Selected work

Selected Professional Work

Anonymized examples of backend engineering, systems integration, legacy modernization, and data automation.

About these examples

Professional experience, presented with appropriate context

The following examples are drawn from David Leonhardt's professional engineering experience. Identifying details have been generalized to respect the confidentiality of the organizations involved.

These examples demonstrate the engineering experience and approach behind D. M. Leonhardt Consulting; they are not presented as client engagements of the company.

Customer Management & Enterprise Integration

Challenge

A retiring third-party capability supported customer and account management across multiple connected systems for an internal support team.

Approach

David designed the backend architecture for an internal customer-management platform that consolidated operations across the connected systems.

Outcome

The internal platform replaced the retiring third-party capability and simplified account management for the internal support team.

Demonstrates

Backend Architecture
API Development
Systems Integration
Automated Testing
Technical Documentation

Automated Data Reconciliation

Challenge

An organization depended on an aging application to reconcile operational data between related business systems. Problems with the existing application resulted in missing information and inconsistent metrics used by the business.

Approach

David worked directly with the business owner to understand the desired outcome and used the existing application's behavior to establish the technical requirements for its replacement.

The solution focused on replacing the unreliable process with a straightforward application and scheduled automation rather than introducing unnecessary complexity.

Outcome

The replacement resolved the known missing-data problem and produced consistent reconciliation results according to the required schedule. Results were reviewed directly with the business owner to verify that the solution satisfied the business requirement.

Demonstrates

Legacy Modernization
Data Automation
Requirements Discovery
Pragmatic Engineering

Automated Regulatory Data Submission

Challenge

An organization needed to regularly provide payroll information to an external government system to support regulatory reporting requirements.

The required information existed within the organization's ERP system but needed to be extracted, transformed into a prescribed format, and submitted to the external system.

Approach

David worked directly with the organization's payroll team to understand and validate the required data.

He developed a scheduled backend process that extracted payroll information from the organization's ERP database, transformed it into the required XML format, and transmitted the resulting files to the external reporting system.

ERP Data
Extract & Validate
Transform
Required XML
Secure File Transfer

Outcome

The organization gained a repeatable automated process for generating and submitting required payroll information, supporting its ongoing reporting obligations.

Demonstrates

ETL
Systems Integration
Process Automation
XML
Backend Development

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