Denis Semenov is a Founder & CTO and frontend specialist with a decade of experience crafting high-performance, user-centered web applications using JavaScript/TypeScript and modern frameworks like React, Vue, Next.js and Nuxt.js. He combines enterprise-grade discipline from CROC—where he built a UI component library and sped development by 80%—with a prolific freelance portfolio delivering pixel-perfect, SEO-optimized Next.js storefronts and bespoke CMS solutions. Denis bridges product, UX and marketing analytics to design interfaces that drive engagement and business outcomes, and he also operates the AI-driven parenting startup Arkie, applying behavioral design and gamification to real-world well-being. Comfortable across SPA, SSR, SSG and JAMstack architectures, he handles frontend architecture, performance tuning and CI/CD while maintaining hands-on development and occasional server administration. Colleagues value him for turning tight deadlines into demonstrable demos and for shipping pragmatic tools that scale from prototypes to commercial products.
10 years of coding experience
12 years of employment as a software developer
Specialist, Marketing, Specialist, Marketing at Russian State University for the Humanities
General Secondary Education, Economics, Marketing, Commerce and Mathematics, General Secondary Education, Economics, Marketing, Commerce and Mathematics at Lyceum 26 (Podolsk, Russia)
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Denis Semenov - Founder & CTO at Freelance | Self-Employed