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I will integrate any third party API into your java spring boot backend
Asad
About this gig
Third-party API integrations are where projects get stuck. Authentication quirks, underdocumented endpoints, data transformation headaches I've dealt with all of it.
I've integrated payment networks (Visa, Amex), banking APIs (Cross River Bank), and travel services (airlines, hotels, events) into live production systems. If there's an API with documentation, I can integrate it.
What I handle:
- REST / SOAP API integration into existing Java/Spring Boot backends
- OAuth2, API key, HMAC, JWT-based authentication flows
- Data transformation, mapping, and error handling
- Webhook setup and event handling
- Payment gateways, travel APIs, banking/fintech APIs
- Writing integration tests and documentation
Real integrations I've shipped:
- Visa Roam, Visa Stop Payments, Amex Offers live fintech platform
- Airlines, hotels, and events booking ride-hailing super-app
- Cross River Bank API banking platform
Send me your API docs and I'll give you a free assessment of complexity and timeline before you order.
Get to know Asad
Asad
- FromPakistan
- Member sinceFeb 2025
Languages
English
Senior Backend Java Developer | 4+ years in fintech, banking & ride-hailing.
Currently at Jeeny (Middle East ride-hailing app) — integrating airlines, hotels & events into a live super-app backend. Previously at I2C (global fintech), building Kafka microservices, Visa/Amex API integrations & real-time streaming APIs.
Specialties: Spring Boot · REST APIs · Kafka · OAuth2/JWT · Cassandra · MySQL · CVE Security
BSc Computer Science — NUST Islamabad.
Message me before ordering — I respond fast.
Other Software Development Services I Offer
FAQ
What APIs have you integrated before?
Visa Roam, Visa Stop Payments, Amex Offers, Cross River Bank, and airlines/hotels/events booking APIs in production systems.
What if the API has poor documentation?
I've dealt with this before. I'll assess the docs upfront and flag any gaps before we start so there are no surprises.
Can you integrate SOAP APIs, not just REST?
Yes, I have experience with both REST and SOAP integrations in Java.
My API requires a sandbox/test environment — is that a problem?
Not at all. Most third-party APIs have sandbox environments and I always develop and test against sandbox before touching production config.
