diff --git a/packages/common/package.json b/packages/common/package.json
index 5924ef6..08da5df 100644
--- a/packages/common/package.json
+++ b/packages/common/package.json
@@ -9,5 +9,12 @@
         "dev": "node -e \"console.log('dev not configured')\"",
         "lint": "node -e \"console.log('lint not configured')\"",
         "test": "node -e \"console.log('test not configured')\""
+    },
+    "dependencies": {
+        "@prisma/client": "^5.18.0",
+        "redis": "^4.7.0"
+    },
+    "devDependencies": {
+        "prisma": "^5.18.0"
     }
 }
diff --git a/packages/common/prisma/schema.prisma b/packages/common/prisma/schema.prisma
new file mode 100644
index 0000000..c3975a1
--- /dev/null
+++ b/packages/common/prisma/schema.prisma
@@ -0,0 +1,10 @@
+generator client {
+    provider = "prisma-client-js"
+}
+
+datasource db {
+    provider = "postgresql"
+    url      = env("DATABASE_URL")
+}
+
+// TODO: Translate docs/architecture/postgres-schema.md into Prisma models.
diff --git a/packages/common/src/index.ts b/packages/common/src/index.ts
index cb0ff5c..03ece44 100644
--- a/packages/common/src/index.ts
+++ b/packages/common/src/index.ts
@@ -1 +1,2 @@
-export {};
+export * from './infra/postgres';
+export * from './infra/redis';
diff --git a/packages/common/src/infra/postgres.ts b/packages/common/src/infra/postgres.ts
new file mode 100644
index 0000000..461c325
--- /dev/null
+++ b/packages/common/src/infra/postgres.ts
@@ -0,0 +1,42 @@
+import { PrismaClient, type PrismaClientOptions } from '@prisma/client';
+
+export interface PostgresConfig {
+    url: string;
+    log?: PrismaClientOptions['log'];
+}
+
+export interface PostgresConnector {
+    readonly prisma: PrismaClient;
+    connect(): Promise<void>;
+    disconnect(): Promise<void>;
+}
+
+export const resolvePostgresConfigFromEnv = (
+    env: NodeJS.ProcessEnv = process.env
+): PostgresConfig => {
+    const url = env.DATABASE_URL ?? '';
+    if (!url) {
+        throw new Error('DATABASE_URL is required to create a Postgres client.');
+    }
+
+    return { url };
+};
+
+export const createPostgresConnector = (
+    config: PostgresConfig
+): PostgresConnector => {
+    const prisma = new PrismaClient({
+        datasources: {
+            db: {
+                url: config.url,
+            },
+        },
+        log: config.log,
+    });
+
+    return {
+        prisma,
+        connect: () => prisma.$connect(),
+        disconnect: () => prisma.$disconnect(),
+    };
+};
diff --git a/packages/common/src/infra/redis.ts b/packages/common/src/infra/redis.ts
new file mode 100644
index 0000000..e5b6d6c
--- /dev/null
+++ b/packages/common/src/infra/redis.ts
@@ -0,0 +1,43 @@
+import { createClient, type RedisClientOptions, type RedisClientType } from 'redis';
+
+export interface RedisConfig {
+    url: string;
+    database?: number;
+    options?: Omit<RedisClientOptions, 'url' | 'database'>;
+}
+
+export interface RedisConnector {
+    readonly client: RedisClientType;
+    connect(): Promise<void>;
+    disconnect(): Promise<void>;
+}
+
+export const resolveRedisConfigFromEnv = (
+    env: NodeJS.ProcessEnv = process.env
+): RedisConfig => {
+    const url = env.REDIS_URL ?? '';
+    if (!url) {
+        throw new Error('REDIS_URL is required to create a Redis client.');
+    }
+
+    const database = env.REDIS_DB !== undefined ? Number(env.REDIS_DB) : undefined;
+    if (database !== undefined && Number.isNaN(database)) {
+        throw new Error('REDIS_DB must be a number when provided.');
+    }
+
+    return { url, database };
+};
+
+export const createRedisConnector = (config: RedisConfig): RedisConnector => {
+    const client = createClient({
+        url: config.url,
+        database: config.database,
+        ...config.options,
+    });
+
+    return {
+        client,
+        connect: () => client.connect(),
+        disconnect: () => client.quit(),
+    };
+};