AI Developer · Prompt Engineering & Automation

Sebastian
Bennis

I design and ship production AI systems - multi-agent platforms, realistic voice agents, and the apps around them. Not demos: products that businesses already use.

London, UK
Portrait of Sebastian Bennis

About

Self-taught,
shipping fast.

I'm a self-taught AI developer who designs and ships real products end to end, across web, mobile and desktop. AI is core to how I build, not just a helper: years of hands-on work have made me fluent in prompt engineering - shaping the instructions and context that make models produce reliable, useful results - which I wire into products like multi-agent systems and voice agents.

I care about whether something actually works for real people, and I move fast to get there. I went from no formal training to shipping products people pay for.

Alongside my own products, I work in a live enterprise IT role supporting customers in English and French - which keeps me sharp at translating between technical, operations and commercial teams.

  • French · native
  • English · fluent
  • Spanish · basic

Selected work

Products that run in the real world.

Bridge Voice AI

Voice agent

A realistic AI voice agent that answers business calls 24/7 - qualifies and routes leads, books appointments, takes notes and follows up by SMS and email. It can also make outbound calls to pitch clients. Live and used by UK businesses.

  • Voice AI
  • Telephony
  • OpenAI / Anthropic
  • TypeScript

Marketing AI Platform

Multi-agent system

A marketing engine run by up to twelve coordinated AI agents. It pulls live data from Meta and Google, audits business websites, finds prospect emails and phone numbers, scores how likely a deal is to close, sends cold emails, makes realistic outbound sales calls, and auto-posts across social.

  • Multi-agent
  • LangGraph / LangChain
  • Meta & Google APIs
  • n8n

Skip the Pitch

macOS desktop app

A desktop app that finds local businesses with weak websites, grades them, builds a bespoke showcase site to put in front of the owner, and tracks the deal to won - replacing the spreadsheet, site-checker, page builder and CRM in one app.

  • Tauri
  • macOS
  • Google Places / OSM
  • CRM

More I've built

AI writing assistantBrowser & desktop

Rewrites, translates, proofreads and summarises text right where you work - with tones, saved templates and history.

Live translation appiOS

Real-time translation built natively for iPhone.

Virtual try-onWeb

Virtual try-on for clothing shops.

Business websitesWeb

Full business sites with authentication, payments and subscription systems.

Tech & capabilities

AI

  • Prompt engineering
  • Multi-agent orchestration (up to 12 agents)
  • Inbound & outbound voice agents
  • AI wired to live business data

Languages

  • TypeScript / JavaScript
  • Python
  • Swift
  • Kotlin
  • SQL

Frameworks & platforms

  • React / Next.js
  • Node.js
  • React Native
  • Tauri
  • Supabase, Convex, Cloudflare

Features I build

  • Authentication
  • Payments & subscriptions
  • Deal / CRM tracking
  • Secure back ends

Have something to build?

Get in touch