Frontend Engineer

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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