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Proven Project Architecture

Custom Software Case Studies & Verified Build Outcomes

Engineering Case Studies Overview

Review real, detailed case studies of custom software systems engineered by lead developer David Osnas. Each project details the client industry, original operational bottlenecks, bespoke technical architecture, software stack, and verified operational outcomes.

Case Study 01 Client Type: Professional Consulting Firm

Client Portal Workspace & Automated Milestone Intake

Original Problem:

The firm relied on disorganised email threads, manual Google Drive folders, and unencrypted attachments for onboarding high-value clients. Milestone approvals required manual follow-ups, causing communication lag and delayed billing cycles.

What Was Built:

David Osnas built a bespoke client workspace portal with role-based authentication. Clients access real-time milestone progress bars, secure document upload dropboxes, and integrated invoice sign-offs.

Technology Stack: Python, Node.js, PostgreSQL / Supabase, Vanilla JS / CSS3, Stripe API
Verified Outcome: ✓ 100% elimination of missing onboarding docs & instant milestone invoicing
Case Study 02 Client Type: Independent Advisory & Sales Agency

Interactive AI Intake Agent & Lead Scoring Engine

Original Problem:

A high volume of website traffic submitted generic contact form inquiries. Sales executives wasted over 15 hours per week conducting discovery calls with low-budget or out-of-scope prospects.

What Was Built:

Engineered an interactive qualification assessment widget with real-time scoring logic. The tool evaluates prospect budget, timeline, and scope, generating an instant concept PDF summary and auto-directing qualified leads to calendar booking.

Technology Stack: JavaScript (ES6+), OpenAI API / Gemini API, Supabase, Calendly API
Verified Outcome: ✓ Filtered out 80%+ of unqualified inquiries before reaching sales calendars
Case Study 03 Client Type: Specialty Contracting & Field Services Firm

Automated Invoicing & QuickBooks Payment Synchronization

Original Problem:

Invoices were typed out manually on paper forms and spreadsheets. Payment collection took an average of 28 days, and accounting ledgers required manual weekly reconciliation in QuickBooks.

What Was Built:

Developed a custom billing pipeline with automated webhook listeners. Field job sign-offs instantly dispatch digital invoices via SMS/Email with embedded Stripe payment portals and sync ledgers to QuickBooks Online.

Technology Stack: Python, Stripe Webhooks, QuickBooks API, Twilio SMS API
Verified Outcome: ✓ Reduced invoice collection window from 28 days to under 48 hours

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