diff --git a/cmd/load/main.go b/cmd/load/main.go
new file mode 100644
index 0000000..4204e88
--- /dev/null
+++ b/cmd/load/main.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"time"
+
+	"github.com/theater/picomap/lib/picoserial"
+	"github.com/theater/picomap/lib/picotool"
+)
+
+func main() {
+	wd, err := os.Getwd()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+	buildDir := filepath.Join(wd, "build")
+
+	if err := run(buildDir); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run(buildDir string) error {
+	fmt.Println("Building...")
+	cmd := exec.Command("make", "-C", buildDir)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("build failed: %w", err)
+	}
+
+	dev, err := picoserial.FindDevice()
+	if err != nil {
+		return err
+	}
+	if dev != "" {
+		fmt.Printf("Sending 'b' to %s to enter BOOTSEL mode...\n", dev)
+		if err := picoserial.SendByte(dev, 'b'); err != nil {
+			return err
+		}
+		time.Sleep(2 * time.Second)
+	}
+
+	uf2 := filepath.Join(buildDir, "picomap.uf2")
+	fmt.Println("Loading firmware...")
+	if err := picotool.Load(uf2); err != nil {
+		return err
+	}
+
+	fmt.Println("Rebooting...")
+	_ = picotool.Reboot()
+
+	fmt.Println("Done.")
+	return nil
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a29da21
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module github.com/theater/picomap
+
+go 1.25.0
+
+require go.bug.st/serial v1.6.4
+
+require (
+	github.com/creack/goselect v0.1.2 // indirect
+	golang.org/x/sys v0.19.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..df37244
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,14 @@
+github.com/creack/goselect v0.1.2 h1:2DNy14+JPjRBgPzAd1thbQp4BSIihxcBf0IXhQXDRa0=
+github.com/creack/goselect v0.1.2/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+go.bug.st/serial v1.6.4 h1:7FmqNPgVp3pu2Jz5PoPtbZ9jJO5gnEnZIvnI1lzve8A=
+go.bug.st/serial v1.6.4/go.mod h1:nofMJxTeNVny/m6+KaafC6vJGj3miwQZ6vW4BZUGJPI=
+golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
+golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/lib/picoserial/picoserial.go b/lib/picoserial/picoserial.go
new file mode 100644
index 0000000..4bf7618
--- /dev/null
+++ b/lib/picoserial/picoserial.go
@@ -0,0 +1,35 @@
+package picoserial
+
+import (
+	"fmt"
+
+	"go.bug.st/serial"
+	"go.bug.st/serial/enumerator"
+)
+
+func FindDevice() (string, error) {
+	ports, err := enumerator.GetDetailedPortsList()
+	if err != nil {
+		return "", fmt.Errorf("enumerating ports: %w", err)
+	}
+	for _, p := range ports {
+		if p.IsUSB {
+			return p.Name, nil
+		}
+	}
+	return "", nil
+}
+
+func SendByte(portName string, b byte) error {
+	port, err := serial.Open(portName, &serial.Mode{BaudRate: 115200})
+	if err != nil {
+		return fmt.Errorf("opening %s: %w", portName, err)
+	}
+	defer port.Close()
+
+	_, err = port.Write([]byte{b})
+	if err != nil {
+		return fmt.Errorf("writing to %s: %w", portName, err)
+	}
+	return nil
+}
diff --git a/lib/picotool/picotool.go b/lib/picotool/picotool.go
new file mode 100644
index 0000000..0777e4a
--- /dev/null
+++ b/lib/picotool/picotool.go
@@ -0,0 +1,24 @@
+package picotool
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+func Load(uf2Path string) error {
+	cmd := exec.Command("picotool", "load", "-f", uf2Path)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("picotool load: %w\n%s", err, out)
+	}
+	return nil
+}
+
+func Reboot() error {
+	cmd := exec.Command("picotool", "reboot")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("picotool reboot: %w\n%s", err, out)
+	}
+	return nil
+}
diff --git a/load.sh b/load.sh
deleted file mode 100755
index 481625e..0000000
--- a/load.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/bin/bash
-set -e
-
-BUILDDIR="$(dirname "$0")/build"
-
-echo "Building..."
-make -C "$BUILDDIR"
-
-DEV=$(ls /dev/cu.usbmodem* 2>/dev/null | head -1)
-if [ -n "$DEV" ]; then
-    echo "Sending 'b' to $DEV to enter BOOTSEL mode..."
-    printf 'b' > "$DEV"
-    sleep 2
-fi
-
-echo "Loading firmware..."
-picotool load -f "$BUILDDIR/picomap.uf2"
-
-echo "Rebooting..."
-picotool reboot || true
-
-echo "Done."