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Technical Co-Founder / CTO

BlackLine, Inc., City of Westminster

Technical Co-Founder / CTO

Salary not available. View on company website.

BlackLine, Inc., City of Westminster

  • Full time
  • Permanent
  • Onsite working

Posted today, 3 May | Get your application in now to be one of the first to apply.

Closing date: Closing date not specified

Job ref: bc60053073b54d08830a2707d8f272df

Location ref: City of Westminster

Full Job Description

  • Seamless escalation to human when required
    • 3. Backend Intelligence Layer
  • User profiles + preference memory
  • Provider availability + scheduling logic
  • Workflow orchestration (requests bookings confirmations)
  • CRM integration
    • Core Responsibilities
  • Design and build the end-to-end AI concierge system
  • Select and integrate LLMs, voice models, and orchestration frameworks
  • Build WhatsApp automation (e.g. via Twilio, Meta APIs, or equivalent)
  • Implement real-time voice pipeline (speech-to-text reasoning text-to-speech)
  • Ensure low latency and high reliability
  • Maintain strict data privacy and security standards

    You should have strong hands-on experience in:
    • AI / LLM Systems
  • Prompt engineering + agent design
  • Tool use / function calling
  • Memory systems (vector DBs, session memory)
  • Multi-step workflow orchestration
    • Voice Systems
  • Real-time speech pipelines (STT / TTS)
  • Latency optimisation for conversational flow
  • Experience with providers like ElevenLabs or similar
    • Messaging Infrastructure
  • WhatsApp API integrations
  • Event-driven systems
  • Webhooks and async processing
    • Backend Engineering
  • Node.js / Python (preferred)
  • API design
  • Database design (relational + vector)
  • Cloud infrastructure (AWS / GCP), You understand user experience in conversation, not just code
  • You can balance automation vs human touch
  • You care about detail, tone, and discretion, Experience building AI agents in production
  • Experience with booking / scheduling systems
  • Familiarity with CRM tools (HubSpot, custom pipelines)
  • Background in high-end consumer or service experiences, Early-stage / pre-scale
  • Building MVP live concierge refined system
  • Equity-based co-founder role

    BLACKLINE is an exclusive private membership platform designed to provide an exceptional experience in aesthetics, wellness, fitness, and personal care across London. We pride ourselves on a meticulously curated network of top-tier operators to meet members' high standards. With a focus on personalized attention, BLACKLINE offers a seamless and bespoke experience. Membership is granted selectively, catering to individuals who value excellence and exclusivity.

Direct job link

https://www.jobs24.co.uk/job/technical-co-founder-cto-126790619
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