
John Robert Naumann
Verified Expert in Engineering
UI Developer
Frankfurt, Hesse, Germany
Toptal member since February 1, 2017
John is a senior software engineer with 10+ years of experience architecting scalable web and native products for both high-growth startups and global enterprises. He specializes in building robust design systems, integrating AI-driven features, and optimizing performance-critical frontends. Beyond code, John is passionate about mentoring engineers, bridging the gap between design and engineering, and delivering seamless user experiences that drive measurable business growth.
Portfolio
Experience
- React - 10 years
- Interaction Design (IxD) - 10 years
- User Interface Engineering (UIE) - 10 years
- Adobe CC - 10 years
- User Interface (UI) - 10 years
- Information Design - 10 years
- UI Animation - 10 years
- Storybook - 10 years
Preferred Environment
JavaScript, React, Next.js, Storybook, TypeScript, Flutter, React Native, Node.js, Vercel
The most amazing...
...thing I've done is work with Unmade to build online digital tools for creating knitwear.
Work Experience
Senior UI Developer
Schimel Associates Corp DBA Mission Control Marketing
- Conducted rapid prototyping of a health insurance metrics dashboard to support client funding rounds.
- Developed a proof of concept for an animated charting approach used in modern dashboard interfaces.
- Contributed to successful client engagement efforts that helped secure project acquisition and funding for delivery.
Senior UI Developer
Epipheo
- Created a framework for an animation house to take videos and other interface elements to export as embedded applications.
- Led the design and implementation of a scalable component and motion system, enabling designers and engineers to rapidly prototype and ship interactive experiences with consistent animation patterns across web and embedded platforms.
- Established an end-to-end pipeline for transforming creative assets into production-ready applications, aligning design tooling, build processes, and deployment workflows to reduce handover friction.
Senior UI Developer
AlphaSeeker AI
- Led the evolution of financial analysis products from early prototypes through to successful initial funding rounds, shaping both the technical architecture and product narrative for investors.
- Designed and implemented real-time, AI-driven charting systems, leveraging WebSocket data streams on Google Cloud Platform to deliver low-latency, live financial insights.
- Pioneered advanced AI-assisted development workflows using Cursor, significantly accelerating the prototyping and iteration of complex financial analysis applications.
Senior UI Developer
Studio Untitled
- Architected immersive, motion-heavy web experiences using Next.js and GSAP, ensuring smooth 60fps transitions and interactive storytelling across high-end lifestyle and luxury brand portfolios.
- Developed custom, modular front-end components integrated with Sanity.io/Contentful, enabling creative teams to manage complex visual layouts and rich media assets with zero developer intervention.
- Optimized heavy-asset rendering through advanced WebGL and lazy-loading techniques, maintaining sub-second "Time to Interactive" scores while delivering high-fidelity, cinema-grade digital content.
Senior React Developer
CAG Regional Singapore
- Engineered a high-throughput integration layer in Node.js to aggregate real-time rates for credit cards, personal loans, and insurance from 30+ banking partners across SE Asia via REST and SOAP APIs.
- Developed a dynamic recommendation engine using React and TypeScript that leverages user-provided financial profiles to rank products based on eligibility, increasing lead-to-approval rates by 22%.
- Architected a localized headless CMS (Contentful/Strapi) deployment to manage financial education content across five markets, ensuring sub-second page loads and optimized SEO for millions of monthly users.
Senior UI Developer
Elo Touch Solutions
- Leveraged the Elo Device SDK and Android's specialized BSP to build custom kiosk applications, integrating hardware peripherals like barcode scanners and payment terminals via JavaScript and native Java APIs.
- Automated the deployment of APKs and system configurations to 1,000+ devices using EloView’s cloud APIs, reducing onsite provisioning time through zero-touch setup and remote OS management.
- Engineered responsive, tamper-proof user interfaces for Elo I-Series touchscreens, utilizing "Single App Mode" and custom Home Launchers to ensure 24/7 uptime in high-traffic retail and industrial environments.
Senior Front-end Developer
Composer Technologies
- Engineered a real-time data engine using Clojure to normalize and overlay multiple ETF price feeds, enabling seamless side-by-side performance comparisons of complex "Symphony" strategies.
- Developed a responsive UI using Next.js and D3.js to visualize cumulative returns and drawdowns, allowing users to toggle risk metrics across 10+ tickers without latency or UI lag.
- Built a Python-based back end to calculate and stream Sharpe ratios and Alpha/Beta metrics via WebSockets, ensuring charts update instantly as users modify strategy logic or swap assets.
Senior Front-end Developer
Electric Lime Films
- Architected and implemented a dynamic content structure to showcase global offices, directors, projects, and culture stories, enabling the site to scale as electriclime° expanded its international footprint.
- Designed and deployed an interactive project portfolio UI, allowing seamless browsing of film and commercial work with rich visual previews and categorization by director, region, and production type.
- Optimized the site’s editorial workflow and CMS integration, empowering the creative team to publish culture updates, facilitation details, and W13 content updates without developer support, improving content velocity.
Senior Front-end Developer
Third Street Data
- Engineered a referral discovery engine using Python and Neo4j to map 500+ million employee connections, leveraging graph algorithms to identify "warm" paths to passive talent and increase referral-to-hire conversion rates.
- Developed an AI-driven search interface using OpenAI’s GPT-4 and vector embeddings (Pinecone/Milvus) to replace rigid Boolean logic with natural language queries, improving diversity sourcing accuracy by 35%.
- Architected a robust synchronization layer with Ruby on Rails and Webhooks to integrate with 40+ ATS platforms (Greenhouse, Lever, etc.), ensuring real-time data consistency and automated candidate status updates.
Experience
Composer Trade
Teamable
https://www.teamable.com/Epipheo
https://epipheo.com/Elo Touch
https://www.elotouch.com/Electric Lime Films
https://www.electriclime.film/Education
Bachelor's Degree in Visual Communication
Leeds University - Leeds, United Kingdom
Skills
Libraries/APIs
React, HTML5 APIs, Vue, Google Maps API, WordPress API, GSAP, Node.js, React Testing Library, Shopify API, HTML5 Canvas
Tools
Git, Figma, Adobe CC, GitHub, Expo, Front-end Build Tools, Bower Front-end Dependency Manager, Bitbucket, Jira, Confluence, Articulate Storyline, Adobe Captivate, Camtasia, Lighthouse, Pardot
Languages
JavaScript, CSS, HTML, TypeScript, PHP
Frameworks
Jest, Next.js, Tailwind CSS, Material UI, React Native, Flutter, Nuxt.js, Angular
Paradigms
UI Design, REST, Responsive Web Design (RWD), Interface Design, DevOps, UX Design
Platforms
WordPress, GreenSock Animation Platform (GSAP), Vercel, Shopify, Visual Studio Code (VS Code), Google Cloud Platform (GCP), Linux, Drupal, Joomla, Magento, Webflow, Craft CMS
Storage
WP Engine, Google Cloud
Industry Expertise
Web Design
Other
Information Design, UI Development, User Interface (UI), User Interface Engineering (UIE), HTML5 Video, Content Management Systems (CMS), Proof of Concept (POC), Front-end, Tailwind UI, Cursor AI, UI Components, Vite, Storybook, UI Animation, APIs, Interaction Design (IxD), SVG, User Experience (UX), Mobile UI, Accessibility, Framer, Server-side Rendering (SSR), Processing.js, 2D, SVG Animation, AI Research, UI Research, GitHub Copilot Chat, SEO Tools, Responsive Design, eCommerce
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