Stephan Leece
@stephanleece1
Senior Frontend Engineer specializing in React + TypeScript design systems and experimentation infrastructure.
GermanyWhat I'm looking for
I’m a Senior Frontend Engineer with 7+ years of experience building high-performance React and TypeScript applications at growth-stage and enterprise companies. I specialise in component architecture, design systems, and experimentation infrastructure—shipping features that move metrics.
I thrive on both deep technical problem-solving and cross-functional collaboration with product and design. As an active contributor to engineering culture, I’m equally comfortable raising the bar on TypeScript quality and developer experience as I am delivering user-facing UI capabilities.
In my most recent roles, I architected and delivered a new Rich Text Editor using Lexical, consolidating legacy implementations into a single maintainable solution across micro-frontends. I also built complex UI features while maintaining full WCAG compliance and performance budgets for hundreds of enterprise customers, including multiple Fortune 500 companies.
I’ve also owned experimentation and quality at scale—optimising image delivery to improve Core Web Vitals, running A/B experiments that informed roadmaps, and introducing structured QA/mob-testing to reduce manual testing time and regression bugs. Today, I lead an AI-augmented development curriculum and mentor learners and engineers through career transitions.
Experience
Work history, roles, and key accomplishments
Tech Education Lead
ReDI School
Jun 2025 - Present (1 year)
Building an AI-augmented development curriculum rated 97% by learners, focused on practical real-world AI workflows. Led programs for 2,400+ students and 500+ volunteer instructors across Europe and ran sprint ceremonies for teams and volunteers.
Architected and delivered a new Rich Text Editor with Lexical, consolidating 3 legacy implementations into a single maintainable solution for the micro-frontend ecosystem. Shipped WCAG-compliant UI features (inline messaging, resizable components) to hundreds of enterprise customers, including multiple Fortune 500 companies.
Instructor (Frontend)
ReDI School
Feb 2018 - Jan 2025 (6 years 11 months)
Taught frontend web development (HTML, CSS, responsive design) to ~25 learners per class from underrepresented backgrounds entering tech. Mentored cohorts through career transitions into software roles and provided technical coaching and job search support for years.
Optimized the image delivery pipeline, reducing frontend bundle size by 10% and improving Core Web Vitals. Owned 10+ end-to-end A/B experiments to inform roadmap decisions, and reduced manual testing time by ~25% while cutting regression bugs by 40% through structured QA and mob-testing.
Built a CMS-driven landing page generator, cutting marketing page launch time from days to minutes and powering 100+ live pages still in use. Ran 10+ growth experiments with product, design, and marketing to improve experimentation cadence.
Built and maintained key frontend surfaces for Grover's consumer product, helping support the company's rapid growth phase. Developed growth engineering fundamentals across experimentation and conversion optimization at the intersection of product and marketing.
Joined as a junior engineer and quickly earned promotion to Software Engineer within 13 months through consistent frontend delivery. Contributed to Grover's core product frontend and built strong proficiency in React and modern JavaScript in a fast-moving startup environment.
Education
Degrees, certifications, and relevant coursework
SPICED Academy
Full-Stack Web Development Bootcamp, Full-Stack Web Development
2017 -
Completed a Full-Stack Web Development Bootcamp in Berlin in 2017.
The Open University
Bachelor of Science (Honours), Computing and IT (Software)
Completed a BSc (Honours) in Computing and IT (Software) in 2022.
Tech stack
Software and tools used professionally
Availability
Location
GermanyAuthorized to work in
Job categories
Skills
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