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I will develop a go backend API with payment integration
Donggeon L
About this gig
Need a Go backend built, fixed, or connected to a payment provider? I deliver working code you can run.
What you get:
- A Go REST API module or backend service built to your spec
- Payment integration with Stripe, PayPal, or Authorize.Net, including webhooks and subscription billing
- Bug fixes and code review for an existing Go or Python backend
- Docker deployment setup and Python automation scripts
Selected work:
- PHP monolith to Go microservices on Kubernetes, with a BFF layer
- Go event registration and payment (Pelecard) services with Keycloak
- Cross-chain token bridge with order state machine and retries
- Live-stream chat push with Redis Pub/Sub and SSE
- Stripe and PayPal billing on a 40+ service platform, and Authorize.Net and Heartland parking citation payments
How it works:
1. Message me with your goal, current stack, and API documentation or data model.
2. I confirm the scope and recommend the right package.
3. I deliver the source code, and revisions are included in every package.
About me: Go backend engineer with 15+ years of experience, 8 in Go, and 6 years working remotely with teams in the US, Sweden, Israel, and China.
Get to know Donggeon L
Donggeon L
Senior Go, golang Backend Engineer, Payments and Blockchain
- FromSouth Korea
- Member sinceAug 2018
Languages
English, Korean
Senior Backend Engineer (Go(golang), Python) with 15+ years of experience, 8 in Go. I build payment systems (card payments, subscription billing, on-chain USDC) and blockchain services on Ethereum, Hyperledger Fabric, and Cosmos SDK, from backend design to mainnet launch.
Stack: Go(golang), Python, Node.js, gRPC, Kubernetes, AWS, GCP, MySQL, ClickHouse, Stripe, PayPal, Authorize.Net, Solidity.
6 years of remote work with teams in the US, Sweden, Israel, and China. Message me before ordering to discuss your project.
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FAQ
Can you work on my existing codebase?
Yes. I can fix bugs in or review an existing Go or Python backend. Please message me before ordering so we can agree on access and scope.
Which payment providers do you support?
I have built integrations with Stripe, PayPal, Authorize.Net, Heartland, and Pelecard, including webhooks and subscription billing. Other providers with a documented API can be integrated too. Message me with the provider name and I will confirm before you order.
What do you need from me to get started?
Your project goal, current stack, API documentation or data model, and test credentials for the payment provider if relevant.
Do you build frontends?
This Gig focuses on the backend. If you need a simple frontend for your API or payment integration, message me and I will confirm scope before you order.
