diff --git a/apps/api-server/internal/cache/cache.go b/apps/api-server/internal/cache/cache.go
new file mode 100644
index 0000000..1bed574
--- /dev/null
+++ b/apps/api-server/internal/cache/cache.go
@@ -0,0 +1,412 @@
+package cache
+
+import (
+	"encoding/json"
+	"fmt"
+	"sync"
+	"time"
+)
+
+// CacheItem represents an item in the cache
+type CacheItem struct {
+	Key         string    `json:"key"`
+	Value       any       `json:"value"`
+	Expiration  time.Time `json:"expiration"`
+	CreatedAt   time.Time `json:"created_at"`
+	AccessCount int64     `json:"access_count"`
+	LastAccess  time.Time `json:"last_access"`
+}
+
+// IsExpired checks if the cache item has expired
+func (ci *CacheItem) IsExpired() bool {
+	return time.Now().After(ci.Expiration)
+}
+
+// Cache interface defines the cache operations
+type Cache interface {
+	Get(key string) (any, bool)
+	Set(key string, value any, ttl time.Duration)
+	Delete(key string)
+	Clear()
+	Keys() []string
+	Size() int
+	Stats() CacheStats
+}
+
+// CacheStats provides cache statistics
+type CacheStats struct {
+	Hits       int64   `json:"hits"`
+	Misses     int64   `json:"misses"`
+	HitRate    float64 `json:"hit_rate"`
+	Size       int     `json:"size"`
+	Evictions  int64   `json:"evictions"`
+	TotalItems int64   `json:"total_items"`
+}
+
+// MemoryCache is an in-memory cache implementation
+type MemoryCache struct {
+	items       map[string]*CacheItem
+	mu          sync.RWMutex
+	stats       CacheStats
+	maxSize     int
+	cleanupTick *time.Ticker
+	stopCleanup chan bool
+}
+
+// NewMemoryCache creates a new memory cache
+func NewMemoryCache(maxSize int, cleanupInterval time.Duration) *MemoryCache {
+	cache := &MemoryCache{
+		items:       make(map[string]*CacheItem),
+		maxSize:     maxSize,
+		cleanupTick: time.NewTicker(cleanupInterval),
+		stopCleanup: make(chan bool),
+	}
+
+	// Start cleanup goroutine
+	go cache.cleanup()
+
+	return cache
+}
+
+// cleanup removes expired items from cache
+func (mc *MemoryCache) cleanup() {
+	for {
+		select {
+		case <-mc.cleanupTick.C:
+			mc.removeExpired()
+		case <-mc.stopCleanup:
+			return
+		}
+	}
+}
+
+// removeExpired removes expired items from cache
+func (mc *MemoryCache) removeExpired() {
+	mc.mu.Lock()
+	defer mc.mu.Unlock()
+
+	now := time.Now()
+	for key, item := range mc.items {
+		if now.After(item.Expiration) {
+			delete(mc.items, key)
+			mc.stats.Evictions++
+		}
+	}
+}
+
+// Get retrieves an item from cache
+func (mc *MemoryCache) Get(key string) (any, bool) {
+	mc.mu.RLock()
+	defer mc.mu.RUnlock()
+
+	item, exists := mc.items[key]
+	if !exists {
+		mc.stats.Misses++
+		return nil, false
+	}
+
+	if item.IsExpired() {
+		delete(mc.items, key)
+		mc.stats.Misses++
+		mc.stats.Evictions++
+		return nil, false
+	}
+
+	// Update access statistics
+	item.AccessCount++
+	item.LastAccess = time.Now()
+	mc.stats.Hits++
+
+	return item.Value, true
+}
+
+// Set stores an item in cache
+func (mc *MemoryCache) Set(key string, value any, ttl time.Duration) {
+	mc.mu.Lock()
+	defer mc.mu.Unlock()
+
+	// Check if we need to evict items to make space
+	if len(mc.items) >= mc.maxSize {
+		mc.evictLRU()
+	}
+
+	expiration := time.Now().Add(ttl)
+	item := &CacheItem{
+		Key:         key,
+		Value:       value,
+		Expiration:  expiration,
+		CreatedAt:   time.Now(),
+		AccessCount: 1,
+		LastAccess:  time.Now(),
+	}
+
+	mc.items[key] = item
+	mc.stats.TotalItems++
+}
+
+// evictLRU removes the least recently used item
+func (mc *MemoryCache) evictLRU() {
+	var lruKey string
+	var lruTime time.Time
+
+	for key, item := range mc.items {
+		if lruKey == "" || item.LastAccess.Before(lruTime) {
+			lruKey = key
+			lruTime = item.LastAccess
+		}
+	}
+
+	if lruKey != "" {
+		delete(mc.items, lruKey)
+		mc.stats.Evictions++
+	}
+}
+
+// Delete removes an item from cache
+func (mc *MemoryCache) Delete(key string) {
+	mc.mu.Lock()
+	defer mc.mu.Unlock()
+
+	delete(mc.items, key)
+}
+
+// Clear removes all items from cache
+func (mc *MemoryCache) Clear() {
+	mc.mu.Lock()
+	defer mc.mu.Unlock()
+
+	mc.items = make(map[string]*CacheItem)
+	mc.stats.Evictions += int64(len(mc.items))
+}
+
+// Keys returns all keys in cache
+func (mc *MemoryCache) Keys() []string {
+	mc.mu.RLock()
+	defer mc.mu.RUnlock()
+
+	keys := make([]string, 0, len(mc.items))
+	for key := range mc.items {
+		keys = append(keys, key)
+	}
+	return keys
+}
+
+// Size returns the current cache size
+func (mc *MemoryCache) Size() int {
+	mc.mu.RLock()
+	defer mc.mu.RUnlock()
+
+	return len(mc.items)
+}
+
+// Stats returns cache statistics
+func (mc *MemoryCache) Stats() CacheStats {
+	mc.mu.RLock()
+	defer mc.mu.RUnlock()
+
+	total := mc.stats.Hits + mc.stats.Misses
+	hitRate := 0.0
+	if total > 0 {
+		hitRate = float64(mc.stats.Hits) / float64(total) * 100
+	}
+
+	return CacheStats{
+		Hits:       mc.stats.Hits,
+		Misses:     mc.stats.Misses,
+		HitRate:    hitRate,
+		Size:       len(mc.items),
+		Evictions:  mc.stats.Evictions,
+		TotalItems: mc.stats.TotalItems,
+	}
+}
+
+// Close stops the cache cleanup goroutine
+func (mc *MemoryCache) Close() {
+	mc.cleanupTick.Stop()
+	close(mc.stopCleanup)
+}
+
+// RedisCache is a Redis-based cache implementation (placeholder)
+type RedisCache struct {
+	// Redis client would be here
+}
+
+// NewRedisCache creates a new Redis cache
+func NewRedisCache(addr string, password string, db int) *RedisCache {
+	// Implementation would connect to Redis
+	return &RedisCache{}
+}
+
+// Get retrieves an item from Redis cache
+func (rc *RedisCache) Get(key string) (any, bool) {
+	// Redis GET implementation
+	return nil, false
+}
+
+// Set stores an item in Redis cache
+func (rc *RedisCache) Set(key string, value any, ttl time.Duration) {
+	// Redis SET implementation
+}
+
+// Delete removes an item from Redis cache
+func (rc *RedisCache) Delete(key string) {
+	// Redis DEL implementation
+}
+
+// Clear removes all items from Redis cache
+func (rc *RedisCache) Clear() {
+	// Redis FLUSH implementation
+}
+
+// Keys returns all keys in Redis cache
+func (rc *RedisCache) Keys() []string {
+	// Redis KEYS implementation
+	return nil
+}
+
+// Size returns the current cache size
+func (rc *RedisCache) Size() int {
+	// Redis DBSIZE implementation
+	return 0
+}
+
+// Stats returns cache statistics
+func (rc *RedisCache) Stats() CacheStats {
+	// Redis INFO implementation
+	return CacheStats{}
+}
+
+// CacheManager manages multiple cache instances
+type CacheManager struct {
+	caches map[string]Cache
+	mu     sync.RWMutex
+}
+
+// NewCacheManager creates a new cache manager
+func NewCacheManager() *CacheManager {
+	return &CacheManager{
+		caches: make(map[string]Cache),
+	}
+}
+
+// AddCache adds a cache instance
+func (cm *CacheManager) AddCache(name string, cache Cache) {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+	cm.caches[name] = cache
+}
+
+// GetCache retrieves a cache instance
+func (cm *CacheManager) GetCache(name string) (Cache, bool) {
+	cm.mu.RLock()
+	defer cm.mu.RUnlock()
+	cache, exists := cm.caches[name]
+	return cache, exists
+}
+
+// RemoveCache removes a cache instance
+func (cm *CacheManager) RemoveCache(name string) {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+	delete(cm.caches, name)
+}
+
+// GetAllStats returns statistics for all caches
+func (cm *CacheManager) GetAllStats() map[string]CacheStats {
+	cm.mu.RLock()
+	defer cm.mu.RUnlock()
+
+	stats := make(map[string]CacheStats)
+	for name, cache := range cm.caches {
+		stats[name] = cache.Stats()
+	}
+	return stats
+}
+
+// ClearAll clears all caches
+func (cm *CacheManager) ClearAll() {
+	cm.mu.RLock()
+	defer cm.mu.RUnlock()
+
+	for _, cache := range cm.caches {
+		cache.Clear()
+	}
+}
+
+// Global cache manager instance
+var globalCacheManager *CacheManager
+
+// InitializeCacheManager initializes the global cache manager
+func InitializeCacheManager() {
+	globalCacheManager = NewCacheManager()
+
+	// Add default memory cache
+	memoryCache := NewMemoryCache(1000, 5*time.Minute)
+	globalCacheManager.AddCache("default", memoryCache)
+
+	// Add specialized caches
+	userCache := NewMemoryCache(500, 10*time.Minute)
+	globalCacheManager.AddCache("users", userCache)
+
+	serviceCache := NewMemoryCache(200, 2*time.Minute)
+	globalCacheManager.AddCache("services", serviceCache)
+
+	metricsCache := NewMemoryCache(1000, 1*time.Minute)
+	globalCacheManager.AddCache("metrics", metricsCache)
+}
+
+// GetCacheManager returns the global cache manager
+func GetCacheManager() *CacheManager {
+	return globalCacheManager
+}
+
+// GetDefaultCache returns the default cache
+func GetDefaultCache() Cache {
+	if globalCacheManager == nil {
+		InitializeCacheManager()
+	}
+	cache, _ := globalCacheManager.GetCache("default")
+	return cache
+}
+
+// GetUserCache returns the user cache
+func GetUserCache() Cache {
+	if globalCacheManager == nil {
+		InitializeCacheManager()
+	}
+	cache, _ := globalCacheManager.GetCache("users")
+	return cache
+}
+
+// GetServiceCache returns the service cache
+func GetServiceCache() Cache {
+	if globalCacheManager == nil {
+		InitializeCacheManager()
+	}
+	cache, _ := globalCacheManager.GetCache("services")
+	return cache
+}
+
+// GetMetricsCache returns the metrics cache
+func GetMetricsCache() Cache {
+	if globalCacheManager == nil {
+		InitializeCacheManager()
+	}
+	cache, _ := globalCacheManager.GetCache("metrics")
+	return cache
+}
+
+// CacheKey generates a cache key with namespace
+func CacheKey(namespace, key string) string {
+	return fmt.Sprintf("%s:%s", namespace, key)
+}
+
+// SerializeValue serializes a value for caching
+func SerializeValue(value any) ([]byte, error) {
+	return json.Marshal(value)
+}
+
+// DeserializeValue deserializes a value from cache
+func DeserializeValue(data []byte, target any) error {
+	return json.Unmarshal(data, target)
+}