Member of Technical Staff - III, Software

Mavenir Systems, Inc.; Bengaluru; On-site; INR 3,000,000 - 4,500,000; Full time

Job summary

Mavenir is hiring for an advanced software engineer to design, develop, and test IMS-based SBC solutions. The role focuses on secure signaling, media handling, and high-performance networking for cloud-native environments.

You will work on SIP/IMS protocols, RTP/RTCP, and codecs, with emphasis on scalable, low-latency implementations across containerized deployments on Kubernetes. This position emphasizes hands-on development and deployment support.

Qualifications

• Core SIP/IMS Protocols must-have knowledge for call control and debugging
• Hands-on IMS call flows (VoLTE/VoWiFi) at P-CSCF/SBC layer
• Strong understanding of SDP offer/answer, codecs, and DTMF relay

Responsibilities

• Feature development for IMS based SBC solutions
• Managing existing deployments and customer support
• Building test framework for UT/IT features and fixes

Skills

SIP/IMS

C/C++ (14/17)

Multithreaded programming

SDP negotiation

RTP/RTCP

DTLS-SRTP

Networking protocols

Tools

Docker

Kubernetes

Valgrind

GDB

Job description

Mavenir is building the future of networks and pioneering advanced technology, focusing on the vision of a single, software-based automated network that runs on any cloud. As the industry's only end-to-end, cloud-native network software provider, Mavenir is transforming the way the world connects, accelerating software network transformation for 250+ Communications Service Providers in over 120 countries, which serve more than 50% of the world’s subscribers.

Role Summary Plans, designs, develops and tests software systems or applications for software enhancements and new products including cloud-based or internet-related tools.

Key Responsibilities Feature development for IMS based SBC solutions Managing existing deployments and customer support Building test framework to help test the new feature/fixes for UT/IT

Key Responsibilities

• Feature development for IMS based SBC solutions
• Managing existing deployments and customer support
• Building test framework to help test the new feature/fixes for UT/IT

Job Requirements

• Core SIP and IMS Protocol Development must-have Deep knowledge of SIP (RFC 3261 and extensions: PRACK, UPDATE, REFER, SUBSCRIBE/NOTIFY, PUBLISH) for implementing and debugging call control logic
• Hands-on experience implementing IMS call flows (VoLTE, VoWiFi, RCS) at the P-CSCF / SBC layer — registration, session establishment, supplementary services
• Strong understanding of SDP offer/answer model, codec negotiation (G.711, G.729, AMR, EVS, Opus), and DTMF relay mechanisms
• Experience with Diameter protocol development (Rx, Gx, Gy, Cx interfaces) and SCTP transport implementation
• Familiarity with STIR/SHAKEN identity framework implementation for call authentication and attestation
• C/C++ Programming skills must-have Expert-level C/C++ (C++14/17) for high-performance, low-latency signaling and media processing components
• Proficiency in multi-threaded programming, lock-free data structures, and event-driven architectures (e.g., select/epoll, Boost.Asio)
• Experience with memory management, profiling, and debugging tools (Valgrind, GDB, AddressSanitizer, perf)
• Media and RTP plan development must-have Solid understanding of RTP/RTCP, jitter buffers, packet loss concealment, and RTCP-based QoS feedback mechanisms
• Experience developing or integrating SRTP/DTLS-SRTP encryption for secure media transport in IMS environments
• Knowledge of media transcoding pipelines, codec adaptation, and SIPREC-based call recording architectures (nice)
• Familiarity with DPDK or kernel-bypass networking techniques for high-throughput media forwarding at scale
• Security features development must-have Experience developing TLS/mTLS session management, certificate lifecycle handling, and cipher suite negotiation in SIP stacks
• Ability to design and implement SBC security policies: topology hiding, header manipulation, DoS/DDoS rate limiting and blacklisting engines
• Experience containerizing SBC components with Docker and deploying on Kubernetes, including HA and geo-redundant topologies
• Understanding of NFV/MANO frameworks (ETSI NFV) and integration with VNFM/NFVO for lifecycle management of virtualized SBCs
• Designing REST/gRPC-based northbound APIs for SBC configuration, monitoring, and integration with OSS/BSS systems

Accessibility Mavenir is committed to working with and providing reasonable accommodation to individuals with physical and mental disabilities. If you require any assistance, please state in your application or contact your recruiter.

Mavenir is an Equal Employment Opportunity (EEO) employer and welcomes qualified applicants from around the world, regardless of their ethnicity, gender, religion, nationality, age, disability, or other legally protected status.

We embrace disruptive, innovative technology architectures and business models that drive service agility, flexibility, and velocity. With solutions that propel NFV evolution to achieve web-scale economics, Mavenir offers solutions to help CSPs with cost reduction, revenue generation, and revenue protection. We have strong values and are always looking for like-minded individuals to join us in the path to change the shape of our industry.

United: One Company; One team; One Unified Vision Passionate: Big thinkers with audacious ideas and solutions Honorable: Integrity, respect and commitment is in our DNA. Fearless: Courageous, bold, determined and challengers of the ‘norm’.

PLEASE NOTE: Mavenir will only communicate with you about your application through an “@Mavenir.com” or “[e-mail]” email address. Further, our site (including recruiting information) is only available at the “mavenir.com” and myworkdayjobs.com domains. Criminals may attempt to impersonate Mavenir or recruiting companies online. Please remember that Mavenir will never request that you wire funds or otherwise send money to us or any third party as part of your employment application. Please use caution and care when sending information online, and do not send us any sensitive personal information, such as Social Security numbers, through the Internet. If you have any question about your application or a communication from us, please do not hesitate to reach out to us at [phone] or email [e-mail].