A 210-person law firm is integrating an AI voice agent into their existing phone system to improve caller response times and automate routine interactions - like wire transfer verification - without adding headcount. The existing secretary-driven infrastructure stays in place; the AI layer works alongside it to handle volume and reduce wait times. This is a live production environment where reliability is non-negotiable and the integration must be seamless.
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Hands-on PBX-to-SIP migration experience - has personally moved a live organization off a traditional POTS/PBX system onto a modern SIP trunk (Twilio, Telnyx, Sierra, or equivalent); can speak fluently to the physical-to-software boundary gotchas
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Phased rollout design - has built parallel SIP/legacy environments with incremental traffic shifting (1% \u2192 5% \u2192 25% \u2192 100%) and rollback capability at every step
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Production voice AI experience - has shipped real-time voice agent stacks using Retell, Vapi, LiveKit, or equivalent; understands latency budgets, turn-taking, and interruption handling
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Privacy & compliance fluency - familiar with PII, financial data, attorney-client privilege, Retell BAA coverage, and data retention obligations for regulated environments
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Non-functional requirements as a first-class concern - treats observability, uptime SLOs, failover, and call quality monitoring as core deliverables, not afterthoughts
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Strong English communication - able to reassure non-technical stakeholders and run structured weekly demos for both the client and internal OST leadership
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Prior experience deploying voice AI in law firms, financial services, or other regulated SMBs
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Familiarity with 3CX or similar mid-market PBX environments
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Background running forward-deployed engineering or managed services engagements
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Experience structuring milestone-based payment plans tied to phased delivery
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Lead the full technical architecture and delivery of an AI voice agent system enhancing a live law firm phone infrastructure
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Design and execute a phased PBX-to-SIP migration with rollback controls at every stage, keeping the firm operational throughout
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Lead and coordinate a team of 2 OST engineers across the engagement for the MVP stage
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Run weekly demos and maintain accessible test endpoints so both OST leadership and the client can verify progress firsthand
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Define and own non-functional requirements: uptime, latency SLOs, observability, failover, and call quality monitoring
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Break down the full implementation scope into clear phases (Phase 1 / 2 / 3), each delivering standalone value, paired with milestone-based payment checkpoints
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Act as the primary technical voice with the client - translating complex infrastructure decisions into clear, confident guidance for non-technical stakeholders
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Replace critical infrastructure, not just ship a feature - this is a full PBX migration for a big law firm; the technical stakes are real and the impact is immediate
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Own the architecture end-to-end - you'll define the stack, the rollout plan, and the compliance posture; there's no existing playbook to follow
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Work at the intersection of voice AI and regulated infrastructure - a rare combination that puts you ahead of most AI engineers who've never touched live telecom
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Build something productizable - OST retains the IP, and the runbooks and patterns you create here become the foundation for future engagements
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$150 - $200/hour - paid in USD via bank transfer (US-based candidates) or Deel (LATAM-based candidates)
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Fully Remote - must have strong understanding of US market and phone systems
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Freelance / Hourly contract - higher hours expected in the early project phases, tapering as the build stabilizes
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Referral Program - earn a bonus for referring talent that gets hired
Please send your resume in English.
Include the following:
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Cover Letter - tell us about a voice AI integration you've shipped into a live production environment and how you managed rollback risk (required - applications without this will not be considered)
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LinkedIn Profile URL (required)
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GitHub Repository (required)
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Certifications - if applicable (e.g. AWS, Twilio, telecom-related)
OneSeven Tech is an AI-enabled software agency headquartered in Miami, with 8 years building AI-driven digital products for scaling and established companies. We specialize in consulting, designing, and developing ROI-focused solutions across 22 industries - from healthcare and legal to real estate and fintech.
Our multidisciplinary team blends AI strategy, UX/UI, web and mobile engineering, and machine learning to deliver real outcomes. With 101+ successful projects completed and a 4.9/5 client rating, we work as a deeply embedded partner - not just a vendor. We operate as a remote-first organization with a global team and a US-based client portfolio.
