A memcache developer designs, implements, and maintains applications using Memcached, a high-performance, distributed memory object caching system. They optimize data retrieval for large-scale web applications by reducing database load. They handle data serialization/deserialization and ensure data consistency across multiple servers. They also troubleshoot issues, improve system performance, and ensure seamless cache invalidation. Furthermore, they monitor cache hit ratios and tweak configurations for optimal performance. They often work closely with other software developers to integrate Memcached into application code, providing a faster user experience by caching frequently accessed data in memory.