diff --git a/specs/phoenix/runner b/specs/phoenix/runner
new file mode 100755
index 0000000..9689d79
--- /dev/null
+++ b/specs/phoenix/runner
@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+
+# Exit immediately if the script encounters a non-zero status.
+set -e
+
+# If set, Bash includes filenames beginning with a `.` in the results of
+# filename expansion. The filenames `.` and `..` must always be matched
+# explicitly, even if dotglob is set.
+shopt -s dotglob
+
+# ============================================================
+# PROLOGUE
+# ============================================================
+
+# Create a new top-level directory as fallback in case $BUILD (defined below)
+# is ever empty.
+mkdir -p "/tmp/bs.phoenix"
+
+# Create an intermediate build directory. The final step of this script will
+# copy the content from this directory to $OUT.
+BUILD=$(mktemp -d -p "/tmp/bs.phoenix")
+
+if [ -z "$BUILD" ]; then
+  >&2 echo "Failed to create temp directory."
+  exit 1
+fi
+
+# Deletes the intermediate build directory on exit. We use a concatenation of
+# the intermediate directory with the basename of the generated temp directory
+# to ensure we never evaluate to root (i.e. `/`). That should never actually
+# happen but a good habit to establish nonetheless.
+function cleanup {
+  rm -r "/tmp/bs.phoenix/$(basename "$BUILD")"
+}
+
+trap cleanup EXIT
+
+# ============================================================
+# BUILD
+# ============================================================
+
+# Copy template contents over to the intermediate build directory.
+cp -r template/* "$BUILD"
+
+# Explicitly set permissions on all copied files.
+find "$BUILD" -type f -execdir chmod 644 {} +
+find "$BUILD" -type d -execdir chmod 755 {} +
+
+# Generate a new project with the specified name using `mix`. Generate in a
+# subdirectory to avoid interactive conflict resolution.
+nix develop "$BUILD" --command bash -c "mix phx.new $BUILD/project --app '$APP'"
+
+# Copy the generated files into the intermediate build directory.
+mv -f "$BUILD"/project/* "$BUILD"
+rmdir "$BUILD"/project
+
+# Overwrite the generated README in favor of that defined in our template.
+cp template/README.md "$BUILD"
+chmod 644 "$BUILD"/README.md
+
+# Replace the template name found in the flake.nix file. The mix generator would
+# fail if $APP did not consist of just lowercase ASCII letters, numbers, or
+# underscores. Thus $APP is safe to interpolate into the following command.
+sed -i "s/<APP_NAME>/$APP/g" "$BUILD/flake.nix"
+
+# By default Phoenix generates a postgres configuration with assumed username
+# `postgres`. This flake encourages a local postgres database with username
+# `$(whoami)`. Reflect this in the config.
+sed -i "s/username: \"postgres\"/username: \"$(whoami)\"/g" "$BUILD/config/dev.exs"
+
+# ============================================================
+# EPILOGUE
+# ============================================================
+
+# Success! Copy contents to target directory.
+cp -r "$BUILD"/* "$OUT"
diff --git a/specs/phoenix/spec.json b/specs/phoenix/spec.json
new file mode 100644
index 0000000..6c191de
--- /dev/null
+++ b/specs/phoenix/spec.json
@@ -0,0 +1,6 @@
+{
+  "app": {
+    "type": "line",
+    "prompt": "App Name> "
+  }
+}
diff --git a/specs/phoenix/template/.envrc b/specs/phoenix/template/.envrc
new file mode 100644
index 0000000..b9238c3
--- /dev/null
+++ b/specs/phoenix/template/.envrc
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+use flake
diff --git a/specs/phoenix/template/README.md b/specs/phoenix/template/README.md
new file mode 100644
index 0000000..6ed16bc
--- /dev/null
+++ b/specs/phoenix/template/README.md
@@ -0,0 +1,53 @@
+# Phoenix Flake Template
+
+This is a template for constructing a environment for Elixir development
+(version 1.15.7, Erlang/OTP 25) with the [Phoenix](https://www.phoenixframework.org/)
+(version 1.7.10) framework. [direnv](https://direnv.net/) can be used to launch
+a dev shell upon entering this directory (refer to `.envrc`). Otherwise run via:
+```bash
+$> nix develop
+```
+
+## Quickstart
+
+To begin, create a new database:
+```bash
+$> pg_ctl initdb
+```
+If the flake's default `devShell` is loaded, this will create a database cluster
+at `$PWD/data`. To start the database, run the following:
+```bash
+$> pg_ctl start -o --unix_socket_directories="$PGDATA"
+```
+To shut the database down, run:
+```bash
+$> pg_ctl stop
+```
+You can also specify a different location for the database cluster using the
+`-D` option in each of the above commands.
+
+Afterward, you can run the Phoenix setup commands:
+```bash
+$> mix ecto.setup
+$> mix assets.setup
+```
+and then start the local server:
+```bash
+$> mix phx.server
+```
+
+## Language Server
+
+The [elixir-ls](https://github.com/elixir-lsp/elixir-ls) LSP (version 0.17.10)
+is included in this flake.
+
+## Dependencies
+
+This project pins Mix dependencies using [mix2nix](https://github.com/ydlr/mix2nix).
+After updating your `mix.lock` file, make sure to re-run the following:
+```bash
+mix2nix > deps.nix
+```
+As of now, `mix2nix` cannot handle git dependencies found inside the `mix.lock`
+file. If you have git dependencies, add them manually or use
+[FODs](https://nixos.org/manual/nixpkgs/stable/#packaging-beam-applications).
diff --git a/specs/phoenix/template/default.nix b/specs/phoenix/template/default.nix
new file mode 100644
index 0000000..f620865
--- /dev/null
+++ b/specs/phoenix/template/default.nix
@@ -0,0 +1,10 @@
+(import
+  (
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
+    fetchTarball {
+      url = lock.nodes.flake-compat.locked.url or "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }
+).defaultNix
diff --git a/specs/phoenix/template/deps.nix b/specs/phoenix/template/deps.nix
new file mode 100644
index 0000000..3fde5b3
--- /dev/null
+++ b/specs/phoenix/template/deps.nix
@@ -0,0 +1,545 @@
+{ lib, beamPackages, overrides ? (x: y: {}) }:
+
+let
+  buildRebar3 = lib.makeOverridable beamPackages.buildRebar3;
+  buildMix = lib.makeOverridable beamPackages.buildMix;
+  buildErlangMk = lib.makeOverridable beamPackages.buildErlangMk;
+
+  self = packages // (overrides self packages);
+
+  packages = with beamPackages; with self; {
+    castore = buildMix rec {
+      name = "castore";
+      version = "1.0.4";
+
+      src = fetchHex {
+        pkg = "castore";
+        version = "${version}";
+        sha256 = "9418c1b8144e11656f0be99943db4caf04612e3eaecefb5dae9a2a87565584f8";
+      };
+
+      beamDeps = [];
+    };
+
+    cowboy = buildErlangMk rec {
+      name = "cowboy";
+      version = "2.10.0";
+
+      src = fetchHex {
+        pkg = "cowboy";
+        version = "${version}";
+        sha256 = "3afdccb7183cc6f143cb14d3cf51fa00e53db9ec80cdcd525482f5e99bc41d6b";
+      };
+
+      beamDeps = [ cowlib ranch ];
+    };
+
+    cowboy_telemetry = buildRebar3 rec {
+      name = "cowboy_telemetry";
+      version = "0.4.0";
+
+      src = fetchHex {
+        pkg = "cowboy_telemetry";
+        version = "${version}";
+        sha256 = "7d98bac1ee4565d31b62d59f8823dfd8356a169e7fcbb83831b8a5397404c9de";
+      };
+
+      beamDeps = [ cowboy telemetry ];
+    };
+
+    cowlib = buildRebar3 rec {
+      name = "cowlib";
+      version = "2.12.1";
+
+      src = fetchHex {
+        pkg = "cowlib";
+        version = "${version}";
+        sha256 = "163b73f6367a7341b33c794c4e88e7dbfe6498ac42dcd69ef44c5bc5507c8db0";
+      };
+
+      beamDeps = [];
+    };
+
+    db_connection = buildMix rec {
+      name = "db_connection";
+      version = "2.6.0";
+
+      src = fetchHex {
+        pkg = "db_connection";
+        version = "${version}";
+        sha256 = "c2f992d15725e721ec7fbc1189d4ecdb8afef76648c746a8e1cad35e3b8a35f3";
+      };
+
+      beamDeps = [ telemetry ];
+    };
+
+    decimal = buildMix rec {
+      name = "decimal";
+      version = "2.1.1";
+
+      src = fetchHex {
+        pkg = "decimal";
+        version = "${version}";
+        sha256 = "53cfe5f497ed0e7771ae1a475575603d77425099ba5faef9394932b35020ffcc";
+      };
+
+      beamDeps = [];
+    };
+
+    dns_cluster = buildMix rec {
+      name = "dns_cluster";
+      version = "0.1.1";
+
+      src = fetchHex {
+        pkg = "dns_cluster";
+        version = "${version}";
+        sha256 = "03a3f6ff16dcbb53e219b99c7af6aab29eb6b88acf80164b4bd76ac18dc890b3";
+      };
+
+      beamDeps = [];
+    };
+
+    ecto = buildMix rec {
+      name = "ecto";
+      version = "3.11.0";
+
+      src = fetchHex {
+        pkg = "ecto";
+        version = "${version}";
+        sha256 = "7769dad267ef967310d6e988e92d772659b11b09a0c015f101ce0fff81ce1f81";
+      };
+
+      beamDeps = [ decimal jason telemetry ];
+    };
+
+    ecto_sql = buildMix rec {
+      name = "ecto_sql";
+      version = "3.11.0";
+
+      src = fetchHex {
+        pkg = "ecto_sql";
+        version = "${version}";
+        sha256 = "77aa3677169f55c2714dda7352d563002d180eb33c0dc29cd36d39c0a1a971f5";
+      };
+
+      beamDeps = [ db_connection ecto postgrex telemetry ];
+    };
+
+    esbuild = buildMix rec {
+      name = "esbuild";
+      version = "0.8.1";
+
+      src = fetchHex {
+        pkg = "esbuild";
+        version = "${version}";
+        sha256 = "25fc876a67c13cb0a776e7b5d7974851556baeda2085296c14ab48555ea7560f";
+      };
+
+      beamDeps = [ castore jason ];
+    };
+
+    expo = buildMix rec {
+      name = "expo";
+      version = "0.4.1";
+
+      src = fetchHex {
+        pkg = "expo";
+        version = "${version}";
+        sha256 = "2ff7ba7a798c8c543c12550fa0e2cbc81b95d4974c65855d8d15ba7b37a1ce47";
+      };
+
+      beamDeps = [];
+    };
+
+    file_system = buildMix rec {
+      name = "file_system";
+      version = "0.2.10";
+
+      src = fetchHex {
+        pkg = "file_system";
+        version = "${version}";
+        sha256 = "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc";
+      };
+
+      beamDeps = [];
+    };
+
+    finch = buildMix rec {
+      name = "finch";
+      version = "0.16.0";
+
+      src = fetchHex {
+        pkg = "finch";
+        version = "${version}";
+        sha256 = "f660174c4d519e5fec629016054d60edd822cdfe2b7270836739ac2f97735ec5";
+      };
+
+      beamDeps = [ castore mime mint nimble_options nimble_pool telemetry ];
+    };
+
+    floki = buildMix rec {
+      name = "floki";
+      version = "0.35.2";
+
+      src = fetchHex {
+        pkg = "floki";
+        version = "${version}";
+        sha256 = "6b05289a8e9eac475f644f09c2e4ba7e19201fd002b89c28c1293e7bd16773d9";
+      };
+
+      beamDeps = [];
+    };
+
+    gettext = buildMix rec {
+      name = "gettext";
+      version = "0.23.1";
+
+      src = fetchHex {
+        pkg = "gettext";
+        version = "${version}";
+        sha256 = "19d744a36b809d810d610b57c27b934425859d158ebd56561bc41f7eeb8795db";
+      };
+
+      beamDeps = [ expo ];
+    };
+
+    hpax = buildMix rec {
+      name = "hpax";
+      version = "0.1.2";
+
+      src = fetchHex {
+        pkg = "hpax";
+        version = "${version}";
+        sha256 = "2c87843d5a23f5f16748ebe77969880e29809580efdaccd615cd3bed628a8c13";
+      };
+
+      beamDeps = [];
+    };
+
+    jason = buildMix rec {
+      name = "jason";
+      version = "1.4.1";
+
+      src = fetchHex {
+        pkg = "jason";
+        version = "${version}";
+        sha256 = "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1";
+      };
+
+      beamDeps = [ decimal ];
+    };
+
+    mime = buildMix rec {
+      name = "mime";
+      version = "2.0.5";
+
+      src = fetchHex {
+        pkg = "mime";
+        version = "${version}";
+        sha256 = "da0d64a365c45bc9935cc5c8a7fc5e49a0e0f9932a761c55d6c52b142780a05c";
+      };
+
+      beamDeps = [];
+    };
+
+    mint = buildMix rec {
+      name = "mint";
+      version = "1.5.1";
+
+      src = fetchHex {
+        pkg = "mint";
+        version = "${version}";
+        sha256 = "4a63e1e76a7c3956abd2c72f370a0d0aecddc3976dea5c27eccbecfa5e7d5b1e";
+      };
+
+      beamDeps = [ castore hpax ];
+    };
+
+    nimble_options = buildMix rec {
+      name = "nimble_options";
+      version = "1.0.2";
+
+      src = fetchHex {
+        pkg = "nimble_options";
+        version = "${version}";
+        sha256 = "fd12a8db2021036ce12a309f26f564ec367373265b53e25403f0ee697380f1b8";
+      };
+
+      beamDeps = [];
+    };
+
+    nimble_pool = buildMix rec {
+      name = "nimble_pool";
+      version = "1.0.0";
+
+      src = fetchHex {
+        pkg = "nimble_pool";
+        version = "${version}";
+        sha256 = "80be3b882d2d351882256087078e1b1952a28bf98d0a287be87e4a24a710b67a";
+      };
+
+      beamDeps = [];
+    };
+
+    phoenix = buildMix rec {
+      name = "phoenix";
+      version = "1.7.10";
+
+      src = fetchHex {
+        pkg = "phoenix";
+        version = "${version}";
+        sha256 = "cf784932e010fd736d656d7fead6a584a4498efefe5b8227e9f383bf15bb79d0";
+      };
+
+      beamDeps = [ castore jason phoenix_pubsub phoenix_template plug plug_cowboy plug_crypto telemetry websock_adapter ];
+    };
+
+    phoenix_ecto = buildMix rec {
+      name = "phoenix_ecto";
+      version = "4.4.3";
+
+      src = fetchHex {
+        pkg = "phoenix_ecto";
+        version = "${version}";
+        sha256 = "d36c401206f3011fefd63d04e8ef626ec8791975d9d107f9a0817d426f61ac07";
+      };
+
+      beamDeps = [ ecto phoenix_html plug ];
+    };
+
+    phoenix_html = buildMix rec {
+      name = "phoenix_html";
+      version = "3.3.3";
+
+      src = fetchHex {
+        pkg = "phoenix_html";
+        version = "${version}";
+        sha256 = "923ebe6fec6e2e3b3e569dfbdc6560de932cd54b000ada0208b5f45024bdd76c";
+      };
+
+      beamDeps = [ plug ];
+    };
+
+    phoenix_live_dashboard = buildMix rec {
+      name = "phoenix_live_dashboard";
+      version = "0.8.3";
+
+      src = fetchHex {
+        pkg = "phoenix_live_dashboard";
+        version = "${version}";
+        sha256 = "f9470a0a8bae4f56430a23d42f977b5a6205fdba6559d76f932b876bfaec652d";
+      };
+
+      beamDeps = [ ecto mime phoenix_live_view telemetry_metrics ];
+    };
+
+    phoenix_live_reload = buildMix rec {
+      name = "phoenix_live_reload";
+      version = "1.4.1";
+
+      src = fetchHex {
+        pkg = "phoenix_live_reload";
+        version = "${version}";
+        sha256 = "9bffb834e7ddf08467fe54ae58b5785507aaba6255568ae22b4d46e2bb3615ab";
+      };
+
+      beamDeps = [ file_system phoenix ];
+    };
+
+    phoenix_live_view = buildMix rec {
+      name = "phoenix_live_view";
+      version = "0.20.1";
+
+      src = fetchHex {
+        pkg = "phoenix_live_view";
+        version = "${version}";
+        sha256 = "be494fd1215052729298b0e97d5c2ce8e719c00854b82cd8cf15c1cd7fcf6294";
+      };
+
+      beamDeps = [ jason phoenix phoenix_html phoenix_template plug telemetry ];
+    };
+
+    phoenix_pubsub = buildMix rec {
+      name = "phoenix_pubsub";
+      version = "2.1.3";
+
+      src = fetchHex {
+        pkg = "phoenix_pubsub";
+        version = "${version}";
+        sha256 = "bba06bc1dcfd8cb086759f0edc94a8ba2bc8896d5331a1e2c2902bf8e36ee502";
+      };
+
+      beamDeps = [];
+    };
+
+    phoenix_template = buildMix rec {
+      name = "phoenix_template";
+      version = "1.0.3";
+
+      src = fetchHex {
+        pkg = "phoenix_template";
+        version = "${version}";
+        sha256 = "16f4b6588a4152f3cc057b9d0c0ba7e82ee23afa65543da535313ad8d25d8e2c";
+      };
+
+      beamDeps = [ phoenix_html ];
+    };
+
+    plug = buildMix rec {
+      name = "plug";
+      version = "1.15.2";
+
+      src = fetchHex {
+        pkg = "plug";
+        version = "${version}";
+        sha256 = "02731fa0c2dcb03d8d21a1d941bdbbe99c2946c0db098eee31008e04c6283615";
+      };
+
+      beamDeps = [ mime plug_crypto telemetry ];
+    };
+
+    plug_cowboy = buildMix rec {
+      name = "plug_cowboy";
+      version = "2.6.1";
+
+      src = fetchHex {
+        pkg = "plug_cowboy";
+        version = "${version}";
+        sha256 = "de36e1a21f451a18b790f37765db198075c25875c64834bcc82d90b309eb6613";
+      };
+
+      beamDeps = [ cowboy cowboy_telemetry plug ];
+    };
+
+    plug_crypto = buildMix rec {
+      name = "plug_crypto";
+      version = "2.0.0";
+
+      src = fetchHex {
+        pkg = "plug_crypto";
+        version = "${version}";
+        sha256 = "53695bae57cc4e54566d993eb01074e4d894b65a3766f1c43e2c61a1b0f45ea9";
+      };
+
+      beamDeps = [];
+    };
+
+    postgrex = buildMix rec {
+      name = "postgrex";
+      version = "0.17.3";
+
+      src = fetchHex {
+        pkg = "postgrex";
+        version = "${version}";
+        sha256 = "946cf46935a4fdca7a81448be76ba3503cff082df42c6ec1ff16a4bdfbfb098d";
+      };
+
+      beamDeps = [ db_connection decimal jason ];
+    };
+
+    ranch = buildRebar3 rec {
+      name = "ranch";
+      version = "1.8.0";
+
+      src = fetchHex {
+        pkg = "ranch";
+        version = "${version}";
+        sha256 = "49fbcfd3682fab1f5d109351b61257676da1a2fdbe295904176d5e521a2ddfe5";
+      };
+
+      beamDeps = [];
+    };
+
+    swoosh = buildMix rec {
+      name = "swoosh";
+      version = "1.14.2";
+
+      src = fetchHex {
+        pkg = "swoosh";
+        version = "${version}";
+        sha256 = "01d8fae72930a0b5c1bb9725df0408602ed8c5c3d59dc6e7a39c57b723cd1065";
+      };
+
+      beamDeps = [ cowboy finch jason mime plug plug_cowboy telemetry ];
+    };
+
+    tailwind = buildMix rec {
+      name = "tailwind";
+      version = "0.2.2";
+
+      src = fetchHex {
+        pkg = "tailwind";
+        version = "${version}";
+        sha256 = "ccfb5025179ea307f7f899d1bb3905cd0ac9f687ed77feebc8f67bdca78565c4";
+      };
+
+      beamDeps = [ castore ];
+    };
+
+    telemetry = buildRebar3 rec {
+      name = "telemetry";
+      version = "1.2.1";
+
+      src = fetchHex {
+        pkg = "telemetry";
+        version = "${version}";
+        sha256 = "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5";
+      };
+
+      beamDeps = [];
+    };
+
+    telemetry_metrics = buildMix rec {
+      name = "telemetry_metrics";
+      version = "0.6.1";
+
+      src = fetchHex {
+        pkg = "telemetry_metrics";
+        version = "${version}";
+        sha256 = "7be9e0871c41732c233be71e4be11b96e56177bf15dde64a8ac9ce72ac9834c6";
+      };
+
+      beamDeps = [ telemetry ];
+    };
+
+    telemetry_poller = buildRebar3 rec {
+      name = "telemetry_poller";
+      version = "1.0.0";
+
+      src = fetchHex {
+        pkg = "telemetry_poller";
+        version = "${version}";
+        sha256 = "b3a24eafd66c3f42da30fc3ca7dda1e9d546c12250a2d60d7b81d264fbec4f6e";
+      };
+
+      beamDeps = [ telemetry ];
+    };
+
+    websock = buildMix rec {
+      name = "websock";
+      version = "0.5.3";
+
+      src = fetchHex {
+        pkg = "websock";
+        version = "${version}";
+        sha256 = "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453";
+      };
+
+      beamDeps = [];
+    };
+
+    websock_adapter = buildMix rec {
+      name = "websock_adapter";
+      version = "0.5.5";
+
+      src = fetchHex {
+        pkg = "websock_adapter";
+        version = "${version}";
+        sha256 = "4b977ba4a01918acbf77045ff88de7f6972c2a009213c515a445c48f224ffce9";
+      };
+
+      beamDeps = [ plug plug_cowboy websock ];
+    };
+  };
+in self
+
diff --git a/specs/phoenix/template/flake.lock b/specs/phoenix/template/flake.lock
new file mode 100644
index 0000000..035b7da
--- /dev/null
+++ b/specs/phoenix/template/flake.lock
@@ -0,0 +1,76 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "revCount": 57,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/edolstra/flake-compat/1.0.1/018afb31-abd1-7bff-a5e4-cff7e18efb7a/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1700794826,
+        "narHash": "sha256-RyJTnTNKhO0yqRpDISk03I/4A67/dp96YRxc86YOPgU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5a09cb4b393d58f9ed0d9ca1555016a8543c2ac8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "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/specs/phoenix/template/flake.nix b/specs/phoenix/template/flake.nix
new file mode 100644
index 0000000..6a610e3
--- /dev/null
+++ b/specs/phoenix/template/flake.nix
@@ -0,0 +1,63 @@
+{
+  description = ''
+    An opinionated pheonix flake.
+
+    To generate a copy of this template elsewhere, run:
+    $> bootstrap phoenix
+  '';
+
+  inputs = {
+    flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        inherit (pkgs.beam.packages.erlang_25)
+          beamPackages
+          elixir
+          elixir-ls
+          hex
+          mixRelease;
+
+        deps = import ./deps.nix {
+          lib = pkgs.lib;
+          inherit beamPackages;
+        };
+      in
+      {
+        packages = {
+          app = mixRelease {
+            pname = "<APP_NAME>";
+            src = ./.;
+            version = "0.1.0";
+            mixNixDeps = deps;
+          };
+
+          default = self.packages.${system}.app;
+        };
+
+        devShells.default = pkgs.mkShell {
+          packages = [
+            elixir
+            elixir-ls
+            hex
+          ] ++ (with pkgs; [
+            inotify-tools  # For file watching in development.
+            mix2nix
+            postgresql_15
+          ]);
+          shellHook = ''
+            # The server will try to use the data directory named by this
+            # environment variable whenever `-D` is not specified (for e.g.
+            # `postgres` and `pg_ctl`).
+            # https://www.postgresql.org/docs/15/server-start.html
+            export PGDATA="$PWD/data"
+          '';
+        };
+      });
+}