diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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diff --git a/mu-lens.cabal b/mu-lens.cabal
new file mode 100644
--- /dev/null
+++ b/mu-lens.cabal
@@ -0,0 +1,36 @@
+name:          mu-lens
+version:       0.3.0.0
+synopsis:      Lenses for @mu-schema@ terms
+description:
+  With @mu-schema@ you can describe schemas using type-level constructs, and derive serializers from those. This package provides convenient access using @lens@es.
+
+license:       Apache-2.0
+license-file:  LICENSE
+author:        Andre Marianiello
+maintainer:    alejandro.serrano@47deg.com
+copyright:     Copyright © 2019-2020 <http://47deg.com 47 Degrees>
+category:      Network
+build-type:    Simple
+cabal-version: >=1.10
+homepage:      https://higherkindness.io/mu-haskell/
+bug-reports:   https://github.com/higherkindness/mu-haskell/issues
+
+source-repository head
+  type:     git
+  location: https://github.com/higherkindness/mu-haskell
+
+library
+  exposed-modules:  Mu.Schema.Lens
+  build-depends:
+      base         >=4.12 && <5
+    , containers
+    , lens
+    , generic-lens
+    , mu-schema
+    , mu-rpc
+    , sop-core
+    , text
+
+  hs-source-dirs:   src
+  default-language: Haskell2010
+  ghc-options:      -Wall
diff --git a/src/Mu/Schema/Lens.hs b/src/Mu/Schema/Lens.hs
new file mode 100644
--- /dev/null
+++ b/src/Mu/Schema/Lens.hs
@@ -0,0 +1,395 @@
+{-# language AllowAmbiguousTypes    #-}
+{-# language DataKinds              #-}
+{-# language FlexibleContexts       #-}
+{-# language FlexibleInstances      #-}
+{-# language FunctionalDependencies #-}
+{-# language GADTs                  #-}
+{-# language InstanceSigs           #-}
+{-# language LambdaCase             #-}
+{-# language OverloadedLabels       #-}
+{-# language PartialTypeSignatures  #-}
+{-# language PolyKinds              #-}
+{-# language QuantifiedConstraints  #-}
+{-# language RankNTypes             #-}
+{-# language ScopedTypeVariables    #-}
+{-# language TypeApplications       #-}
+{-# language TypeFamilies           #-}
+{-# language TypeOperators          #-}
+{-# language UndecidableInstances   #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module Mu.Schema.Lens (
+  record,
+  is
+) where
+
+import           Control.Lens
+import           Data.Kind
+import           Data.Map
+import           Data.SOP
+import qualified Data.Text            as T
+
+
+import           GHC.Int
+import           GHC.OverloadedLabels
+import           GHC.TypeLits         hiding (Nat)
+import           Mu.Schema
+
+is :: s -> APrism' s () -> Bool
+is s l = not $ isn't l s
+
+-- we need structurally inductive Nats
+data Nat = Zero | Succ Nat
+
+record :: BuildRecord sch args r => r -> Term sch ('DRecord name args)
+record = TRecord . buildR
+
+class BuildRecord (sch :: Schema Symbol Symbol) (args :: [FieldDef Symbol Symbol]) (r :: Type) | sch args -> r where
+  buildR :: r -> NP (Field sch) args
+
+instance
+  {-# OVERLAPPABLE #-}
+  ( Interpret sch fieldType ~ r,
+    Uninterpret r ~ fieldType,
+    UninterpretField sch r
+  ) =>
+  BuildRecord
+    sch
+    '[ 'FieldDef fieldName fieldType
+     ]
+    r
+  where
+  buildR val = Field (toFieldValue val) :* Nil
+
+instance
+  ( Interpret sch fieldType1 ~ v1,
+    Interpret sch fieldType2 ~ v2,
+    Uninterpret v1 ~ fieldType1,
+    Uninterpret v2 ~ fieldType2,
+    All (UninterpretField sch) '[v1, v2]
+  ) =>
+  BuildRecord
+    sch
+    '[ 'FieldDef fieldName1 fieldType1,
+       'FieldDef fieldName2 fieldType2
+     ]
+    (v1, v2)
+  where
+  buildR (v1, v2) = Field (toFieldValue v1) :* Field (toFieldValue v2) :* Nil
+
+instance
+  ( Interpret sch fieldType1 ~ v1,
+    Interpret sch fieldType2 ~ v2,
+    Interpret sch fieldType3 ~ v3,
+    Uninterpret v1 ~ fieldType1,
+    Uninterpret v2 ~ fieldType2,
+    Uninterpret v3 ~ fieldType3,
+    All (UninterpretField sch) '[v1, v2, v3]
+  ) =>
+  BuildRecord
+    sch
+    '[ 'FieldDef fieldName1 fieldType1,
+       'FieldDef fieldName2 fieldType2,
+       'FieldDef fieldName3 fieldType3
+     ]
+    (v1, v2, v3)
+  where
+  buildR (v1, v2, v3) =
+    Field (toFieldValue v1)
+      :* Field (toFieldValue v2)
+      :* Field (toFieldValue v3)
+      :* Nil
+
+instance
+  ( Functor f,
+    HasFieldIx (IndexOf fieldName fields) fields fields' fieldType fieldType',
+    Interpret sch fieldType ~ fieldValue,
+    Interpret sch fieldType' ~ fieldValue',
+    Uninterpret fieldValue ~ fieldType,
+    Uninterpret fieldValue' ~ fieldType',
+    UninterpretField sch fieldValue'
+  ) =>
+  IsLabel
+    fieldName
+    ( (fieldValue -> f fieldValue') ->
+      (Term sch ('DRecord name fields) -> f (Term sch ('DRecord name fields')))
+    )
+  where
+  fromLabel = field @fieldName
+
+instance
+  forall choiceName p f sch name choiceDefs choiceDefs' choiceType choiceType'.
+  ( Choice p,
+    Applicative f,
+    HasChoiceIx (ChoiceIndexOf choiceName choiceDefs) choiceDefs choiceDefs' choiceType choiceType'
+  ) =>
+  IsLabel
+    choiceName
+    ( p choiceType (f choiceType') ->
+      p (Term sch ('DEnum name choiceDefs)) (f (Term sch ('DEnum name choiceDefs')))
+    )
+  where
+  fromLabel = choose @choiceName
+
+choose ::
+  forall (choiceName :: Symbol) sch name choiceDefs choiceDefs' choiceType choiceType'.
+  (HasChoiceIx (ChoiceIndexOf choiceName choiceDefs) choiceDefs choiceDefs' choiceType choiceType') =>
+  Prism
+    (Term sch ('DEnum name choiceDefs))
+    (Term sch ('DEnum name choiceDefs'))
+    choiceType
+    choiceType'
+choose = chooseIx @(ChoiceIndexOf choiceName choiceDefs)
+
+class
+  HasChoiceIx
+    (choiceIndex :: Nat)
+    (choiceDefs :: [ChoiceDef Symbol])
+    (choiceDefs' :: [ChoiceDef Symbol])
+    choiceType
+    choiceType'
+    | choiceIndex choiceDefs -> choiceType,
+      choiceIndex choiceDefs' -> choiceType',
+      choiceIndex choiceDefs choiceType' -> choiceDefs',
+      choiceIndex choiceDefs' choiceType -> choiceDefs where
+  chooseIx ::
+    Prism
+      (Term sch ('DEnum name choiceDefs))
+      (Term sch ('DEnum name' choiceDefs'))
+      choiceType
+      choiceType'
+
+instance
+  HasChoiceIx
+    'Zero
+    ('ChoiceDef choiceName ': choiceDefs)
+    ('ChoiceDef choiceName ': choiceDefs)
+    ()
+    ()
+  where
+  chooseIx f = dimap project (either pure (fmap inject)) (right' f)
+    where
+      inject :: () -> Term sch ('DEnum name ('ChoiceDef choiceName ': choiceDefs))
+      inject () = TEnum (Z (Proxy @('ChoiceDef choiceName)))
+      project ::
+        Term sch ('DEnum name ('ChoiceDef choiceName ': choiceDefs)) ->
+        Either (Term sch ('DEnum name' ('ChoiceDef choiceName' ': choiceDefs))) ()
+      project term = case term of
+        TEnum (Z Proxy) -> Right ()
+        _               -> Left (TEnum (Z Proxy))
+
+instance
+  (HasChoiceIx choiceIndex choiceDefs choiceDefs' choiceType choiceType') =>
+  HasChoiceIx
+    ('Succ choiceIndex)
+    (choiceDef ': choiceDefs)
+    (choiceDef ': choiceDefs')
+    choiceType
+    choiceType'
+  where
+  chooseIx f =
+    dimap
+      project
+      inject
+      (right' (chooseIx @choiceIndex @choiceDefs @choiceDefs' f))
+    where
+      project ::
+        Term sch ('DEnum name (choiceDef ': choiceDefs)) ->
+        Either () (Term sch ('DEnum name choiceDefs))
+      project (TEnum (Z Proxy)) = Left ()
+      project (TEnum (S inner)) = Right (TEnum inner)
+      inject ::
+        Applicative f =>
+        Either () (f (Term sch ('DEnum name choiceDefs'))) ->
+        f (Term sch ('DEnum name (choiceDef ': choiceDefs')))
+      inject (Left ())     = pure (TEnum (Z Proxy))
+      inject (Right inner) = fmap wrap inner
+      wrap :: Term sch ('DEnum name choiceDefs') -> Term sch ('DEnum name (choiceDef ': choiceDefs'))
+      wrap (TEnum choices) = TEnum (S choices)
+
+field ::
+  forall fieldName sch name fieldDefs fieldDefs' fieldType fieldType' fieldValue fieldValue'.
+  (HasFieldIx (IndexOf fieldName fieldDefs) fieldDefs fieldDefs' fieldType fieldType') =>
+  ( HasFieldIx (IndexOf fieldName fieldDefs) fieldDefs fieldDefs' fieldType fieldType',
+    Interpret sch fieldType ~ fieldValue,
+    Interpret sch fieldType' ~ fieldValue',
+    Uninterpret fieldValue ~ fieldType,
+    Uninterpret fieldValue' ~ fieldType',
+    UninterpretField sch fieldValue'
+  ) =>
+  Lens
+    (Term sch ('DRecord name fieldDefs))
+    (Term sch ('DRecord name fieldDefs'))
+    fieldValue
+    fieldValue'
+field = fieldValueName @fieldName . interpretIso
+
+fieldValueName ::
+  forall fieldName sch name fieldDefs fieldDefs' fieldType fieldType'.
+  (HasFieldIx (IndexOf fieldName fieldDefs) fieldDefs fieldDefs' fieldType fieldType') =>
+  Lens
+    (Term sch ('DRecord name fieldDefs))
+    (Term sch ('DRecord name fieldDefs'))
+    (FieldValue sch fieldType)
+    (FieldValue sch fieldType')
+fieldValueName = fieldValueIx @(IndexOf fieldName fieldDefs)
+
+type family IndexOf (fieldName :: fieldNameKind) (fieldDefs :: [FieldDefB builtin fieldNameKind typeNameKind]) :: Nat where
+  IndexOf fieldName ('FieldDef fieldName _ ': _) = 'Zero
+  IndexOf fieldName (_ ': fieldDefs) = 'Succ (IndexOf fieldName fieldDefs)
+  IndexOf fieldName '[] = TypeError ('Text "does not contain field name " ':<>: 'ShowType fieldName)
+
+type family
+  ChoiceIndexOf
+    (choiceName :: choiceNameKind)
+    (choiceDefs :: [ChoiceDef choiceNameKind]) ::
+    Nat where
+  ChoiceIndexOf choiceName ('ChoiceDef choiceName : _) = 'Zero
+  ChoiceIndexOf choiceName (_ ': choiceDefs) = 'Succ (ChoiceIndexOf choiceName choiceDefs)
+
+class
+  HasFieldIx
+    (fieldIndex :: Nat)
+    (fieldDefs :: [FieldDef Symbol Symbol])
+    (fieldDefs' :: [FieldDef Symbol Symbol])
+    (fieldType :: FieldType Symbol)
+    (fieldType' :: FieldType Symbol)
+    | fieldIndex fieldDefs -> fieldType,
+      fieldIndex fieldDefs' -> fieldType',
+      fieldIndex fieldDefs fieldType' -> fieldDefs',
+      fieldIndex fieldDefs' fieldType -> fieldDefs where
+  fieldValueIx ::
+    Lens
+      (Term sch ('DRecord name fieldDefs))
+      (Term sch ('DRecord name' fieldDefs'))
+      (FieldValue sch fieldType)
+      (FieldValue sch fieldType')
+
+instance
+  HasFieldIx
+    'Zero
+    ('FieldDef fieldName fieldType ': fieldDefs)
+    ('FieldDef fieldName fieldType' ': fieldDefs)
+    fieldType
+    fieldType'
+  where
+  fieldValueIx f (TRecord (Field fieldValue :* fields)) = TRecord . (:* fields) . Field <$> f fieldValue
+
+instance
+  ( HasFieldIx
+      fieldIndex
+      fieldDefs
+      fieldDefs'
+      fieldType
+      fieldType'
+  ) =>
+  HasFieldIx ('Succ fieldIndex) (fieldDef ': fieldDefs) (fieldDef ': fieldDefs') fieldType fieldType'
+  where
+  fieldValueIx f (TRecord (firstField :* restOfFields)) =
+    wrap <$> fieldValueIx @fieldIndex f (TRecord restOfFields)
+    where
+      wrap (TRecord fields) = TRecord (firstField :* fields)
+
+interpretIso ::
+  ( Uninterpret (Interpret sch fieldType') ~ fieldType',
+    UninterpretField sch (Interpret sch fieldType')
+  ) =>
+  Iso (FieldValue sch fieldType) (FieldValue sch fieldType') (Interpret sch fieldType) (Interpret sch fieldType')
+interpretIso = dimap fromFieldValue (fmap toFieldValue)
+
+type family Interpret (sch :: Schema typeName fieldName) (fieldType :: FieldType typeName) :: Type where
+  Interpret _ 'TNull = ()
+  Interpret _ ('TPrimitive builtin) = builtin
+  Interpret sch ('TSchematic typeName) = Term sch (sch :/: typeName)
+  Interpret sch ('TOption innerType) = Maybe (Interpret sch innerType)
+  Interpret sch ('TList innerType) = [Interpret sch innerType]
+  Interpret sch ('TMap keyType valueType) = Map (Interpret sch keyType) (Interpret sch valueType)
+  Interpret sch ('TUnion choiceTypes) = NS Identity (InterpretList sch choiceTypes)
+
+type family InterpretList sch (fieldTypes :: [FieldType typeName]) :: [Type] where
+  InterpretList _ '[] = '[]
+  InterpretList sch (t ': ts) = (Interpret sch t ': InterpretList sch ts)
+
+fromFieldValue :: FieldValue sch fieldType -> Interpret sch fieldType
+fromFieldValue = \case
+  FNull -> ()
+  (FPrimitive val) -> val
+  (FSchematic term) -> term
+  (FOption maybeFieldValue) -> fromFieldValue <$> maybeFieldValue
+  (FList listFieldValues) -> fromFieldValue <$> listFieldValues
+  (FMap mapFieldValues) -> mapKeysMonotonic fromFieldValue (fromFieldValue <$> mapFieldValues)
+  (FUnion (Z val)) -> Z (Identity (fromFieldValue val))
+  (FUnion (S val)) -> S (fromFieldValue (FUnion val))
+
+class UninterpretField sch a where
+  type Uninterpret a :: FieldType typeName
+  toFieldValue :: a -> FieldValue sch (Uninterpret a)
+
+instance UninterpretField sch () where
+  type Uninterpret () = 'TNull
+  toFieldValue () = FNull
+
+instance UninterpretField sch Integer where
+  type Uninterpret Integer = 'TPrimitive Integer
+  toFieldValue = FPrimitive
+
+instance UninterpretField sch Int32 where
+  type Uninterpret Int32 = 'TPrimitive Int32
+  toFieldValue = FPrimitive
+
+instance UninterpretField sch Int where
+  type Uninterpret Int = 'TPrimitive Int
+  toFieldValue = FPrimitive
+
+instance UninterpretField sch T.Text where
+  type Uninterpret T.Text = 'TPrimitive T.Text
+  toFieldValue = FPrimitive
+
+instance
+  ((sch :/: recordName) ~ 'DRecord recordName fieldDefs, sch ~ sch') =>
+  UninterpretField sch (Term sch' ('DRecord recordName fieldDefs))
+  where
+  type Uninterpret (Term sch' ('DRecord recordName fieldDefs)) = 'TSchematic recordName
+  toFieldValue = FSchematic
+
+instance
+  ((sch :/: enumName) ~ 'DEnum enumName choiceDefs) =>
+  UninterpretField sch (Term sch ('DEnum enumName choiceDefs))
+  where
+  type Uninterpret (Term sch ('DEnum enumName choiceDefs)) = 'TSchematic enumName
+  toFieldValue = FSchematic
+
+instance (UninterpretField sch a) => UninterpretField sch (Maybe a) where
+  type Uninterpret (Maybe a) = 'TOption (Uninterpret a)
+  toFieldValue = FOption . fmap toFieldValue
+
+instance (UninterpretField sch a) => UninterpretField sch [a] where
+  type Uninterpret [a] = 'TList (Uninterpret a)
+  toFieldValue = FList . fmap toFieldValue
+
+instance
+  (Ord (FieldValue sch (Uninterpret k)), UninterpretField sch k, UninterpretField sch v) =>
+  UninterpretField sch (Map k v)
+  where
+  type Uninterpret (Map k v) = 'TMap (Uninterpret k) (Uninterpret v)
+  toFieldValue = FMap . mapKeysMonotonic toFieldValue . fmap toFieldValue
+
+instance
+  (All (UninterpretField sch) choiceTypes) =>
+  UninterpretField sch (NS Identity (choiceTypes :: [Type]))
+  where
+  type Uninterpret (NS Identity choiceTypes) = 'TUnion (UninterpretList choiceTypes)
+  toFieldValue = FUnion . nsToFieldValues
+
+nsToFieldValues ::
+  forall sch choiceTypes.
+  (All (UninterpretField sch) choiceTypes) =>
+  NS Identity choiceTypes ->
+  NS (FieldValue sch) (UninterpretList choiceTypes)
+nsToFieldValues = \case
+  (Z val) -> Z . toFieldValue . runIdentity $ val
+  (S val) -> S (nsToFieldValues val)
+
+type family UninterpretList (as :: [Type]) :: [FieldType typeName] where
+  UninterpretList '[] = '[]
+  UninterpretList (t ': ts) = Uninterpret t ': UninterpretList ts