Full-Stack Engineer — Business Partner (India / UK / Remote)

About Mindible

Mindible is building AI voice agents for businesses that live on the phone: restaurants, hotels, clinics, and call centres.

Our agents handle real calls end-to-end (TTS, ASR, LLM), book tables or appointments, answer FAQs, and plug into your existing tools — so humans can focus on the work that actually needs them.

We’re pre-MVP and moving fast. If you like building from scratch and owning big chunks of product, this is for you.

What we’re building

A SaaS platform for AI voice agents that can:

• Answer and make calls in real time
• Connect to CRMs, booking systems, and POS
• Use TTS, ASR and LLMs to hold natural conversations
• Run on a modern, scalable stack

Lean Startup

small experiments → real user feedback → iterate fast. Think build–measure–learn, not build–hope.

The role

back end and core integrations

You’ll be:

• The technical lead for the platform (effectively a founding engineer / business partner)
• Making product decisions as much as technical ones
• Turning customer conversations into shipped features and experiments

If you enjoy 0→1, talking to users, and making things reliable in production, you’ll be happy here.

This is a business partner role, not a standard employee position.

• Milestone-based ownership of the business with a maximum of 10% ownership available as milestones are hit over time
• An additional 3% long-term bonus if you’re still on the founding team when we reach a £100m valuation
• Exact structure and vesting will be agreed together, aligned with the milestones above
• Salary & bonus: Cash compensation will start and grow as we hit product and revenue milestones
• We’ll agree a starting arrangement that makes sense for both of us (e.g. modest base + upside as we sign and retain customers)

Our stack (current & planned)

all

• Backend:

  Python (FastAPI / Django / similar), APIs (REST, webhooks), background workers

• Frontend:

  React, Tailwind CSS, SPA dashboard for customers

• Infra & data:

  Docker, AWS, Postgres (via Supabase), Redis or queues

• Voice & AI:

• Telephony: Twilio / SignalWire (or similar)
• ASR / TTS / LLMs (OpenAI etc.)
• RAG, vector DBs (e.g. pgvector / Pinecone)
• MCP servers and tool-calling style integrations

• Ops:

  Auth, logging, monitoring/observability, basic security and compliance hygiene

If you’ve used Node.js/TypeScript in the past, that’s absolutely fine too — the key is being fluent in modern web back ends.

What you’ll do (milestones)

We’ll tie equity to clear milestones so we’re aligned on outcomes:

• 0–6 months (by June 2026):

• Ship a working MVP voice agent from end to end
• A handful of pilot customers using it in the real world

• ~12 months:

• At least

  20 active users / businesses

  on the platform
• Basic analytics and feedback loops in place (call stats, success rates, etc.)

• ~18 months:

• Tighten product–market fit: refine features based on what customers actually use
• Improve reliability, speed, call quality, and the agent’s “brains”

• ~3 years:

• Platform and customer base aiming towards a

  £20m valuation

• ~5 years:

• Targeting a

  £100m valuation

  with a mature, sticky product and clear economics

Day to day, that looks like:

• Designing and building APIs, data models, and integrations
• Standing up and hardening our infra on AWS
• Working closely with the founder on customer interviews, product experiments, and roadmaps
• Keeping quality high without over-engineering: tests where they matter, logs where we’ll actually read them
• Reviewing your own work critically and shaping the overall architecture as we grow

You’ll be a good fit if you:

• Have

  4–8+ years

  building SaaS back ends & APIs in production
• Have worked on

  real-time systems

  , queues, or telephony (nice to have, not mandatory)
• Are pragmatic about

  testing, security, and ops

  — not reckless, not perfectionist
• Are happy to

  own architecture

  and do code reviews
• Enjoy talking to users and turning feedback into changes
• Like

  Lean Startup

  thinking: ship small, measure, learn, adjust

India or UK-friendly time zones

The intention is very simple: if you help build a valuable company, you should own a meaningful piece of it.

How we work (Lean Startup style)

• We

  prioritise learning

  over guessing: quick experiments, interviews, and usage data drive decisions
• We favour

  small, shippable slices

  over big “perfect” releases
• We measure what we ship wherever reasonable: call success, drop-off points, user actions
• We’re honest about what’s working and what isn’t, and are willing to kill features fast

If that sounds like your idea of fun, you’ll fit right in.

How to apply

janeiro.meosa@mindible.co.uk

• Your GitHub / portfolio or 2–3 live products you’ve shipped
• A short note on your most relevant experience
• Your availability (start date + preferred hours/time zone)

• One paragraph:

  how would you take a scrappy pilot voice agent to a reliable, billable production product in

  30 days

  ?

We’ll start with a relaxed chat about your experience, the product, and whether the milestones and equity structure feel right for you.