You will get a QuickBooks Online or Xero integration for your app
Rising Talent
Project details
I build reliable QuickBooks Online and Xero integrations that keep your invoices, bills, payments, customers, and items in sync - with secure OAuth2, automatic token refresh, webhooks, and reconciliation so the data stays correct. With 8+ years of backend experience in Java/Spring Boot and Node.js, I deliver clean, well-tested code and a clear plan with checkpoints. Whether you need a simple one-way sync or a full two-way integration with error handling and retries, I scope it clearly and keep you updated at every step.
Programming Languages
JavaScript, Python, JavaCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$750
|
Advanced
$1,800
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 21 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
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CG
Chris G.
Apr 27, 2026
Earn $100 right now (Simple vibe coded Python main.py script)
About Samson
Senior Backend Engineer | Java/Spring Boot, Node.js, API Integrations
100%
Job Success
Addis Ababa, Ethiopia - 8:22 pm local time
I build and stabilize reliable backends: clean REST APIs, microservices, and integrations that actually stay in sync. 8+ years of backend experience and 2,700+ hours delivering systems that handle high traffic and financial/inventory workflows.
Where I help most:
- API & platform integrations — QuickBooks Online & Xero (OAuth2, tokens, webhooks, sync, reconciliation), cXML purchase-order flows, and payment/accounting platforms
- Microservices — designed and maintained 32+ services with CI/CD + Docker, improving uptime and cutting deployment time
- Backend rebuilds — refactored legacy systems into scalable services with measurably higher throughput
- Security — JWT, Spring Security, and Auth0 authentication/authorization
- Reliability — async processing with Kafka/SQS, idempotency, retries, and rate limiting, backed by tests (JUnit, Mockito, Testcontainers)
Tech I work with:
Java, Spring Boot, Node.js, NestJS, Python, PostgreSQL, MySQL, MongoDB, MariaDB, Redis, DynamoDB, Docker, Apache Kafka, AWS SQS, REST, gRPC.
How I work:
I start with a short review of your current code/architecture, then give you a clear plan, timeline, and checkpoints — so you always know what's happening and what comes next.
If you're dealing with a fragile backend, a stalled integration, or you need a new API built right the first time, send me a message describing what you're trying to achieve and I'll reply with a concrete next step.
— Samson
Steps for completing your project
After purchasing the project, send requirements so Samson can start the project.
Delivery time starts when Samson receives requirements from you.
Samson works on your project following the steps below.
Revisions may occur after the delivery date.
Build, test, and deploy the integration
Connect to the QuickBooks Online or Xero API with OAuth2, build the sync for your selected records, test against your sandbox, then deploy and hand over with documentation.