Roman Leinwather

Product Designer

• Led growth-focused design initiatives across Toptal’s digital platforms, driving user acquisition and engagement
• Redesigned and optimized the signup flow, increasing sign-up conversion rates
• Collaborated cross-functionally with marketing teams and content strategists to deliver cohesive brand experiences across all digital touchpoints
• Planned and conducted usability testing sessions and translated findings into actionable design improvements
• Built interactive Figma prototypes to validate concepts early and accelerate stakeholder feedback cycles

Product Designer / Front-End Developer

• Ranked within the top 3% of design talent on the Toptal network for three consecutive years
• Delivered end-to-end design projects for global clients including Google, NATO, AVG, Estée Lauder, and Qustodio
• Designed user interfaces and user experiences in Sketch and Figma, specializing in UI design, UX design, and product design for web and mobile
• Managed complete project lifecycles independently, from discovery and wireframing to high-fidelity design and delivery

Designer

• Designed digital campaigns and websites for high-profile clients including 10 Downing Street, ITV, HSBC, and Amy Winehouse
• Produced visual designs in Adobe Photoshop and implemented them in PHP, HTML, CSS, and JavaScript

Web Designer

• Designed the Student’s Book web portal serving university students across the United Kingdom
• Developed the front end using ColdFusion, HTML, CSS, and JavaScript

Web Designer

• Designed web applications, websites, and advertising campaigns in Adobe Photoshop and Adobe Illustrator
• Built front-end code with HTML, CSS, and JavaScript

• Designed and built an AI-driven sports betting analyzer that predicts match outcomes by comparing live betting data against historical datasets
• Project link

• Designed and developed a custom forex trading indicator for TradingView and an algorithmic trading bot for the cTrader platform, built with the Claude AI model

• Built a location-aware map application using the Claude AI model to surface discounted offers near the user
• Project link

• Designed and shipped a live macroeconomic dashboard aggregating 15 open-source data sources, powered by Claude AI models
• Project link

• Designed and built a live Prague public-transport dispatcher map that plots every tram, metro, bus, train, and ferry in real time, with a delay-zone heatmap and installable PWA for iOS and Android
• Project link

• Designed and developed Awra, a health and wellness mobile application for iOS and Android
• Built the awra.info website on the Paperclip agent-driven framework, enabling automated content creation by AI agents
• Project link

• Created and published an 11-hour application design course on Udemy, covering web, mobile, and tablet design from zero to professional level
• Project link

• Designed and developed a Czech online marketplace connecting clients with lawyers, accountants, and financial experts, built with PHP, HTML, CSS, and JavaScript

• Designed and developed a project management platform built on Ruby on Rails and AWS infrastructure (EC2, S3)

Design

CIW in Design and Computer Programming