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Denis Boyko

@denisboyko

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Senior Full-Stack Engineer at Flora Co., Ltd. building Stripe subscription systems and conversion funnels.

Poland

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At Flora Co., Ltd., I develop web applications for subscription products and conversion-focused funnels. I built marketing funnels with React, Next.js, and TypeScript, and implemented Stripe checkout, payment flows, webhooks, and subscription lifecycle management.

I also developed backend services and REST APIs using Node.js, Firebase, Strapi, and PostgreSQL. By optimizing Core Web Vitals, I reduced page load time by about 35%.

Previously, at DigitalSuits, I developed headless e-commerce applications using React, Next.js, Strapi, and Shopify. On a project with more than 7,000 products, I helped reduce build time by about three times.

Experience

Work history, roles, and key accomplishments

Current

Senior Full-Stack Engineer

Current

Flora Co., Ltd

Jun 2023 - Present (3 years 4 months)

Developed and scaled high-performance web applications for international clients, primarily in subscription-based products and conversion-focused funnels using React, Next.js, TypeScript, and Node.js.

Owned the full development lifecycle — from architecture and implementation to testing, performance optimization, deployment, and production support.

Key impact:

• Built high-conversion marketing

Middle Frontend Developer

DigitalSuits

Jun 2021 - Jun 2023 (2 years)

Developed and maintained headless e-commerce applications for international clients using React, Next.js, TypeScript, Strapi, and Shopify, with a focus on performance, scalability, SEO, and conversion optimization.

Worked on multiple e-commerce projects, including large-scale online stores with 7,000+ products.

Key impact:

• Built and maintained headless e-commerce solutions using React, Nex

Junior Frontend Developer

Stradasol

Sep 2019 - May 2021 (1 year 8 months)

Started professional career building landing pages and small-scale web applications, focusing on frontend development fundamentals and UI implementation.

Gained hands-on experience working with modern JavaScript frameworks and delivering production-ready interfaces.

Key contributions:

Developed UI components using JavaScript and React
Converted design mockups into responsive, production-ready w