diff --git a/.cargo/config.toml b/.cargo/config.toml
index a7abadc..bff29e6 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,3 +1,2 @@
 [build]
 rustflags = ["--cfg", "tokio_unstable"]
-# "-C", "target-cpu=native"]
diff --git a/.gitignore b/.gitignore
index d80f0e4..5303732 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,8 @@ lcov.info
 *.profraw
 *_git2_*
 /.jj
+/.direnv
+# Symlink into Nix store after successful `nix build`:
+/result
+# For personal .envrc files
+.envrc
\ No newline at end of file
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..7126125
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "esbenp.prettier-vscode",
+    "jnoortheen.nix-ide",
+    "rust-lang.rust-analyzer",
+    "dnut.rewrap-revived"
+  ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 490fa22..93ea5ed 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,17 +1,20 @@
 {
-  "files.readonlyInclude": {
-    "googleapis/**": true,
-    "target/**": true
+  "[jsonc]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
   },
   "[typescript]": {
-    "editor.defaultFormatter": "esbenp.prettier-vscode",
-    "editor.formatOnSave": true,
     "editor.codeActionsOnSave": {
-      "source.organizeImports": "explicit",
-      "source.fixAll": "explicit"
-    }
+      "source.fixAll": "explicit",
+      "source.organizeImports": "explicit"
+    },
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "files.readonlyInclude": {
+    "googleapis/**": true,
+    "target/**": true
   },
-  "rust-analyzer.rustfmt.extraArgs": ["+nightly"],
+  "rewrap.wrappingColumn": 100,
   "rust-analyzer.cargo.buildScripts.enable": true,
-  "rewrap.wrappingColumn": 100
+  "rust-analyzer.rustfmt.extraArgs": ["+nightly"]
 }
diff --git a/crates/googleapis/include b/crates/googleapis/include
index 901fc8e..9bed6f0 160000
--- a/crates/googleapis/include
+++ b/crates/googleapis/include
@@ -1 +1 @@
-Subproject commit 901fc8ee4257d5d7b0d53ba3494fab53bf1a2a67
+Subproject commit 9bed6f077867e387960082891ec0e1b8bb254a47
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..e93369c
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,143 @@
+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "naersk",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1752475459,
+        "narHash": "sha256-z6QEu4ZFuHiqdOPbYss4/Q8B0BFhacR8ts6jO/F/aOU=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "bf0d6f70f4c9a9cf8845f992105652173f4b617f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "fenix": "fenix",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1752689277,
+        "narHash": "sha256-uldUBFkZe/E7qbvxa3mH1ItrWZyT6w1dBKJQF/3ZSsc=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "0e72363d0938b0208d6c646d10649164c43f4d64",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1758690382,
+        "narHash": "sha256-NY3kSorgqE5LMm1LqNwGne3ZLMF2/ILgLpFr1fS4X3o=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "e643668fd71b949c53f8626614b21ff71a07379d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1752428706,
+        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1758854041,
+        "narHash": "sha256-kZ+24pbf4FiHlYlcvts64BhpxpHkPKIQXBmx1OmBAIo=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "02227ca8c229c968dbb5de95584cfb12b4313104",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..0bfd7ce
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,90 @@
+{
+  description = "Google Cloud Firestore emulator with focus on stability";
+
+  inputs = {
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    naersk = {
+      url = "github:nix-community/naersk"; # For building rust crates as Nix derivations.
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    # `self` refers to the copy of this git repository in the Nix Store. By setting
+    # `self.submodules` to `true`, we ensure the `googleapis` git submodule gets copied into the Nix
+    # store at the expected path.
+    self.submodules = true;
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+      rust-overlay,
+      naersk,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+        rust-toolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        # Initialize the naersk builder to use our specific toolchain:
+        rust-builder = pkgs.callPackage naersk {
+          cargo = rust-toolchain;
+          rustc = rust-toolchain;
+        };
+        # Packages necessary for building the firestore-emulator crate.
+        buildInputs = with pkgs; [
+          openssl
+          pkg-config
+          protobuf
+        ];
+      in
+      {
+        # Define the development environment with the necessary dependencies and rust toolchain:
+        devShells.default = pkgs.mkShell {
+          # Made available in the shell's PATH.
+          inherit buildInputs;
+          name = "rust-shell";
+
+          # Other project dependencies to be made avaible in PATH:
+          packages = with pkgs; [
+            # Nix language server and formatter.
+            nixd
+            nixfmt-rfc-style
+            # Additional project dependencies.
+            just
+            cargo-tarpaulin
+            cargo-nextest
+            rustup
+            # Misc.
+            git
+          ];
+        };
+
+        # Nix derivation for building the firestore-emulator using Naersk.
+        #
+        # `nix build` produces a symlink `./result` that points to the Nix store directory
+        # containing the built firestore-emulator binary under `./result/bin/firestore-emulator`
+        #
+        # Locally, `nix run . -- ARGS` runs the firestore-emulator binary with the provided
+        # arguments. For example: `nix run . -- --host-port 127.0.0.1:8080` to start the emulator on
+        # localhost.
+        #
+        # You can even run the emulator without manually doing a local checkout of this repository
+        # with `nix run github:skunkteam/rust-firestore-emulator -- ARGS`.
+        defaultPackage = rust-builder.buildPackage {
+          src = self;
+          # Naersk can't deal with `version = { workspace = true }` for the root package, so extract
+          # it manually:
+          version = with builtins; (fromTOML (readFile ./Cargo.toml)).workspace.package.version;
+          nativeBuildInputs = buildInputs;
+        };
+      }
+    );
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..9ea740a
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "1.90.0"
+profile = "default" # Includes components: rustc, rust-std, cargo, rust-docs, rustfmt, and clippy.
+components = ["rust-src", "rust-analyzer"] # Additional components.