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Services/Custom Software Development

Custom Accounting Software & Integrations for Businesses and Firms in Mexico

AISDC designs and builds tailored accounting systems and integrations that fit the real workflows of your business or accounting firm. We connect your accounting with your operational systems, automate CFDI downloads and reconciliation from Mexico's SAT, and generate the reports and files required for fiscal compliance. We are not an off-the-shelf package — every solution is built around your specific processes and requirements.

How we work

1. Discovery and diagnosis

We analyze your current accounting processes, the systems you already use (ERP, invoicing, payroll, banking), and the friction points: manual data entry, delayed reconciliations, CFDI mismatches, or reporting gaps. Together we define the real project scope.

2. Solution design

We design the system or integration architecture: data flows, chart of accounts, reconciliation rules, required modules, and connections to external systems. We validate the design with you before writing a single line of code.

3. Development and integration

We build the custom system or connectors: SAT bulk downloads, automated bank reconciliation, integration with CONTPAQi, Aspel, or other packages, journal entry generation, and XML files for the SAT. We test with real data from your operation.

4. Launch and ongoing support

We deploy the solution to production, train your accounting and IT teams, and support the initial rollout. We provide technical support, adjustments for SAT rule changes, and system evolution as your needs grow.

What it includes

Journal entries and chart of accounts

Modules for entry, validation, and classification of journal entries against your company's chart of accounts, with configurable business rules and a full audit trail.

Automated bank reconciliation

We automate the reading of bank statements and their reconciliation against your recorded accounting movements, reducing month-end close time and manual errors.

CFDI download and reconciliation from SAT

We connect to SAT's bulk download service to retrieve your issued and received electronic invoices (CFDI), and automatically reconcile them against your accounting and treasury records.

Financial statements and reporting

We generate balance sheets, income statements, cash flow statements, and custom reports in the formats required by your management, board, or auditors.

Invoicing and payroll integration

We connect your electronic invoicing and payroll systems to accounting so that transactions are recorded automatically, eliminating double entry and reconciliation errors.

Electronic accounting for SAT

We generate the XML files for the chart of accounts, trial balance, and journal entries in the format required by Mexico's SAT for electronic accounting submissions, adapted to your account structure.

Use cases

Company integrating accounting with operational systems

A business with its own ERP, point-of-sale, or logistics system needs transactions to flow automatically into accounting. AISDC builds the connectors and classification rules so that month-end close no longer depends on manual exports.

Accounting firm managing multiple clients

A firm handling accounting for several companies may need a centralized platform to download CFDI, reconcile movements, and generate SAT reports and files for each client efficiently. AISDC designs that workflow around the firm's own processes.

Company automating CFDI and bank reconciliation

Organizations with high invoice and transaction volumes that currently reconcile in spreadsheets can hand that process to a system that downloads, compares, and flags discrepancies automatically, freeing up the accounting team for higher-value work.

Integrations

SAT bulk CFDI download (FIEL / e.firma)CONTPAQi (Contabilidad, Bancos, Comercial, Nóminas)Aspel (COI, SAE, NOI, BANCO)Mexican banks for automated reconciliationElectronic invoicing systems (CFDI 4.0)Payroll and disbursement systemsEnterprise ERPs (SAP, Oracle, custom-built systems)Spreadsheets and reporting tools (Excel, Google Sheets)

Frequently asked questions

What is custom accounting software?+

It is a system designed specifically for your company's or firm's accounting processes, rather than a generic off-the-shelf package. It can be a full system, a module that extends your current package, or integrations that automate flows between existing systems. The goal is for technology to adapt to your operation, not the other way around.

Does AISDC replace CONTPAQi, Aspel, or other accounting packages?+

Not necessarily. CONTPAQi, Aspel, and similar tools are certified packages with validated accounting and tax engines. AISDC can integrate with them: extract data, feed information from other systems, automate reconciliations, or build complementary modules. If your operation requires a fully custom system for specific reasons, we build that too — but we honestly assess which approach makes more sense for each situation.

Can the system automate CFDI and bank reconciliation?+

Yes. We connect to SAT's bulk download service to retrieve your issued and received CFDI, and automate reconciliation against your accounting records and bank statements. The system identifies discrepancies and generates alerts, significantly reducing manual work at close.

Does it generate the electronic accounting files for SAT?+

Yes. We can generate the XML files for the chart of accounts, trial balance, and journal entries in the format established by Mexico's SAT for electronic accounting, adapted to your company's account structure. We recommend having your accountant or auditor validate final compliance.

When does a custom system make sense versus a standard package?+

A standard package like CONTPAQi or Aspel is a good fit when your company's processes can adapt to their predefined workflows and the volume does not justify custom development. A tailored system or custom integration makes sense when you have differentiated processes, multiple systems that need to communicate, high transaction volumes requiring automation, or reporting needs that standard packages do not cover. AISDC helps you evaluate which path is right for your situation.

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