Fractional CTO & engineering leadership
Senior technical direction without a full-time hire. Architecture, roadmaps, hiring, and straight answers on what to build.
What I do
ServicesCheckout & payments consulting
Conversion-critical flows done properly, with checkout and payments experience from JPMorganChase, Bolt and Fast.
Custom software development
Web-first, fullstack delivery. Prototype to production, built to be maintained and not just shipped.
Team leadership & delivery
I've led British, European and international teams on multi-million pound projects. I can lead yours or level it up.
Track record
The person you'd hire, if you could.
I'm Rhys Stewart, a staff-level engineer and engineering leader. I led checkout projects and the UK engineering group at JPMorganChase, directed web at Bolt, and built commerce platforms used by millions. Frontend specialist, fullstack in practice, strong AI capabilities.
11Ten is how you get that experience on your project, without a six-month search.
LinkedIn
15 yrs
Building software
£MM+
Project budgets led
VP / Director
JPMorganChase, Bolt
UK, EU, Intl
Teams led
Toolbox
Capabilities
Languages & frameworks
TypeScriptJavaScriptReactNext.jsReact NativePreactGraphQLSQLHTML5CSS3
Platforms & tooling
AWSREST & gRPCGitHub Actions, CI-CDVitePlaywrightVitestJestStorybookDatadogFigma
Data & mobile
PostgreSQLMySQLMongoDBIndexedDBiOS, Android, RN SDKs
AI & developer tooling
Claude & Claude CodeCursorDevinMCP setupAI-augmented CI/CDCodeRabbitGitHub Copilot
Domain experience
Payments & checkoutIdentityGDPR & i18nRegulated financial servicesSaaS & recruitment techMedia & creator tools
Leadership & delivery
Distributed team leadershipTechnical strategyHiring & mentoringDesign-system governanceRoadmap & delivery