Senior Software Engineer – InterSignal Systems Interface (ISSI) Developer

Westford, MA

Qualified candidates must be lawfully authorized to work in the U.S.


Mutualink believes an unpredictable world does not have to be unprepared. Our company is committed to elevating our ability to connect and care for our communities. This commitment has created a communications platform designed to remove what limits us from acting in an inclusive, informed and coordinated way, no matter the situation.

Mutualink’s Software Development Team seeks a Senior ISSI Developer to join us in our great accomplishments.

Primary Duties and Responsibilities:

  • Developing real-time voice/video/data software solutions to support customer requirements
  • Developing integrations with third party communication systems
  • Collaborating effectively across development teams, QA and Customer Support
  • Participating in product planning and assisting with defining requirements

Job Qualifications

  • 7+ years software engineering experience in a complex system environment
  • Proven experience in building, delivering and maintaining embedded real-time communications software
  • In-depth knowledge of Voice-over-IP (VoIP) design including SIP, RTP, and audio processing
  • Expert level knowledge of C++
  • In-depth knowledge of the Linux operating system including commands, utilities, and configuration
  • Solid working knowledge of IP networks and network protocols
  • Working knowledge of VM and container technologies (e.g. Docker) on Linux platforms
  • Experience with implementing Push-to-Talk (PTT) and Radio-over-IP (RoIP) voice systems
  • Familiarity with video streaming protocols and video codecs
  • Understanding of ACE and/or BOOST C++ frameworks
  • Experience with Agile CI/CD environments and tools such as Git, Jira and Confluence
  • Ability to apply problem solving skills in a collaborative environment
  • BSCS/EE or equivalent

Interested in this position? Email your resume and cover letter to

Job level assignment and associated compensation are determined based on the Company’s assessment and evaluation of a candidate’s overall qualifications and experience in accordance with its policies.

Equal Employment Opportunity and Affirmative Action

Mutualink, Inc. (“Mutualink or Employer”) is an equal employment opportunity and affirmative action employer, dedicated to the policy of nondiscrimination in employment on any basis prohibited by law. Mutualink is committed to providing equal employment and advancement opportunities without consideration of race, color, religious creed, age, sex, sexual orientation, gender identity or expression, marital status, national origin, ancestry, veteran status, mental retardation, genetic information, disability, or other legally protected status, unless there is a bona fide occupational qualification under applicable Connecticut statute excluding persons in one of the foregoing protected groups. Additionally, Mutualink will take affirmative action to ensure workplace equality, avoid all forms of discrimination, and develop a workforce that is representative of all segments of the population.