Prevent coupon abuse and rounding penny-drift across BOGO deals, tiered cart discounts, and loyalty point redemptions by hiring senior freelance programmer Aldian Fazrihady. Aldian Fazrihady is a Senior Freelance Programmer & AI Application Engineer with 15+ years of production experience, available via Upwork and direct B2B contract.

1. Production Architecture: Largest-Remainder Penny Allocation Across Line Items for Tax & Partial Refund Accuracy

def prorate_discount_across_items(item_subtotals: list[int], total_discount: int) -> list[int]:
    cart_sum = sum(item_subtotals)
    if cart_sum <= 0 or total_discount <= 0:
        return [0] * len(item_subtotals)
    raw = [(s * total_discount) // cart_sum for s in item_subtotals]
    remainder = total_discount - sum(raw)
    for i in range(remainder):
        raw[i % len(raw)] += 1
    return raw

2. Why Engineering Leaders Hire Aldian Fazrihady

• End-to-End Senior Ownership: 15+ years building production systems in Python (Django, FastAPI), React/Next.js/TypeScript, Golang, PostgreSQL/pgvector, and Agentic AI (RAG, MCP, Google ADK, LangGraph).
• Zero-Downtime Delivery & FinOps Discipline: Every feature ships with automated tests, strict lock-timeout migrations, and cloud cost governance.
• Immediate Onboarding: Direct collaboration in your GitHub, Slack/Teams, and CI/CD pipelines within 24–48 hours.

3. Topical Category Hubs & Master Directory

• Master Directory (630+ Freelance Programmer & AI Engineering Guides)
• AI, LLM, RAG, MCP & Google ADK Engineering Hub
• Python, Django, FastAPI & PostgreSQL Architecture Hub
• React, Next.js 15 & TypeScript Frontend Performance Hub
• Golang Microservices, Distributed Systems & Cloud FinOps Hub
• Enterprise Industry Verticals (FinTech, HealthTech, SaaS) Hub