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We are a multinational Swiss software company with more than 20 years of experience in the Unified Communication sector. We offer a unique Application Platform called “Callisto” dedicated to Cisco UCC Solutions.


Our mission is to support Cisco System Integrators and Service Providers to enhance their communication infrastructure for vertical markets like Enterprise Communications, Cruise, Hospitality, Healthcare Solutions, and more.


The broad selection of application modules for every market, catapults Callisto to a market leader position. From on-prem to Cloud/UCaaS projects, we make it easy for companies around the world to bring their communications to the next level. - We start where others stop!


Ready to come on board and be part of the core development team?

We are looking for a skilled




possibly with experience in the development of Unified Communications Software in the area of Cisco UCC.

Your skills and abilities:

—  Experience in programming Server-based, Web, and maybe UCC projects

—  Java, C++ , HTML, CSS, JavaScript, SQL

—  Analytical capacity with great attention to detail and capability of explaining concepts

—  Helps to achieve jointly set goals in a timely manner

—  Fast learner with an ability to quickly adapt to new situations

—  A good team player, all-rounder, customer-oriented, dedicated

—  Fluent in English (written and spoken; ideally also in German)


Our offer:

Join us on this exciting journey and gain valuable experience in a young and innovative team!

Pleasant working environment, 100% or part-time position, state-of-the-art technologies in attractive industry, modern working conditions, development opportunities, responsibility, work location Niš (Serbia).



Are you interested?

We are looking forward to receiving your complete application documents.

If you have any questions, please feel free to contact us.



Mr. Batica Dzonic,

Head of Competence Center

Gospodara Vučića 145

RS-11000 Belgrad


Tel: +381 18 308076




Lehnweg 1

CH-3123 Belp/Berne

T: +41 (0)31 531 11 11

F: +41 (0)31 531 11 12

Sales&Support GERMANY


Frankfurter Straße 92

D-65760 Eschborn/Frankfurt

T: +49 (0)6196 2049173-0

F: +49 6196 2049 173-9



Founded in 1997 and incorporated in Switzerland, CTModule AG specializes in communication and information technology and maintains a wide range of proven solutions in this field. The Company is focused on Enterprise Communication and Hospitality & Guest Service solutions. CTModule is a “Preferred Solutions Partner” of Cisco® Systems and a member of “Swiss Made Software”.

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