Hi, I'm Stephen Rayner
Fullstack Product Engineer & CTO
14+ years architecting and coding scalable solutions. Leading engineering teams to deliver cloud-native platforms with AI/ML integrations.
About Me
Fullstack Product Engineer & CTO with 14+ years of experience actively architecting and coding solutions
I'm a hands-on Fullstack Product Engineer and CTO with over 14 years of experience in software development and technology leadership.
I specialize in building scalable cloud-native platforms, implementing AI/ML solutions, and leading high-performing engineering teams.
My expertise spans AWS cloud architecture, modern web technologies (React, Node.js, TypeScript), and emerging technologies like local-first (TanstackDB / ElectricSQL) AI integrations (Vercel AI SDK, OpenAI and Claude). I'm passionate about driving technical innovation while maintaining a strong focus on business outcomes and team development.
Featured Projects
A selection of my recent work and personal projects
AI-Powered Sales CRM & Call Centre
Built scalable CRM with Twilio-powered call centre, AI transcription and analysis using OpenAI. Increased customer conversions by 25% through automated workflows.
Price Comparison Platform
Architected contract management solution with automated workflows, real-time price comparisons, and Experian credit check integration for compliance.
Cloud-Native Medical Data Platform
Led development of highly available, serverless platform for clinical data collection with end-to-end encryption and GDPR compliance.
Data Lakehouse Architecture
Designed secure Data Lakehouse for patient data with SCD Type 2 data warehouse, ensuring healthcare compliance and real-time analytics.
Professional Experience
14+ years in software development and technology leadership
Chief Technology Officer
Watt.co.ukLeading development teams, ensuring efficient delivery, code quality, and secure cloud infrastructure.
- Built scalable customer data pipelines and centralised SCD Type 2 data warehouse
- Architected sales CRM with Twilio-powered call centre, boosting conversions by 25%
- Implemented AI-powered call recording, transcription, and analysis with OpenAI
- Created compliance workflow with Experian credit checks and automated submissions
Technical Lead
VitaccessLed development of a highly available, cloud-native platform for medical data using serverless strategies.
- Managed hiring, cost estimates, documentation, and compliance
- Developed clinical survey apps with microservices and end-to-end test suite
- Designed secure Data Lakehouse for patient data ensuring compliance
- Architected localization API with Wordbee and GraphQL
Full-Stack Web Developer
AFerryDeveloped and maintained web applications using modern frameworks and cloud technologies.
- Built responsive web applications with React and Node.js
- Implemented RESTful APIs and microservices architecture
- Collaborated with cross-functional teams in agile environment
Full-Stack Web Developer
New OrbitContributed to client projects and internal product development.
- Developed features for multiple client applications
- Worked with modern JavaScript frameworks and cloud services
- Participated in code reviews and technical documentation
Earlier Experience (2011-2018)
Skills & Technologies
Technologies I work with on a daily basis
Current Stack
Cloud & Infrastructure
Data & AI
Languages & Frameworks
Latest Articles
Thoughts on development, technology, and career growth
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Let's Work Together
I'm always interested in hearing about new opportunities and exciting projects.
Currently available for freelance projects and consulting