> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lerian.studio/llms.txt
> Use this file to discover all available pages before exploring further.

# Why Lerian

> Understand how Lerian helps financial institutions modernize core banking without vendor lock-in: a source-available ledger, modular products, and flexible deployment.

export const GSourceAvailable = ({children}) => <Tooltip headline="Source-available" tip="A licensing model where the source code is publicly accessible for inspection, modification, and self-hosting, while certain commercial uses may require a license." cta="See glossary" href="/en/start-here/glossary">
    {children}
  </Tooltip>;

Modern financial institutions face a common set of challenges. Legacy systems cost too much to maintain, and they adapt too slowly. They also lock you into vendors who dictate the roadmap.

Lerian gives you back control.

<Note>
  **New to core banking?** If terms like *Ledger*, *debit and credit*, or *chart of accounts* are new to you, start with the fundamentals first. They make everything here easier to follow.

  **[Begin with Core Banking Fundamentals](/en/start-here/fundamentals/core-banking/what-is-core-banking)**
</Note>

## The problems we solve

***

| Challenge                 | How Lerian helps                                                                                                                                                           |
| :------------------------ | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Vendor lock-in**        | Midaz, our core ledger, is <GSourceAvailable>source-available</GSourceAvailable>, so you own the foundation of your infrastructure. No single vendor controls your roadmap |
| **Slow time-to-market**   | Modular platform lets you launch new products in weeks, not months                                                                                                         |
| **Compliance burden**     | Built-in audit trails, regulatory reporting, and immutable records reduce manual compliance work                                                                           |
| **Reconciliation errors** | Automated reconciliation replaces manual spreadsheet matching, catching discrepancies in real time                                                                         |
| **Operational cost**      | Replace multiple disconnected systems with one composable platform                                                                                                         |
| **Scaling limitations**   | Handle millions of transactions per day without re-platforming                                                                                                             |

## What the platform includes

***

| Business need                       | Lerian product | What it does                                                                                            |
| :---------------------------------- | :------------- | :------------------------------------------------------------------------------------------------------ |
| Central financial record-keeping    | **Midaz**      | Manages accounts, balances, and transactions with full audit trails                                     |
| Regulatory and business reporting   | **Reporter**   | Generates compliance reports (BACEN, SOX) and business analytics automatically                          |
| Transaction reconciliation          | **Matcher**    | Compares internal records against bank statements and payment processors — flags discrepancies          |
| Real-time transaction controls      | **Tracer**     | Validates transactions against spending limits and business rules before they execute                   |
| Workflow automation                 | **Flowker**    | Automates approval flows, anti-fraud checks, and payment orchestration                                  |
| Credit products and loan management | **Lender**     | Defines loan products and manages the loan lifecycle — applications, disbursement, and interest accrual |

Console, Access Manager, Streaming Hub, Multi-tenancy, and Observability are platform services. They serve every product and are not products themselves.

| Platform service   | What it does                                                                                           |
| :----------------- | :----------------------------------------------------------------------------------------------------- |
| **Console**        | Operates every Lerian product from one web interface, with one login                                   |
| **Access Manager** | Controls human and machine access, and issues the tokens each service trusts                           |
| **Streaming Hub**  | Delivers platform events to your webhooks, cloud queues, or pull consumers                             |
| **Multi-tenancy**  | Serves independent customer contexts from one deployment, and keeps each request inside its own tenant |
| **Observability**  | Collects metrics, traces, and logs from Lerian workloads through OpenTelemetry                         |

## Deployment flexibility

***

You choose how to run the platform:

* **Fully managed (SaaS)**: Lerian handles everything. Your team focuses on configuration and business logic. Fastest path to production.
* **Your infrastructure (BYOC)**: Deploy in your own cloud or on-premises. Full control over data residency, security, and compliance boundaries.

Both options support the full product portfolio. Choose based on your regulatory requirements and operational maturity.

[Compare deployment models in detail →](/en/start-here/evaluate-and-deploy/deployment-models)

## Built for trust and independence

***

* **Source-available core**: Midaz, our ledger, is source-available. Inspect, audit, and extend the core that holds your money
* **No vendor lock-in**: Standard interfaces and open formats across the platform. You can always move
* **Compliance-ready**: Immutable audit trails, double-entry enforcement, and regulatory reporting ship built in
* **Incremental adoption**: Start with one product and expand as needed. No big-bang migration required

## Who uses Lerian

***

* **Digital banks** launching new financial products
* **Traditional banks** modernizing legacy cores incrementally
* **Fintechs** building embedded finance and payment platforms
* **Enterprises** consolidating payments, collections, and reconciliation across business units

## Next steps

***

<Columns cols={2}>
  <Card title="Our Core Banking vision" icon="building-columns" href="/en/start-here/about-lerian/core-banking-vision" cta="Read the vision">
    Understand the four pillars that form our architectural philosophy.
  </Card>

  <Card title="Getting started" icon="rocket" href="/en/start-here/getting-started" cta="Start here">
    Choose your path: evaluate the platform or start building.
  </Card>

  <Card title="Deployment models" icon="cloud" href="/en/start-here/evaluate-and-deploy/deployment-models" cta="Compare options">
    Understand the differences between fully managed and self-hosted deployment.
  </Card>

  <Card title="Talk to us" icon="comments" href="https://lerian.studio/en/contact" cta="Get in touch">
    Talk to us about your questions or a partnership.
  </Card>
</Columns>