diff --git a/GoogleDataLogger/GoogleDataLogger/Classes/GDLUploader.h b/GoogleDataLogger/GoogleDataLogger/Classes/GDLUploader.h
new file mode 100644
index 00000000000..38d4c6a6237
--- /dev/null
+++ b/GoogleDataLogger/GoogleDataLogger/Classes/GDLUploader.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** This class connects log storage and the backend implementations, providing logs to the uploaders
+ * and informing the log storage what logs were successfully uploaded or not.
+ */
+@interface GDLUploader : NSObject
+
+/** Creates and/or returrns the singleton.
+ *
+ * @return The singleton instance of this class.
+ */
++ (instancetype)sharedInstance;
+
+/** Forces the backend specified by the target to upload the provided set of logs. This should only
+ * ever happen when the QoS tier of a log requires it.
+ */
+- (void)forceUploadLogs:(NSSet<NSURL *> *)logFiles target:(NSInteger)logTarget;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/GoogleDataLogger/GoogleDataLogger/Classes/GDLUploader.m b/GoogleDataLogger/GoogleDataLogger/Classes/GDLUploader.m
new file mode 100644
index 00000000000..5cc07847db0
--- /dev/null
+++ b/GoogleDataLogger/GoogleDataLogger/Classes/GDLUploader.m
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "GDLUploader.h"
+
+@implementation GDLUploader
+
++ (instancetype)sharedInstance {
+  static GDLUploader *sharedUploader;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    sharedUploader = [[GDLUploader alloc] init];
+  });
+  return sharedUploader;
+}
+
+- (void)forceUploadLogs:(NSSet<NSURL *> *)logFiles target:(NSInteger)logTarget {
+  // TODO
+}
+
+@end
diff --git a/GoogleDataLogger/Tests/GDLLogUploaderTest.m b/GoogleDataLogger/Tests/GDLLogUploaderTest.m
new file mode 100644
index 00000000000..f57c142cd11
--- /dev/null
+++ b/GoogleDataLogger/Tests/GDLLogUploaderTest.m
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <XCTest/XCTest.h>
+
+#import "GDLUploader.h"
+
+@interface GDLUploaderTest : XCTestCase
+
+@end
+
+@implementation GDLUploaderTest
+
+/** Tests the default initializer. */
+- (void)testSharedInstance {
+  XCTAssertEqual([GDLUploader sharedInstance], [GDLUploader sharedInstance]);
+}
+
+@end
diff --git a/GoogleDataLogger/Tests/Helpers/GDLTestBackend.h b/GoogleDataLogger/Tests/Helpers/GDLTestBackend.h
new file mode 100644
index 00000000000..aeccf4f34d4
--- /dev/null
+++ b/GoogleDataLogger/Tests/Helpers/GDLTestBackend.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "GDLLogBackend.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** This class implements the log backend protocol for testing purposes, providing APIs to allow
+ * tests to alter the uploader behavior without creating a bunch of specialized classes.
+ */
+@interface GDLTestBackend : NSObject <GDLLogBackend>
+
+/** A block that can be ran in -uploadLogs:onComplete:. */
+@property(nullable, nonatomic) void (^uploadLogsBlock)
+    (NSSet<NSURL *> *logFiles, GDLBackendCompletionBlock completionBlock);
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/GoogleDataLogger/Tests/Helpers/GDLTestBackend.m b/GoogleDataLogger/Tests/Helpers/GDLTestBackend.m
new file mode 100644
index 00000000000..477ca753ca8
--- /dev/null
+++ b/GoogleDataLogger/Tests/Helpers/GDLTestBackend.m
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "GDLTestBackend.h"
+
+@implementation GDLTestBackend
+
+- (void)uploadLogs:(NSSet<NSURL *> *)logFiles onComplete:(GDLBackendCompletionBlock)onComplete {
+  if (_uploadLogsBlock) {
+    _uploadLogsBlock(logFiles, onComplete);
+  } else if (onComplete) {
+    onComplete(nil, nil);
+  }
+}
+
+@end
diff --git a/GoogleDataLogger/Tests/Helpers/GDLTestPrioritizer.h b/GoogleDataLogger/Tests/Helpers/GDLTestPrioritizer.h
new file mode 100644
index 00000000000..c5fd17dbf4c
--- /dev/null
+++ b/GoogleDataLogger/Tests/Helpers/GDLTestPrioritizer.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import <GoogleDataLogger/GDLLogPrioritizer.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** This class implements the log prioritizer protocol for testing purposes, providing APIs to allow
+ * tests to alter the prioritizer behavior without creating a bunch of specialized classes.
+ */
+@interface GDLTestPrioritizer : NSObject <GDLLogPrioritizer>
+
+/** The return value of -logsForNextUpload. */
+@property(nullable, nonatomic) NSSet<NSNumber *> *logsForNextUploadFake;
+
+/** Allows the running of a block of code during -prioritizeLog. */
+@property(nullable, nonatomic) void (^prioritizeLogBlock)(GDLLogEvent *logEvent);
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/GoogleDataLogger/Tests/Helpers/GDLTestPrioritizer.m b/GoogleDataLogger/Tests/Helpers/GDLTestPrioritizer.m
new file mode 100644
index 00000000000..8db2f3a418f
--- /dev/null
+++ b/GoogleDataLogger/Tests/Helpers/GDLTestPrioritizer.m
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "GDLTestPrioritizer.h"
+
+@implementation GDLTestPrioritizer
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _logsForNextUploadFake = [[NSSet alloc] init];
+  }
+  return self;
+}
+
+- (NSSet<NSNumber *> *)logsForNextUpload {
+  return _logsForNextUploadFake;
+}
+
+- (void)prioritizeLog:(GDLLogEvent *)logEvent {
+  if (_prioritizeLogBlock) {
+    _prioritizeLogBlock(logEvent);
+  }
+}
+
+@end