Sebastian
Bennis

Full-stack developer in London. I design and ship production software end to end: full-stack apps, multi-agent AI platforms and realistic voice agents.

Not demos. Products businesses already use.

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London, UK
Illustrated portrait of Sebastian Bennis, smiling, in glasses and a white shirt

Transcript

Hi there. Here's the short version of who Sebastian Bennis is. Sebastian is a full-stack developer based in London, and AI sits at the centre of everything he builds. He's self-taught, and for the past three years he's worked with AI every single day... not as a helper on the side, but as the core of how he ships software. And he ships real products. Bridge Voice AI is a voice agent that answers business calls around the clock. It qualifies leads, books appointments, and follows up by text and email. It's already used by businesses across the UK. He's also built a marketing platform run by up to twelve AI agents working together. Skip the Pitch, a desktop app that finds local businesses with weak websites and helps win them as clients. HeySnapMe, a Mac app for screenshots and screen recording. FitCapture, which lets you try on clothes virtually before you buy. And Cleverly Lingo, an AI keyboard for iPhone and Chrome that translates and rewrites as you type. On top of that, he's built twenty-three websites and eleven software apps for businesses. Day to day, he works in TypeScript, Python and Swift, with React, Next.js and Node. He speaks French natively, and English fluently. If you've got something worth building, the contact page is one click away. Thanks for listening.

Read by George, an AI voice from ElevenLabs.

Products that run in the real world.

What each one does, and how it works under the hood.

Bridge Voice AI(opens in a new tab)

Voice agent

Bridge Voice dashboard for a dental practice: the bookings calendar, the call log with plan usage, and the transcript of a call where the AI receptionist books a check-up

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.

  1. 1Call comes in
  2. 2Qualify the lead
  3. 3Book the appointment
  4. 4Follow up by SMS & email

Built with Voice AI, Telephony, OpenAI / Anthropic, TypeScript

Marketing AI Platform

Multi-agent system

Bridge Connect marketing platform: a lead agent coordinating eleven specialist AI agents on a website audit, and an AI-written article passing a quality check before it is approved and published

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.

  1. 1Pull Meta & Google data
  2. 2Audit websites
  3. 3Find contacts
  4. 4Score the deal
  5. 5Email, call & post

Built with Multi-agent, LangGraph / LangChain, Meta & Google APIs, n8n

Skip the Pitch(opens in a new tab)

Desktop app · macOS & Windows

Skip the Pitch finding boxing gyms with weak websites and scoring them, building a site for one in the Build Studio, and a finished dental studio site in the showcase

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.

  1. 1Find weak websites
  2. 2Grade them
  3. 3Build a showcase site
  4. 4Track the deal to won

Built with Tauri, macOS & Windows, Google Places / OSM, CRM

HeySnapMe(opens in a new tab)

macOS app

HeySnapMe's capture library and annotation editor, with an arrow, numbered steps and a highlight on a screenshot of a hiking page

A native Mac app for screenshots and screen recording. Capture an area, a window or a whole scrolling page, record video or GIFs, annotate, and pull the text out of any capture - with a searchable library that keeps everything on your Mac. Custom scroll-stitching, pixel-level element snapping and a hand-written GIF encoder.

  1. 1Press one shortcut
  2. 2Capture, scroll or record
  3. 3Annotate or pull out text
  4. 4Find it in your library

Built with Swift, ScreenCaptureKit, Vision OCR, AppKit / SwiftUI

FitCapture(opens in a new tab)

Web app & Chrome extension

FitCapture's website in a browser window: "See yourself in any outfit before you buy", with one model shown in sporty, romantic, professional, casual, elegant and chic looks

AI clothes changer and virtual try-on. Upload a photo and try on outfits before you buy, right in the browser - plus a Chrome extension that lets you try on clothes on any fashion site.

  1. 1Upload a photo
  2. 2Pick clothes on any fashion site
  3. 3See them on you

Built with Virtual try-on, AI imaging, Chrome extension

Cleverly Lingo(opens in a new tab)

iPhone keyboard & Chrome extension

Cleverly Lingo on Chrome and iPhone: the extension rewriting a message in its side panel and turning selected notes into a table, next to two iPhones showing a live English-Spanish conversation and the keyboard translating a message

One writing and translation assistant on two platforms. On iPhone, a keyboard that translates, corrects and changes the tone of what you type in any app, with a companion app for dictation and live two-way speech translation. In Chrome, an extension that rewrites, translates, summarises and dictates inside web pages - including Google Docs - with AI running locally on the GPU or in the cloud.

  1. 1Type in any app or site
  2. 2Translate, fix or restyle
  3. 3Review, then replace
  4. 4Speak live in Realtime

Built with Swift & Kotlin Multiplatform, Gemini Live, Chrome Manifest V3, WebGPU local AI

Also built

  • 23

    Websites for businesses

    Full business sites, with authentication, payments and subscription systems where they're needed.

  • 11

    Software apps for businesses

    Custom software built for businesses, from client-facing apps to the tools that run behind them.

Self-taught,
shipping fast.

Based in
London, UK
Building with AI
Every day, for three years
Speaks
French (native), English (fluent), Spanish (basic)

I'm a self-taught developer who designs and ships real products end to end, across web, mobile and desktop. I've been building with AI for three years now, and it's become my everyday way of working: not a helper on the side, but the core of how I build. That time has 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 work at this every single day, always building new ideas, collaborating with other developers, and learning as I go. I care about whether something actually works for real people, and I move fast to get there. That's how I went from no formal training to shipping products people pay for. Honestly, it's all part of the journey.

The stack

The languages, platforms and AI work I use day to day, in the format I spend most of my time in.

stack.tsTypeScript
// What I reach for mostexport const stack = {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"],platforms: ["React / Next.js", "Node.js", "React Native", "Tauri", "Supabase, Convex, Cloudflare"],features: ["Authentication", "Payments & subscriptions", "Deal / CRM tracking", "Secure back ends"],} as const;

Have something to build?

Tell me about the project, the role or the idea. I work in English and French.

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