Stefan Heymanns

Senior Software Engineer

San Jose, California, United States22 yrs 11 mos experience
Most Likely To SwitchHighly Stable

Key Highlights

  • Over 20 years of experience in front-end architecture.
  • Expertise in building accessible user-centered interfaces.
  • Strong leadership in cross-functional engineering initiatives.
Stackforce AI infers this person is a Frontend Engineering Leader in the Media and Fintech industries.

Contact

Skills

Core Skills

Front-end DevelopmentWeb AccessibilityUser Experience

Other Skills

JavaScriptTypeScriptWeb ApplicationsAccessibilityReactHTMLCSSArtificial Intelligence (AI)AJAXPHPHTML 5MySQLWeb 2.0GitXML

About

Senior Engineering Leader | Front-End Architecture & Design Systems | Accessibility Champion | Thoughtful Adoption of Emerging AI Technologies Senior engineering leader with more than two decades of experience in front-end architecture, design systems, and the delivery of accessible, user-centered interfaces. Demonstrated history of guiding engineering teams, establishing UI frameworks, and executing large-scale, cross-functional initiatives with a consistent focus on clarity, maintainability, and high-quality product execution. Professional interests include the emerging influence of AI and multimodal technologies on product design, creative tooling, and engineering workflows. Incorporates AI-assisted exploration, such as rapid prototyping, ideation support, and development acceleration, as a complementary enhancement to established engineering practices. Maintains a measured and evidence-based approach to evaluating and integrating new technologies. Particularly engaged by organizations operating at the intersection of creative innovation and rigorous engineering, and by opportunities to help shape intuitive, elegant user experiences in forward-looking product environments. Offers mature technical leadership, deep front-end expertise, and a refined perspective on the craft of building high-quality, globally inclusive interfaces. Specialties: UI Architecture, JavaScript/TypeScript, React, GraphQL, Design Systems, Web Accessibility Californian by choice. Schwarzwälder at heart.

Experience

22 yrs 11 mos
Total Experience
3 yrs 6 mos
Average Tenure
12 yrs 7 mos
Current Experience

Netflix

3 roles

Senior Software Engineer - Core Payments

Jun 2025Present · 11 mos · On-site

  • Senior Engineer — Payments Platform
  • Built and optimized payment integrations across browser, mobile, and TV platforms, ensuring reliable and consistent user experiences at scale.
  • Integrated with a broad range of third-party payment providers worldwide, addressing regional requirements and compliance considerations.
  • Executed the migration of the payment UI to a modern, server-driven architecture to improve performance and maintainability.
  • Conducted A/B testing and analysis of payment flows to drive conversion improvements and operational efficiency.
JavaScriptTypeScriptWeb ApplicationsAccessibilityFront-end DevelopmentWeb Accessibility

Senior Software Engineer - TUDUM/House

Feb 2022Jun 2025 · 3 yrs 4 mos · On-site

  • Senior Engineer - Editorial & Experiences Platforms
  • Architected, built, and maintained the new Netflix editorial site TUDUM, guiding the platform from initial launch to more than 20M monthly visitors.
  • Delivered custom, interactive, and high-visibility marketing experiences used across global campaigns.
  • Architected and developed the new informational and commerce site for Netflix House, including integrations with internal payment systems, external payment providers, and third-party ticketing platforms.
ReactJavaScriptWeb ApplicationsAccessibilityFront-end DevelopmentUser Experience

Senior Software Engineer - Member WebUI

Oct 2013Feb 2022 · 8 yrs 4 mos · On-site

  • Senior Engineering Lead for the Website UI team.
  • Oversaw the end-to-end Website UI technology stack, driving improvements in performance, accessibility, internationalization, experimentation, and release processes. Led cross-functional engineering efforts across the organization, coordinating stakeholders and delivering high-visibility, company-wide initiatives.
JavaScriptHTMLCSSAccessibilityFront-end DevelopmentWeb Accessibility

Wellfurnished

Front-End Developer

Jan 2012Jul 2013 · 1 yr 6 mos

Stanford university

Senior Front-End Web Developer

Mar 2010Oct 2013 · 3 yrs 7 mos · Palo Alto

Yahoo! inc.

Front End Application Developer

Oct 2007Mar 2010 · 2 yrs 5 mos · Sunnyvale

  • My Yahoo! and Yahoo! Finance
  • Develop standard compliant, semantic HTML and CSS and implement object-oriented JavaScript for Web 2.0 personalized homepage.
JavaScriptHTMLCSSFront-end Development

Symantec

Web Developer

Sep 2005Oct 2007 · 2 yrs 1 mo · Cupertino

Binz hoch3 gmbh

CAD/CAM Engineer

Aug 1999Dec 2000 · 1 yr 4 mos

  • Production of 3D CAD Models for the Automobile and Aerospace Industry. Contracted mainly by the Robert Bosch company. Developed next generation windshield wiper motors and blades.

Up with people

Production Technician

Jul 1998Jun 1999 · 11 mos

  • Production and Operations Technician for the European tours of Casts A'98 and E'98, touring 70 cities in 10 countries.
  • Member of a 18 person staff, ensuring education and safety for approx. 150 students.

Education

San Francisco State University

BS — Computer Science

Jan 2001Jan 2006

Gymnasium am Romäusring, Villingen-Schwenningen, Germany

Abitur

Jan 1986Jan 1995

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