diff --git a/src/dotnet/APIView/APIViewWeb/APIViewWeb.csproj b/src/dotnet/APIView/APIViewWeb/APIViewWeb.csproj
index a17d5f2e4d0..9f8e4072bcc 100644
--- a/src/dotnet/APIView/APIViewWeb/APIViewWeb.csproj
+++ b/src/dotnet/APIView/APIViewWeb/APIViewWeb.csproj
@@ -23,8 +23,10 @@
 
   <ItemGroup>
     <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="11.0.0" />
+    <PackageReference Include="Azure.AI.OpenAI" Version="1.0.0-beta.6" />
     <PackageReference Include="Azure.Data.AppConfiguration" Version="1.2.0" />
     <PackageReference Include="Azure.Identity" Version="1.8.0" />
+    <PackageReference Include="Azure.Search.Documents" Version="11.4.0" />
     <PackageReference Include="Azure.Storage.Blobs" Version="12.13.0" />
     <PackageReference Include="CsvHelper" Version="27.2.1" />
     <!-- Adding NU1701 suppression as these three libraries have not updated to more modern versions of .net, although in testing they work as required. -->
@@ -49,6 +51,7 @@
     <PackageReference Include="Microsoft.VisualStudio.Services.Client" Version="16.170.0" />
     <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.9" PrivateAssets="All" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19367-01" PrivateAssets="All" />
+    <PackageReference Include="MongoDB.Driver" Version="2.20.0" />
     <PackageReference Include="Octokit" Version="3.0.0" />
   </ItemGroup>
 
diff --git a/src/dotnet/APIView/APIViewWeb/Controllers/CopilotCommentsController.cs b/src/dotnet/APIView/APIViewWeb/Controllers/CopilotCommentsController.cs
new file mode 100644
index 00000000000..dca7029115c
--- /dev/null
+++ b/src/dotnet/APIView/APIViewWeb/Controllers/CopilotCommentsController.cs
@@ -0,0 +1,91 @@
+using System.Text.Json;
+using System.Threading.Tasks;
+using APIViewWeb.Managers;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+
+namespace APIViewWeb.Controllers
+{
+    public class CopilotCommentsController : Controller
+    {
+        private readonly ICopilotCommentsManager _copilotManager;
+        private readonly ILogger _logger;
+
+        public CopilotCommentsController(ICopilotCommentsManager copilotManager, ILogger<CopilotCommentsController> logger)
+        {
+            _copilotManager = copilotManager;
+            _logger = logger;
+        }
+
+        [HttpPost]
+        public async Task<ActionResult> CreateDocument(string badCode, string language, string goodCode = null, string comment = null, string[] guidelineIds = null)
+        {
+            if (badCode == null)
+            {
+                _logger.LogInformation("Request does not have the required badCode field for CREATE.");
+                return StatusCode(statusCode: StatusCodes.Status500InternalServerError);
+            }
+
+            var id = await _copilotManager.CreateDocumentAsync(User.GetGitHubLogin(), badCode, goodCode, language, comment, guidelineIds);
+            _logger.LogInformation("Added a new document to database.");
+            return StatusCode(statusCode: StatusCodes.Status201Created, id);
+
+        }
+
+        [HttpPut]
+        public async Task<ActionResult> UpdateDocument(string id, string badCode = null, string language = null, string goodCode = null, string comment = null, string[] guidelineIds = null)
+        {
+            if (id == null)
+            {
+                _logger.LogInformation("Request does not have the required ID field for UPDATE.");
+                return StatusCode(statusCode: StatusCodes.Status500InternalServerError);
+            }
+
+            var result = await _copilotManager.UpdateDocumentAsync(User.GetGitHubLogin(), id, badCode, goodCode, language, comment, guidelineIds);
+            if (result.ModifiedCount > 0)
+            {
+                _logger.LogInformation("Found existing document with ID. Updating document.");
+                var document = await _copilotManager.GetDocumentAsync(id);
+                return Ok(document);
+            } else
+            {
+                _logger.LogInformation("Could not find a match for the given ID.");
+                return StatusCode(statusCode: StatusCodes.Status404NotFound);
+            }
+        }
+
+        [HttpGet]
+        public async Task<ActionResult> GetDocument(string id)
+        {
+            if (id == null)
+            {
+                _logger.LogInformation("Request does not have the required ID field for GET.");
+                return StatusCode(statusCode: StatusCodes.Status400BadRequest);
+            }
+
+            var document = await _copilotManager.GetDocumentAsync(id);
+            if (document != null)
+            {
+                return Ok(document);
+            } else
+            {
+                _logger.LogInformation("No document with this id exists in the database.");
+                return StatusCode(statusCode: StatusCodes.Status404NotFound);
+            }
+        }
+
+        [HttpDelete]
+        public async Task<ActionResult> DeleteDocument(string id)
+        {
+            if (id == null)
+            {
+                _logger.LogInformation("Request does not have the required ID field for DELETE.");
+                return StatusCode(statusCode: StatusCodes.Status400BadRequest);
+            }
+
+            await _copilotManager.DeleteDocumentAsync(User.GetGitHubLogin(), id);
+            return StatusCode(statusCode: StatusCodes.Status204NoContent);
+        }
+    }
+}
diff --git a/src/dotnet/APIView/APIViewWeb/Managers/CopilotCommentsManager.cs b/src/dotnet/APIView/APIViewWeb/Managers/CopilotCommentsManager.cs
new file mode 100644
index 00000000000..1758d748737
--- /dev/null
+++ b/src/dotnet/APIView/APIViewWeb/Managers/CopilotCommentsManager.cs
@@ -0,0 +1,193 @@
+using System;
+using System.Threading.Tasks;
+using APIViewWeb.Models;
+using APIViewWeb.Repositories;
+using Microsoft.Extensions.Configuration;
+using Azure;
+using Azure.AI.OpenAI;
+using MongoDB.Driver;
+using MongoDB.Bson;
+using System.Linq;
+using Newtonsoft.Json;
+
+namespace APIViewWeb.Managers
+{
+    public class CopilotCommentsManager : ICopilotCommentsManager
+    {
+        private readonly ICopilotCommentsRepository _copilotCommentsRepository;
+        private readonly IConfiguration _configuration;
+        private readonly OpenAIClient _openAIClient;
+
+        public CopilotCommentsManager(
+            ICopilotCommentsRepository copilotCommentsRepository,
+            IConfiguration configuration
+            )
+        {
+            _copilotCommentsRepository = copilotCommentsRepository;
+            _configuration = configuration;
+
+            _openAIClient = new OpenAIClient(
+                new Uri(_configuration["OpenAI:Endpoint"]),
+                new AzureKeyCredential(_configuration["OpenAI:Key"]));
+        }
+
+        public async Task<string> CreateDocumentAsync(string user, string badCode, string goodCode, string language, string comment, string[] guidelineIds)
+        {
+            var embedding = await GetEmbeddingsAsync(badCode);
+
+            var document = new CopilotCommentModel()
+            {
+                BadCode = badCode,
+                GoodCode = goodCode,
+                Embedding = embedding,
+                Language = language,
+                Comment = comment,
+                GuidelineIds = guidelineIds,
+                ModifiedOn = DateTime.UtcNow,
+                ModifiedBy = user
+            };
+
+            return await _copilotCommentsRepository.InsertDocumentAsync(document);
+        }
+
+        public async Task<UpdateResult> UpdateDocumentAsync(string user, string id, string badCode, string goodCode, string language, string comment, string[] guidelineIds)
+        {
+            var filter = GetIdFilter(id);
+
+            var updateBuilder = Builders<CopilotCommentModel>.Update;
+            var update = updateBuilder
+                .Set("ModifiedOn", DateTime.UtcNow)
+                .Set("ModifiedBy", user);
+
+            if (goodCode != null)
+            {
+                update = update.Set("GoodCode", goodCode);
+            }
+
+            if (language != null)
+            {
+                update = update.Set("Language", language);
+            }
+
+            if (comment != null)
+            {
+                update = update.Set("Comment", comment);
+            }
+
+            if (guidelineIds != null)
+            {
+                update = update.Set("GuidelineIds", guidelineIds);
+            }
+
+            if (badCode != null)
+            {
+                var embedding = await GetEmbeddingsAsync(badCode);
+                update = update
+                    .Set("BadCode", badCode)
+                    .Set("Embedding", embedding);
+            }
+
+            return await _copilotCommentsRepository.UpdateDocumentAsync(filter, update);
+        }
+
+        public Task DeleteDocumentAsync(string user, string id)
+        {
+            var filter = GetIdFilter(id);
+
+            var updateBuilder = Builders<CopilotCommentModel>.Update;
+            var update = updateBuilder
+                .Set("IsDeleted", true)
+                .Set("ModifiedOn", DateTime.UtcNow)
+                .Set("ModifiedBy", user);
+
+            return _copilotCommentsRepository.DeleteDocumentAsync(filter, update); 
+        }
+
+        public async Task<string> GetDocumentAsync(string id)
+        {
+            var filter = GetIdFilter(id);
+            var document = await _copilotCommentsRepository.GetDocumentAsync(filter);
+
+            var documentJson = JsonConvert.SerializeObject(document);
+
+            return documentJson;
+        }
+
+        private FilterDefinition<CopilotCommentModel> GetIdFilter(string id)
+        {
+            return Builders<CopilotCommentModel>.Filter
+                .Where(f => f.Id.ToString() == id && f.IsDeleted == false);
+        }
+
+        private async Task<float[]> GetEmbeddingsAsync(string badCode)
+        {
+        /*
+         * Structure of Embeddings object
+         *  {
+         *      {
+         *          "Data", 
+         *          [
+         *              {
+         *                  "EmbeddingsItem", 
+         *                  {
+         *                      { "Embedding", [ "float1", "float2" ]},
+         *                      { "Index", "1"}
+         *                  }
+         *              }
+         *          ]
+         *      },
+         *      {
+         *          "Usage", 
+         *          {
+         *              { "PromptTokens", "1"},
+         *              { "TotalTokens", "2"}
+         *          }
+         *      }
+         *  }
+         */
+
+            var options = new EmbeddingsOptions(badCode);
+            var response = await _openAIClient.GetEmbeddingsAsync(_configuration["OpenAI:Model"], options);
+            var embeddings = response.Value;
+
+            var embedding = embeddings.Data[0].Embedding.ToArray();
+
+            return embedding;
+        }
+
+        public BsonDocument EmbeddingToBson(Embeddings embedding)
+        {
+            var data = embedding.Data;
+
+            var embeddingUsageBson = new BsonDocument
+            {
+                { "promptTokens", embedding.Usage.PromptTokens },
+                { "TotalTokens", embedding.Usage.TotalTokens }
+            };
+
+            var embeddingData = new BsonArray();
+
+            var embeddingBson = new BsonDocument
+            {
+                { "Data", embeddingData },
+                { "Usage", embeddingUsageBson }
+            };
+
+            foreach (var embeddingItem in data)
+            {
+                var vectors = embeddingItem.Embedding;
+                var vectorsBson = BsonArray.Create(vectors);
+
+                var embeddingItemBson = new BsonDocument
+                {
+                    { "Embedding", vectorsBson },
+                    { "Index", embeddingItem.Index }
+                };
+
+                embeddingData.Add(embeddingItemBson);
+            }
+
+            return embeddingBson;
+        }
+    }
+}
diff --git a/src/dotnet/APIView/APIViewWeb/Managers/ICopilotCommentsManager.cs b/src/dotnet/APIView/APIViewWeb/Managers/ICopilotCommentsManager.cs
new file mode 100644
index 00000000000..d6129455528
--- /dev/null
+++ b/src/dotnet/APIView/APIViewWeb/Managers/ICopilotCommentsManager.cs
@@ -0,0 +1,13 @@
+using System.Threading.Tasks;
+using MongoDB.Driver;
+
+namespace APIViewWeb.Managers
+{
+    public interface ICopilotCommentsManager
+    {
+        public Task<string> CreateDocumentAsync(string user, string badCode, string goodCode, string language, string comment, string[] guidelineIds);
+        public Task<UpdateResult> UpdateDocumentAsync(string user, string id, string badCode, string goodCode, string language, string comment, string[] guidelineIds);
+        public Task<string> GetDocumentAsync(string id);
+        public Task DeleteDocumentAsync(string user, string id);
+    }
+}
diff --git a/src/dotnet/APIView/APIViewWeb/Models/CopilotCommentModel.cs b/src/dotnet/APIView/APIViewWeb/Models/CopilotCommentModel.cs
new file mode 100644
index 00000000000..59c9c39f561
--- /dev/null
+++ b/src/dotnet/APIView/APIViewWeb/Models/CopilotCommentModel.cs
@@ -0,0 +1,21 @@
+using System;
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace APIViewWeb.Models
+{
+    public class CopilotCommentModel
+    {
+        [BsonId]
+        public ObjectId Id { get; set; }
+        public string BadCode { get; set; }
+        public string GoodCode { get; set; } = null;
+        public float[] Embedding { get; set; }
+        public string Language { get; set; }
+        public string Comment { get; set; } = null;
+        public string[] GuidelineIds { get; set; } = null;
+        public DateTime ModifiedOn { get; set; }
+        public string ModifiedBy { get; set; }
+        public bool IsDeleted { get; set; } = false;
+    }
+}
diff --git a/src/dotnet/APIView/APIViewWeb/Repositories/CopilotCommentsRepository.cs b/src/dotnet/APIView/APIViewWeb/Repositories/CopilotCommentsRepository.cs
new file mode 100644
index 00000000000..415f33e222b
--- /dev/null
+++ b/src/dotnet/APIView/APIViewWeb/Repositories/CopilotCommentsRepository.cs
@@ -0,0 +1,48 @@
+using System.Threading.Tasks;
+using APIViewWeb.Models;
+using Microsoft.Azure.Cosmos.Serialization.HybridRow;
+using Microsoft.Extensions.Configuration;
+using MongoDB.Driver;
+using MongoDB.Driver.Linq;
+
+namespace APIViewWeb.Repositories
+{
+    public class CopilotCommentsRepository : ICopilotCommentsRepository
+    {
+        private readonly MongoClient _mongoClient;
+        private readonly IMongoDatabase _database;
+        private readonly IMongoCollection<CopilotCommentModel> _collection;
+
+        public CopilotCommentsRepository(IConfiguration configuration)
+        {
+            _mongoClient = new MongoClient(configuration["CosmosMongoDB:ConnectionString"]);
+            _database = _mongoClient.GetDatabase(configuration["CosmosMongoDB:DatabaseName"]);
+            _collection = _database.GetCollection<CopilotCommentModel>(configuration["CosmosMongoDB:CollectionName"]);
+        }
+
+        public async Task<string> InsertDocumentAsync(CopilotCommentModel document)
+        {
+            await _collection.InsertOneAsync(document);
+            return document.Id.ToString();
+        }
+
+        public async Task<UpdateResult> UpdateDocumentAsync(
+            FilterDefinition<CopilotCommentModel> filter,
+            UpdateDefinition<CopilotCommentModel> update)
+        {
+            return await _collection.UpdateOneAsync(filter, update);
+        }
+
+        public Task DeleteDocumentAsync(
+            FilterDefinition<CopilotCommentModel> filter,
+            UpdateDefinition<CopilotCommentModel> update)
+        {
+            return _collection.UpdateOneAsync(filter, update);
+        }
+
+        public Task<CopilotCommentModel> GetDocumentAsync(FilterDefinition<CopilotCommentModel> filter)
+        {
+            return _collection.Find(filter).FirstOrDefaultAsync();
+        }
+    }
+}
diff --git a/src/dotnet/APIView/APIViewWeb/Repositories/ICopilotCommentsRepository.cs b/src/dotnet/APIView/APIViewWeb/Repositories/ICopilotCommentsRepository.cs
new file mode 100644
index 00000000000..4db05c356e8
--- /dev/null
+++ b/src/dotnet/APIView/APIViewWeb/Repositories/ICopilotCommentsRepository.cs
@@ -0,0 +1,21 @@
+using System.Threading.Tasks;
+using APIViewWeb.Models;
+using MongoDB.Driver;
+
+namespace APIViewWeb.Repositories
+{
+    public interface ICopilotCommentsRepository
+    {
+        public Task<string> InsertDocumentAsync(CopilotCommentModel document);
+
+        public Task<UpdateResult> UpdateDocumentAsync(
+            FilterDefinition<CopilotCommentModel> filter,
+            UpdateDefinition<CopilotCommentModel> update);
+
+        public Task DeleteDocumentAsync(
+            FilterDefinition<CopilotCommentModel> filter,
+            UpdateDefinition<CopilotCommentModel> update);
+
+        public Task<CopilotCommentModel> GetDocumentAsync(FilterDefinition<CopilotCommentModel> filter);
+    }
+}
diff --git a/src/dotnet/APIView/APIViewWeb/Startup.cs b/src/dotnet/APIView/APIViewWeb/Startup.cs
index 4b7dc57184c..54e85ba7809 100644
--- a/src/dotnet/APIView/APIViewWeb/Startup.cs
+++ b/src/dotnet/APIView/APIViewWeb/Startup.cs
@@ -93,6 +93,7 @@ public void ConfigureServices(IServiceCollection services)
             services.AddSingleton<ICosmosUsageSampleRepository, CosmosUsageSampleRepository>();
             services.AddSingleton<ICosmosUserProfileRepository, CosmosUserProfileRepository>();
             services.AddSingleton<IDevopsArtifactRepository, DevopsArtifactRepository>();
+            services.AddSingleton<ICopilotCommentsRepository, CopilotCommentsRepository>();
 
             services.AddSingleton<IReviewManager, ReviewManager>();
             services.AddSingleton<ICommentsManager, CommentsManager>();
@@ -102,6 +103,7 @@ public void ConfigureServices(IServiceCollection services)
             services.AddSingleton<IUsageSampleManager, UsageSampleManager>();
             services.AddSingleton<IUserProfileManager, UserProfileManager>();
             services.AddSingleton<IOpenSourceRequestManager, OpenSourceRequestManager>();
+            services.AddSingleton<ICopilotCommentsManager, CopilotCommentsManager>();
             services.AddSingleton<UserPreferenceCache>();
 
             services.AddSingleton<LanguageService, JsonLanguageService>();