Principal Software Engineer (Real-Time Voice)

TL;DR

Principal Software Engineer (Real-Time Voice/VoIP): Designing and owning the technical direction of real-time voice infrastructure for AI agents with an accent on low-latency audio pipelines, SIP trunking, and enterprise-scale telephony. Focus on solving complex challenges in call quality, jitter, and packet loss across multi-region deployments to ensure seamless conversational AI interactions.

Location: Berlin Office

Company

hirify.global builds agentic AI that enables global enterprise brands to create effortless and meaningful customer conversations at scale.

What you will do

• Own the architecture and technical roadmap for Voice/VoIP infrastructure, including SIP trunking and real-time audio pipelines.
• Design high-availability, low-latency voice systems across global telephony carriers and providers.
• Drive technical decisions on protocols (SIP, SDP, RTP, WebRTC) and real-time media transport.
• Optimize the integration between voice infrastructure and conversational AI models (ASR, TTS, turn-taking, barge-in).
• Diagnose and resolve systemic issues regarding call quality, latency, jitter, and packet loss.
• Mentor senior and staff engineers, acting as a technical multiplier across the organization.

Requirements

• 10+ years of engineering experience, with 5+ years in production Voice/VoIP or carrier-grade voice infrastructure.
• Deep expertise in SIP, SDP, RTP/SRTP, RTCP, WebRTC, ICE, and real-time media transport protocols.
• Hands-on experience with audio codecs (Opus, G.711/G.722) and SIP-based infrastructure such as Kamailio, FreeSWITCH, or Asterisk.
• Strong systems programming skills in Go, C, C++, or Rust.
• Experience with cloud environments (AWS, GCP, or Azure) and Kubernetes.
• Proven track record of owning architecture for complex, large-scale distributed systems with strict latency requirements.

Nice to have

• Experience instrumenting voice-quality observability and analyzing MOS metrics.
• Genuine interest in AI and conversational technology.

Culture & Benefits

• High-intensity environment with a focus on fast execution, direct feedback, and extreme ownership.
• Culture based on technical excellence, transparency, and a strong bias for action.
• Opportunity to shape the foundation of agentic AI for global enterprise brands.
• Backed by leading global investors including General Catalyst, EQT Ventures, and Altimeter Capital.

Hiring process

• Recruiter Call.
• Technical Peer Interview.
• 360° Tech Interview Loop.
• Bar Raiser.