Software Engineer

Cisco Systems, Inc.; United States; On-site; USD 120,000 - 180,000; Full time

Job summary

Cisco Systems, Inc. is seeking a highly skilled software engineer for the Unified Communications team. You will contribute to embedded C development for VoIP and DSP-based voice gateways, supporting both cloud and on-prem solutions.

You will work on signaling, codecs, and media paths, with a focus on performance and reliability across Cisco VG products and UC platforms. Ideal candidates have deep VoIP knowledge, strong debugging skills, and experience with test beds and network protocols.

Qualifications

• Masters with 6 years of relevant experience or Bachelor's with 8 years in Networking or Telecom.
• Hands-on End-to-End software development for VoIP or Voice Gateway products.
• Strong embedded C programming and debugging skills; able to handle large code bases.

Responsibilities

• Develop and sustain software for VoIP and Voice Gateway products.
• Collaborate with senior engineers to deliver robust embedded solutions.
• Debug and optimize VoIP signaling and media paths using packet capture tools.

Skills

Embedded C

VoIP

DSP

Codecs

Voice signaling

TCP/IP

DNS/DHCP

Packet capture

Wireshark

End-to-End software development

Test bed setup

Education

Masters in Networking or related field

Bachelor's degree in Networking or Telecom

Tools

GDB

Wireshark

Testbed setup

Job description

Meet the Team

We are the Unified Communications (UC) Software Development team within Cisco Routing Business Unit under the Workplace Technology Group. Our team is responsible for a wide range of voice solutions, including Cisco flagship Voice Gateways (VG) for both Cloud Calling and On-Prem Calling, Digital Signal Processors (DSP) modules, as well as Analog and Digital Voice Modules operating on Catalyst 8200/8300 routing platforms. We also develop VoIP applications such as audio conferencing, transcoding, SWMTP, Fax, and Secure Modem for DoD and DoJ, and Secure Voice (TLS and sRTP).

Our mission is to develop and maintain a competitive and high-quality VG and VoIP products, support the transition from on-prem to cloud calling, and integrate key UC capabilities into Cisco SD-WAN.

Join our high-energy team to help build the next-generation VG and drive the transition of on-prem voice solutions to the cloud.

Your Impact

You will join a team of talented and experienced software engineers on SW development and sustaining.

Minimum Qualifications

• Masters combined with 6 years of related experience, or Bachelors combined with 8 years Networking or Telecom industry experience. Hands on experience on End-to-End Software development in areas of VoIP or Voice Gateway products.

• Strong Embedded C programming and debugging skills. Capable of handling large SW code base and independently resolving issues with speed and quality.
• Deep understanding about VoIP, DSP and codecs, voice signaling protocol, and voice media.
• Solid knowledge of networking fundamentals such as TCP/IP, DNS, and DHCP. Understanding on use of packet capture including wire shark to debug VoIP signaling and voice media path in the network.

• Working experience to set up test beds, recreate issues and perform tests to debug failures.

Preferred Qualifications

• Good knowledge of the analog interfaces such as FXS/FXO/E&M or the digital interfaces such as T1/E1/ISDN PRI, T1CAS/E1R2, and BRI. RTP and RTCP, Voice Supplementary Services. In-band and out-of-band DTMF relay, T.38 fax relay, and modem relay.
• Experience with debugging tools including gdb to debug crash, memory corruption issues.
• Experience on WebEx Calling, Microsoft Cloud Calling, ZTP.
• Experience with Cisco's unified communication platforms like CUCM and collaboration tools.

Why Cisco?

At Cisco, we’re revolutionizing how data and infrastructure connect and protect organizations in the AI era – and beyond. We’ve been innovating fearlessly for 40 years to create solutions that power how humans and technology work together across the physical and digital worlds. These solutions provide customers with unparalleled security, visibility, and insights across the entire digital footprint.

Fueled by the depth and breadth of our technology, we experiment and create meaningful solutions. Add to that our worldwide network of doers and experts, and you’ll see that the opportunities to grow and build are limitless. We work as a team, collaborating with empathy to make really big things happen on a global scale. Because our solutions are everywhere, our impact is everywhere.

We are Cisco, and our power starts with you.