Senior Backend Developer | Nest.js, Node.js, PostgreSQL

Project Overview I'm looking for an experienced Senior Backend Developer to help investigate and resolve scaling issues in a digital asset custody wallet system. Requirements Strong backend development experience and knowledge of scalable system architecture. Experience building and optimizing high-performance backend services. Solid understanding of fintech systems and financial transaction processing. Hands-on experience with double-entry ledger systems and maintaining financial data consistency. Scope of Work The initial task is to investigate the existing system, identify potential bottlenecks, and recommend or implement targeted fixes. I'm looking for someone who can analyze the root cause of problems and propose practical, reliable solutions. Budget: $20 for the initial task. Please briefly describe your experience with digital wallets, financial ledgers, and backend scalability when submitting your proposal.