Description

I'm a Full-Stack Developer and independent contractor with over 7 years of hands-on experience in web and mobile development. I build high-performance, scalable, and secure digital products for startups, agencies, and businesses across Europe.

My tech stack includes JavaScript, TypeScript, React, Node.js, Supabase, Firebase, and Flutter – enabling me to deliver modern frontend experiences and robust backend logic. I specialize in automation systems, payment integrations, APIs, dashboards, and clean UI/UX.

Clients value me for reliability, speed, and clear communication. I work remotely, speak fluent English and Polish, and I’m ready to help you launch your MVP, upgrade your stack, or scale your product fast.

Let’s create something great together.

Languages

Polish
Native or bilingual
German
Conversational
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Sontix
Full-Stack Developer
January 2023 - Today (3 years and 5 months)
Developed complete payment and automation systems using React, Node.js, Supabase, and Stripe.
Built a modern, scalable frontend and secure backend infrastructure. Focused on clean UX/UI, mobile responsiveness, and API integration for financial workflows.
Supabase Stripe TailwindCSS Node.js React
Sontix
Full-Stack Developer / Independent Contractor
January 2020 - Today (6 years and 5 months)
• Building modern web applications and websites for small & medium businesses
• Specializing in Next.js/React/TypeScript with SEO and performance optimization
• Created API-driven solutions with Node.js, Supabase, and Firebase
• Developed cross-platform mobile apps with Flutter and push notifications
• Worked on blockchain solutions including token transactions and private chains
• Implemented business automation systems with booking forms, CRM integration, auto-emails & invoices
• Integrated payment systems (Stripe, Revolut) for SaaS and e-commerce
• Optimized apps for performance, SEO, and mobile responsiveness achieving 95+ Lighthouse scores

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Pawel Krawczyk

Full-Stack Developer / Independent Contractor

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