diff --git a/.changes/2652a0e3-6588-4542-a35d-eafd5adf8c77.json b/.changes/2652a0e3-6588-4542-a35d-eafd5adf8c77.json
new file mode 100644
index 000000000..997f8f6f7
--- /dev/null
+++ b/.changes/2652a0e3-6588-4542-a35d-eafd5adf8c77.json
@@ -0,0 +1,5 @@
+{
+    "id": "2652a0e3-6588-4542-a35d-eafd5adf8c77",
+    "type": "misc",
+    "description": "Refactor codegen to place serialization and serialization into the `serde` package rather than the `transform` package. Relocate `TlsVersion` to the `net` package. Make `ByteArrayContent` and friends `internal` and force consumers to go through companion object convenience functions."
+}
\ No newline at end of file
diff --git a/.changes/bd8a575c-ecec-4744-bde6-44f8900d573d.json b/.changes/bd8a575c-ecec-4744-bde6-44f8900d573d.json
new file mode 100644
index 000000000..57d6df910
--- /dev/null
+++ b/.changes/bd8a575c-ecec-4744-bde6-44f8900d573d.json
@@ -0,0 +1,5 @@
+{
+    "id": "bd8a575c-ecec-4744-bde6-44f8900d573d",
+    "type": "misc",
+    "description": "Refactor codegen to place serialization and serialization into the `serde` package rather than the `transform` package. Relocate `TlsVersion` to the  package. Make `ByteArrayContent` and friends `internal` and force consumers to go through companion object convenience functions."
+}
\ No newline at end of file
diff --git a/runtime/protocol/http-client-engines/http-client-engine-crt/common/src/aws/smithy/kotlin/runtime/http/engine/crt/ConnectionManager.kt b/runtime/protocol/http-client-engines/http-client-engine-crt/common/src/aws/smithy/kotlin/runtime/http/engine/crt/ConnectionManager.kt
index e02d7a559..2da86f823 100644
--- a/runtime/protocol/http-client-engines/http-client-engine-crt/common/src/aws/smithy/kotlin/runtime/http/engine/crt/ConnectionManager.kt
+++ b/runtime/protocol/http-client-engines/http-client-engine-crt/common/src/aws/smithy/kotlin/runtime/http/engine/crt/ConnectionManager.kt
@@ -9,13 +9,13 @@ import aws.sdk.kotlin.crt.io.SocketOptions
 import aws.sdk.kotlin.crt.io.TlsContext
 import aws.sdk.kotlin.crt.io.TlsContextOptionsBuilder
 import aws.sdk.kotlin.crt.io.Uri
-import aws.smithy.kotlin.runtime.net.TlsVersion
 import aws.smithy.kotlin.runtime.crt.SdkDefaultIO
 import aws.smithy.kotlin.runtime.http.HttpErrorCode
 import aws.smithy.kotlin.runtime.http.HttpException
 import aws.smithy.kotlin.runtime.http.engine.ProxyConfig
 import aws.smithy.kotlin.runtime.http.request.HttpRequest
 import aws.smithy.kotlin.runtime.io.Closeable
+import aws.smithy.kotlin.runtime.net.TlsVersion
 import kotlinx.coroutines.TimeoutCancellationException
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.Semaphore
diff --git a/runtime/protocol/http-client-engines/http-client-engine-okhttp/jvm/src/aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngine.kt b/runtime/protocol/http-client-engines/http-client-engine-okhttp/jvm/src/aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngine.kt
index 39cce1fc8..ea8c8773d 100644
--- a/runtime/protocol/http-client-engines/http-client-engine-okhttp/jvm/src/aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngine.kt
+++ b/runtime/protocol/http-client-engines/http-client-engine-okhttp/jvm/src/aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngine.kt
@@ -5,12 +5,12 @@
 
 package aws.smithy.kotlin.runtime.http.engine.okhttp
 
-import aws.smithy.kotlin.runtime.net.TlsVersion
 import aws.smithy.kotlin.runtime.http.HttpCall
 import aws.smithy.kotlin.runtime.http.config.EngineFactory
 import aws.smithy.kotlin.runtime.http.engine.*
 import aws.smithy.kotlin.runtime.http.engine.internal.HttpClientMetrics
 import aws.smithy.kotlin.runtime.http.request.HttpRequest
+import aws.smithy.kotlin.runtime.net.TlsVersion
 import aws.smithy.kotlin.runtime.operation.ExecutionContext
 import aws.smithy.kotlin.runtime.time.Instant
 import aws.smithy.kotlin.runtime.time.fromEpochMilliseconds
diff --git a/runtime/protocol/http-client/common/src/aws/smithy/kotlin/runtime/http/engine/TlsContext.kt b/runtime/protocol/http-client/common/src/aws/smithy/kotlin/runtime/http/engine/TlsContext.kt
index e06592324..2bfcf864b 100644
--- a/runtime/protocol/http-client/common/src/aws/smithy/kotlin/runtime/http/engine/TlsContext.kt
+++ b/runtime/protocol/http-client/common/src/aws/smithy/kotlin/runtime/http/engine/TlsContext.kt
@@ -5,9 +5,9 @@
 package aws.smithy.kotlin.runtime.http.engine
 
 import aws.smithy.kotlin.runtime.client.config.ClientSettings
-import aws.smithy.kotlin.runtime.net.TlsVersion
 import aws.smithy.kotlin.runtime.config.resolve
 import aws.smithy.kotlin.runtime.http.config.HttpEngineConfigDsl
+import aws.smithy.kotlin.runtime.net.TlsVersion
 
 /**
  * Defines values related to TLS and secure connections.
diff --git a/runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/net/TlsVersion.kt b/runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/net/TlsVersion.kt
index 452c66347..ce7ed9540 100644
--- a/runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/net/TlsVersion.kt
+++ b/runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/net/TlsVersion.kt
@@ -1,3 +1,7 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
 package aws.smithy.kotlin.runtime.net
 
 /**
@@ -23,4 +27,4 @@ public enum class TlsVersion {
      * TLS version 1.3
      */
     TLS_1_3,
-}
\ No newline at end of file
+}
diff --git a/runtime/smithy-client/common/src/aws/smithy/kotlin/runtime/client/config/ClientSettings.kt b/runtime/smithy-client/common/src/aws/smithy/kotlin/runtime/client/config/ClientSettings.kt
index a1f5190d9..5b7e68606 100644
--- a/runtime/smithy-client/common/src/aws/smithy/kotlin/runtime/client/config/ClientSettings.kt
+++ b/runtime/smithy-client/common/src/aws/smithy/kotlin/runtime/client/config/ClientSettings.kt
@@ -7,9 +7,9 @@ package aws.smithy.kotlin.runtime.client.config
 import aws.smithy.kotlin.runtime.InternalApi
 import aws.smithy.kotlin.runtime.client.LogMode
 import aws.smithy.kotlin.runtime.config.EnvironmentSetting
-import aws.smithy.kotlin.runtime.net.TlsVersion
 import aws.smithy.kotlin.runtime.config.enumEnvSetting
 import aws.smithy.kotlin.runtime.config.intEnvSetting
+import aws.smithy.kotlin.runtime.net.TlsVersion
 
 @InternalApi
 public object ClientSettings {