Middle Python Software Engineer

Middle Python Software Engineer

We are looking for a Software Engineer to join our ever growing Engineering team


As a Software Engineer, you will have a diverse working day, participating in all stages of the development lifecycle. Your tasks will include requirements review, solutions design and specification, coding, code reviews, and handling support.

The ideal candidate is clearly passionate about new opportunities and has a demonstrable track record of success in delivering new features and products without loosing focus on maintainability. Creating reliable, scalable, and high performance products requires exceptional technical expertise, a sound understanding of the fundamentals of Computer Science, and practical experience building large-scale distributed systems. This person has thrived and succeeded in delivering high quality technology products/services in a hyper-growth environment where priorities shift fast.


  • Development and optimization of PortaSIP components
  • Reviewing and extending functionality and capabilities of existing components (for instance improvements in terms of better scalability, failover, reliability, etc.)
  • Providing assistance for support with application issue troubleshooting
  • Proactive participation in discussion/design of new components/features/solutions which appear while PortaSIP/PortaSwitch evolves


  • Сustomer oriented approach
  • Proficiency with Linux/UNIX command line tools/environment
  • Strong understanding of network technologies and protocols (OSI model, NAT, DNS, IPv4/IPv6, TCP/UDP)
  • 4+ years in software development
  • 3+ years of experience with python system programming
  • Good knowledge of OOP, OOD principles

Additional Skills:

  • Experience with VoIP, VoLTE technologies
  • Knowledge of SIP, Radius, Diameter protocols, WebRTC technology
  • Experience with C/C++, shell scripting

We offer:

  • Interesting and challenging work in global software solutions vendor for modern telecoms
  • Flexible working hours
  • Competitive salary
  • English classes
  • Paid vacations: 24 business days; Compensatory leaves and paid Sick days
  • Great working conditions and comfortable office (near downtown - business center near metro station Kontraktova)
  • Corporate events and great team and friendly atmosphere

About us:

PortaOne creates software solutions enabling telecommunication service providers and carriers to offer multiple voice, data, and converged services on a single platform named PortaSwitch.

PortaOne products are built around a converged carrier-grade billing platform combined with a class 4-5 SIP softswitch and media applications for conferencing, IVR and unified messaging.

Our billing is RADIUS based and compatible with major SBC and media gateway vendors. It can process real time prepaid and postpaid charges for voice and video calls, Internet connectivity, MVNO and IPTV services, WiFi/WiMAX access, data and faxes, or one-time events such as SMS or a pay-per-view movie.

PortaSwitch is a unified platform for telecommunication service providers, wholesale carriers, ISP, MVNO and NGN operators for unifying voice, messaging, and data traffic within a single converged network.

PortaSwitch provides various prepaid, postpaid, retail and wholesale telecommunication services, including calling cards, Vonage- and Skype-like services, CLEC type services, MVNO & MVNE, ISP, WiMAX & WiFi and much more. It includes 2 main components:

PortaBilling, a business and operation support system (B/OSS) designed for telecommunication service providers to manage end-to-end telecom service networks.

PortaSIP is a clusterable and highly scalable SIP softswitch of class 4 and class 5 with media application that plays IVR (voice prompts). It offers a variety of both advanced class 5 features for hosted IPPBX or IP Centrex services as well as the majority of functionality normally attributed to session border controllers (SBC).

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