gem
Senior Software Engineer – Core VoIP / SIP Backbone
Practice by Numbers
Bellevue, USA
Full-time
Senior Level
Hybrid
USD 150000-180000 yearly
Discovered 1 weeks ago
Free
Job Fit Check
Base Career helps you apply smarter for this job.
?%
Ready to ScanFull Job Posting
- Design and implement a carrier-grade SIP/VoIP core using components like Kamailio/OpenSIPS for SIP signaling and FreeSWITCH or similar for media and application services.
- Build Golang-based SIP services (registrar, SBC-like components, routing logic, monitoring daemons) and internal APIs to control routing, policies, and provisioning.
- Configure and operate SIP load balancing, failover, and high-availability setups (multi-node SIP proxies, distributed media servers, RTP proxies).
- Implement and maintain dial plans, least-cost routing, DID management, class-4/class-5 style switching logic, and integration with upstream carriers and PSTN gateways.
- Own security and robustness of the VoIP stack: TLS/SRTP, authentication/authorization, rate limiting, fraud detection hooks, and abuse controls.
- Integrate the telephony backbone with PBN's SaaS platform (user accounts, billing, analytics, AI/automation flows) via well-defined internal APIs and webhooks.
- Define monitoring, alerting, logging, and capacity planning for SIP signaling, RTP/media, and VoIP quality (MOS, jitter, packet loss).
- Collaborate with product and operations teams to translate business requirements (IVRs, call queues, routing rules, AI agents) into resilient VoIP and backend designs.
- 7–10 years of software development experience with at least 4–5 years building or operating large-scale VoIP/SIP systems.
- Strong Golang skills, including building high-performance networked services, concurrent processing, and production-grade APIs.
- Hands-on experience with at least one open-source SIP server such as Kamailio/OpenSIPS and one media/application server such as FreeSWITCH or Asterisk, including configuration, routing logic, and troubleshooting.
- Deep understanding of SIP, RTP, SDP, NAT traversal, registrar/registrations, B2BUA vs. proxy behavior, and SBC concepts.
- Proven ability to design and run highly available telephony backbones: clustering, health checks, load balancing, and graceful failover.
- Strong Linux and networking fundamentals (iptables, firewalls, TCP/UDP, QoS), comfortable debugging at packet level using tcpdump/Wireshark.
- Experience integrating VoIP platforms with RESTful backends, databases (PostgreSQL or MariaDB/MySQL), and message queues for control and billing workflows.
- Experience with WebRTC, SIP over WebSockets, and browser/mobile softphone integrations.
- Familiarity with VoIP billing, rating engines, CDR processing, and reseller hierarchies (class-4/class-5 softswitch products or similar).
Apply for this job in 1 click
Skip the repetitive application forms
Install the Base Career Chrome Extension and autofill job applications across major job boards with your profile.
Trusted by over 500,000 job seekers on Base Career
More from this employer
More jobs at Practice by Numbers
Content Writer
Gurugram, IND
Discovered 2 days agoFull-time
Performance Marketing Manager
Gurugram, IND
Discovered 2 days agoFull-time
Senior Manager Quality Engineering
Gurugram, IND
Discovered 3 days agoFull-time
Sr. FullStack Software Engineer
Bellevue, USA
Discovered 1 weeks agoFull-time
Sales Development Representative (SDR) (Copy)
, USA
Discovered 1 weeks agoFull-time
Sr. Account Executive
, USA
Discovered 1 weeks agoFull-time
Senior Software Engineer, AI
Gurugram, IND
Discovered 1 weeks agoFull-time
UX Designer
Gurugram, IND
Discovered 1 weeks agoFull-time