Ivan Voras

Ivan Voras

Zagreb, Croatia
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Ivan Voras

Ivan Voras

Zagreb, Croatia
Member since June 18, 2014
Ivan is primarily a back-end developer with 10+ years of experience in architecting and implementing server-side solutions, including non-web-related distributed platforms such as Bitcoin, chat servers, and general client-server solutions. He has handled DBA operations, developed modules for PostgreSQL, operating system kernel modules (FreeBSD), and new algorithms. He is interested in general client-server problems and distributed apps.
Ivan is now available for hire
Portfolio
Experience
  • C, 8 years
  • Python, 7 years
  • FreeBSD, 8 years
  • PostgreSQL, 10 years
  • DBA, 8 years
  • Database Design, 10 years
  • System Architecture, 5 years
Zagreb, Croatia
Availability
Part-time
Preferred Environment
Linux, Vim, GCC, Eclipse, Git, Go
The most amazing...
...thing I've developed is a Bitcoin fork.
Employment
  • Developer
    Ideja na kvadrat (Self-employed)
    2015 - PRESENT
    • Developed back-end for a Bitcoin tool.
    • Handled DBA and DevOps for both large companies and startups.
    Technologies: C, Go, Python, PostgreSQL
  • Kernel Developer
    FreeBSD
    2007 - PRESENT
    • Wrote kernel-side code.
    • Designed and implemented a device-level journaling module.
    • Designed and implemented a virtual storage module.
    • Gave talks at annual FreeBSD conferences.
    • Participated in the vibrant international community of users and developers.
    Technologies: C
  • Open Source Developer
    Freelance
    2000 - PRESENT
    • Authored dozens of open source projects, including applications and libraries.
    • Created a high performance memory cache server that was faster and had more features than Memcached (http://sourceforge.net/projects/mdcached/).
    • Built a module for PostgreSQL (written in C) to extend the full-text-search facility with support for the Croatian language (https://bitbucket.org/ivoras/pgdict_hrsufx).
    • Developed a module for PostgreSQL (written in C) to support on-the-fly encryption of common data types (https://bitbucket.org/ivoras/pgenctypes/).
    • Created a client-side public key encryption module in JavaScript and PHP for secure user authentication without SSL (https://bitbucket.org/ivoras/rsalogin/).
    • Developed a fixed-point header library in C for environments without floating point support (e.g. embedded) (http://sourceforge.net/projects/fixedptc/).
    • Created an encrypted notepad app for desktop and Android for editing and directly saving encrypted files (http://sourceforge.net/projects/enotes/).
    • Updated a blog regularly at http://ivoras.net/blog/tree/.
    Technologies: C, C++, Python, PHP, Java
  • Internet Services Architect
    University of Zagreb
    2001 - 2015
    • Designed and implemented the core of a web content management system back when they were a new concept (2001-2002).
    • Worked as a technology and product architect.
    • Designed a very modular web application framework.
    • Designed and optimized the design of the database to include recent PostgreSQL features.
    • Designed and implemented the server-side environment based on FreeBSD for high performance and uptime.
    • Spearheaded the implementation of new technologies into existing products and processes.
    • Completed a PhD in efficient multithreaded client-server architecture.
    Technologies: PHP, PostgreSQL
Experience
  • Encrypted Notepad (Development)
    http://sourceforge.net/projects/enotes/

    A desktop application and an Android application for editing and saving encrypted text files.

  • Bullet Cache (Development)

    A memory cache server faster than Memcached (in its timeframe) and with more features, such as cache record tagging and tagged expiry. It also has more flexible operations on multiple cached items.

  • Needle Search Server (Development)
    https://bitbucket.org/ivoras/needle

    A very fast and streamlined full text search server using Google's LevelDB for storage. It acts as a pure REST server over FastCGI and is implemented completely in C++.

  • My Electronics Blog (Other amazing things)
    http://ivoras-electronics.tumblr.com/

    Since late 2015, I've been doing increasing amount of work with Arduinos and similar-style electronics. I've created a blog to share what I've learned and to learn from the comments!

    I'm currently interested in low-power design and solar power.

  • Guide to Multi-processing Network Server Models (Publication)
    In this article, Toptal engineer Ivan Voras provides a useful overview and comparison of multi-processing network server models, with the goal being to take some of the mystery out of writing high performance networking code. The article is intended for "system programmers", i.e., back-end developers who will work with the low-level details of their applications, implementing network server code.
  • Software Development Anywhere: My Distributed Remote Workplace (Publication)
    Working as a remote software development freelancer has many benefits, but setting up an effective distributed working environment can be a real challenge. In this article, Toptal Engineer Ivan Voras describes how he leverages SSH and a number of related technologies, along with the Raspberry Pi and ownCloud, to be able to work effectively from anywhere.
  • Installing Django on IIS: A Step-by-Step Tutorial (Publication)
    Although the most wide-spread and supported way of running Django is on a Linux system (e.g., with uwsgi and nginx), it actually doesn't take much work to get it to run on IIS. In this article, Toptal Engineer Ivan Voras walks you through a step-by-step tutorial, clearly explaining how to install Django on IIS.
Skills
  • Languages
    SQL, C, Python, Regex, PHP, PL/pgSQL, Java, C++, JavaScript, Go, Object Pascal, Stored Procedure, Pascal
  • Frameworks
    Django, Bootstrap, Knockout.js, Bootstrap 3.0, Flask, Boost C++, Android SDK, Twitter Bootstrap
  • Libraries/APIs
    SQLite, Sockets, JSON REST API, POSIX, HTTP API, Lazarus, LibC, Masonry, jQuery, Social APIs, Pygame, FFmpeg, Puppet.js, cURL, SDL, PyGTK, Google API, pcap, ZeroMQ, WebSockets, Java Security, ODBC, Python Imaging Library
  • Tools
    Ansible, PuTTY, Apache, SQL Prompt, Mercurial, Nginx, Vim, KVM/Qemu, GitHub, Django-admin-tools, Subversion, VirtualBox, Trac, Git, Postfix, MediaWiki, Eclipse IDE, HSQLDB, Asana, Markdown, Virtualenv, Notepad++, VPN, GCC, Trello, Eclipse
  • Platforms
    Unix, FreeBSD, LAMP, CentOS, Ubuntu, Linux, BSD, Raspberry Pi, CentOS 6, Debian Linux, Win32, Arduino, Amazon Web Services (AWS), Django CMS, WinNT, Embedded, Raspbian, Xen, Android, Java SE
  • Storage
    Database Performance, FlatFile, Cache, Memcached, PostgreSQL, DBA, MySQL, Database Modeling, LevelDB, NoSQL, smbd, DB, Redis, Apache Derby, Cassandra, MongoDB, Berkeley DB, CouchDB, LVM, Firebird, Internal Database, MySQL daemon, SQL Performance
  • Misc
    Memory Mapped Files, Bitcoind, Back-end Development, HTTP, SSL, System Architecture, Open Source, SSH, Database Design, System Administration, Linux CentOS, SMTP, Site Speed Optimization, Multithreading, SFTP, Debian GNU/Linux, Linux (RHEL CentOS), Linux redhat, Unix/Linux Virtualization, TCP/IP, Kubuntu Linux, BitBucket, Bitcoin, RSync, FTP, Ubuntu Linux, Data Structures, HTTP Server, Regular Expressions, Hash, RESTful, iSCSI, Writing, Documentation Writing, Distributed File Systems, Cryptography, Ethernet, Networks, Web Services, UDP, Encryption, TCP, NFS, Version Control, Kernel programming, System Design, Public-key cryptography, Database Replication, Genetic algorithms, Architecture, RPC, LocalStorage, Algorithms, Keychain, JSON, High-performance computing, Embedded systems, Electrical Engineering, Cloud, Memory profiling, Social Network Integration, SSO, Protocol Buffers, RSA, OAuth, CRUD, Peer-to-Peer networking, Martini, Bluetooth, Software Architecture, Unix Shell Scripts, AES, Apache Cassandra, GNU/Linux, IMAP
  • Paradigms
    DevOps, Socket programming, Network programming, REST, Concurrent Programming, Object-oriented Programming (OOP), Real-time systems, Functional programming, Object-oriented Design (OOD), Cloud Development, Back-end Architecture, Refactoring, Clean Code, Lean Development, Prototyping, Data-driven Programming, AJAX
Education
  • PhD degree in Computer Engineering
    University of Zagreb - Croatia
    2006 - 2011
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