Upwork home
Sign up
Project Catalog
DesignDesign
Video & AudioVideo & Audio
Development & ITDevelopment & IT
MarketingMarketing
Writing & TranslationWriting & Translation
MoreMore

You will get Stripe & Payment Gateway Integration for Your Python Backend

Serhii M.Status: Offline
Serhii M. Serhii M.
Top Rated
Preview image

Let a pro handle the details

Buy Web Application Programming services from Serhii, priced and ready to go.
Serhii M.Status: Offline
Serhii M. Serhii M.
Top Rated
Preview image

Let a pro handle the details

Buy Web Application Programming services from Serhii, priced and ready to go.

Project details

I integrate payment gateways into production backends. Not a copy-pasted webhook handler that breaks under real traffic, but a system built to survive edge cases: duplicate webhooks, out-of-order events, network retries.
You get: signature-verified webhook handling, idempotent processing so retries never double-charge, retry logic with backoff for failed calls, and a reconciliation layer that catches mismatches between your DB and the provider. Clean code, tested, documented.
I currently run this exact pattern in production on a live fintech platform processing real payments 24/7. I know where payment integrations actually break, because I've fixed those breaks myself.
Programming Languages
Python
Coding Expertise
Performance Optimization, Security
What's included
Service Tiers Starter
$500
Standard
$1,200
Advanced
$2,500
Delivery Time 14 days 21 days 30 days
Number of Revisions
235
Design Customization
-
-
-
Content Upload
-
-
-
Responsive Design
-
-
-
Source Code

Frequently asked questions

Serhii M.Status: Offline

About Serhii

Serhii M.Status: Offline
FastAPI Backend Engineer | Payments & Fintech APIs
100% Job Success
Dnipro, Ukraine - 8:36 pm local time
Backend engineer building production fintech systems live payments, multi-tenant SaaS, API integrations that run 24/7.
Currently leading backend on a BNPL platform: FastAPI + PostgreSQL + Redis, processing MTN MoMo payments, Angaza device sync, credit scoring webhooks, React admin dashboard. 300+ tests, Docker/CI/CD, deployed on AWS.

What I build:
- FastAPI backends with async architecture
- Payment integrations (MTN MoMo, PayFast, Stripe)
- Multi-tenant SaaS with RBAC and audit logging
- Background processing pipelines with retry logic
- Docker, AWS deployments, CI/CD infrastructure
- React + TypeScript dashboards

Stack: Python, FastAPI, PostgreSQL, SQLAlchemy, Redis, Docker, AWS, React, TypeScript
I own problems end-to-end - from architecture to deployment. Code that doesn't break at 3 AM.

Keywords: FastAPI developer, payment gateway integration, Stripe integration, MTN MoMo integration, webhook handler, idempotent API design, REST API developer, PostgreSQL backend, multi-tenant SaaS, RBAC, background job processing, Docker deployment, AWS EC2, CI/CD, fintech backend engineer, credit scoring API integration, KYC integration, audit logging

Steps for completing your project

After purchasing the project, send requirements so Serhii can start the project.

Delivery time starts when Serhii receives requirements from you.

Serhii works on your project following the steps below.

Revisions may occur after the delivery date.

Architecture & Integration Review

Review your existing backend, define webhook flow and data model

Core Integration Build

Provider SDK setup, webhook endpoint, signature verification

Review the work, release payment, and leave feedback to Serhii.