SEVEN is seeking for Senior C Developer for VoIP/IM Softphone Application project

VoIP/IM Softphone Application from the scratch using third-party libraries
Basic Options: vanila pjSIP, Smack, Asterisk, OpenFire; includes all the functionality exept custom cipher (Rabbit)
and PTT
Push to talk: customized pjSIP and Asterisk
Rabbit Cipher: interconnecting shared library, customized pjSIP, Asterisk, Smack and OpenFire
SRTP: customized pjSIP

• Customize pjSIP library
• develop shared library that extends OpenSSL functionality
• implement custom encryption for SRTP
• provide updates for makefiles
• Troubleshoot and debug software
• Work with Development Team and Project Manager to ideate software solutions

Skills and Qualifications:
• Crypto (OpenSSL, TLS)
• Android NDK (shared libraries)
• Makefile
• Linux
• Asterisk
• Java/JNI
English level
Intermediate Strong.

Work Remotely

Desire to start: December 15, 2020

Looking forward to collaboration!

About Seven

SEVEN is the full-service IT company that for 13 years has been a reliable 360º technological partner for our clients from North America, EU, APAC, and Australia.
We have a splendid reputation of high-quality software development company dealing with the business process automation, building SaaS, B2C, B2B applications, subject-oriented social networks, online shops, announcement boards, data portals, corporate websites as well as the development of iOS, Android, and cross-platform mobile applications.
The most pivotal reason why you should work with us is that we are an experienced team of young and resourceful people who promote a friendly environment. Our employees are computer techies who strive towards success and excellence and also young specialists who pursue their dream. Constantly being involved in complex projects, has allowed our employees to boost their professional level of experience and expertise, acquire new skills as well as augment them, and also learn new technologies along the way.
We put a great emphasis on providing the right means for our employees to stretch and grow towards greatness. We offer the opportunity for career growth and comfortable accommodation for our team members:
· Competitive salary
· Career development
· Possibility to learn new technologies
· Understanding employees needs
· English courses (speaking and grammar) for different levels
· Self-development training
· Decent amount of Tech Talks
· Team building and a lot of fun
· BTW, SEVEN is a member of Lviv IT Cluster (all our team members have Lviv IT Club discount card).
Now we are growing swiftly, which is why we are engaging professionals and young specialists who are at the very beginning of their careers in IT to join our team

Company website:

DOU company page:

Job posted on 4 January 2021

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