Join us we're hiring!

You will work closely with other developers and people in the open-source community. You are part of a team of VoIP experts to develop carrier-grade SIP softswitches conforming to the industry RFC standards and support the underlying packaging, deployment and maintenance cycles.


    • Interesting, demanding and challenging tasks
    • Gain international experience
    • Network with international experts and professionals within the community
    • State of the art technical equipment
    • We offer an attractive salary dependent on your qualifications. (Due to regulatory reasons we advise you that the collective agreement stipulates the fixed salary starting at EUR 2,518 gross/month for this position).
    • Cold & hot drinks, fruits, Social events, Laptop, Mobile phone.
    • Our employees can choose between a garage parking space or the “Wiener Linien” annual ticket.
    • We support and promote professional training.
    • Further education

    • SIP protocol knowledge, familiarity and passion for one of the open-source SIP proxies
    • Knowledge of SIP testing and simulation tools
    • Good knowledge of one of the following programming languages: Perl, C, Unix shell
    • Familiarity with highly available and highly loaded server systems
    • Bonus points: Debian GNU/Linux package maintenance, automated deployment skills
    • Fluent in English, any other language is a plus
    • University degree in IT field or relevant work experience
    • Previous experience with SIP-based VoIP systems (3-5 years), software or test development background
    • Solution-driven and goal-oriented personality
    • Ability to work autonomous and in a team
    • Willingness to travel for deployments, conferences or fairs

    • Integrate and develop new technologies and VoIP features
    • Work closely with peer Sipwise developers during the release engineering and testing process
    • Troubleshoot and fix escalated customer issues

You can expect a promising starting position in an internationally growing company within a dynamic market environment, with scope to develop your skills and capabilities and to achieve your career goals!