Staff Software Engineer (VoIP)

TL;DR

Staff Software Engineer (Python/VoIP): Setting the technical direction for a telecommunications platform with an accent on SIP signaling, media call control, and AI inference integration. Focus on scaling the platform to 10,000+ concurrent calls and designing high-availability disaster recovery systems.

Location: Remote (Any, except Russia and Belarus)

Company

hirify.global is a full-stack team specializing in developing and administering large-scale IT products across various industries worldwide.

What you will do

• Own end-to-end telecom architecture including SIP edge, media control, and Python services bridging voice to AI.
• Scale the platform to 10,000+ concurrent calls while maintaining tight latency and SLOs.
• Design HA and disaster recovery strategies such as anycast SIP and geographic failover.
• Establish engineering standards for testing, load testing, and code reviews for the telecom team.
• Mentor senior and middle engineers to raise the overall technical bar.
• Lead carrier strategy, including SIP trunk vendors, redundancy, and LCR.

Requirements

• 8+ years of engineering experience, with 4+ years specializing in production VoIP/Telecom.
• Deep production experience with FreeSWITCH and Kamailio or OpenSIPS at scale.
• Strong knowledge of SIP, RTP, SRTP, SDP, and ICE protocols.
• Proficiency in Python, with the ability to work in Lua, Go, or C as needed.
• Experience with production Kubernetes (GKE/EKS) and Terraform.
• English: B2-C1 level and Russian: B2 level required.
• Location: Must be based outside of Russia and Belarus.

Nice to have

• Experience with WebRTC at scale, RTPengine, Jitsi, or mediasoup.
• Knowledge of low-latency AI voice pipelines (streaming ASR/TTS, barge-in).
• Familiarity with STIR/SHAKEN and robocall mitigation.
• Compliance experience (SOC2, HIPAA, GDPR, PCI) for voice services.
• Experience hiring and growing a telecom team.

Culture & Benefits

• Remote-first culture with flexible working hours.
• Salary paid in USD.
• Training budget and paid conferences.
• Access to professional communities and onsite business trips.
• Long-term projects with global impact.