diff --git a/apps/web-app/src/features/exchanges/components/AddSourceDialog.tsx b/apps/web-app/src/features/exchanges/components/AddSourceDialog.tsx
index 4a5b0cd..bc44c1b 100644
--- a/apps/web-app/src/features/exchanges/components/AddSourceDialog.tsx
+++ b/apps/web-app/src/features/exchanges/components/AddSourceDialog.tsx
@@ -53,6 +53,8 @@ export function AddSourceDialog({
       setCode('');
       setAliases('');
     } catch (_error) {
+      // TODO: Implement proper error handling/toast notification
+      // eslint-disable-next-line no-console
       console.error('Error adding source:', _error);
     } finally {
       setLoading(false);
diff --git a/apps/web-app/src/main.tsx b/apps/web-app/src/main.tsx
index 26e5f1b..9e97c8d 100644
--- a/apps/web-app/src/main.tsx
+++ b/apps/web-app/src/main.tsx
@@ -3,7 +3,12 @@ import ReactDOM from 'react-dom/client';
 import { App } from './app';
 import './index.css';
 
-ReactDOM.createRoot(document.getElementById('root')!).render(
+const rootElement = document.getElementById('root');
+if (!rootElement) {
+  throw new Error('Root element not found');
+}
+
+ReactDOM.createRoot(rootElement).render(
   <React.StrictMode>
     <App />
   </React.StrictMode>
diff --git a/libs/cache/src/connection-manager.ts b/libs/cache/src/connection-manager.ts
index d70203b..d0d361e 100644
--- a/libs/cache/src/connection-manager.ts
+++ b/libs/cache/src/connection-manager.ts
@@ -42,7 +42,11 @@ export class RedisConnectionManager {
         RedisConnectionManager.sharedConnections.set(name, connection);
         this.logger.info(`Created shared Redis connection: ${name}`);
       }
-      return RedisConnectionManager.sharedConnections.get(name)!;
+      const connection = RedisConnectionManager.sharedConnections.get(name);
+      if (!connection) {
+        throw new Error(`Expected connection ${name} to exist in shared connections`);
+      }
+      return connection;
     } else {
       // Create unique connection per instance
       const uniqueName = `${name}-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
@@ -113,7 +117,7 @@ export class RedisConnectionManager {
     try {
       await connection.quit();
     } catch (error) {
-      this.logger.warn('Error closing Redis connection:', error);
+      this.logger.warn('Error closing Redis connection:', error as Error);
     }
   }
 
diff --git a/libs/cache/src/index.ts b/libs/cache/src/index.ts
index 88efd1e..d11247b 100644
--- a/libs/cache/src/index.ts
+++ b/libs/cache/src/index.ts
@@ -21,7 +21,11 @@ export function createCache(options: CacheOptions): CacheProvider {
     const cacheKey = `${defaultOptions.keyPrefix}-${defaultOptions.ttl}`;
 
     if (cacheInstances.has(cacheKey)) {
-      return cacheInstances.get(cacheKey)!;
+      const cachedInstance = cacheInstances.get(cacheKey);
+      if (!cachedInstance) {
+        throw new Error(`Expected cache instance ${cacheKey} to exist`);
+      }
+      return cachedInstance;
     }
 
     const cache = new RedisCache(defaultOptions);
diff --git a/libs/config/src/cli.ts b/libs/config/src/cli.ts
index 029f122..b0fe42b 100644
--- a/libs/config/src/cli.ts
+++ b/libs/config/src/cli.ts
@@ -1,4 +1,5 @@
 #!/usr/bin/env bun
+/* eslint-disable no-console */
 import { parseArgs } from 'util';
 import { join } from 'path';
 import { ConfigManager } from './config-manager';
diff --git a/libs/config/src/loaders/env.loader.ts b/libs/config/src/loaders/env.loader.ts
index 984ea7c..9a47343 100644
--- a/libs/config/src/loaders/env.loader.ts
+++ b/libs/config/src/loaders/env.loader.ts
@@ -84,7 +84,13 @@ export class EnvLoader implements ConfigLoader {
   }
 
   private setNestedValue(obj: Record<string, any>, path: string[], value: unknown): boolean {
-    const lastKey = path.pop()!;
+    if (path.length === 0) {
+      return false; // Cannot set value on empty path
+    }
+    const lastKey = path.pop();
+    if (!lastKey) {
+      return false; // This should never happen due to length check above
+    }
     
     try {
       const target = path.reduce((acc, key) => {
@@ -175,6 +181,7 @@ export class EnvLoader implements ConfigLoader {
     } catch (error: any) {
       // File not found is not an error (env files are optional)
       if (error.code !== 'ENOENT') {
+        // eslint-disable-next-line no-console
         console.warn(`Warning: Could not load env file ${filePath}:`, error.message);
       }
     }
diff --git a/libs/event-bus/src/types.ts b/libs/event-bus/src/types.ts
index c835a1d..d07d569 100644
--- a/libs/event-bus/src/types.ts
+++ b/libs/event-bus/src/types.ts
@@ -4,7 +4,7 @@ export interface EventBusMessage<T = any> {
   source: string;
   timestamp: number;
   data: T;
-  metadata?: Record<string, any>;
+  metadata?: Record<string, unknown>;
 }
 
 export interface EventHandler<T = any> {
diff --git a/libs/http/src/types.ts b/libs/http/src/types.ts
index 330e05d..30f2e09 100644
--- a/libs/http/src/types.ts
+++ b/libs/http/src/types.ts
@@ -30,7 +30,7 @@ export interface RequestConfig {
   method?: HttpMethod;
   url: string;
   headers?: Record<string, string>;
-  data?: any; // Changed from 'body' to 'data' for consistency
+  data?: unknown; // Changed from 'body' to 'data' for consistency
   timeout?: number;
   proxy?: ProxyInfo | string; // Proxy can be a ProxyInfo object or a URL string
 }
diff --git a/libs/logger/src/logger.ts b/libs/logger/src/logger.ts
index aabd973..e14c87f 100644
--- a/libs/logger/src/logger.ts
+++ b/libs/logger/src/logger.ts
@@ -31,6 +31,7 @@ export function setLoggerConfig(config: LoggerConfig): void {
   globalConfig = { ...globalConfig, ...config };
   // Clear cache to force recreation with new config
   loggerCache.clear();
+  // eslint-disable-next-line no-console
   console.log('Logger config updated:', globalConfig.logLevel);
 }
 /**
@@ -118,7 +119,11 @@ function getPinoLogger(serviceName: string, config: LoggerConfig = globalConfig)
     loggerCache.set(cacheKey, pino(loggerOptions));
   }
 
-  return loggerCache.get(cacheKey)!;
+  const logger = loggerCache.get(cacheKey);
+  if (!logger) {
+    throw new Error(`Expected logger ${cacheKey} to exist in cache`);
+  }
+  return logger;
 }
 
 /**
@@ -303,6 +308,7 @@ export async function shutdownLoggers(): Promise<void> {
       if (typeof logger.flush === 'function') {
         logger.flush(err => {
           if (err) {
+            // eslint-disable-next-line no-console
             console.error('Logger flush error:', err);
           }
           resolve();
@@ -315,8 +321,10 @@ export async function shutdownLoggers(): Promise<void> {
 
   try {
     await Promise.allSettled(flushPromises);
+    // eslint-disable-next-line no-console
     console.log('All loggers flushed successfully');
   } catch (error) {
+    // eslint-disable-next-line no-console
     console.error('Logger flush failed:', error);
   } finally {
     loggerCache.clear();
diff --git a/libs/mongodb-client/src/types.ts b/libs/mongodb-client/src/types.ts
index 4680f10..17dd445 100644
--- a/libs/mongodb-client/src/types.ts
+++ b/libs/mongodb-client/src/types.ts
@@ -76,7 +76,7 @@ export interface DocumentBase {
   created_at: Date;
   updated_at: Date;
   source: string;
-  metadata?: Record<string, any>;
+  metadata?: Record<string, unknown>;
 }
 
 /**
@@ -150,7 +150,7 @@ export interface SecFiling extends DocumentBase {
   period_end_date: Date;
   url: string;
   content: string;
-  extracted_data?: Record<string, any>;
+  extracted_data?: Record<string, unknown>;
   financial_statements?: Array<{
     statement_type: string;
     data: Record<string, number>;
diff --git a/libs/questdb-client/src/client.ts b/libs/questdb-client/src/client.ts
index aeac394..2049330 100644
--- a/libs/questdb-client/src/client.ts
+++ b/libs/questdb-client/src/client.ts
@@ -77,7 +77,7 @@ export class QuestDBClient {
         return;
       } catch (error) {
         lastError = error as Error;
-        this.logger.warn(`QuestDB connection attempt ${attempt} failed:`, error);
+        this.logger.warn(`QuestDB connection attempt ${attempt} failed:`, error as Error);
 
         if (this.pgPool) {
           await this.pgPool.end();