At a Glance
- Tasks: Architect and build an AI-powered concierge system for a luxury membership platform.
- Company: BLACKLINE, an exclusive private membership platform in London.
- Benefits: Join a pioneering team with a focus on innovation and excellence.
- Other info: Opportunity to work in a dynamic environment focused on high-end user experiences.
- Why this job: Shape the future of personal care with cutting-edge AI technology.
- Qualifications: Strong experience in AI systems, voice tech, and backend engineering.
The predicted salary is between 80000 - 120000 € per year.
Company Description
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.
Overview
BLACKLINE is a private, invite-only membership across London focused on health, beauty, and personal care. We are building a concierge layer powered by AI — designed to handle booking, coordination, and member preferences across messaging and voice, with the standard and discretion expected of a private members’ network. This is not a typical startup role. We are building infrastructure for experience, not a product for scale.
What You’ll Build
- Architect and ship the BLACKLINE Concierge Agent, operating across:
- WhatsApp (Primary Interface)
- Natural conversation handling (LLM-driven)
- Booking coordination with providers
- Memory of member preferences
- Context-aware responses (time, location, history)
- Voice (Phone Concierge)
- Real-time conversational agent
- Natural, human-like voice (e.g. ElevenLabs or equivalent)
- Call handling (inbound + outbound)
- Seamless escalation to human when required
- 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
- Define architecture that scales without degrading experience
Technical Requirements
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)
What We Care About (More Than Stack)
- You ship fast — not just design systems
- You understand user experience in conversation, not just code
- You can balance automation vs human touch
- You care about detail, tone, and discretion
This is not:
- a chatbot
- a support tool
- a generic AI assistant
It must feel like:
👉 a private concierge that already knows the member
Nice to Have
- 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
Technical Co-Founder / CTO employer: BlackLine
At BLACKLINE, we offer a unique opportunity to be part of an exclusive private membership platform that prioritises excellence in aesthetics, wellness, and personal care across London. Our work culture fosters innovation and creativity, allowing you to build cutting-edge AI solutions in a collaborative environment while enjoying the benefits of a bespoke experience tailored to our discerning members. With a focus on personal growth and professional development, we empower our team to push boundaries and redefine luxury service, making BLACKLINE an exceptional employer for those seeking meaningful and rewarding careers.
StudySmarter Expert Advice🤫
We think this is how you could land Technical Co-Founder / CTO
✨Tip Number 1
Network like a pro! Get out there and connect with people in the industry. Attend events, meetups, or even online webinars related to AI and tech. You never know who might be looking for a Technical Co-Founder or CTO!
✨Tip Number 2
Show off your skills! Create a portfolio that highlights your past projects, especially those involving AI and voice systems. This will give potential employers a taste of what you can bring to the table.
✨Tip Number 3
Don’t just apply anywhere; apply through our website! We love seeing candidates who are genuinely interested in BLACKLINE and our mission. Tailor your application to show how you align with our vision of providing an exceptional experience.
✨Tip Number 4
Prepare for interviews by practising common technical questions and scenarios related to AI and backend engineering. But also be ready to discuss how you would create a seamless user experience, as that’s what we’re all about at BLACKLINE!
We think you need these skills to ace Technical Co-Founder / CTO
Some tips for your application 🫡
Show Your Passion for Personalised Experiences:When writing your application, let us see your enthusiasm for creating bespoke experiences. Highlight any past projects where you’ve tailored solutions to meet specific user needs, especially in high-end environments.
Be Clear About Your Technical Skills:We want to know what makes you tick! Clearly outline your experience with AI systems, voice technology, and backend engineering. Use specific examples to demonstrate how you've tackled similar challenges in the past.
Emphasise User Experience:Remember, we’re not just looking for a coder; we want someone who understands the nuances of user interaction. Share instances where you’ve balanced automation with a human touch to enhance user satisfaction.
Apply Through Our Website:Make sure to submit your application through our website. It’s the best way for us to keep track of your application and ensures you don’t miss out on any important updates from our team!
How to prepare for a job interview at BlackLine
✨Know Your Tech Inside Out
Make sure you’re well-versed in the technologies mentioned in the job description, especially AI and LLM systems. Brush up on your knowledge of prompt engineering, memory systems, and real-time speech pipelines. Being able to discuss these topics confidently will show that you’re not just a coder but someone who understands the intricacies of building a high-end concierge experience.
✨Showcase Your User-Centric Approach
This role is all about creating a seamless user experience. Be prepared to discuss how you balance automation with the human touch. Share examples from your past work where you’ve prioritised user experience in your designs, and how you’ve ensured that technology feels personal and bespoke.
✨Prepare for Scenario-Based Questions
Expect questions that put you in hypothetical situations related to the role. For instance, how would you handle a member's unique request or a technical issue during a booking? Practising these scenarios can help you articulate your thought process and problem-solving skills effectively.
✨Demonstrate Your Passion for Excellence
BLACKLINE values excellence and exclusivity, so it’s crucial to convey your passion for high-quality service. Talk about your experiences in high-end consumer environments and how you’ve contributed to creating exceptional experiences. This will resonate well with their brand ethos and show that you’re a good cultural fit.
