• Code Audit: Analyze the codebase for performance issues.
• Database Optimization: Optimize database queries and schema.
• Front-End Optimization: Implement techniques like code splitting, lazy loading, and image optimization.
• Scaling: Implement a scaling strategy for our back-end services.

Required Experience:

At least 4+ years of experience in full-stack or backend development. The freelancer must have a proven track record of successfully optimizing high-traffic web applications.

Required Expertise:

• Deep expertise in web performance optimization.
• Strong knowledge of database query optimization.
• Experience with front-end performance tools (Webpack, Lighthouse).
• Proficiency in a backend framework (e.g., Node.js, Ruby on Rails, Django).

Sample Work Required:

Please provide a case study or a report from a past performance optimization project, detailing the issues identified, the solutions implemented, and the performance improvements achieved.

Freelancer Proposal: 

The freelancer should submit a detailed technical proposal outlining their approach to the performance audit, the specific areas they will focus on, and a phased plan for implementation.