diff --git a/.gitignore b/.gitignore
index 943ad64e1a..04193fca0a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,6 +48,8 @@ parm/gdas/io
 parm/gdas/ioda
 parm/gdas/snow
 parm/gdas/soca
+parm/gdas/jcb-gdas
+parm/gdas/jcb-algorithms
 parm/monitor
 parm/post/AEROSOL_LUTS.dat
 parm/post/nam_micro_lookup.dat
@@ -195,3 +197,8 @@ versions/run.ver
 ush/python/wxflow
 workflow/wxflow
 ci/scripts/wxflow
+
+# jcb checkout and symlinks
+ush/python/jcb
+workflow/jcb
+ci/scripts/jcb
diff --git a/.gitmodules b/.gitmodules
index 4851e232ee..ea1b5c06af 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -30,3 +30,7 @@
   path = sorc/upp.fd
   url = https://github.com/NOAA-EMC/UPP.git
   ignore = dirty
+[submodule "sorc/jcb"]
+  path = sorc/jcb
+  url = https://github.com/noaa-emc/jcb
+  fetchRecurseSubmodules = false
diff --git a/parm/config/gfs/config.atmanl b/parm/config/gfs/config.atmanl
index 5eb692b473..dd8ca80b11 100644
--- a/parm/config/gfs/config.atmanl
+++ b/parm/config/gfs/config.atmanl
@@ -5,18 +5,20 @@
 
 echo "BEGIN: config.atmanl"
 
-export OBS_LIST="${PARMgfs}/gdas/atm/obs/lists/gdas_prototype_3d.yaml.j2"
-export JEDIYAML="${PARMgfs}/gdas/atm/variational/3dvar_drpcg.yaml.j2"
+export JCB_BASE_YAML="${PARMgfs}/gdas/atm/jcb-base.yaml.j2"
+export JCB_ALGO_YAML="${PARMgfs}/gdas/atm/jcb-prototype_3dvar.yaml.j2"
+
 export STATICB_TYPE="gsibec"
+export LOCALIZATION_TYPE="bump"
 export INTERP_METHOD='barycentric'
 
 if [[ ${DOHYBVAR} = "YES" ]]; then
     # shellcheck disable=SC2153
     export CASE_ANL=${CASE_ENS}
-    export BERROR_YAML="${PARMgfs}/gdas/atm/berror/hybvar_${STATICB_TYPE}.yaml.j2"
+    export BERROR_YAML="background_error_hybrid_${STATICB_TYPE}_${LOCALIZATION_TYPE}"
 else
     export CASE_ANL=${CASE}
-    export BERROR_YAML="${PARMgfs}/gdas/atm/berror/staticb_${STATICB_TYPE}.yaml.j2"
+    export BERROR_YAML="background_error_static_${STATICB_TYPE}"
 fi
 
 export CRTM_FIX_YAML="${PARMgfs}/gdas/atm_crtm_coeff.yaml.j2"
diff --git a/parm/config/gfs/config.atmanlfv3inc b/parm/config/gfs/config.atmanlfv3inc
index 14c11d3dd3..ab7efa3a60 100644
--- a/parm/config/gfs/config.atmanlfv3inc
+++ b/parm/config/gfs/config.atmanlfv3inc
@@ -8,7 +8,7 @@ echo "BEGIN: config.atmanlfv3inc"
 # Get task specific resources
 . "${EXPDIR}/config.resources" atmanlfv3inc
 
-export JEDIYAML=${PARMgfs}/gdas/atm/utils/fv3jedi_fv3inc_variational.yaml.j2
+export JCB_ALGO=fv3jedi_fv3inc_variational
 export JEDIEXE=${EXECgfs}/fv3jedi_fv3inc.x
 
 echo "END: config.atmanlfv3inc"
diff --git a/parm/config/gfs/config.atmensanl b/parm/config/gfs/config.atmensanl
index 23eab7f7b9..3484cb670d 100644
--- a/parm/config/gfs/config.atmensanl
+++ b/parm/config/gfs/config.atmensanl
@@ -5,8 +5,9 @@
 
 echo "BEGIN: config.atmensanl"
 
-export OBS_LIST="${PARMgfs}/gdas/atm/obs/lists/lgetkf_prototype.yaml.j2"
-export JEDIYAML="${PARMgfs}/gdas/atm/lgetkf/lgetkf.yaml.j2"
+export JCB_BASE_YAML="${PARMgfs}/gdas/atm/jcb-base.yaml.j2"
+export JCB_ALGO_YAML="${PARMgfs}/gdas/atm/jcb-prototype_lgetkf.yaml.j2"
+
 export INTERP_METHOD='barycentric'
 
 export CRTM_FIX_YAML="${PARMgfs}/gdas/atm_crtm_coeff.yaml.j2"
diff --git a/sorc/gdas.cd b/sorc/gdas.cd
index 70f1319139..2b2d417a96 160000
--- a/sorc/gdas.cd
+++ b/sorc/gdas.cd
@@ -1 +1 @@
-Subproject commit 70f13191391d0909e92da47dc7d17ddf1dc4c6c6
+Subproject commit 2b2d417a96528527d7d3e7eedaccf150dc075d92
diff --git a/sorc/jcb b/sorc/jcb
new file mode 160000
index 0000000000..de75655d81
--- /dev/null
+++ b/sorc/jcb
@@ -0,0 +1 @@
+Subproject commit de75655d81ec2ee668d8d47bf4a43625c81dde7c
diff --git a/sorc/link_workflow.sh b/sorc/link_workflow.sh
index 0041ce083b..c5d7243e8f 100755
--- a/sorc/link_workflow.sh
+++ b/sorc/link_workflow.sh
@@ -88,11 +88,17 @@ if [[ "${LINK_NEST:-OFF}" == "ON" ]] ; then
   source "${HOMEgfs}/versions/fix.nest.ver"
 fi
 
-# Link wxflow in ush/python, workflow and ci/scripts
+# Link python pacakges in ush/python
+# TODO: This will be unnecessary when these are part of the virtualenv
+packages=("wxflow" "jcb")
+for package in "${packages[@]}"; do
+    cd "${HOMEgfs}/ush/python" || exit 1
+    [[ -s "${package}" ]] && rm -f "${package}"
+    ${LINK} "${HOMEgfs}/sorc/${package}/src/${package}" .
+done
+
+# Link wxflow in workflow and ci/scripts
 # TODO: This will be unnecessary when wxflow is part of the virtualenv
-cd "${HOMEgfs}/ush/python" || exit 1
-[[ -s "wxflow" ]] && rm -f wxflow
-${LINK} "${HOMEgfs}/sorc/wxflow/src/wxflow" .
 cd "${HOMEgfs}/workflow" || exit 1
 [[ -s "wxflow" ]] && rm -f wxflow
 ${LINK} "${HOMEgfs}/sorc/wxflow/src/wxflow" .
@@ -100,7 +106,6 @@ cd "${HOMEgfs}/ci/scripts" || exit 1
 [[ -s "wxflow" ]] && rm -f wxflow
 ${LINK} "${HOMEgfs}/sorc/wxflow/src/wxflow" .
 
-
 # Link fix directories
 if [[ -n "${FIX_DIR}" ]]; then
   if [[ ! -d "${HOMEgfs}/fix" ]]; then mkdir "${HOMEgfs}/fix" || exit 1; fi
@@ -228,7 +233,7 @@ fi
 #------------------------------
 if [[ -d "${HOMEgfs}/sorc/gdas.cd" ]]; then
   cd "${HOMEgfs}/parm/gdas" || exit 1
-  declare -a gdasapp_comps=("aero" "atm" "io" "ioda" "snow" "soca")
+  declare -a gdasapp_comps=("aero" "atm" "io" "ioda" "snow" "soca" "jcb-gdas" "jcb-algorithms")
   for comp in "${gdasapp_comps[@]}"; do
     [[ -d "${comp}" ]] && rm -rf "${comp}"
     ${LINK_OR_COPY} "${HOMEgfs}/sorc/gdas.cd/parm/${comp}" .
diff --git a/ush/python/pygfs/task/analysis.py b/ush/python/pygfs/task/analysis.py
index 5a516a02c8..5464c25370 100644
--- a/ush/python/pygfs/task/analysis.py
+++ b/ush/python/pygfs/task/analysis.py
@@ -6,8 +6,9 @@
 from logging import getLogger
 from pprint import pformat
 from netCDF4 import Dataset
-from typing import List, Dict, Any, Union
+from typing import List, Dict, Any, Union, Optional
 
+from jcb import render
 from wxflow import (parse_j2yaml, FileHandler, rm_p, logit,
                     Task, Executable, WorkflowException, to_fv3time, to_YMD,
                     Template, TemplateConstants)
@@ -46,11 +47,14 @@ def initialize(self) -> None:
         self.link_jediexe()
 
     @logit(logger)
-    def get_jedi_config(self) -> Dict[str, Any]:
+    def get_jedi_config(self, algorithm: Optional[str] = None) -> Dict[str, Any]:
         """Compile a dictionary of JEDI configuration from JEDIYAML template file
 
         Parameters
         ----------
+        algorithm (optional) : str
+            Name of the algorithm to use in the JEDI configuration. Will override the algorithm
+            set in the self.config.JCB_<>_YAML file
 
         Returns
         ----------
@@ -60,7 +64,31 @@ def get_jedi_config(self) -> Dict[str, Any]:
 
         # generate JEDI YAML file
         logger.info(f"Generate JEDI YAML config: {self.task_config.jedi_yaml}")
-        jedi_config = parse_j2yaml(self.task_config.JEDIYAML, self.task_config, searchpath=self.gdasapp_j2tmpl_dir)
+
+        if 'JCB_BASE_YAML' in self.task_config.keys():
+            # Step 1: fill templates of the jcb base YAML file
+            jcb_config = parse_j2yaml(self.task_config.JCB_BASE_YAML, self.task_config)
+
+            # Step 2: (optional) fill templates of algorithm override YAML and merge
+            if 'JCB_ALGO_YAML' in self.task_config.keys():
+                jcb_algo_config = parse_j2yaml(self.task_config.JCB_ALGO_YAML, self.task_config)
+                jcb_config = {**jcb_config, **jcb_algo_config}
+
+            # If algorithm is present override the algorithm in the JEDI config
+            if algorithm:
+                jcb_config['algorithm'] = algorithm
+
+            # Step 3: generate the JEDI Yaml using JCB driving YAML
+            jedi_config = render(jcb_config)
+        elif 'JEDIYAML' in self.task_config.keys():
+            # Generate JEDI YAML file (without using JCB)
+            logger.info(f"Generate JEDI YAML config: {self.task_config.jedi_yaml}")
+            jedi_config = parse_j2yaml(self.task_config.JEDIYAML, self.task_config,
+                                       searchpath=self.gdasapp_j2tmpl_dir)
+            logger.debug(f"JEDI config:\n{pformat(jedi_config)}")
+        else:
+            raise KeyError(f"Task config must contain JCB_BASE_YAML or JEDIYAML")
+
         logger.debug(f"JEDI config:\n{pformat(jedi_config)}")
 
         return jedi_config
@@ -82,7 +110,7 @@ def get_obs_dict(self) -> Dict[str, Any]:
             a dictionary containing the list of observation files to copy for FileHandler
         """
 
-        logger.info(f"Extracting a list of observation files from {self.task_config.JEDIYAML}")
+        logger.info(f"Extracting a list of observation files from Jedi config file")
         observations = find_value_in_nested_dict(self.task_config.jedi_config, 'observations')
         logger.debug(f"observations:\n{pformat(observations)}")
 
@@ -116,7 +144,7 @@ def get_bias_dict(self) -> Dict[str, Any]:
             a dictionary containing the list of observation bias files to copy for FileHandler
         """
 
-        logger.info(f"Extracting a list of bias correction files from {self.task_config.JEDIYAML}")
+        logger.info(f"Extracting a list of bias correction files from Jedi config file")
         observations = find_value_in_nested_dict(self.task_config.jedi_config, 'observations')
         logger.debug(f"observations:\n{pformat(observations)}")
 
diff --git a/ush/python/pygfs/task/atm_analysis.py b/ush/python/pygfs/task/atm_analysis.py
index 47d291268e..95545c57a4 100644
--- a/ush/python/pygfs/task/atm_analysis.py
+++ b/ush/python/pygfs/task/atm_analysis.py
@@ -49,6 +49,9 @@ def __init__(self, config):
                 'APREFIX': f"{self.runtime_config.CDUMP}.t{self.runtime_config.cyc:02d}z.",  # TODO: CDUMP is being replaced by RUN
                 'GPREFIX': f"gdas.t{self.runtime_config.previous_cycle.hour:02d}z.",
                 'jedi_yaml': _jedi_yaml,
+                'atm_obsdatain_path': f"{self.runtime_config.DATA}/obs/",
+                'atm_obsdataout_path': f"{self.runtime_config.DATA}/diags/",
+                'BKG_TSTEP': "PT1H"  # Placeholder for 4D applications
             }
         )
 
@@ -137,8 +140,9 @@ def variational(self: Analysis) -> None:
     @logit(logger)
     def init_fv3_increment(self: Analysis) -> None:
         # Setup JEDI YAML file
-        self.task_config.jedi_yaml = os.path.join(self.runtime_config.DATA, os.path.basename(self.task_config.JEDIYAML))
-        save_as_yaml(self.get_jedi_config(), self.task_config.jedi_yaml)
+        self.task_config.jedi_yaml = os.path.join(self.runtime_config.DATA,
+                                                  f"{self.task_config.JCB_ALGO}.yaml")
+        save_as_yaml(self.get_jedi_config(self.task_config.JCB_ALGO), self.task_config.jedi_yaml)
 
         # Link JEDI executable to run directory
         self.task_config.jedi_exe = self.link_jediexe()
diff --git a/ush/python/pygfs/task/atmens_analysis.py b/ush/python/pygfs/task/atmens_analysis.py
index a1aecfe07c..5aaacc42e8 100644
--- a/ush/python/pygfs/task/atmens_analysis.py
+++ b/ush/python/pygfs/task/atmens_analysis.py
@@ -46,6 +46,9 @@ def __init__(self, config):
                 'APREFIX': f"{self.runtime_config.CDUMP}.t{self.runtime_config.cyc:02d}z.",  # TODO: CDUMP is being replaced by RUN
                 'GPREFIX': f"gdas.t{self.runtime_config.previous_cycle.hour:02d}z.",
                 'jedi_yaml': _jedi_yaml,
+                'atm_obsdatain_path': f"./obs/",
+                'atm_obsdataout_path': f"./diags/",
+                'BKG_TSTEP': "PT1H"  # Placeholder for 4D applications
             }
         )