Mobile app development platform vendor Appcelerator secured US$15 million in Series C funding from a variety of investors including eBay, Mayfield, Red Hat, TransLink Capital, Sierra and Storm Ventures.

Appcelerator plans to use the additional cash to expand into Europe (the UK) and Asia (Japan, Korea and Greater China) and further develop its Titanium mobile development platform.

The company is now the largest third-party publisher on Apple and Android app stores, with its technology behind more than 30,000 mobile apps on 30 million devices. Around 1.6 million developers are using its technology.

Toshi Otani from TransLink Capital has joined the Appcelerator board as part of the financing deal.

Appcelerator’s technology provides a platform to build native, hybrid and HTML5 apps using a single code base. Appcelerator said the funding shows the growing importance of the type of technology it offers due to the fragmentation of the mobile app sector. It added that this fragmentation will continue with developments such as Amazon’s Fire tablet, the arrival of new features on iOS5, Samsung becoming the top smartphone vendor, Nokia moving to Windows Phone and HP considering the future of webOS.

Appcelerator acquired open source development company Aptana in January and recently announced it has agreed to acquire mobile gaming and HTML5 development platform Particle Code. The company increased its headcount from 17 employees to 100 during the course of the past year.