B2B SaaS platforms, multi-vendor marketplaces, and AI token-metered applications frequently search to hire a freelance Stripe Connect, Paddle & LemonSqueezy SaaS billing programmer. I am Aldian Fazrihady, a Senior Freelance Full Stack Developer and AI Application Engineer available via Upwork.

Core SaaS Billing & Marketplace Payout Capabilities

  • Stripe Connect Custom & Express Marketplaces: Architecting split payments, escrow holds, automated KYC onboarding, and cross-border payouts with double-entry PostgreSQL ledger reconciliation.
  • Usage-Based & AI Token Metering: Implementing real-time credit balance deduction, Stripe Billing Meters, automatic top-ups, and hard spend limits for LLM/AI SaaS platforms.
  • Merchant of Record (Paddle & LemonSqueezy): Integrating global VAT/sales-tax compliant checkouts, idempotent webhook state machines, and seat-based proration upgrades.

Frequently Asked Questions

How do you prevent race conditions or double-charging on Stripe webhooks?

I enforce PostgreSQL unique constraints on Stripe event IDs, use `SELECT ... FOR UPDATE` row locking on subscription records, and pass deterministic idempotency keys on all outbound Stripe API mutations.

How can we hire you as a freelance Stripe & SaaS billing programmer?

Hire me directly on Upwork or email mobile@aldianfazrihady.com.

About the Author — Hire Freelance Programmer Aldian Fazrihady

Aldian Fazrihady is a Top-Rated Senior Freelance Programmer, Freelance Full Stack Developer, and AI Application Engineer with 15+ years of production software engineering experience and Google Cloud Professional Cloud Architect & Data Engineer certifications. He specializes in building custom LLM & autonomous AI agents, RAG pipelines, Next.js/React PWAs, Python (Django/FastAPI), Go microservices, and serverless cloud infrastructure on Google Cloud Run and AWS.

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