diff --git a/atst/domain/applications.py b/atst/domain/applications.py
index ba81461d..640242c0 100644
--- a/atst/domain/applications.py
+++ b/atst/domain/applications.py
@@ -2,8 +2,10 @@ from sqlalchemy.orm.exc import NoResultFound
 
 from atst.database import db
 from . import BaseDomainClass
+from atst.domain.application_roles import ApplicationRoles
 from atst.domain.environments import Environments
 from atst.domain.exceptions import NotFoundError
+from atst.domain.users import Users
 from atst.models.application import Application
 from atst.models.environment import Environment
 from atst.models.environment_role import EnvironmentRole
@@ -72,3 +74,30 @@ class Applications(BaseDomainClass):
 
         db.session.add(application)
         db.session.commit()
+
+    @classmethod
+    def create_member(
+        cls, application, user_data, permission_sets=None, environment_roles_data=None
+    ):
+        permission_sets = [] if permission_sets is None else permission_sets
+        environment_roles_data = (
+            [] if environment_roles_data is None else environment_roles_data
+        )
+
+        user = Users.get_or_create_by_dod_id(
+            user_data["dod_id"],
+            first_name=user_data["first_name"],
+            last_name=user_data["last_name"],
+            phone_number=user_data.get("phone_number"),
+            email=user_data["email"],
+        )
+
+        application_role = ApplicationRoles.create(user, application, permission_sets)
+
+        for env_role_data in environment_roles_data:
+            role = env_role_data.get("role")
+            if role:
+                environment = Environments.get(env_role_data.get("environment_id"))
+                Environments.add_member(environment, user, env_role_data.get("role"))
+
+        return application_role
diff --git a/atst/domain/invitations.py b/atst/domain/invitations.py
index cfedde11..209cd4d1 100644
--- a/atst/domain/invitations.py
+++ b/atst/domain/invitations.py
@@ -2,7 +2,7 @@ import datetime
 from sqlalchemy.orm.exc import NoResultFound
 
 from atst.database import db
-from atst.models import InvitationStatus, PortfolioInvitation
+from atst.models import ApplicationInvitation, InvitationStatus, PortfolioInvitation
 from atst.domain.portfolio_roles import PortfolioRoles
 
 from .exceptions import NotFoundError
@@ -127,3 +127,7 @@ class BaseInvitations(object):
 
 class PortfolioInvitations(BaseInvitations):
     model = PortfolioInvitation
+
+
+class ApplicationInvitations(BaseInvitations):
+    model = ApplicationInvitation
diff --git a/atst/forms/application_member.py b/atst/forms/application_member.py
new file mode 100644
index 00000000..03c85953
--- /dev/null
+++ b/atst/forms/application_member.py
@@ -0,0 +1,41 @@
+from wtforms.fields import FormField, FieldList, HiddenField, BooleanField
+
+from .forms import BaseForm
+from .member import NewForm as BaseNewMemberForm
+from .data import ENV_ROLES
+from atst.forms.fields import SelectField
+from atst.domain.permission_sets import PermissionSets
+
+
+class EnvironmentForm(BaseForm):
+    environment_id = HiddenField()
+    environment_name = HiddenField()
+    role = SelectField(environment_name, choices=ENV_ROLES, default=None)
+
+
+class PermissionsForm(BaseForm):
+    perms_env_mgmt = BooleanField(None, default=False)
+    perms_team_mgmt = BooleanField(None, default=False)
+    perms_del_env = BooleanField(None, default=False)
+
+    @property
+    def data(self):
+        _data = super().data
+        perm_sets = []
+
+        if _data["perms_env_mgmt"]:
+            perm_sets.append(PermissionSets.EDIT_APPLICATION_ENVIRONMENTS)
+
+        if _data["perms_team_mgmt"]:
+            perm_sets.append(PermissionSets.EDIT_APPLICATION_TEAM)
+
+        if _data["perms_del_env"]:
+            perm_sets.append(PermissionSets.DELETE_APPLICATION_ENVIRONMENTS)
+
+        return perm_sets
+
+
+class NewForm(BaseForm):
+    user_data = FormField(BaseNewMemberForm)
+    permission_sets = FormField(PermissionsForm)
+    environment_roles = FieldList(FormField(EnvironmentForm))
diff --git a/atst/forms/data.py b/atst/forms/data.py
index 23ab9c4a..515a70e9 100644
--- a/atst/forms/data.py
+++ b/atst/forms/data.py
@@ -1,3 +1,4 @@
+from atst.models import CSPRole
 from atst.utils.localization import translate, translate_duration
 from atst.models.environment_role import CSPRole
 
diff --git a/atst/models/__init__.py b/atst/models/__init__.py
index 7fe45e05..8a3cdbfa 100644
--- a/atst/models/__init__.py
+++ b/atst/models/__init__.py
@@ -7,7 +7,7 @@ from .permission_set import PermissionSet
 from .user import User
 from .portfolio_role import PortfolioRole, Status as PortfolioRoleStatus
 from .application_role import ApplicationRole, Status as ApplicationRoleStatus
-from .environment_role import EnvironmentRole
+from .environment_role import EnvironmentRole, CSPRole
 from .portfolio import Portfolio
 from .application import Application
 from .environment import Environment
diff --git a/atst/models/user.py b/atst/models/user.py
index 0510d867..d40501a4 100644
--- a/atst/models/user.py
+++ b/atst/models/user.py
@@ -5,6 +5,7 @@ from sqlalchemy.dialects.postgresql import UUID
 from atst.models import Base, types, mixins
 from atst.models.permissions import Permissions
 from atst.models.portfolio_invitation import PortfolioInvitation
+from atst.models.application_invitation import ApplicationInvitation
 
 
 users_permission_sets = Table(
@@ -39,6 +40,13 @@ class User(
         "PortfolioInvitation", foreign_keys=PortfolioInvitation.inviter_id
     )
 
+    application_invitations = relationship(
+        "ApplicationInvitation", foreign_keys=ApplicationInvitation.user_id
+    )
+    sent_application_invitations = relationship(
+        "ApplicationInvitation", foreign_keys=ApplicationInvitation.inviter_id
+    )
+
     email = Column(String)
     dod_id = Column(String, unique=True, nullable=False)
     first_name = Column(String)
diff --git a/atst/routes/applications/team.py b/atst/routes/applications/team.py
index c9e57296..7fb75f0e 100644
--- a/atst/routes/applications/team.py
+++ b/atst/routes/applications/team.py
@@ -1,12 +1,15 @@
-from flask import render_template
+from flask import render_template, request as http_request, g, url_for, redirect
 
 
 from . import applications_bp
 from atst.domain.environments import Environments
 from atst.domain.applications import Applications
 from atst.domain.authz.decorator import user_can_access_decorator as user_can
-from atst.models.permissions import Permissions
 from atst.domain.permission_sets import PermissionSets
+from atst.forms.application_member import NewForm as NewMemberForm
+from atst.models.permissions import Permissions
+from atst.services.invitation import Invitation as InvitationService
+from atst.utils.flash import formatted_flash as flash
 from atst.utils.localization import translate
 
 
@@ -47,3 +50,45 @@ def team(application_id):
         application=application,
         environment_users=environment_users,
     )
+
+
+@applications_bp.route("/application/<application_id>/members/new", methods=["POST"])
+@user_can(
+    Permissions.CREATE_APPLICATION_MEMBER, message="create new application member"
+)
+def create_member(application_id):
+    application = Applications.get(application_id)
+    form = NewMemberForm(http_request.form)
+
+    if form.validate():
+        try:
+            member = Applications.create_member(
+                application,
+                form.user_data.data,
+                permission_sets=form.permission_sets.data,
+                environment_roles_data=form.environment_roles.data,
+            )
+
+            invite_service = InvitationService(
+                g.current_user, member, form.user_data.data.get("email")
+            )
+            invite_service.invite()
+
+            flash("new_portfolio_member", new_member=member)
+
+        except AlreadyExistsError:
+            return render_template(
+                "error.html", message="There was an error processing your request."
+            )
+    else:
+        pass
+        # TODO: flash error message
+
+    return redirect(
+        url_for(
+            "applications.team",
+            application_id=application_id,
+            fragment="application-members",
+            _anchor="application-members",
+        )
+    )
diff --git a/atst/routes/portfolios/invitations.py b/atst/routes/portfolios/invitations.py
index a34fcee8..0e5901fe 100644
--- a/atst/routes/portfolios/invitations.py
+++ b/atst/routes/portfolios/invitations.py
@@ -9,7 +9,9 @@ from atst.models.permissions import Permissions
 
 
 def send_invite_email(owner_name, token, new_member_email):
-    body = render_template("emails/invitation.txt", owner=owner_name, token=token)
+    body = render_template(
+        "emails/portfolio/invitation.txt", owner=owner_name, token=token
+    )
     queue.send_mail(
         [new_member_email],
         "{} has invited you to a JEDI Cloud Portfolio".format(owner_name),
diff --git a/atst/services/invitation.py b/atst/services/invitation.py
index 9d478776..877a3ab7 100644
--- a/atst/services/invitation.py
+++ b/atst/services/invitation.py
@@ -1,25 +1,26 @@
 from flask import render_template
 
-from atst.domain.invitations import PortfolioInvitations
+from atst.domain.invitations import PortfolioInvitations, ApplicationInvitations
 from atst.queue import queue
 from atst.domain.task_orders import TaskOrders
 from atst.domain.portfolio_roles import PortfolioRoles
+from atst.models import ApplicationRole, PortfolioRole
 
 OFFICER_INVITATIONS = {
     "ko_invite": {
         "role": "contracting_officer",
         "subject": "Review a task order",
-        "template": "emails/invitation.txt",
+        "template": "emails/portfolio/invitation.txt",
     },
     "cor_invite": {
         "role": "contracting_officer_representative",
         "subject": "Help with a task order",
-        "template": "emails/invitation.txt",
+        "template": "emails/portfolio/invitation.txt",
     },
     "so_invite": {
         "role": "security_officer",
         "subject": "Review security for a task order",
-        "template": "emails/invitation.txt",
+        "template": "emails/portfolio/invitation.txt",
     },
 }
 
@@ -47,20 +48,38 @@ def update_officer_invitations(user, task_order):
 
 
 class Invitation:
-    def __init__(
-        self,
-        inviter,
-        member,
-        email,
-        subject="{} has invited you to a JEDI cloud portfolio",
-        email_template="emails/invitation.txt",
-    ):
+    def __init__(self, inviter, member, email, subject="", email_template=None):
         self.inviter = inviter
         self.member = member
         self.email = email
         self.subject = subject
         self.email_template = email_template
 
+        if isinstance(member, PortfolioRole):
+            self.email_template = (
+                "emails/portfolio/invitation.txt"
+                if self.email_template is None
+                else self.email_template
+            )
+            self.subject = (
+                "{} has invited you to a JEDI cloud portfolio"
+                if self.subject is None
+                else self.subject
+            )
+            self.domain_class = PortfolioInvitations
+        elif isinstance(member, ApplicationRole):
+            self.email_template = (
+                "emails/application/invitation.txt"
+                if self.email_template is None
+                else self.email_template
+            )
+            self.subject = (
+                "{} has invited you to a JEDI cloud application"
+                if self.subject is None
+                else self.subject
+            )
+            self.domain_class = ApplicationInvitations
+
     def invite(self):
         invite = self._create_invite()
         self._send_invite_email(invite.token)
@@ -68,7 +87,7 @@ class Invitation:
         return invite
 
     def _create_invite(self):
-        return PortfolioInvitations.create(self.inviter, self.member, self.email)
+        return self.domain_class.create(self.inviter, self.member, self.email)
 
     def _send_invite_email(self, token):
         body = render_template(
diff --git a/atst/utils/flash.py b/atst/utils/flash.py
index da021ecc..9fff1be2 100644
--- a/atst/utils/flash.py
+++ b/atst/utils/flash.py
@@ -161,6 +161,13 @@ MESSAGES = {
         """,
         "category": "success",
     },
+    "new_application_member": {
+        "title_template": translate("flash.success"),
+        "message_template": """
+          <p>{{ "flash.new_application_member" | translate({ "user_name": new_member.user_name }) }}</p>
+        """,
+        "category": "success",
+    },
 }
 
 
diff --git a/templates/emails/application/invitation.txt b/templates/emails/application/invitation.txt
new file mode 100644
index 00000000..1d49b452
--- /dev/null
+++ b/templates/emails/application/invitation.txt
@@ -0,0 +1,10 @@
+{% extends "emails/base.txt" %}
+
+{% block content %}
+
+Join this JEDI Cloud Application
+{{ owner }} has invited you to join a JEDI Cloud Application. Login now to view or use your JEDI Cloud resources.
+
+{# url_for("application.accept_invitation", token=token, _external=True) #}
+
+{% endblock %}
diff --git a/templates/emails/invitation.txt b/templates/emails/base.txt
similarity index 61%
rename from templates/emails/invitation.txt
rename to templates/emails/base.txt
index f63e4db2..8a098d8e 100644
--- a/templates/emails/invitation.txt
+++ b/templates/emails/base.txt
@@ -1,7 +1,4 @@
-Join this JEDI Cloud Portfolio
-{{ owner }} has invited you to join a JEDI Cloud Portfolio.  Login now to view or use your JEDI Cloud resources.
-
-{{ url_for("portfolios.accept_invitation", token=token, _external=True) }}
+{% block content %}{% endblock %}
 
 What is JEDI Cloud?
 JEDI Cloud is a DoD enterprise-wide solution for commercial cloud services.
diff --git a/templates/emails/portfolio/invitation.txt b/templates/emails/portfolio/invitation.txt
new file mode 100644
index 00000000..dd0f12df
--- /dev/null
+++ b/templates/emails/portfolio/invitation.txt
@@ -0,0 +1,10 @@
+{% extends "emails/base.txt" %}
+
+{% block content %}
+
+Join this JEDI Cloud Portfolio
+{{ owner }} has invited you to join a JEDI Cloud Portfolio.  Login now to view or use your JEDI Cloud resources.
+
+{{ url_for("portfolios.accept_invitation", token=token, _external=True) }}
+
+{% endblock %}
diff --git a/tests/domain/test_applications.py b/tests/domain/test_applications.py
index b10c15f3..922b813c 100644
--- a/tests/domain/test_applications.py
+++ b/tests/domain/test_applications.py
@@ -1,7 +1,9 @@
 import pytest
 from uuid import uuid4
 
+from atst.models import CSPRole
 from atst.domain.applications import Applications
+from atst.domain.permission_sets import PermissionSets
 from atst.domain.exceptions import NotFoundError
 
 from tests.factories import (
@@ -100,3 +102,29 @@ def test_delete_application(session):
 
     # changes are flushed
     assert not session.dirty
+
+
+def test_create_member():
+    application = ApplicationFactory.create()
+    env1 = EnvironmentFactory.create(application=application)
+    env2 = EnvironmentFactory.create(application=application)
+    user_data = UserFactory.dictionary()
+    permission_set_names = [PermissionSets.EDIT_APPLICATION_TEAM]
+
+    member_role = Applications.create_member(
+        application,
+        user_data,
+        permission_set_names,
+        environment_roles_data=[
+            {"environment_id": env1.id, "role": CSPRole.BASIC_ACCESS.value},
+            {"environment_id": env2.id, "role": None},
+        ],
+    )
+
+    assert member_role.user.dod_id == user_data["dod_id"]
+    # view application AND edit application team
+    assert len(member_role.permission_sets) == 2
+
+    env_roles = member_role.user.environment_roles
+    assert len(env_roles) == 1
+    assert env_roles[0].environment == env1
diff --git a/tests/routes/applications/test_team.py b/tests/routes/applications/test_team.py
index d5a8e764..1c3e0a17 100644
--- a/tests/routes/applications/test_team.py
+++ b/tests/routes/applications/test_team.py
@@ -1,6 +1,6 @@
 from flask import url_for
 
-from tests.factories import PortfolioFactory, ApplicationFactory
+from tests.factories import PortfolioFactory, ApplicationFactory, UserFactory
 
 
 def test_application_team(client, user_session):
@@ -12,3 +12,43 @@ def test_application_team(client, user_session):
     response = client.get(url_for("applications.team", application_id=application.id))
 
     assert response.status_code == 200
+
+
+def test_create_member(client, user_session):
+    user = UserFactory.create()
+    application = ApplicationFactory.create(
+        environments=[{"name": "Naboo"}, {"name": "Endor"}]
+    )
+    env = application.environments[0]
+
+    user_session(application.portfolio.owner)
+
+    response = client.post(
+        url_for("applications.create_member", application_id=application.id),
+        data={
+            "user_data-first_name": user.first_name,
+            "user_data-last_name": user.last_name,
+            "user_data-dod_id": user.dod_id,
+            "user_data-email": user.email,
+            "environment_roles-0-environment_id": env.id,
+            "environment_roles-0-environment_name": env.name,
+            "environment_roles-0-role": "Basic Access",
+            "permission_sets-perms_env_mgmt": True,
+            "permission_sets-perms_team_mgmt": True,
+            "permission_sets-perms_del_env": True,
+        },
+    )
+
+    assert response.status_code == 302
+    expected_url = url_for(
+        "applications.team",
+        application_id=application.id,
+        fragment="application-members",
+        _anchor="application-members",
+        _external=True,
+    )
+    assert response.location == expected_url
+    assert len(user.application_roles) == 1
+    assert user.application_roles[0].application == application
+    assert len(user.environment_roles) == 1
+    assert user.environment_roles[0].environment == env
diff --git a/tests/services/test_invitation.py b/tests/services/test_invitation.py
index 364cdbcc..afa4ddde 100644
--- a/tests/services/test_invitation.py
+++ b/tests/services/test_invitation.py
@@ -1,9 +1,15 @@
-from tests.factories import UserFactory, PortfolioFactory, PortfolioRoleFactory
+from tests.factories import (
+    ApplicationFactory,
+    ApplicationRoleFactory,
+    UserFactory,
+    PortfolioFactory,
+    PortfolioRoleFactory,
+)
 
 from atst.services.invitation import Invitation
 
 
-def test_invite_member(queue):
+def test_invite_portfolio_member(queue):
     inviter = UserFactory.create()
     new_member = UserFactory.create()
     portfolio = PortfolioFactory.create(owner=inviter)
@@ -12,3 +18,14 @@ def test_invite_member(queue):
     new_invitation = invite_service.invite()
     assert new_invitation == new_member.portfolio_invitations[0]
     assert len(queue.get_queue()) == 1
+
+
+def test_invite_application_member(queue):
+    inviter = UserFactory.create()
+    new_member = UserFactory.create()
+    application = ApplicationFactory.create()
+    member = ApplicationRoleFactory.create(user=new_member, application=application)
+    invite_service = Invitation(inviter, member, new_member.email)
+    new_invitation = invite_service.invite()
+    assert new_invitation == new_member.application_invitations[0]
+    assert len(queue.get_queue()) == 1
diff --git a/translations.yaml b/translations.yaml
index 43d406f5..7ec5a4e8 100644
--- a/translations.yaml
+++ b/translations.yaml
@@ -65,6 +65,7 @@ flash:
   next_steps: Review next steps below
   portfolio_home: Go to my portfolio home page
   success: Success!
+  new_application_member: 'You have successfully invited {user_name} to the team.'
 footer:
   about_link_text: Joint Enterprise Defense Infrastructure
   browser_support: JEDI Cloud supported on these web browsers