diff --git a/apps/backend/src/app/files/files.service.ts b/apps/backend/src/app/files/files.service.ts
index 8075ec8..4bcc90f 100644
--- a/apps/backend/src/app/files/files.service.ts
+++ b/apps/backend/src/app/files/files.service.ts
@@ -1,4 +1,63 @@
-import { Injectable } from "@nestjs/common";
+import { Injectable, NotFoundException, StreamableFile } from "@nestjs/common";
+import { DbService } from "apps/backend/src/app/db/db.service";
+import { FilesTable } from "apps/backend/src/app/db/schema";
+import { StorageService } from "apps/backend/src/app/storage/storage.service";
+import { IFileWithInformation } from "apps/backend/src/app/storage/storage.types";
+import { eq } from "drizzle-orm";
 
 @Injectable()
-export class FilesService {}
+export class FilesService {
+	constructor(
+		private readonly storage: StorageService,
+		private readonly database: DbService,
+	) {}
+
+	/**
+   * Fetches a file and its information based on the provided checksum.
+   *
+   * @param {string} checksum - The unique identifier for the file.
+   * @return {Promise<IFileWithInformation<object>>} An object containing the stream of the file, its information, and additional data.
+   * @throws {NotFoundException} If the file with the given checksum is not found.
+   */
+  public async get(checksum: string): Promise<IFileWithInformation<object>> {
+		const foundFiles = await this.database
+			.use()
+			.select()
+			.from(FilesTable)
+			.where(eq(FilesTable.checksum, checksum))
+			.prepare("getFileFromChecksum")
+			.execute();
+
+		if (foundFiles.length === 0)
+			throw new NotFoundException("File with checksum not found", {
+        description: `checksum : ${checksum}`
+      });
+
+		if (foundFiles.length > 1)
+			console.log(
+				"Multiples entries found in the database.\nInformation from the first row will be used.",
+			);
+		const file = foundFiles[0];
+
+		const fileBuffer = await this.storage.read(
+			file.checksum,
+			file.extension,
+			file.isDocumentation,
+		);
+		const streamableFile = new StreamableFile(fileBuffer);
+		const fileInformation = await this.storage.generateInformation(
+			fileBuffer,
+			file.fileName,
+			file.isDocumentation,
+		);
+
+		return {
+			stream: streamableFile,
+			info: fileInformation,
+			additionalData: {
+				//Since we can have twice or more entry in the database for the same checksum of a file.
+				foundEntry: foundFiles.length,
+			},
+		};
+	}
+}