Software engineers. Specialising in LLM integration and agents.

Made in the UK
ReactNext.jsTypeScriptPythonNode.jsSupabaseAWSGCPStripeDockerOpenAIVercel

Selected Work

  1. relevehq.com2026

    Payment System Rebuild & Data Migration

    Audited and rebuilt the payment system for a dance studio management platform using Stripe Connect. Wrote 500+ automated tests exposing ~20 bugs across complex pricing logic — stacking benefits, multi-class discounts, family caps. Set up local development environment with Stripe webhook integration and prepared a full data migration from Lovable Cloud to Supabase.

    ReactSupabaseStripe ConnectVitestVercel
  2. Prisma Group2025

    In-Store AI Avatar

    Fixed and rebuilt the frontend for an interactive AI avatar deployed in a Swiss beauty store. A camera detects when a customer approaches, and a HeyGen avatar greets and talks to them on a TV screen. Diagnosed and fixed WebSocket issues that were silently draining HeyGen credits, added conversation logging, and provided ongoing remote support via AnyDesk.

    ReactDockerPythonHeyGenWebSocket

    One of the most skilled guy I've ever met. Fast, precise and proactive. You did a great job!

    AlessandroFounder
  3. Amicus Health2024

    HIPAA-Compliant Audio Transcription Platform

    Built a full-stack audio transcription platform from scratch. Users upload audio files, which are processed via the Deepgram API with speaker diarisation, then exported as TSV, DOCX, or JSON. Includes Google OAuth, HIPAA-compliant mode, project management, and a cron job for file cleanup. Deployed on Fly.io with Tigris object storage.

    Next.jsNextAuthDeepgramFly.ioSupabaseTigris

    William is fantastic! Definitely hire him! He made a realistic proposal and was able to complete it on time and on budget. He saw the vision of the project and when he faced problems, he did the research and communicated tangible solutions. You will not be disappointed.

    SteveFounder
  4. blackcollar.ai2024

    Secure Data Storage MVP

    Full-stack MVP for a secure cloud storage platform. Auth, file upload and viewing, nested folder structures, and usage-based Stripe billing — built and shipped in one week.

    Next.jsShadcnGCPNextAuthStripe

    William impressed me with his professionalism and commitment to delivering high-quality work. He has strong technical skills, adding in his expertise to help find more efficient solutions. When I suggested using new tools or libraries that he had not used before, William was very adaptable. He set up the entire system in a way that was easy for me to understand and manage going forward. Throughout the project, William maintained excellent communication, keeping me updated with regular progress reports. The MVP William developed is technically solid and aligns with my current needs. I would highly recommend William to anyone looking for a competent, professional, and reliable full-stack developer.

    SaifFounder
  5. Mallat Entertainment2023

    Presentation-Based SaaS Prototype

    Built a prototype SaaS tool for creating and personalising presentations in the browser. Users create slides with drag-and-drop text and images, assign variable placeholders, upload a CSV to populate them, and download the result as .pptx files.

    Next.jsReact

    William is very professional, is great at communicating your project needs and is very good at what he does. He helped me produce a prototype within a few days. Had a great experience overall and would recommend working with William!

    JoeyFounder
  6. Lifecycle2023

    CMS-Integrated Manufacturer Directory

    Integrated Strapi CMS into an existing React web app to power a browsable manufacturer directory with search, filtering, and favourites.

    ReactStrapiNode.js

    William shows absolute competence in picking up your current tech stack with ease, or suggesting great alternatives. A fast and detailed developer with great communication skills. Highly recommended.

    SamuelFounder
  7. Untagged Fashion2022

    AI Clothing Inpainting Demo

    Built an AI-powered demo tool for a fashion resale startup that let users swap clothing on photos using Stable Diffusion inpainting. Users select a person's clothing region, enter a text prompt describing new clothing, and the tool generates a composite image with the original outfit replaced. The backend chained three model calls — segmentation, inpainting, and compositing.

    Next.jsReactStable Diffusion