C++ Software Developer

GMV

Location not specified

Posted: January 23, 2026

Job Description

If you always dreamed about designing the KIIT of the future... Your place is here!

We are looking for a VoIP Systems Developer with strong C++ skills and experience in VoIP technologies.

You will be part of a multidisciplinary team in charge of developing and optimising telecommunication solutions based on IP communication protocols for railway systems. If you have experience in the design, implementation and optimisation of VoIP systems and a strong command of C++, this is your opportunity!

We´ll get to the point; we'll tell you what's not on the web. If you want to know more about us go to GMV website

WHAT CHALLENGE WILL YOU BE TAKING ON?

Your main responsibilities will be:

Design, develop and maintain VoIP solutions using C++ as the main language.
Implement and optimise VoIP protocols such as SIP (Session Initiation Protocol), RTP (Real-time Transport Protocol), and RTCP (Real-time Transport Control Protocol) for voice and video communications.
Collaborate with network teams to ensure efficient integration with VoIP servers and devices.
Perform debugging and troubleshooting in VoIP environments, ensuring high availability and quality of service.
Implement cybersecurity measures in VoIP communications.

WHAT DO WE NEED IN OUR TEAM?

For this position, we are looking for Graduates in Computer Engineering or similar with experience in:

VoIP technologies:

SIP (Session Initiation Protocol): You must be proficient in this protocol both in theory and in practice. This includes the ability to implement SIP clients and servers, as well as interaction with other SIP-based communication platforms.
RTP (Real-time Transport Protocol) and RTCP (Real-time Transport Control Protocol): Experience working with these protocols for real-time voice and video transmission. The ability to manage aspects such as media synchronisation, latency and quality of service (QoS) will be an asset.
SDP (Session Description Protocol): Knowledge in the use of SDP to describe multimedia sessions and negotiate codec and media parameters in VoIP systems.
PJSIP or OpenSIPS: Experience with these libraries or frameworks for the development of VoIP solutions. Ability to work with PJSIP for the management of multiple SIP channels is an asset.
Asterisk or FreeSWITCH server: Experience in configuring and customising VoIP servers based on Asterisk or FreeSWITCH for call management, conferencing and other communication services.

C++ and Familiarity with libraries for multimedia processing (e.g. GStreamer, FFmpeg).

WHAT DO WE OFFER?

Hybrid working model and 8 weeks per year of teleworking outside your usual geographical area.

Flexible start and finish times, and intensive working hours Fridays and in summer.

Personalized career plan development, training and language learning support.

National and international mobility. Do you come from another country? We can offer you a relocation package.

Competitive compensation with ongoing reviews, flexible compensation and discount on brands.

Wellbeing program: Health, dental and accident insurance; free fruit and coffee, physical, mental and financialhealth training, and much more!

️ In our recruitment processes you will always have telephone and personal contact, face-to-face or online, with our talent acquisition team. In addition, bank transfers and bank cards will never be requested. If you are contacted through any other process, please write to our team at [email protected]

❤️We promote equal opportunities in recruitment, and we are committed to inclusion and diversity.

WHAT ARE YOU WAITING FOR? JOIN US

#LI-Hybrid

If you have any questions please do not hesitate to contact Alejandra Estévez Melgarejo, in charge of this vacancy.

Alejandra Estévez Melgarejo

#LI-Hybrid

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