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 AI integrations with 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