API & Payments Integration by Sergio PereyraAPI & Payments Integration by Sergio Pereyra
API & Payments IntegrationSergio Pereyra
I wire up payment systems, third-party APIs, and data integrations into your existing app so you can start processing transactions and connecting services fast.
Who this is for: Founders and teams who need Stripe, Plaid, or other payment/API integrations added to their product, done right the first time, without breaking what already works.
What you get: A fully integrated payment flow or API connection, tested with real transactions, deployed to production, and documented for your team.
My stack: Stripe (Connect, Billing, Checkout), Plaid, PayPal, REST APIs, GraphQL, webhooks, Node.js, Python, Next.js, PostgreSQL.
How it works:
Week 1: Audit your current architecture + design the integration plan + set up sandbox environments
Week 2: Build the integration, handle edge cases (failed payments, retries, webhooks), and test with real scenarios
Track record:
NextBlock.io: Stripe integration powering $250K revenue in the first 2 months
InterviewIz.com: Payment and subscription system handling thousands of monthly transactions
Multiple SaaS platforms with Stripe Connect, marketplace payouts, and subscription billing
I've built payment systems that process real money from day one. If you need integrations that don't break at scale, let's talk.
FAQs

Starting at$2,000
Duration2 weeks
Tags
Next.js
Node.js
Python
React
Stripe
API Development
Fullstack Engineer
Payments
Service provided by
Sergio Pereyra Frankfurt, Germany
$1k+
Earned
3
Paid projects
5.00
Rating
38
Followers
API & Payments IntegrationSergio Pereyra
Starting at$2,000
Duration2 weeks
Tags
Next.js
Node.js
Python
React
Stripe
API Development
Fullstack Engineer
Payments
I wire up payment systems, third-party APIs, and data integrations into your existing app so you can start processing transactions and connecting services fast.
Who this is for: Founders and teams who need Stripe, Plaid, or other payment/API integrations added to their product, done right the first time, without breaking what already works.
What you get: A fully integrated payment flow or API connection, tested with real transactions, deployed to production, and documented for your team.
My stack: Stripe (Connect, Billing, Checkout), Plaid, PayPal, REST APIs, GraphQL, webhooks, Node.js, Python, Next.js, PostgreSQL.
How it works:
Week 1: Audit your current architecture + design the integration plan + set up sandbox environments
Week 2: Build the integration, handle edge cases (failed payments, retries, webhooks), and test with real scenarios
Track record:
NextBlock.io: Stripe integration powering $250K revenue in the first 2 months
InterviewIz.com: Payment and subscription system handling thousands of monthly transactions
Multiple SaaS platforms with Stripe Connect, marketplace payouts, and subscription billing
I've built payment systems that process real money from day one. If you need integrations that don't break at scale, let's talk.
FAQs

$2,000