Secure Web-Based Classifieds Development

I'm seeking an experienced developer to create a secure, intuitive, and high-performance web-based classifieds platform. This application will allow users to effortlessly post, search, and purchase a variety of goods and services, including cars, real estate, and household appliances.

Key Features Needed:
- User-friendly interface for posting and searching listings
- Secure transaction process with two-factor authentication for user safety
- High-performance, category-based search functionality
- Clearly defined categories for cars, real estate, and household appliances

Ideal Skills and Experience:
- Proven experience in developing secure web applications
- Expertise in building high-performance search functionalities
- Prior work in classifieds or similar marketplaces is a plus

Please provide examples of similar work done and an estimated timeline.