Rock&Apps is looking for a Middle Frontend Developer 🚀
We are looking for a Middle Frontend Developer to join our team and work on web products with a strong focus on payment flows, integrations, and conversion funnels.
Location: Warsaw
Job Type: Full-time, office
Seniority: Middle
What you’ll do
Develop and maintain payment funnels using React, TypeScript, Vite, and Next.js, including Apple Pay via Primer, Stripe, Solid, upsells, retries, and decline handling.
Integrate web funnels with iOS applications via WKWebView, including JS ↔ native event bridge communication.
Build and launch landing pages, websites, and multi-domain projects for paid traffic; work with Cloudflare and support fast deployments.
Design and implement product analytics events across funnels and identify and eliminate tracking gaps.
Diagnose production issues such as passrate drops, SDK timeouts, and stuck loaders using logs and event CSV data.
Conduct code reviews, mentor junior developers, and maintain documentation for payment integrations.
What we’re looking for
3+ years of commercial Frontend Development experience.
Strong knowledge of React, TypeScript, and Next.js.
Experience integrating at least one PSP through a custom payment flow (Stripe Elements/Payment Intents, Primer, Solid, Adyen, or similar), rather than only using hosted checkout solutions.
Experience with Apple Pay on the Web, including merchant validation, domain configuration, and WebView limitations.
Experience working with WebView in mobile applications, including postMessage / WKScriptMessageHandler.
Ability to design and implement analytics events.
Extra points if you have
Understanding of paid traffic metrics such as passrate, refund rate, and paywall A/B testing.
Basic Node.js or PHP knowledge with the ability to independently create a simple endpoint when needed.
Previous mentoring experience.
What We Offer
A fast-growing environment with minimal bureaucracy and space for your ideas.
Opportunities for professional development and career growth.
18 paid vacation days.
10 paid days off.
Benefit Bar — choose the benefits that matter most to you.
A comfortable, well-equipped office with everything you need for a productive workday.
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