Daramola A.

I help SaaS founders and marketplace owners turn fragile, rapidly built Stripe setups into bulletproof, production-grade payment systems, so you can stop worrying about hidden billing bugs and focus on scaling your business with total confidence. AI app builders and modern dev tools get you to market fast. But when it comes to real money, automated prompts, starter templates, and rushed setups routinely miss edge cases, drop webhooks, or mess up subscription sync. Building fast is great, but your cash flow needs human precision. I specialize in auditing pre-existing and AI-assisted codebases, pinpointing silent revenue leaks, and hardening your Stripe integration for production scale. FEATURED PROJECTS AND MARKETPLACE LOGIC - Barbers and Grooming Marketplace: I built the complete payment workflow between clients and local barbers. When a customer books a haircut, a temporary hold is placed on their card instead of charging them immediately. Once the haircut is finished, the app automatically captures the payment, takes the platform commission fee, and routes the remaining balance straight to the barber bank account. I also built automatic refund logic for early cancellations and late-cancellation penalty charges. - On-Demand Plumbers and Electricians Marketplace: I solved the issue of unpredictable job costs for home service technicians. When a customer calls a plumber or electrician, an initial authorization is made on their card. If the repair requires extra parts or labor once the technician arrives on site, my setup handles top-up authorization before work starts. Funds are held safely during the job and only released to the tradesperson after the customer signs off on the completed work, protecting both parties against disputes. - Glowyfly Pest Control Marketplace: I set up the full payment and payout infrastructure connecting homeowners with pest control professionals. The system holds booking deposits upfront, releases payouts automatically once technicians submit photo verification of job completion, and automatically calculates local service taxes based on where the job took place. - Hybrid AI Billing Engine: I built a custom billing system for an AI platform that needed both a monthly subscription fee and pay-as-you-go credit packages. I handled automatic credit refills when a user runs low, prorated upgrades when users switch plans mid-month, and prevented race conditions so users could never consume credits without paying. - GeneAI Medical Research Tool: I helped an AI medical research platform connect their payment system directly to user account permissions. When a team adds new seats or upgrades their plan, their access changes instantly. If a payment fails or a plan is downgraded, the system automatically revokes access to premium features without manual intervention. - CIP TopUp Payment Overhaul: I helped a high-scale payment platform with over 50,000 active users rebuild their broken webhook setup. The system was dropping transactions and crashing under heavy load. I refactored their background processing and event handling, bringing their crash rate down from 38% to 0.2% while helping them support an 80% growth in users. AI BUILDERS AND TOOLS I WORK WITH - App Builders: Bolt.new, Lovable, Base44, v0 - AI Assistants and Models: Claude, Google AI Studio, Cursor, OpenAI Codex, ChatGPT WHAT I DO - Stripe Checkout, Billing and Subscriptions - plans, trials, upgrades/downgrades, proration, cancellation - Stripe Connect - marketplaces, connected accounts, payouts, platform fees and escrow flows - Hybrid Billing Models - monthly/yearly base fees combined with AI credit balance top-ups - Signed webhooks, idempotent event handling, retries and recovery for failed processing - Payment status and customer access entitlement synchronization - Failed payments, refunds, disputes, multi-currency and tax/VAT (Stripe Tax) - Auditing, repairing, and productionizing custom, template-based, or AI-assisted Stripe setups MY STACK Next.js, React, TypeScript, Node.js, Python (Django/FastAPI), PostgreSQL, Supabase, Prisma, REST APIs, AWS, Docker, Kubernetes and CI/CD. As a senior full-stack engineer, I also fix the application architecture around the payment flow - auth, roles, admin dashboards, APIs, deployment, testing and documentation. Have a payment issue or want a second opinion on your Stripe setup? Send me a quick message describing what your app is doing versus what it should be doing, or paste the Stripe error event; that is enough to start.