Kamil Dzieniszewski

Senior Frontend Developer | NextJS | React | TypeScript | meetJS Warsaw | AI Devs

Warsaw, Mazowieckie, Poland

About

High-impact Frontend Leader with 12+ years of experience in architecting complex web ecosystems (React, Next.js, micro-frontends). Pioneer in AI-assisted development workflows, significantly accelerating delivery cycles. Proven track record in scaling engineering teams and building technical communities. Co-creator of popular tech media (YouTube) and speaker at major conferences like JS Poland.

Experience

  • Lead Frontend Developer at Playsmart.io
    Nov 2025 - Apr 2026 · 6 mos

    ● Architected and delivered two high-performance iGaming platforms (spinni.com, pelaanyt.com) for the Nordic markets using a modern tech stack.  ● Pioneered AI-native development workflows (utilizing Cursor IDE, CodeRabbit, and Anthropic Sonnet and Opus models), resulting in a 100% increase in feature delivery speed.  ● Led and mentored a team of engineers, ensuring high code quality through rigorous code reviews and architectural guidance.  ● Optimized UI rendering performance, significantly improving Core Web Vitals and user retention metrics.

  • Developer Advocate at Tolgee
    Aug 2025 - Oct 2025 · 3 mos

    ● Transformed community engagement by migrating the developer support ecosystem from Slack to Discord, fostering a more interactive contributor environment.  ● Redesigned and re-authored comprehensive developer documentation and SDK guides (iOS/Android), reducing support tickets by 60%.  ● Acted as a technical bridge between the community and the core product team, translating user feedback into actionable product features.

  • Frontend Developer at LEOCODE - Your Tech Partner
    Feb 2025 - Jun 2025 · 5 mos

    ● Transformed community engagement by migrating the developer support ecosystem from Slack to Discord, fostering a more interactive contributor environment. ● Redesigned and re-authored comprehensive developer documentation and SDK guides (iOS/Android), reducing support tickets by 60%. ● Acted as a technical bridge between

  • Senior Frontend Developer at Lighthouse Growth
    Oct 2024 - Jan 2025 · 4 mos

    ● develop Lighthouse Growth website ● work for Telia client as a Next.js developer, rewriting old pages into Next.js (Search and Category)

  • Frontend Developer at AirHelp
    May 2024 - Sep 2024 · 5 mos

    ● Implemented RTL/LTR-compatible UI components, including support for Arabic localization and layout handling  ● Developed new authentication and login flows and contributed to CRM integration efforts across the platform