diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# haskell-bee-stm
+
+STM broker implementation for [haskell-bee](https://github.com/garganscript/haskell-bee).
diff --git a/haskell-bee-stm.cabal b/haskell-bee-stm.cabal
new file mode 100644
--- /dev/null
+++ b/haskell-bee-stm.cabal
@@ -0,0 +1,183 @@
+cabal-version:      3.4
+-- The cabal-version field refers to the version of the .cabal specification,
+-- and can be different from the cabal-install (the tool) version and the
+-- Cabal (the library) version you are using. As such, the Cabal (the library)
+-- version used must be equal or greater than the version stated in this field.
+-- Starting from the specification version 2.2, the cabal-version field must be
+-- the first thing in the cabal file.
+
+-- Initial package description 'haskell-pgmq' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               haskell-bee-stm
+
+-- The package version.
+-- See the Haskell package versioning policy (PVP) for standards
+-- guiding when and how versions should be incremented.
+-- https://pvp.haskell.org
+-- PVP summary:     +-+------- breaking API changes
+--                  | | +----- non-breaking API additions
+--                  | | | +--- code changes with no API change
+version:            0.1.0.0
+
+-- A short (one-line) description of the package.
+synopsis: STM broker implementation for haskell-bee
+   
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+extra-doc-files:    README.md
+
+-- A longer description of the package.
+description:        
+    Please see the README on GitHub at <https://github.com/garganscript/haskell-bee/blob/master/haskell-bee/README.md>
+
+-- URL for the project homepage or repository.
+homepage:           https://gitlab.iscpif.fr/gargantext/haskell-bee
+
+-- The license under which the package is released.
+license:            AGPL-3.0-or-later
+
+-- The file containing the license text.
+license-file:       LICENSE
+
+-- The package author(s).
+author:             Gargantext
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         gargantext@iscpif.fr
+
+-- A copyright notice.
+-- copyright:
+category:           Concurrency
+build-type:         Simple
+
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+-- extra-doc-files:    CHANGELOG.md
+--                   , README.md
+
+-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
+-- extra-source-files:
+
+common warnings
+    ghc-options: -Wall
+
+library
+    -- Import common warning flags.
+    import:           warnings
+
+    -- Modules exported by the library.
+    exposed-modules:  Async.Worker.Broker.STM
+
+    -- Modules included in this library but not exported.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:    base >=4.17.2.0 && < 5
+                    , aeson >= 2.1 && < 2.3
+                    , bytestring >= 0.11 && < 0.13
+                    , containers >= 0.6.7 && < 0.8
+                    , deepseq >= 1.0.0.0 && < 1.7
+                    , safe >= 0.3 && < 0.4
+                    , safe-exceptions >= 0.1.7 && < 0.2
+                    , scientific >= 0.3.7.0 && < 0.4
+                    , stm >= 2.5.3 && < 3
+                    , text >= 1.2 && < 2.2
+                    , time >= 1.10 && < 1.15
+                    , units >= 2.4 && < 2.5
+                    , unix-time >= 0.4.11 && < 0.5
+
+                    , haskell-bee ^>= 0.1.0.0
+
+    -- Directories containing source files.
+    hs-source-dirs:   src
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010
+
+    default-extensions:
+      DuplicateRecordFields
+      GeneralizedNewtypeDeriving
+      ImportQualifiedPost
+      NamedFieldPuns
+      NumericUnderscores
+      OverloadedStrings
+      RecordWildCards
+
+
+test-suite stm-test-unit
+    -- Import common warning flags.
+    import:           warnings
+    
+    type:             exitcode-stdio-1.0
+    
+    build-depends:    base >=4.17.2.0 && < 5
+                    , aeson >= 2.1 && < 2.3
+                    , tasty >= 1.5 && < 1.6
+                    , tasty-hunit >= 0.10 && < 0.11
+                    , tasty-quickcheck >= 0.10 && < 0.12
+                    , unix-time >= 0.4.11 && < 0.5
+                    
+                    , haskell-bee ^>= 0.1.0.0
+                    , haskell-bee-stm
+
+    -- Directories containing source files.
+    hs-source-dirs:   tests
+    main-is: unit-tests.hs
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010
+
+    default-extensions:
+      DuplicateRecordFields
+      GeneralizedNewtypeDeriving
+      ImportQualifiedPost
+      NamedFieldPuns
+      OverloadedStrings
+      RecordWildCards
+
+    ghc-options: -threaded
+
+      
+test-suite stm-test-integration
+    -- Import common warning flags.
+    import:           warnings
+    
+    type:             exitcode-stdio-1.0
+
+    other-modules:  Test.Integration.STM
+        
+    build-depends:    base >=4.17.2.0 && < 5
+                    , aeson >= 2.1 && < 2.3
+                    , containers >= 0.6 && < 0.8
+                    , hspec >= 2.11 && < 3
+                    , random-strings == 0.1.1.0
+                    , stm >= 2.5.3 && < 3
+                    , tasty >= 1.5 && < 1.6
+                    , tasty-hspec >= 1.2.0 && < 2
+                    , text >= 1.2 && < 2.2
+                    
+                    , haskell-bee ^>= 0.1.0.0
+                    , haskell-bee-tests ^>= 0.1.0.0
+                    , haskell-bee-stm
+
+    -- Directories containing source files.
+    hs-source-dirs:   tests
+    main-is: integration-tests.hs
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010
+
+    default-extensions:
+      DeriveGeneric
+      DuplicateRecordFields
+      GeneralizedNewtypeDeriving
+      ImportQualifiedPost
+      NamedFieldPuns
+      OverloadedStrings
+      RecordWildCards
+
+    ghc-options: -threaded
diff --git a/src/Async/Worker/Broker/STM.hs b/src/Async/Worker/Broker/STM.hs
new file mode 100644
--- /dev/null
+++ b/src/Async/Worker/Broker/STM.hs
@@ -0,0 +1,219 @@
+{-|
+Module      : Async.Worker.Broker.STM
+Description : Simple, STM-based broker, mostly used for tests
+Copyright   : (c) Gargantext, 2024-Present
+License     : AGPL
+Maintainer  : gargantext@iscpif.fr
+Stability   : experimental
+Portability : POSIX
+
+-}
+
+
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeFamilies #-}
+    
+module Async.Worker.Broker.STM
+  ( STMBroker
+  , BrokerInitParams(..)
+  , STMWithMsgId(..) )
+where
+
+import Async.Worker.Broker.Types (MessageBroker(..), Queue, TimeoutS(..))
+import Control.Concurrent (threadDelay)
+import Control.Monad.STM (atomically)
+import Control.Concurrent.STM.TVar
+import Data.Aeson (FromJSON(..), ToJSON(..), (.:), (.=), withObject, object, withScientific)
+import Data.Map.Strict qualified as Map
+import Data.Maybe (fromMaybe)
+import Data.Scientific (floatingOrInteger)
+import Data.UnixTime
+import Safe (headMay)
+
+
+data STMBroker
+
+instance (Show a) => MessageBroker STMBroker a where
+  data Broker STMBroker a =
+    STMBroker' {
+        stmMap :: TVar (Map.Map Queue (Map.Map Int (STMWithMsgId a)))
+      , archiveMap :: TVar (Map.Map Queue (Map.Map Int (STMWithMsgId a)))
+      , counter :: TVar Int  -- used to issue new ids
+      }
+  data BrokerMessage STMBroker a =
+    STMBM (STMWithMsgId a)
+    deriving (Show)
+  data Message STMBroker a = STMM a
+  data MessageId STMBroker = STMMid Int
+    deriving (Eq, Show, Ord)
+  data BrokerInitParams STMBroker a =
+    STMBrokerInitParams { archiveMap :: TVar (Map.Map Queue (Map.Map Int (STMWithMsgId a)))
+                        , stmMap :: TVar (Map.Map Queue (Map.Map Int (STMWithMsgId a))) }
+
+  messageId (STMBM (STMWithMsgId { stmidId })) = STMMid stmidId
+  getMessage (STMBM (STMWithMsgId { stmida })) = STMM stmida
+  toMessage message = STMM message
+  toA (STMM message) = message
+  initBroker (STMBrokerInitParams { .. }) = do
+    counter <- newTVarIO 0
+    pure $ STMBroker' { counter, .. }
+  deinitBroker (STMBroker' { }) = pure ()
+  
+  createQueue (STMBroker' { stmMap }) queue = do
+    atomically $ modifyTVar stmMap (Map.alter f queue)
+    where
+      f Nothing   = Just Map.empty
+      f (Just qs) = Just qs
+
+  dropQueue (STMBroker' { stmMap }) queue = do
+    atomically $ modifyTVar stmMap (Map.alter (const Nothing) queue)
+    
+
+  readMessageWaiting = popMessageWaiting
+  
+  popMessageWaiting (STMBroker' { stmMap }) queue = loop
+    where
+      loop = do
+        ut <- getUnixTime
+        mMsg <- atomically $ do
+          map' <- readTVar stmMap
+          case Map.lookup queue map' of
+            Nothing -> pure Nothing
+            Just qm -> do
+              let qm' = Map.filter (\s -> stmidInvisibleUntil s <= ut) qm
+              case snd <$> (headMay $ Map.toList qm') of
+                Nothing -> pure Nothing
+                Just msg' -> do
+                  -- modifyTVar stmMap $ Map.insert queue (Map.insert (stmidId msg') (msg' { stmidIsAvailable = False}) qm)
+                  pure $ Just msg'
+        case mMsg of
+          Just msg -> pure $ STMBM msg
+          Nothing -> do
+            threadDelay 10_000
+            loop
+
+  setMessageTimeout (STMBroker' { stmMap }) queue (STMMid msgId) timeoutS = do
+    atomically $ do
+      let dt = secondsToUnixDiffTime $ _TimeoutS timeoutS
+      let f s = Just $ s { stmidInvisibleUntil = addUnixDiffTime (stmidInvisibleUntil s) dt }
+      modifyTVar stmMap $ Map.update (\qm -> Just $ Map.update f msgId qm) queue
+    
+  -- setMessageTimeout (STMBroker' { stmMap }) queue msgId timeoutS = do
+  --   ut <- getUnixTime
+  --   atomically $ do
+  --     map' <- readTVar stmMap
+  --     case Map.lookup queue map' of
+  --       Nothing -> undefined
+  --       Just qs -> do
+  --         case filter (\(STMWithMsgId { stmidId }) -> stmidId == msgId) qs of
+  --           Nothing -> undefined
+  --           Just q -> do
+
+  sendMessage b queue message = sendMessageDelayed b queue message (TimeoutS 0)
+
+  sendMessageDelayed (STMBroker' { stmMap, counter }) queue (STMM message) (TimeoutS t) = do
+    id' <- atomically $ do
+      modifyTVar counter (+1)
+      readTVar counter
+    let msgId = STMMid id'
+    ut' <- getUnixTime
+    let ut = ut' { utSeconds = utSeconds ut' + fromIntegral t }
+    let m = STMWithMsgId { stmidId = id', stmida = message, stmidInvisibleUntil = ut }
+    let f x = case x of
+          Nothing -> Just $ Map.singleton id' m
+          Just qm -> Just $ Map.insert id' m qm
+    atomically $ do
+      modifyTVar stmMap (Map.alter f queue)
+      
+    return msgId
+
+  deleteMessage (STMBroker' { stmMap }) queue (STMMid msgId) = do
+    atomically $ do
+      modifyTVar stmMap $ Map.adjust (Map.delete msgId) queue
+          -- modifyTVar stmMap $ Map.insert queue (filter (\(STMWithMsgId { stmidId }) -> msgId /= stmidId) qs)
+
+  archiveMessage (STMBroker' { archiveMap, stmMap }) queue (STMMid msgId) = do
+    atomically $ do
+      map' <- readTVar stmMap
+      case Map.lookup queue map' of
+        Nothing -> pure ()
+        Just qm -> do
+          let el' = Map.lookup msgId qm
+          -- let el' = headMay $ filter (\(STMWithMsgId { stmidId }) -> msgId == stmidId) qs
+          modifyTVar stmMap $ Map.adjust (Map.delete msgId) queue
+          -- modifyTVar stmMap $ Map.insert queue (filter (\(STMWithMsgId { stmidId }) -> msgId /= stmidId) qs)
+          let f = case el' of
+                Nothing -> id
+                Just el'' -> \am -> Just (Map.insert msgId el'' $ fromMaybe Map.empty am)
+          modifyTVar archiveMap $ Map.alter f queue
+
+  getQueueSize broker queue = do
+    length <$> filterAvailableMessages broker queue
+
+  getArchivedMessage (STMBroker' { archiveMap }) queue (STMMid msgId) = do
+    -- m' <- readTVarIO archiveMap
+    -- putStrLn $ "[getArchivedMessage] m': " <> show m'
+    atomically $ do
+      map' <- readTVar archiveMap
+      case Map.lookup queue map' of
+        Nothing -> pure Nothing
+        Just qm ->
+          pure $ STMBM <$> (Map.lookup msgId qm)
+
+  listPendingMessageIds broker queue = do
+    msgIds <- Map.keys <$> filterAvailableMessages broker queue
+    pure $ STMMid <$> msgIds
+
+  getMessageById (STMBroker' { stmMap }) queue (STMMid msgId) = do
+    atomically $ do
+      map' <- readTVar stmMap
+      case Map.lookup queue map' of
+        Nothing -> pure Nothing
+        Just qm ->
+          pure $ STMBM <$> (Map.lookup msgId qm)
+
+
+filterAvailableMessages :: Broker STMBroker a -> Queue -> IO (Map.Map Int (STMWithMsgId a))
+filterAvailableMessages (STMBroker' { stmMap }) queue = do
+    um <- getUnixTime
+    atomically $ do
+      map' <- readTVar stmMap
+      pure $ Map.filter (\s -> stmidInvisibleUntil s <= um) $ fromMaybe Map.empty $ Map.lookup queue map'
+      
+-- | Helper datatype to store message with a unique id.
+-- We fetch the id by using 'INCR'
+-- https://redis.io/docs/latest/commands/incr/
+data STMWithMsgId a =
+  STMWithMsgId { stmida  :: a
+               , stmidInvisibleUntil :: UnixTime
+               , stmidId :: Int }
+  deriving (Show, Eq)
+instance FromJSON a => FromJSON (STMWithMsgId a) where
+  parseJSON = withObject "STMWithMsgId" $ \o -> do
+    stmida <- o .: "stmida"
+    -- timeout handling
+    stmidInvisibleUntilSec <- o .: "stmidInvisibleUntilSec"
+    stmidInvisibleUntilMs <- o .: "stmidInvisibleUntilMs"
+    let stmidInvisibleUntil = UnixTime { utSeconds = stmidInvisibleUntilSec
+                                       , utMicroSeconds = stmidInvisibleUntilMs }
+    stmidId <- o .: "stmidId"
+    return $ STMWithMsgId { stmida, stmidInvisibleUntil, stmidId }
+instance ToJSON a => ToJSON (STMWithMsgId a) where
+  toJSON (STMWithMsgId { .. }) = toJSON $ object [
+      "stmida" .= stmida
+    , "stmidInvisibleUntilSec" .= utSeconds stmidInvisibleUntil
+    , "stmidInvisibleUntilMs" .= utMicroSeconds stmidInvisibleUntil
+    , "stmidId" .= stmidId
+    ]
+
+
+
+instance ToJSON (MessageId STMBroker) where
+  toJSON (STMMid i) = toJSON i
+instance FromJSON (MessageId STMBroker) where
+  parseJSON = withScientific "STMMid" $ \n ->
+    case floatingOrInteger n of
+      Right i -> pure $ STMMid i
+      Left (f :: Double) -> fail $ "Integer expected: " <> show f
diff --git a/tests/Test/Integration/STM.hs b/tests/Test/Integration/STM.hs
new file mode 100644
--- /dev/null
+++ b/tests/Test/Integration/STM.hs
@@ -0,0 +1,26 @@
+module Test.Integration.STM
+ ( stmBrokerInitParams
+ , stmWorkerBrokerInitParams )
+where
+
+import Async.Worker.Broker.STM qualified as STMB
+import Async.Worker.Broker.Types qualified as BT
+import Async.Worker.Types (Job(..))
+import Control.Concurrent.STM.TVar (newTVarIO)
+import Data.Map.Strict qualified as Map
+import Test.Integration.Broker qualified as TIB
+import Test.Integration.Worker qualified as TIW
+
+
+stmBrokerInitParams :: IO (BT.BrokerInitParams STMB.STMBroker TIB.Message)
+stmBrokerInitParams = do
+  archiveMap <- newTVarIO Map.empty
+  stmMap <- newTVarIO Map.empty
+  pure $ STMB.STMBrokerInitParams { .. }
+
+
+stmWorkerBrokerInitParams :: IO (BT.BrokerInitParams STMB.STMBroker (Job TIW.Message))
+stmWorkerBrokerInitParams = do
+  archiveMap <- newTVarIO Map.empty
+  stmMap <- newTVarIO Map.empty
+  pure $  STMB.STMBrokerInitParams { .. }
diff --git a/tests/integration-tests.hs b/tests/integration-tests.hs
new file mode 100644
--- /dev/null
+++ b/tests/integration-tests.hs
@@ -0,0 +1,25 @@
+module Main where
+
+import Test.Integration.Broker (brokerTests)
+import Test.Integration.STM (stmBrokerInitParams, stmWorkerBrokerInitParams)
+import Test.Integration.Worker (workerTests, multiWorkerTests)
+import Test.Tasty
+import Test.Tasty.Hspec
+
+
+
+main :: IO ()
+main = do
+  stmBInitParams <- stmBrokerInitParams
+  stmBrokerSpec <- testSpec "brokerTests" (brokerTests stmBInitParams)
+  stmWBInitParams <- stmWorkerBrokerInitParams
+  stmWorkerSpec <- testSpec "workerTests" (workerTests stmWBInitParams)
+  stmMultiWorkerSpec <- testSpec "multiWorkerTests" (multiWorkerTests stmWBInitParams 5)
+
+  defaultMain $ testGroup "STM integration tests"
+    [
+      stmBrokerSpec
+    , stmWorkerSpec
+    , stmMultiWorkerSpec
+   ]
+
diff --git a/tests/unit-tests.hs b/tests/unit-tests.hs
new file mode 100644
--- /dev/null
+++ b/tests/unit-tests.hs
@@ -0,0 +1,38 @@
+{-# OPTIONS_GHC -Wno-orphans -Wno-missing-signatures #-}
+
+module Main where
+
+import Async.Worker.Broker.STM qualified as STMB
+import Data.Aeson qualified as Aeson
+import Data.UnixTime
+import Test.Tasty
+import Test.Tasty.QuickCheck as QC
+    
+
+main = defaultMain tests
+
+tests :: TestTree
+tests = testGroup "Tests" [propertyTests]
+
+
+
+propertyTests = testGroup "Property tests" [aesonPropTests]
+    
+aesonPropTests = testGroup "Aeson (de-)serialization property tests" $
+ [ aesonPropSTMBTests ]
+
+
+instance QC.Arbitrary a => QC.Arbitrary (STMB.STMWithMsgId a) where
+  arbitrary = do
+    stmidId <- arbitrary
+    stmida <- arbitrary
+    utSeconds <- arbitrary
+    utMicroSeconds <- arbitrary
+    let stmidInvisibleUntil = UnixTime { utSeconds, utMicroSeconds }
+    return $ STMB.STMWithMsgId { stmida, stmidId, stmidInvisibleUntil }
+
+aesonPropSTMBTests = testGroup "Aeson STMWithMsgId (de-)serialization tests" $
+  [ QC.testProperty "Aeson.decode . Aeson.encode == id" $
+     \j ->
+       Aeson.decode (Aeson.encode (j :: STMB.STMWithMsgId String)) == Just j
+  ]