Full-Stack Product Engineer (React/Next.JS + AI Infrastructu at Crost AI

Strong professional experience with React, Next.js, TypeScript and modern JavaScript.
Experience building and debugging production web applications and customer-facing user flows.
Ability to investigate difficult issues across frontend code, APIs, backend services, browser behavior and third-party integrations.
Node.js experience and an understanding of REST APIs, databases, authentication and server-side application behavior.
Experience writing automated tests, preferably with Playwright or another end-to-end browser-testing framework.
Experience with product analytics, session replay, error tracking or production-monitoring tools.
Practical Linux, Docker, Git and CI/CD experience.
Experience working with e-commerce applications, carts, checkout flows, payments or related integrations.
Regular, effective use of AI development tools such as Codex, Claude Code, Cursor or similar systems.
Ability to understand, test and verify AI-generated work rather than accepting it without review.
Strong problem-solving, written communication and documentation skills.
Able to work independently while communicating clearly with a small founder-led team.
Fluent professional English.
Available approximately 40 hours per week with at least four daily hours overlapping Eastern Time.
Comfortable beginning with a paid technical trial before transitioning into a long-term role.

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