diff --git a/src/Firmware.cs b/src/Firmware.cs
index fab0e47..235887c 100644
--- a/src/Firmware.cs
+++ b/src/Firmware.cs
@@ -5,6 +5,7 @@
 using System.Text.RegularExpressions;
 using Bonsai.Harp;
 using YamlDotNet.Core;
+using YamlDotNet.Core.Events;
 using YamlDotNet.Serialization;
 using YamlDotNet.Serialization.NamingConventions;
 
@@ -167,16 +168,20 @@ public class PortPinInfo
     /// <summary>
     /// Specifies the microcontroller port where the pin is located.
     /// </summary>
+    [YamlMember(Order = -1)]
     public string Port;
 
     /// <summary>
     /// Specifies the unique pin number in the defined port.
     /// </summary>
+    [YamlMember(Order = -1, DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public int PinNumber;
 
     /// <summary>
     /// Specifies whether the pin will be used as input or output.
     /// </summary>
+    [YamlConverter(typeof(LowerCaseEnumTypeConverter))]
+    [YamlMember(Order = -1, DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public PinDirection Direction;
 
     /// <summary>
@@ -193,21 +198,27 @@ public class InputPinInfo : PortPinInfo
     /// <summary>
     /// Specifies how the input pin is configured to handle floating inputs.
     /// </summary>
+    [YamlConverter(typeof(LowerCaseEnumTypeConverter))]
+    [YamlMember(DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public InputPinMode PinMode;
 
     /// <summary>
     /// Specifies when the interrupt event for this pin should be triggered.
     /// </summary>
+    [YamlConverter(typeof(LowerCaseEnumTypeConverter))]
     public TriggerMode TriggerMode;
 
     /// <summary>
     /// Specifies the priority of the interrupt event for this pin.
     /// </summary>
+    [YamlConverter(typeof(LowerCaseEnumTypeConverter))]
+    [YamlMember(DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public InterruptPriority InterruptPriority;
 
     /// <summary>
     /// Specifies the interrupt number associated with this pin.
     /// </summary>
+    [YamlMember(DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public int InterruptNumber;
 }
 
@@ -219,16 +230,20 @@ public class OutputPinInfo : PortPinInfo
     /// <summary>
     /// Specifies whether reading the state of the output pin is allowed.
     /// </summary>
+    [YamlMember(DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public bool AllowRead;
 
     /// <summary>
     /// Specifies the output pin wiring configuration.
     /// </summary>
+    [YamlConverter(typeof(CamelCaseEnumTypeConverter))]
     public OutputPinMode PinMode;
 
     /// <summary>
     /// Specifies the initial state of the output pin at boot time.
     /// </summary>
+    [YamlConverter(typeof(LowerCaseEnumTypeConverter))]
+    [YamlMember(DefaultValuesHandling = DefaultValuesHandling.Preserve)]
     public LogicState InitialState;
 
     /// <summary>
@@ -373,6 +388,38 @@ public void WriteYaml(IEmitter emitter, object value, Type type, ObjectSerialize
     }
 }
 
+class LowerCaseEnumTypeConverter : IYamlTypeConverter
+{
+    public static readonly LowerCaseEnumTypeConverter Instance = new();
+
+    public bool Accepts(Type type) => false;
+
+    public object? ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeserializer) => rootDeserializer(type);
+
+    public void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer)
+    {
+        var scalarStyle = ScalarStyle.Any;
+        var scalarValue = LowerCaseNamingConvention.Instance.Apply(value.ToString());
+        if (scalarValue == "off")
+            scalarStyle = ScalarStyle.DoubleQuoted;
+        emitter.Emit(new Scalar(AnchorName.Empty, TagName.Empty, scalarValue, scalarStyle, true, true));
+    }
+}
+
+class CamelCaseEnumTypeConverter : IYamlTypeConverter
+{
+    public static readonly CamelCaseEnumTypeConverter Instance = new();
+
+    public bool Accepts(Type type) => false;
+
+    public object? ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeserializer) => rootDeserializer(type);
+
+    public void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer)
+    {
+        emitter.Emit(new Scalar(CamelCaseNamingConvention.Instance.Apply(value.ToString())));
+    }
+}
+
 /// <summary>
 /// Translates property names into screaming snake case following the current
 /// ATxmega register naming convention.
diff --git a/src/MetadataDeserializer.cs b/src/MetadataDeserializer.cs
index 52cdbcc..1fb58e6 100644
--- a/src/MetadataDeserializer.cs
+++ b/src/MetadataDeserializer.cs
@@ -18,6 +18,8 @@ public static class MetadataDeserializer
         .WithTypeConverter(MaskValueTypeConverter.Instance)
         .WithTypeConverter(HarpVersionTypeConverter.Instance)
         .WithTypeConverter(HexValueTypeConverter.Instance)
+        .WithTypeConverter(LowerCaseEnumTypeConverter.Instance)
+        .WithTypeConverter(CamelCaseEnumTypeConverter.Instance)
         .WithPortPinInfoTypeConverter()
         .Build();
 
diff --git a/src/MetadataSerializer.cs b/src/MetadataSerializer.cs
index e12df9b..9c7ee9a 100644
--- a/src/MetadataSerializer.cs
+++ b/src/MetadataSerializer.cs
@@ -18,6 +18,8 @@ public static class MetadataSerializer
         .WithTypeConverter(MaskValueTypeConverter.Instance)
         .WithTypeConverter(HarpVersionTypeConverter.Instance)
         .WithTypeConverter(HexValueTypeConverter.Instance)
+        .WithTypeConverter(LowerCaseEnumTypeConverter.Instance)
+        .WithTypeConverter(CamelCaseEnumTypeConverter.Instance)
         .ConfigureDefaultValuesHandling(
             DefaultValuesHandling.OmitNull |
             DefaultValuesHandling.OmitDefaults |
diff --git a/tests/Metadata/device.ios.yml b/tests/Metadata/device.ios.yml
index 01284ab..1cabdf6 100644
--- a/tests/Metadata/device.ios.yml
+++ b/tests/Metadata/device.ios.yml
@@ -1,5 +1,3 @@
-%YAML 1.1
----
 # yaml-language-server: $schema=https://harp-tech.org/draft-02/schema/ios.json
 DO3:
   port: PORTC
@@ -56,19 +54,19 @@ POKE0_IR:
   port: PORTD
   pinNumber: 4
   direction: input
-  interruptNumber: 0
-  interruptPriority: low
-  triggerMode: toggle
   pinMode: pullup
+  triggerMode: toggle
+  interruptPriority: low
+  interruptNumber: 0
   description: Poke 0 infrared
 POKE0_IO:
   port: PORTD
   pinNumber: 5
   direction: input
-  interruptNumber: 0
-  interruptPriority: "off"
-  triggerMode: toggle
   pinMode: pullup
+  triggerMode: toggle
+  interruptPriority: "off"
+  interruptNumber: 0
   description: Poke 0 DIO
 POKE0_LED:
   port: PORTD
@@ -88,19 +86,19 @@ POKE1_IR:
   port: PORTE
   pinNumber: 4
   direction: input
-  interruptNumber: 0
-  interruptPriority: low
-  triggerMode: toggle
   pinMode: pullup
+  triggerMode: toggle
+  interruptPriority: low
+  interruptNumber: 0
   description: Poke 1 infrared
 POKE1_IO:
   port: PORTE
   pinNumber: 5
   direction: input
-  interruptNumber: 0
-  interruptPriority: "off"
-  triggerMode: toggle
   pinMode: pullup
+  triggerMode: toggle
+  interruptPriority: "off"
+  interruptNumber: 0
   description: Poke 1 DIO
 POKE1_LED:
   port: PORTE
@@ -120,19 +118,19 @@ POKE2_IR:
   port: PORTF
   pinNumber: 4
   direction: input
-  interruptNumber: 0
-  interruptPriority: low
-  triggerMode: toggle
   pinMode: pullup
+  triggerMode: toggle
+  interruptPriority: low
+  interruptNumber: 0
   description: Poke 2 infrared
 POKE2_IO:
   port: PORTF
   pinNumber: 5
   direction: input
-  interruptNumber: 0
-  interruptPriority: "off"
-  triggerMode: toggle
   pinMode: pullup
+  triggerMode: toggle
+  interruptPriority: "off"
+  interruptNumber: 0
   description: Poke 2 DIO
 POKE2_LED:
   port: PORTF
@@ -152,17 +150,17 @@ ADC1_AVAILABLE:
   port: PORTJ
   pinNumber: 0
   direction: input
-  interruptNumber: 0
-  interruptPriority: "off"
-  triggerMode: toggle
   pinMode: pulldown
+  triggerMode: toggle
+  interruptPriority: "off"
+  interruptNumber: 0
   description: ADC1 is available on hardware
 DI3:
   port: PORTH
   pinNumber: 0
   direction: input
-  interruptNumber: 0
-  interruptPriority: low
-  triggerMode: toggle
   pinMode: tristate
+  triggerMode: toggle
+  interruptPriority: low
+  interruptNumber: 0
   description: Input DI3
diff --git a/tests/MetadataSerializerTests.cs b/tests/MetadataSerializerTests.cs
index b5916bf..f5bb566 100644
--- a/tests/MetadataSerializerTests.cs
+++ b/tests/MetadataSerializerTests.cs
@@ -34,15 +34,16 @@ private static string NormalizeYaml(string contents)
     }
 
     [DataTestMethod]
-    [DataRow("core.yml")]
-    [DataRow("device.yml")]
-    public void DeviceMetadata_RoundTripSerializes(string metadataFileName)
+    [DataRow("core.yml", typeof(DeviceInfo))]
+    [DataRow("device.yml", typeof(DeviceInfo))]
+    [DataRow("device.ios.yml", typeof(Dictionary<string, PortPinInfo>))]
+    public void Metadata_RoundTripSerializes(string metadataFileName, Type type)
     {
         metadataFileName = TestHelper.GetMetadataPath(metadataFileName);
         var metadataContents = File.ReadAllText(metadataFileName);
         metadataContents = NormalizeYaml(metadataContents);
 
-        var deviceMetadata = MetadataDeserializer.Instance.Deserialize<DeviceInfo>(metadataContents);
+        var deviceMetadata = MetadataDeserializer.Instance.Deserialize(metadataContents, type);
         var roundTripContents = MetadataSerializer.Instance.Serialize(deviceMetadata);
         try
         {