Experienced Backend Engineer Needed for [SaaS Platform / Mobile App Backend]

About the Role: We are seeking a talented Backend Developer to architect and build the backbone of our application. We are less concerned about specific languages and more concerned about your understanding of system design, database optimization, and security. What You Will Do: Architect and develop robust backend services. Manage database design and optimization for high-volume data. Create clean, well-documented APIs for our mobile and web frontends. Ensure system security and data integrity. Collaborate with the founder/product manager to translate requirements into technical solutions. What We Are Looking For: 5+ years of professional backend development experience. Deep understanding of System Design and Design Patterns. Strong experience with SQL (PostgreSQL/MySQL) and NoSQL databases. Experience deploying and managing apps on AWS (EC2, S3, Lambda) or similar. Experience with caching mechanisms (Redis/Memcached). Strong unit testing and debugging skills. Nice to Have: Experience with DevOps (Docker, Kubernetes). Previous experience working in a startup environment. How to Apply: Please answer the following screening questions in your proposal: Describe the most complex backend architecture you have built. What made it complex? How do you handle database migrations in a production environment? What is your hourly rate and weekly availability?