diff --git a/.github/workflows/compile-all.yaml b/.github/workflows/compile-all.yaml
new file mode 100644
index 0000000..e758519
--- /dev/null
+++ b/.github/workflows/compile-all.yaml
@@ -0,0 +1,25 @@
+name: Compile All
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  compile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Setup secrets
+        run: |
+          cp secrets.yaml.sample secrets.yaml
+          cp templates/secrets.yaml.sample templates/secrets.yaml
+
+      - name: Compile All
+        run: |
+          nix develop --command make compile-all
diff --git a/.gitignore b/.gitignore
index 3ec88f7..7b66287 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,13 @@ secrets.yaml
 
 # direnv cache
 /.direnv
+
+# Make dependencies
+.Makefile.deps
+
+# Nix build outputs
+result
+result-*
+
+# Pre-commit
+.pre-commit-config.yaml
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..59e8756
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,62 @@
+# Automatically find all YAML files and exclude special/secrets files
+ALL_YAML := $(wildcard *.yaml)
+EXCLUDE_YAML := secrets.yaml btproxy.yaml
+DEVICE_YAML := $(filter-out $(EXCLUDE_YAML), $(ALL_YAML))
+DEVICES := $(DEVICE_YAML:.yaml=)
+
+BTPROXY_REPLICAS := c25bac c2577c c25b74
+
+STAMP_DIR := .esphome/stamps
+MAKEFLAGS += --keep-going
+FLASH_TARGETS := $(addprefix $(STAMP_DIR)/.stamp-flash-, $(DEVICES)) $(addprefix $(STAMP_DIR)/.stamp-flash-btproxy-, $(BTPROXY_REPLICAS))
+COMPILE_TARGETS := $(addprefix $(STAMP_DIR)/.stamp-compile-, $(DEVICES)) $(addprefix $(STAMP_DIR)/.stamp-compile-btproxy-, $(BTPROXY_REPLICAS))
+
+ESPHOME_BIN := $(shell command -v esphome)
+$(shell mkdir -p $(STAMP_DIR) && echo "$(ESPHOME_BIN)" > $(STAMP_DIR)/.esphome-bin.tmp && cmp -s $(STAMP_DIR)/.esphome-bin.tmp $(STAMP_DIR)/.esphome-bin || mv $(STAMP_DIR)/.esphome-bin.tmp $(STAMP_DIR)/.esphome-bin; rm -f $(STAMP_DIR)/.esphome-bin.tmp)
+all: compile-all
+
+flash-all: $(FLASH_TARGETS)
+compile-all: $(COMPILE_TARGETS)
+
+clean:
+	rm -rf $(STAMP_DIR) .Makefile.deps
+
+# Convenience targets
+flash-%: $(STAMP_DIR)/.stamp-flash-%
+	@:
+compile-%: $(STAMP_DIR)/.stamp-compile-%
+	@:
+
+# Normal devices: compile
+$(STAMP_DIR)/.stamp-compile-%: %.yaml $(STAMP_DIR)/.esphome-bin
+	@mkdir -p $(STAMP_DIR)
+	esphome compile $<
+	@touch $@
+
+# Normal devices: flash
+$(STAMP_DIR)/.stamp-flash-%: %.yaml $(STAMP_DIR)/.esphome-bin
+	@mkdir -p $(STAMP_DIR)
+	esphome run --no-logs --device OTA $<
+	@touch $@
+
+# Special btproxy devices: compile
+$(STAMP_DIR)/.stamp-compile-btproxy-%: btproxy.yaml $(STAMP_DIR)/.esphome-bin
+	@mkdir -p $(STAMP_DIR)
+	esphome -s name btproxy-$* compile $<
+	@touch $@
+
+# Special btproxy devices: flash
+$(STAMP_DIR)/.stamp-flash-btproxy-%: btproxy.yaml $(STAMP_DIR)/.esphome-bin
+	@mkdir -p $(STAMP_DIR)
+	esphome -s name btproxy-$* run --no-logs --device OTA $<
+	@touch $@
+
+# Include generated dependencies
+-include .Makefile.deps
+
+# Rule to update dependencies
+.Makefile.deps: $(wildcard *.yaml) $(wildcard templates/*.yaml) generate_deps.py
+	@echo "Updating dependencies..."
+	@python3 generate_deps.py "$(DEVICES)" "$(BTPROXY_REPLICAS)" > $@
+
+.PHONY: all flash-all compile-all clean
diff --git a/README.md b/README.md
index 4052094..1104483 100644
--- a/README.md
+++ b/README.md
@@ -10,28 +10,41 @@ timezone when syncing the clock (NTP).
 
 ## Compiling
 
-```
+```bash
 $ cp -i secrets.yaml{.sample,}
 $ cp -i templates/secrets.yaml{.sample,}
 
 # Edit both secrets.yaml files.
 
-$ ./reflash.sh compile ''
+# Compile all devices in parallel (up to 4 jobs)
+$ nix develop --command make compile-all -j4
+
+# Or compile a single device
+$ nix develop --command make compile-bathroomheater
 ```
 
-## Running
+## Flashing
 
-```
-$ ./reflash.sh
+To flash all devices (automatically prioritizes OTA and skips prompts):
+
+```bash
+$ nix develop --command make flash-all -j4
 ```
 
-or
+To flash a single device:
 
-```
-$ esphome run file.yaml
+```bash
+$ nix develop --command make flash-bathroomheater
 ```
 
-Look up list of runnable configurations inside `reflash.sh` script.
+Alternatively, you can drop into the development shell and run `esphome` directly:
+
+```bash
+$ nix develop
+$ esphome run bathroomheater.yaml
+```
+
+**Note:** The Makefile automatically tracks dependencies (including `!include` files and local `external_components` directories). It will natively evaluate changes and only recompile what has actually changed since the last run.
 
 ## Running remotely
 
diff --git a/flake.lock b/flake.lock
index 13ef078..4bc1189 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,12 +1,72 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1767039857,
+        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "fw_nix": {
+      "inputs": {
+        "git-hooks": "git-hooks",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1783867522,
+        "narHash": "sha256-rJUjsQbVFWWFQ7Xwt69Ad76v7OIpDXbqzW25d+I2BBs=",
+        "owner": "futureware-tech",
+        "repo": "nix",
+        "rev": "e132e29c641ee55aba9ad08507ace53e19cf2b3e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "futureware-tech",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "git-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": [
+          "fw_nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1783008725,
+        "narHash": "sha256-jGiy6+sxjNWXSjp25uoJuNfyH9zBK1PEDY0lVoL4ibQ=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "bca82caa46d5ec0f5d422c61fb1e30bc51313cbe",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1783224372,
-        "narHash": "sha256-8i/87eeoqiGE4yOTjwSA3Eh/ziJRQEmd/unYU+K27sk=",
+        "lastModified": 1783776592,
+        "narHash": "sha256-UgCQzxeWI75XM8G+hPrPh+MKzEPjG3SpAj7dtqSbksA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d407951447dcd00442e97087bf374aad70c04cea",
+        "rev": "e7a3ca8092b61ff85b6a45bf863ea2b2d6a661b3",
         "type": "github"
       },
       "original": {
@@ -18,8 +78,24 @@
     },
     "root": {
       "inputs": {
+        "fw_nix": "fw_nix",
         "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",
diff --git a/flake.nix b/flake.nix
index 8c1c934..c259512 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,29 +3,72 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    fw_nix = {
+      url = "github:futureware-tech/nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs }:
+  outputs =
+    {
+      self,
+      nixpkgs,
+      fw_nix,
+    }:
     let
-      forAllSystems = f: nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
+          system:
+          f {
+            inherit system;
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
     in
     {
-      devShells = forAllSystems ({ pkgs }: {
-        default = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            esphome
-            esptool
-            cc2538-bsl
-            bash # for ./reflash.sh
-          ];
+      checks = forAllSystems (
+        { system, ... }: {
+          pre-commit-check = fw_nix.inputs.git-hooks.lib.${system}.run {
+            src = ./.;
+            hooks = fw_nix.lib.pre-commit.hooks // {
+              # Disable check-yaml because it fails on ESPHome's custom YAML tags (like !include, !secret)
+              check-yaml.enable = false;
+            };
+          };
+        }
+      );
 
-          shellHook = ''
-            echo -n "ESPHome "
-            esphome --version
-          '';
-        };
-      });
+      devShells = forAllSystems (
+        { system, pkgs, ... }:
+        let
+          esphome-fhs = pkgs.buildFHSEnv {
+            name = "esphome";
+            targetPkgs =
+              pkgs: with pkgs; [
+                esphome
+                zlib
+              ];
+            multiPkgs = pkgs: with pkgs; [ zlib ];
+            runScript = "esphome";
+          };
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              esphome-fhs
+              esptool
+              cc2538-bsl
+              gnumake
+            ];
+
+            shellHook = ''
+              ${self.checks.${system}.pre-commit-check.shellHook}
+              echo -n "ESPHome "
+              esphome --version
+            '';
+          };
+        }
+      );
     };
 }
diff --git a/generate_deps.py b/generate_deps.py
new file mode 100755
index 0000000..c1ed4bf
--- /dev/null
+++ b/generate_deps.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+import sys
+import re
+from pathlib import Path
+
+
+def get_deps(file_path, visited=None):
+    if visited is None:
+        visited = set()
+    if str(file_path) in visited:
+        return set()
+    visited.add(str(file_path))
+
+    deps = set()
+    p = Path(file_path)
+    if not p.is_file():
+        return deps
+
+    with open(p, "r", encoding="utf-8") as f:
+        content = f.read()
+
+    matches = re.findall(r"!include\s+([a-zA-Z0-9_/-]+\.yaml)", content)
+    for match in matches:
+        # Resolve path relative to the file being processed
+        if match.startswith("/"):
+            dep_path = Path(match)
+        else:
+            dep_path = (p.parent / match).resolve().relative_to(Path.cwd())
+
+        deps.add(str(dep_path))
+        deps.update(get_deps(dep_path, visited))
+
+    # Also track local external_components directories
+    source_matches = re.findall(r"source:\s+([a-zA-Z0-9_/-]+)", content)
+    for match in source_matches:
+        if match.startswith("/"):
+            source_dir = Path(match)
+        else:
+            source_dir = (p.parent / match).resolve().relative_to(Path.cwd())
+
+        if source_dir.is_dir():
+            for f in source_dir.rglob("*"):
+                if f.is_file():
+                    deps.add(str(f))
+
+    return deps
+
+
+def main():
+    devices = sys.argv[1].split()
+    btproxy_replicas = sys.argv[2].split()
+
+    for device in devices:
+        yaml_file = f"{device}.yaml"
+        if not Path(yaml_file).is_file():
+            continue
+
+        deps = get_deps(yaml_file)
+        if deps:
+            deps_str = " ".join(sorted(deps))
+            print(f"$(STAMP_DIR)/.stamp-compile-{device}: {deps_str}")
+            print(f"$(STAMP_DIR)/.stamp-flash-{device}: {deps_str}")
+
+    if Path("btproxy.yaml").is_file():
+        deps = get_deps("btproxy.yaml")
+        if deps:
+            deps_str = " ".join(sorted(deps))
+            for replica in btproxy_replicas:
+                print(f"$(STAMP_DIR)/.stamp-compile-btproxy-{replica}: {deps_str}")
+                print(f"$(STAMP_DIR)/.stamp-flash-btproxy-{replica}: {deps_str}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/reflash.sh b/reflash.sh
deleted file mode 100755
index 123c31d..0000000
--- a/reflash.sh
+++ /dev/null
@@ -1,104 +0,0 @@
-#!/usr/bin/env bash
-# Build a full list of known esphome devices and
-#   - reflash them
-#   - reflash those that match $1
-#   - do $1 to those that match $2
-#
-# Ex.: ./reflash.sh logs car
-
-set -e
-
-if [ $# -gt 1 ]; then
-	command=$1
-	shift
-else
-	command="run --no-logs"
-fi
-
-declare -a flash
-
-for config in \
-		bathroomheater.yaml \
-		blinds.yaml \
-		heating.yaml \
-		loud-siren.yaml \
-		watermeter.yaml \
-		heating-eg.yaml \
-		heating-og.yaml \
-		car-charger.yaml \
-		freezer.yaml \
-		living-room-entertainment.yaml \
-		living-room-infra.yaml \
-		outdoor-equipment.yaml \
-		storage-heater.yaml \
-		basement-dehum.yaml \
-		zigbee-coordinator-ch24.yaml \
-		zigbee-coordinator-ch25.yaml \
-		child-west-ac.yaml \
-		child-east-ac.yaml \
-		spare-power-meter.yaml \
-		office-desk-north.yaml \
-		shadow-udmp.yaml \
-		attic-central.yaml \
-		office-rack.yaml \
-		radiation.yaml \
-		cat-feeder-cam.yaml \
-		btproxy-laundry.yaml \
-		garage-gate.yaml \
-		irrigation.yaml \
-		tools-power.yaml; do
-	flash+=("${command?} ${config?}")
-done
-
-if [[ "$command" == run* ]] || [[ "$command" == upload* ]] || [[ "$command" == logs* ]] || [[ "$command" == log* ]]; then
-	for btproxy_replica in \
-		c25bac \
-		c2577c \
-		c25b74
-	do
-		flash+=("${command?} btproxy.yaml --device btproxy-${btproxy_replica?}")
-	done
-else
-	flash+=("${command?} btproxy.yaml")
-fi
-
-declare -A flash_result
-
-print_results_table() {
-	printf -- "-%.0s" {1..80}
-	printf "\n%-70sSTATUS\n\n" "COMMAND"
-	for result_cmdline in "${flash[@]}"; do
-		printf "%-70s" "$result_cmdline "
-		if [[ -v flash_result["$result_cmdline"] ]]; then
-			echo "${flash_result["$result_cmdline"]}"
-		else
-			echo "N/A"
-		fi
-	done
-	printf "\n%-70s%d\n" "TOTAL" "${#flash[@]}"
-	printf -- "-%.0s" {1..80}
-	echo
-	echo
-}
-
-for cmdline in "${flash[@]}"; do
-	if [ $# -gt 0 ]; then
-		if [[ "$cmdline" =~ $1 ]]; then
-			:;
-		else
-			flash_result["$cmdline"]=SKIPPED
-			continue
-		fi
-	fi
-	flash_result["$cmdline"]=CURRENT
-
-	print_results_table
-	echo "Launching esphome: $cmdline"
-	if echo 1 | esphome $cmdline; then
-		flash_result["$cmdline"]=OK
-	else
-		flash_result["$cmdline"]=FAIL
-	fi
-done
-
-print_results_table