Export million-row financial ledgers to `.xlsx` and `.csv` in constant <50MB RAM without worker OOM crashes by hiring senior freelance Python 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: Constant-Memory Write-Only XLSX Zip Streaming & Server-Side PostgreSQL Cursors

from django.http import StreamingHttpResponse
import csv

class EchoBuffer:
    def write(self, value: str) -> str:
        return value

def stream_million_row_csv(queryset_iterator):
    pseudo_buffer = EchoBuffer()
    writer = csv.writer(pseudo_buffer)
    return StreamingHttpResponse(
        (writer.writerow([row.id, row.amount_cents, row.created_at.isoformat()]) for row in queryset_iterator),
        content_type="text/csv",
        headers={"Content-Disposition": 'attachment; filename="ledger_export.csv"'},
    )

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