Senior Software Engineer

Based in Dublin, Ohio, the Senior Software Engineer will design, implement, and operate real-time VoIP and communication services, with a focus on AI-assisted development and strong engineering fundamentals. The role requires hands-on production software experience, VoIP expertise, and collaboration on architecture and tooling.

Responsibilities

• Design, implement, and sustain VoIP and real-time communication services, including call routing, signaling paths, media processing, and the surrounding infrastructure.
• Integrate with carriers, SIP trunks, and telephony providers, diagnosing and resolving issues along the signaling and media journey.
• Identify and remediate real-time quality concerns such as latency, jitter, packet loss, one-way audio, and call setup failures, using packet captures and log analysis.
• Deliver clean, thoroughly tested features from design through production, with on-call responsibility for support and incident response.
• Leverage current AI assisted coding tools for daily development tasks such as generation, refactoring, review, and testing, while applying sound engineering judgment to all deployments.
• Participate in architectural decisions, review code from teammates and AI-generated contributions, and promote responsible adoption of new tooling within the team.
• Enhance observability, reliability, and security across the communications stack.

Requirements

• Minimum five years of professional software development experience delivering production systems, with strong fundamentals in data structures, systems design, debugging, and testing.
• Hands-on, up-to-date proficiency with AI coding tools for real production work, including multi-file changes, refactors, test generation, and code reviews, and the ability to verify and own outputs amid their failure modes.
• Experience with signaling protocols, especially SIP; familiarity with H.323 or other protocols is a plus.
• Knowledge of media transport protocols such as RTP/SRTP and RTCP, and familiarity with codecs like G.711, G.722, and Opus.
• Experience with WebRTC for browser- and app-based real-time communication.
• Background with PBX or softswitch platforms such as Asterisk, FreeSWITCH, or Kamailio.
• Experience with Session Border Controllers (SBCs), NAT traversal (STUN/TURN/ICE), and QoS concepts.
• Carrier and SIP trunk integration, number provisioning, and call routing experience.
• Proficiency across Go and Python on the backend, and Vue on the frontend, with strong experience in at least two of these and familiarity with the third.
• Solid networking fundamentals including TCP/UDP, DNS, TLS, firewalls/NAT, and the ability to read packet captures using tools such as Wireshark or sngrep.
• Experience owning code in production, including monitoring, on-call duties, and incident response.
• Strong written and verbal communication skills.

Technologies

• Claude Code
• Cursor
• GitHub Copilot
• Codex
• Windsurf
• Go / Golang
• Python
• Vue
• SIP
• H.323
• WebRTC
• RTP
• SRTP
• RTCP
• G.711
• G.722
• Opus
• Asterisk
• FreeSWITCH
• Kamailio
• SBC
• Session Border Controller
• NAT traversal
• STUN
• TURN
• ICE
• SIP trunk
• SIP trunks
• TCP
• UDP
• DNS
• TLS
• Firewalls
• Wireshark
• sngrep
• AWS
• GCP
• Azure
• Kubernetes
• Terraform

Benefits

• 401(k)
• 401(k) matching
• Dental insurance
• Employee assistance program
• Flexible schedule
• Flexible spending account
• Health insurance
• Health savings account
• Life insurance
• Paid time off
• Parental leave
• Referral program
• Retirement plan
• Vision insurance

Experience

Preferred: 4+ years of software development experience.

Ability to Commute

On-site role in Dublin, Ohio 43017 is required.

Nice to Have

• Experience with additional languages in the broader stack (for example, C/C++, Rust, TypeScript, SQL).
• Familiarity with the Model Context Protocol (MCP) and integrating AI tools into internal systems and workflows.
• Experience scaling real-time media Infrastructure, including media servers, transcoding, and conferencing/SFUs.
• Telecom regulatory awareness including E911, STIR/SHAKEN, and number portability.
• Cloud and infrastructure as code experience (AWS, GCP, or Azure; Kubernetes; Terraform).
• Open source contributions in telephony or real-time projects.
• Security-focused experience relevant to telephony, such as toll fraud prevention, encryption, and system hardening.