Building financial system for a superstore

We are looking for a developer to Design and build a massively scalable back-end system and assist in developing the project architecture. You need to Build and maintain server code bases. Collaborate with client-side developers and the content team. Identify and resolve issues with the security and reliability of back-end systems. You need experience developing the large-scale backend system for real-world applications, strong knowledge of blockchain eg. Bitcoin, Ethereum, Ripple, etc., experience with frontend- React + NextJS + HTML + CSS, Ruby, Rails, Docker, Postgres, Backend- Node + Express + MongoDB or MySQL + Redis, XRPL etc .. almost covering all frameworks and libraries. You should be comfortable wandering around unexplored application/game design / virtual world territory, and excited to contribute to refining ideas. You must collaborative mindset and the ability to communicate effectively. You should history of building financial systems, security systems, or other systems where a high degree of dependability is critical.