I am Sebastian Volland — freelance software developer based in Cologne with over 10 years of experience in software development. I am specialized in iOS, OS X and web application development. Most of the time I code in Swift, Objective C, C++, PHP and JavaScript. Visit for some of my open source code.

My Apps

Freeze is a native Amazon Glacier client for Mac OS X. The app is available on the Mac App Store.
Written in Swift
Reimmaschine – german rhyme dictionary. There is a web based version and also an iOS app available on the App Store.
Backend is PHP/MySQL. App is written in Objective C.
FinalFighter – Tank battle game available for iOS and for Mac OS X. The game is open source - the full source code is available on GitHub.
Objective C, Cocos2d

Work experience (excerpt)

Worked as CTO of a mobile app start-up. Responsible for iOS app development, server code, database and cloud architecture.
Objective C, Swift, PHP, MySQL, Amazon AWS
Enhancement of a large e-commerce website for a client. Frontend and backend development.
PHP, JavaScript, Linux sysadmin
Since 2012
Started self employment focussing on iOS and Mac OS X development of own apps and apps for clients.
Xcode, Objective C
Worked as Senior Software Engineer at Sevenval building a large clustered web application. Worked exclusively with Linux on desktop and servers.
PHP, JavaScript, C++, C, Linux
Developed shareware applications for Windows. Experimented a lot with game development. Started web development and moved from Windows to Debian Linux on the desktop.
Borland Delphi, DirectX, PHP, Linux

Client feedback

Sebastian is the perfect combination of professionalism and experience. He is an excellent programmer and almost more importantly, I trust he will get the job done as quickly and efficiently as possible. He is straight forward and honest, and makes sure the project gets done right.
Job type: iPhone Game Development with PHP backend
I cannot say enough good things about working with Sebastian. I came to him with the request of building a prototype for a mobile application for iOS. Sebastian impressed me with the following: - He is extremely organized, thoughtful and clear in his communication. - He works extremely quickly and gets things done! - He is extremely smart and a very talented developer. He had no problem picking up new skills along the way. - His coding is extremely organized and very well done. - Wonderful attitude and great personality. I highly recommend Sebastian!
Job type: iPhone App Development
It was a pleasure working with Sebastian. He was timely with his responses, and he is a wonderful writer you who writes extremely detailed and comprehensive responses. Despite my lack of technical skill, Sebastian was patient and willing to answer all of my questions.
Job type: iPhone App Development
Very professional, great quality of work. Top contractor, very easy to communicate, extremely helpful. Very recommended. Thank you!
Job type: Web Application Development