ReimeiTech
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User Management Systems

Auth, Teams, Roles,and Invitations —Done Right, Once.

ReimeiTech builds the identity layer your product depends on: secure authentication, SSO, MFA, accounts, teams, organizations, granular permissions, invitations, SCIM provisioning, and the full account lifecycle.

Not a bolted-on login. A real identity foundation — including the messy edge cases (email changes, account merges, nested orgs, deletion compliance) that quietly break every system that didn't plan for them.

AuthenticationSSO & SAMLMFATeams & OrgsRoles & PermissionsInvitationsSCIM ProvisioningAccount Lifecycle
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02Definition

What Is a User Management System?

A user management system is the identity layer behind your product — everything about who someone is and what they're allowed to do.

It covers authentication, accounts and profiles, teams and organizations, roles and permissions, invitations and onboarding, sessions, and the full lifecycle from signup to deletion. Build it once, properly, and you never fight it again.

Identity layer
Who they are · what they can do
What you'll outgrow

Bolt-On Login

  • A login form and a users table
  • Roles hardcoded as if/else checks
  • No real team or organization model
  • Permissions hidden only in the UI
  • No SSO, no SCIM, no MFA path
  • Edge cases (merges, deletion) ignored

Fine for a demo. The first enterprise deal — or the first GDPR request — breaks it.

What we build

User Management System

  • Provider-grade authentication + MFA
  • Teams, orgs, and nested hierarchies
  • Granular roles enforced on the backend
  • Invitations, onboarding, and recovery
  • SSO (SAML/OIDC) and SCIM provisioning
  • Full lifecycle + compliance built in

A real identity foundation that scales from your first user to your largest enterprise customer.

03The problem

When Your Identity Layer Starts to Crack.

Auth is easy to start and brutal to retrofit. We build the user system so it's secure from day one and ready for enterprise when the deal arrives.

Identity layer under strain

"We'll add SSO later."— the sentence that costs three months and one enterprise deal.

Enterprise prospects keep asking for SSO and SCIM
Your team model can't handle nested orgs
Permissions are scattered if/else checks
Account-deletion compliance is overdue
Password resets and recovery are fragile
No MFA path for security-conscious customers
Invitations and onboarding are ad-hoc
Email changes and account merges break things
Support can't help without database access
Sessions and logins aren't properly secured
04What we build

User Systems We Can Build.

Authentication Systems

Authentication Systems

Secure sign-in built on a hardened foundation — passwords done right, passwordless options, MFA, and session management.

  • Email & password + reset
  • Magic links & OTP
  • Passkeys / WebAuthn
  • TOTP & SMS MFA
  • Session & device management
  • Provider integration (Clerk, Auth0, WorkOS)
Teams & Organization Systems

Teams & Organization Systems

Workspaces, organizations, and nested hierarchies with membership, ownership, and seat management modelled correctly.

  • Workspaces & organizations
  • Nested org hierarchies
  • Membership & ownership
  • Ownership transfer
  • Seat management
  • Per-org settings
Roles & Permission Systems

Roles & Permission Systems

Role-based and attribute-based access control, enforced on the backend API — not hidden in the interface.

  • RBAC role hierarchies
  • Per-resource permissions
  • Attribute-based rules (ABAC)
  • Custom roles
  • Permission inheritance
  • Policy enforcement layer
SSO & Enterprise Identity

SSO & Enterprise Identity

Single sign-on and directory provisioning that unlock enterprise deals — SAML, OIDC, SCIM, and domain capture.

  • SAML 2.0 SSO
  • OIDC connections
  • SCIM provisioning
  • Okta / Entra / Google
  • Per-domain enforcement
  • Just-in-time provisioning
Invitation & Onboarding Systems

Invitation & Onboarding Systems

Invite, accept, and onboard users into the right team with the right role — with the statuses and reminders to track it.

  • Email invitations
  • Bulk & domain invites
  • Role-scoped invites
  • Onboarding flows
  • Invitation expiry & resend
  • Self-serve join requests
Account Lifecycle & Compliance

Account Lifecycle & Compliance

The full lifecycle — signup, activation, suspension, recovery, and deletion — built for GDPR / APPI compliance.

  • Activation & verification
  • Suspension & reactivation
  • Account recovery
  • Right-to-be-forgotten deletion
  • Data export & portability
  • Audit & consent tracking
05Core features

Core Capabilities We Can Build.

The complete identity toolkit — 24 building blocks. We ship the subset your product needs now, with room for the rest as you grow.

Secure sign-up & login
Password reset & recovery
Email verification
Magic links
Social login (OAuth)
SAML / OIDC SSO
Multi-factor auth
Passkeys / WebAuthn
User profiles
Teams & workspaces
Organizations
Nested org hierarchies
Role-based access (RBAC)
Attribute-based access
Per-resource permissions
Invitations
Onboarding flows
Session management
Device & login history
Account suspension
Account deletion (GDPR/APPI)
Data export
SCIM provisioning
Audit logs
06Architecture

How a User System Is Structured.

Every request flows the same way: authenticate the user, verify the session, then authorize the action against roles and organization membership — with everything logged for audit.

User system architecture

"Authentication proves who you are. Authorization decides what you can touch."

Step 01
User
Step 02
Authenticate / SSO
Step 03
MFA + Session
Step 04
Authorize
Identity
  • Credentials
  • OAuth / SAML
  • Passkeys
  • MFA factors
Account Store
  • Users
  • Profiles
  • Sessions
  • Devices
Org Model
  • Teams
  • Organizations
  • Memberships
  • Seats
Policy Engine
  • Roles
  • Permissions
  • ABAC rules
  • Enforcement
Lifecycle & Audit
  • Invitations
  • Suspension
  • Deletion
  • Audit logs
07Authentication

Every Way to Sign In Securely.

We support the full range of authentication methods and let you mix them per product, per role, or per organization — from one-click social login to phishing-resistant passkeys.

Authentication methods

"One identity. Many doors. Every one of them locked properly."

Email & Password

Hardened password storage, strength policy, breach-list checks, and secure reset.

Magic Links

Passwordless email sign-in with single-use, expiring tokens.

OTP / SMS Codes

One-time codes by SMS or email for sign-in and verification.

Social Login (OAuth)

Google, Microsoft, GitHub, Apple — one-click onboarding.

SAML / OIDC SSO

Enterprise single sign-on against any identity provider.

Passkeys / WebAuthn

Phishing-resistant biometric and hardware-key authentication.

TOTP Authenticator

Time-based codes from Google Authenticator, Authy, 1Password.

Backup & Recovery Codes

Recovery codes and safe fallback flows for lost factors.

08Roles & permissions

Granular Access, Enforced on the Backend.

From simple roles to per-resource, attribute-based rules — every permission is checked on the API, so the UI can hide a button but the server still says no.

Roles and permissions

"Hiding the button isn't security. We enforce every rule where it counts."

Example roles
OwnerAdminManagerMemberBilling adminSupport agentEditorContributorViewerGuest

Roles are a starting point — we model custom roles, inheritance, and attribute-based rules to match exactly how your business works.

Permission matrix · example
rbac.policy
CapabilityOwnerAdminMemberViewer
Manage billing & plan
Invite & remove users
Assign roles
Create & edit records
View reports
Delete the organization
09Teams & organizations

Model Teams the Way Your Business Actually Works.

This is where bolt-on auth breaks first. We model workspaces, organizations, sub-teams, and nested hierarchies from the start — so a customer with 5 departments and 200 seats just works.

Teams and organizations
Org structure

One account, many teams, the right access everywhere.

Workspaces & organizations
Nested org hierarchies
Membership management
Ownership & transfer
Seat management
Per-organization settings
Domain-based org capture
Cross-org collaboration
10Invitations & onboarding

Get the Right People Into the Right Team.

Invitations and onboarding

"From invite to onboarded — scoped to the right role at every step."

Invitation flow
01
Admin sends invite
02
Email delivered
03
User accepts
04
Verifies identity
05
Joins with role
06
Guided onboarding
Invitation statuses
PendingSentAcceptedExpiredRevokedResent
11Account lifecycle

The Whole Journey — Signup to Deletion.

Most user systems handle signup and login, then fall apart at everything after. We build the complete lifecycle and the edge cases — because that's where accounts actually break.

Lifecycle states
Sign up
Verify
Active
Suspended
Recovered
Deactivated
Deleted
Account lifecycle
No account left behind

Every state transition is deliberate, reversible where it should be, and logged.

The edge cases we handle
Email change with re-verification
Account merge & de-duplication
Ownership transfer on departure
Reactivate a suspended account
Recover without takeover risk
Re-invite a removed member
Hard delete vs. anonymize
Grace period before deletion
12Enterprise identity

SSO & SCIM That Unlock Enterprise Deals.

"Do you support SSO and SCIM?" is the question that gates enterprise contracts. We build it so the answer is yes — with the IdP they already use.

Enterprise SSO and SCIM

"The feature that turns 'we'll evaluate next year' into a signed contract."

SAML 2.0 SSO

Single sign-on against Okta, Azure AD / Entra, OneLogin, Ping, Google Workspace, and any SAML IdP.

OIDC Connections

OpenID Connect for modern identity providers and federated login.

SCIM Provisioning

Auto provision and de-provision users from the customer's directory — joiners and leavers sync automatically.

Directory Sync

Keep groups, roles, and memberships in step with the source-of-truth directory.

Per-Domain Enforcement

Require SSO for a verified email domain — no passwords for that org.

Just-in-Time Provisioning

Create the account on first SSO login with the correct role and org.

13Security

Security at the Identity Layer.

The user system is your most attacked surface. We build it with defense in depth — from password hashing to session rotation to abuse monitoring.

Identity security

"Auth is the front door. We don't leave it unlocked."

Hashed & salted passwords
Multi-factor authentication
Secure session management
Rotating refresh tokens
Breached-password detection
Rate limiting & lockout
Protected API routes
Input validation
PII encryption at rest
Force logout & revoke
Security audit logs
Anomaly & abuse monitoring
14Profile & account

Self-Serve Account Management.

Users should manage their own identity safely — profile, security, sessions, and connected accounts — without filing a support ticket for every change.

Account settings
account.settings
2 devices
My account

Everything about my identity, in one safe place.

Profile & avatar
Email change + re-verify
Password & reset
MFA setup & recovery
Connected social accounts
Active devices & sessions
Login history
Notification preferences
Organization memberships
Delete my account
15Admin tooling

The Tools Your Support Team Has Been Asking For.

Turn three-hour escalations into thirty-second fixes — and keep engineers out of the production database. Every admin action is logged.

User admin console
Operator console

Find a user, fix the issue, log the action.

User search & lookup
Secure impersonation
Assign & change roles
Force logout / revoke sessions
Lock & unlock accounts
Resend & revoke invitations
Reset MFA & credentials
Per-user audit trail
16Compliance & privacy

GDPR & APPI, Built Into the Lifecycle.

Compliance shouldn't be a fire drill. We build the user system so deletion, export, consent, and audit are settings — not emergency engineering projects.

Compliance and privacy

"When the deletion request arrives, it should be one click — not one sprint."

Right-to-be-forgotten deletion
Data export & portability
Consent tracking
Configurable retention
Access & change audit logs
Data-residency options
Privacy-by-design defaults
Least-privilege access
17Integrations

Identity Providers & Tools We Connect.

Identity integrations

"Whatever identity provider your customer uses — we speak it."

Integrates with
ClerkAuth0WorkOSSupabase AuthOktaAzure AD / EntraOneLoginPing IdentityGoogle WorkspaceMicrosoft 365Firebase AuthCognitoStripe (seats/billing)SlackSendGrid / ResendTwilioCustom IdPInternal directory
Possible actions
  • Verify identity
  • Federate SSO login
  • Provision via SCIM
  • Sync directory groups
  • Map seats to billing
  • Send invite & alert emails
  • Send MFA codes
  • Log auth events
18Deliverables

What You Receive.

Deliverables

"A complete identity layer, hardened and documented — not a login form and a wish."

01Identity requirements review
02Auth provider integration
03User & profile model
04Team & organization model
05Roles & permission system
06Backend policy enforcement
07Invitation & onboarding flows
08Session management
09Multi-factor authentication
10SSO (SAML / OIDC)
11SCIM provisioning
12Account lifecycle flows
13Self-serve account settings
14Admin & support tooling
15Audit & activity logs
16GDPR / APPI compliance
17Data export & deletion
18User migration (if needed)
19Security hardening
20Testing & QA
21Documentation
22Rollout & support plan
19Technology

Technology We Use.

Technology stack

"Open standards over lock-in — so your identity layer is yours to keep."

Frontend
ReactNext.jsTypeScriptTailwind CSS
Backend
PythonFastAPINode.jsExpress
Database
PostgreSQLRedisSupabaseRow-level security
Auth providers
ClerkAuth0WorkOSSupabase AuthCustom
Protocols
OAuth 2.0OIDCSAML 2.0SCIM 2.0WebAuthn
MFA
TOTPSMS / Email OTPPasskeysRecovery codes
Enterprise
OktaAzure AD / EntraOneLoginGoogle Workspace
Cloud
AWSVercelDockerCI/CD
Security
RBAC / ABACEncrypted PIIAudit logsRate limiting
20Demo

Example Enterprise Onboarding.

Demo
Recommended demo

Enterprise SSO & SCIM Onboarding.

An enterprise customer connects their identity provider, SCIM auto-provisions their team, employees sign in with SSO, roles map from directory groups, MFA is enforced org-wide, leavers are de-provisioned, and every action is audited.

01
Enterprise admin connects SSO
02
SCIM syncs the directory
03
Employees provisioned automatically
04
Staff sign in with SSO
05
Roles mapped from groups
06
MFA enforced org-wide
07
Leavers de-provisioned
08
Every action audited
21Industries

Who User Management Systems Are For.

SaaS platforms

SaaS platforms

Accounts, teams, roles, invitations, and self-serve billing seats — the identity layer every SaaS needs.

Enterprise & B2B

Enterprise & B2B

SAML SSO, SCIM provisioning, granular permissions, and audit — what enterprise procurement requires.

Healthcare teams

Healthcare teams

Strict access control, MFA, audit trails, and compliant lifecycle for sensitive patient and staff data.

FinTech companies

FinTech companies

Hardened auth, step-up MFA, device trust, and rigorous audit for financial-grade identity.

Marketplaces & agencies

Marketplaces & agencies

Multi-sided accounts, client portals, vendor roles, and per-org permissions across many parties.

Education & communities

Education & communities

Cohorts, roles, bulk invitations, and Google/Microsoft sign-in for students, staff, and members.

22Process

How We Build User Systems.

Identity Discovery
Step 01

Identity Discovery

We map who your users are, how teams and orgs are structured, what roles exist, and what enterprise will demand.
Model & Policy Design
Step 02

Model & Policy Design

We design the account, org, and permission model, choose the auth foundation, and define the policy engine.
Auth & Flow Design
Step 03

Auth & Flow Design

We design sign-in, MFA, invitations, onboarding, account settings, and the lifecycle states.
Development
Step 04

Development

We build authentication, the org model, backend-enforced permissions, invitations, admin tooling, and integrations.
Security & QA
Step 05

Security & QA

We test permissions, sessions, edge cases, abuse paths, and run security hardening across the identity surface.
Migration & Launch
Step 06

Migration & Launch

We migrate existing users safely, roll out SSO/MFA gradually, and deploy with no one locked out.
Improvement
Step 07

Improvement

We add enterprise features, new roles, and provider connections as your customers and compliance needs grow.
23What this is not

What a User Management System Is Not.

What this is not

"Build the identity foundation once — secure, complete, and ready for the enterprise deal before it arrives."

Just a login form
Roles as hardcoded if/else
Permissions only in the UI
Auth you'll rebuild for enterprise
Compliance bolted on in a panic
24FAQ

Frequently Asked Questions.

It's the identity layer behind your product — everything to do with who someone is and what they're allowed to do. Authentication (login, SSO, MFA), accounts and profiles, teams and organizations, roles and permissions, invitations and onboarding, sessions, and the full account lifecycle from signup to deletion. Done once, properly, so you never have to rebuild it.
Build your identity layer / 26

Ready to Build Your
User Management System?

Tell us how your users, teams, roles, and customers are structured — and what enterprise is asking for. We'll design and build the identity layer your product depends on: auth, teams, roles, invitations, SSO, and SCIM, done right, once.

ReimeiTech builds user management systems that give your product secure authentication, teams and organizations, granular roles, invitations, enterprise SSO and SCIM, and a compliant account lifecycle — the identity foundation, done right, once.