diff --git a/packages/signer/signer-btc/src/api/SignerBtcBuiilder.test.ts b/packages/signer/signer-btc/src/api/SignerBtcBuiilder.test.ts
new file mode 100644
index 000000000..03940be3a
--- /dev/null
+++ b/packages/signer/signer-btc/src/api/SignerBtcBuiilder.test.ts
@@ -0,0 +1,18 @@
+import { type DeviceManagementKit } from "@ledgerhq/device-management-kit";
+
+import { SignerBtcBuilder } from "@api/SignerBtcBuilder";
+
+describe("SignerBtcBuilder", () => {
+  const dmk: DeviceManagementKit = {} as DeviceManagementKit;
+
+  test("should be an instance of SignerBtc", () => {
+    // GIVEN
+    const builder = new SignerBtcBuilder({ dmk, sessionId: "" });
+
+    // WHEN
+    builder.build();
+
+    // THEN
+    expect(builder).toBeInstanceOf(SignerBtcBuilder);
+  });
+});
diff --git a/packages/signer/signer-btc/src/api/SignerBtcBuilder.ts b/packages/signer/signer-btc/src/api/SignerBtcBuilder.ts
index 53d9ff5e8..cd67b790b 100644
--- a/packages/signer/signer-btc/src/api/SignerBtcBuilder.ts
+++ b/packages/signer/signer-btc/src/api/SignerBtcBuilder.ts
@@ -20,8 +20,8 @@ type SignerBtcBuilderConstructorArgs = {
  * ```
  */
 export class SignerBtcBuilder {
-  private _dmk: DeviceManagementKit;
-  private _sessionId: DeviceSessionId;
+  private readonly _dmk: DeviceManagementKit;
+  private readonly _sessionId: DeviceSessionId;
 
   constructor({ dmk, sessionId }: SignerBtcBuilderConstructorArgs) {
     this._dmk = dmk;
diff --git a/packages/signer/signer-btc/src/api/index.ts b/packages/signer/signer-btc/src/api/index.ts
index 36e101c10..1122cc65e 100644
--- a/packages/signer/signer-btc/src/api/index.ts
+++ b/packages/signer/signer-btc/src/api/index.ts
@@ -1,4 +1,5 @@
 export { type SignerBtc } from "./SignerBtc";
+export { SignerBtcBuilder } from "./SignerBtcBuilder";
 export * from "@api/app-binder/GetExtendedPublicKeyDeviceActionTypes";
 export type {
   SignMessageDAError,