Scale PostgreSQL to 25,000+ concurrent connections without connection exhaustion 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: Transaction-Mode PgBouncer Pooling, Read/Write Split Routing & Zero-Data-Loss Failover

class PrimaryReplicaRouter:
    """Django database router directing reads to replicas and writes to primary."""
    def db_for_read(self, model, **hints):
        if hints.get("force_primary"):
            return "default"
        return "replica"

    def db_for_write(self, model, **hints):
        return "default"

    def allow_relation(self, obj1, obj2, **hints):
        return True

2. Core Architectural Guarantees

• Transaction-Level Connection Multiplexing: Serving 10,000+ serverless or ASGI connections over 80 physical PostgreSQL backend processes via PgBouncer.
• Replication-Lag Aware Read Routing: Automatically pinning read-after-write session queries to the primary node while offloading analytics and search to read replicas.
• Index Bloat & Autovacuum Tuning: Eliminating transaction ID wraparound and table bloat on high-churn tables.

3. Topical Category Hubs & Master Directory

• Master Directory (465+ 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