The Upwork Android SDK by Upwork allows implementation of freelance search features in Java language. Formerly known as eLance, Upwork provides an API with integration of users, jobs, companies, contracts, payments, and reports features.
Two months ago I was looking for a side project to spend my time on keeping the saw sharp. I noticed there was no central place to find jobs related to my favorite technology: APIs. There were a lot of API-focused companies out there looking to hire, and a lot of companies looking to hire people specifically to work on API integrations, but no central place to connect employers with candidates that shared their passion for all things HTTP. I found a suitable domain and two months later, API Jobs was born.
The SOAP-based Field Nation API allows your app to do a range of activities possible on the site, from finding technicians to monitoring work in progress. Field Nation covers a wide range of areas of expertise, from health care to computers to helping individuals install home entertainment systems.