - Portfolio: 2

    Very motivated and determined young man with a taste for Science. Most of my career focus as been on Android Development. I have a lot of experience working for major international corporations and building serious, solid apps for big commercial purposes. Main Skills : - Android SDK & NDK - JAVA and Java Native Interface ( C / C++ ) - PHP, Mysql, JavaScript, Jquery, Doctrine, Zend Framework. - iOS SDK I'm looking for good business relations and partnerships and work together to build good, solid and efficient applications.

    $55.56 /hr
    701 hours
    5.00
  5. Kirill Schirinkin

    Kirill Schirinkin

    DevOps Engineer and Backend Developer

    Russia - Last active: 4 days ago - Tests: 2

    Started as fullstack Ruby on Rails developer, in last 6 years I've developed my skills from backend all the way to architecting complex systems, which involve usage of cloud platforms, data pipelines, configuration management etc. etc. I've worked both with small scale startups and with big high load business and now how to pick and use best tools for the job. I can rapidly design and implement a product from scratch or significantly improve existing code bases and infrastructures. Be aware - currently taking only short term (few months at most) and complex and interesting contracts.

    $100.00 /hr
    118 hours
    5.00
  6. Vilen M.

    Vilen M.

    Senior Software Engineer

    Armenia - Last active: 4 days ago - Tests: 6 - Portfolio: 10

    An agile and ambitious software engineer with strong technical background who possesses self-discipline, hardworking, quick learning, good team spirit and honesty. My experience include web programming both front-end and back-end, development of interactive web application, desktop and mobile applications, use of modern technologies, databases and much more. In software development process I tend to maximize attention to details and efficiency. With help of proven frameworks, UML tools, diagrams, design patterns and SDLC concepts I keep enhanced control over development process and ensure that quality solutions meet business objectives.

    $35.00 /hr
    1,174 hours
    5.00
  7. Oleksandr Tomilin

    Oleksandr Tomilin

    CEO of Reprezent

    Ukraine - Last active: 1 day ago - Tests: 2

    My name is Alex, I am a CEO of Reprezent presentation design company based in Ukraine. My company provides affordable and great-looking presentation design in Prezi or Powerpoint, presentation consultancy and education. We, as a team of visual storytellers, are here to show your transformative ideas and tell your story to the outside world. You'll get beautiful looking and stylish presentation for an affordable price within the fast turnaround time. My company worked with big international companies, Start ups, speakers of TEDx events. For 90% percent of our clients the presentation was delivered faster than expected with the design which exceeded their expectations. Contact me and we will apply our creativity in order to show your story and WOW your audience!

    $30.00 /hr
    96 hours
    4.96
  8. Cristian S.

    Cristian S.

    Front-end & Full stack developer, Ruby on rails, Javascript & EmberJS

    Spain - Last active: 9 days ago - Tests: 5 - Portfolio: 4

    For the last 12 years I developed sites for Fortune500 companies and technology startups. I've got 20 years of experience in web development, leading teams using agile methodology, scaling web applications with heavy traffic and maintaining big codebases. My best skills are on UI, UX Design and Front-end development but I consider myself a Full-stack developer capable to take on every corner of a project. Today I am building sites with Ruby on rails, Saass, Coffescript, EmberJS and MySQL, with a focus on real time and automated behaviours. I also build IOS and Android apps with Rubymotion. I like Git, write tests and deploy to cloud based enviroments such as Heroku, AWS or dedicated web servers.

    $50.00 /hr
    110 hours
    5.00
  9. Sergey Golovchenko

    Sergey Golovchenko

    DevOps/System/network administrator

    Ukraine - Last active: 1 day ago - Tests: 4

    My goal is providing only hight quality service. If you have any IT task - ask me, and I'll provide complex solution. Filed of my expierence covers, but not limited to: OS: varios Linux (Ubuntu/Debian/CentOS and other), FreeBSD SCM: Puppet Web servers: Apache, Nginx Database servers: Mysql and clones, Postgresql Monitoring: Nagios, Zabbix (preffered),Cacti Virtualization: Openvz, XEN and XenServer, KVM Cloud services: AWS, Rackspace Scripting: bash, python. Mail servers: postfix, dovecot, exim, sendmail and many others Networking: standard network services (DNS, DHCP, Samba, SVN/Git, http proxy, jabber, VPN, backups, monitoring etc), firewalls and routers (iptables, iproute, VLAN, bridging, bonding, BGP, OSPF), different hardware (Cisco, Extreme networks, mikrotik and many other) PS: This list isn't full, as long lists looks ugly :) Also I'm very interesting in development/DevOps task's, especially python development.

    $55.56 /hr
    211 hours
    5.00
  10. Alex D.

    Alex D.

    Network / Security / VoIP / Unix Specialist

    Russia - Last active: 1 day ago - Tests: 6

    15+ year experience in networking. Built an ISP (Internet Service Provider) from scratch. Network Planning, Designing, Implementing and Optimizing. Right now we have about 4500 customers. We use Wireless & Fiber technologies. I do WISP and ISP consulting. I specialize on the following products: *** HP (mainly ProCurve switches family and rack servers) *** D-Link (layer 2 & 3 manageable switches) *** Ubiquiti (AirMax, Unifi, mFi & AirFiber products) *** Mikrotik (CCR series, wired & wireless RouterBoard series, x86 RouterOS) *** Grandstream (VoIP PBX, Phones, Gateways and ATAs) *** Linksys (VoIP products) *** Cisco (VoIP products and Catalyst series) *** DELL (SonicWall series) *** Draytek (Network & VoIP series) *** Other products: Linux, Mac OS X, Windows, vmware ESXi, Asterisk, FreePBX I have a good knowledge of the following technologies: TCP/IP, IPv4, Static & Dynamic routing, BGP, EIGRP, OSPF, Layer 2 & Layer 3 VPNs, IPSec, NAT, PAT, STP, VLAN, QinQ, GVRP, HSRP, VRRP, RSTP, MSTP, VTP, RDP, Firewall, Remote Access, HTTP, Load balancing, QoS, CoS, OpenVPN. Check out tests I've passed. I'm new to oDesk, thats why my hourly rate is low now :-) I'm ready for a test task.

    $34.99 /hr
    50 hours
    5.00