SIP & VoIP Architect — Real-Time Communications

RESOURCESOFT, INC.; United States; On-site; USD 120,000 - 160,000; Full time

Job summary

Resourcesoft, Inc. is a Marlborough, MA-based technology consulting company seeking an experienced real-time communications engineer. The role focuses on architecting and improving scalable voice, video, and SIP infrastructure, with emphasis on high-availability routing and low-latency call routing.

Candidates should bring 5+ years in telecom systems and strong signaling/media delivery expertise. You will design and operate SIP routing, SBCs, and media servers, diagnose performance issues, and

Qualifications

• 5 years or more of experience developing and supporting real-time voice, video, VoIP, and telecommunications systems.
• Proficiency in SIP, VoIP, real-time communication protocols, signaling, media delivery.
• Experience with Kamailio, FreeSWITCH, Session Border Controllers, media servers, high-availability SIP routing.
• Experience with .NET, Node.js, TypeScript, Lua, backend services, call-routing automation.
• Experience with WebRTC, STUN/TURN, Asterisk, ANSI C, network troubleshooting, latency optimization.
• Excellent verbal and written communication skills.

Responsibilities

• Architect and enhance scalable voice, video, SIP, and real-time communications infrastructure.
• Design and operate highly available SIP routing, SBC, signaling, and media-server environments.
• Develop low-latency call-routing solutions and integrate voice and video services with applications.
• Diagnose packet loss, latency, signaling, media-quality, and network-performance issues.
• Optimize production VoIP platforms for availability, scalability, reliability, and performance.
• Establish technical standards, guide architecture strategy, and mentor engineers on telecom solutions.

Skills

Real-time communications

SIP/VoIP protocols

WebRTC

Latency optimization

Network troubleshooting

Communication skills

Tools

Kamailio

FreeSWITCH

SBC

Media servers

Asterisk

ANSI C

Job description

Resourcesoft, Inc. is a Marlborough, MA-based technology consulting company seeking an experienced real-time communications engineer. The role focuses on architecting and improving scalable voice, video, and SIP infrastructure, with emphasis on high-availability routing and low-latency call routing.

Candidates should bring 5+ years in telecom systems and strong signaling/media delivery expertise. You will design and operate SIP routing, SBCs, and media servers, diagnose performance issues, and