Ivan Voras - Freelance C Developer for Hire

Developer

2015 - PRESENT

Ideja na kvadrat (Self-employed)

Developed back-end for a Bitcoin tool.
Handled DBA and DevOps for both large companies and startups.

Technologies: C, Go, Python, PostgreSQL

Kernel Developer

2007 - PRESENT

FreeBSD

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

2000 - PRESENT

Freelance

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

2001 - 2015

University of Zagreb

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

Daisy Blockchain (Development)

https://github.com/ivoras/daisy

A private blockchain where blocks are SQLite databases, in Go.

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 an 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)

https://www.toptal.com/software/guide-to-multi-processing-network-server-models

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)

https://www.toptal.com/remote/software-development-anywhere-my-distributed-remote-workplace

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)

https://www.toptal.com/django/installing-django-on-iis-a-step-by-step-tutorial

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.

Languages

Go, SQL, C, Python, PL/pgSQL, Regex, Java, Pascal, C++, Stored Procedure, JavaScript

Frameworks

Django, Knockout.js, Bootstrap, Flask, Boost C++, Android SDK

Tools

Ansible, PuTTY, Apache, Django-admin-tools, VirtualBox, SQL Prompt, Mercurial, Nginx, KVM/Qemu, Trac, Subversion (SVN), GitHub, BitBucket, Vim Text Editor, Virtualenv, Postfix, Notepad++, MediaWiki, HSQLDB, Git, cURL Command Line Tool, Trello, Asana, Eclipse IDE, VPN, GCC

Paradigms

Concurrent Programming, Database Design, Back-end Architecture, Socket programming, REST, Object-oriented Programming (OOP), DevOps, Real-time systems, High-performance Computing, Functional Programming, Object-oriented Design (OOD), Data-driven Programming, Clean Code, Refactoring

Platforms

Ubuntu Linux, LAMP, Red Hat Linux, Linux RHEL/CentOS, Kubuntu Linux, CentOS, CentOS 6, Debian Linux, FreeBSD, Ubuntu, Linux, Raspberry Pi, BSD, Unix, Xen, Django CMS, Android, Blockchain, Amazon Web Services (AWS), JSE, WinNT, Arduino, Win32, Keychain, Kernel Programming, Raspbian

Storage

Database Performance, PostgreSQL, SQLite, FlatFile, Cache, Memcached, DBA, Database Modeling, MySQL, smbd, Redis, DB, LevelDB, NoSQL, SQL Performance, SQL Stored Procedures, JSON, Cassandra, MongoDB, Berkeley DB, CouchDB, LVM, Firebird, Apache Derby, Database Replication, Internal Databases, MySQL daemon

Other

Cryptocurrency, SSH, System Administration, Open Source, HTTP, Back-end Development, SSL, System Architecture, Bitcoind, Memory Mapped Files, Cryptocurrency Development, RSync, Documentation, Public-key cryptography, TCP/IP, Unix/Linux Virtualization, GNU, FTP, SFTP, SMTP, Version Control, Software Architecture, Security Policies & Procedures, Architecture, ESP8266, Site Speed Optimization, TCP, Encryption, UDP, Web Services, Networks, Ethernet, Cryptography, Distributed File Systems, Bluetooth, Hardware, Electronics, Embedded Systems, Network Programming, White Papers, Prototyping, Firmware, Data Structures, HTTP Server, Regular Expressions, Hash, iSCSI, Writing, Bitcoin, Multithreading, Digital Electronics, Electronic Engineering, Algorithms, ARM Embedded, Unix Shell Scripting, AJAX, Apache Cassandra, Lean Development, Peer-to-Peer networking, OAuth, RSA, Protocol Buffers, SSO, Social Network Integration, Memory profiling, RPC, Genetic algorithms, IMAP, NFS, System Design, Electrical Engineering, Martini

Libraries/APIs

LibC, WebSockets, Lazarus, HTTP API, POSIX, Sockets, Arduino RTC, Web3.js, Puppet.js, jQuery, ZeroMQ, pcap, Google API, PyGTK, SDL, FFmpeg, Pygame, Social APIs, ODBC, Java Security, AES, LocalStorage, Python Imaging Library, Masonry

PhD degree in Computer Engineering

2006 - 2011

University of Zagreb - Croatia