Book Keeping/Accounting saas application development

Description

I seek an experienced software developer to complete development of a web-based accounting and bookkeeping application, and build a complementary mobile interface. This software-as-a-service application is partially developed, and requires integration and testing of remaining features to achieve a full-featured, stable product.
The ideal candidate will have extensive experience designing and coding financial software applications. Proficiency with web technologies like HTML, CSS, JavaScript and familiarity with platforms like React or Angular is essential for the web portion. Additional skills such as experience building responsive mobile interfaces using technologies like React Native, Ionic or comparable frameworks would prove valuable for the mobile app development.
Once selected, I will provide the existing codebase and project documentation for the developer to analyze. System functionality includes account management, invoice processing, expenses, reporting and other core accounting functions. Remaining tasks involve implementing the outstanding features, integrating third party APIs as needed, addressing bugs and ensuring a smooth user experience across all interfaces. The candidate should also plan to conduct thorough testing and provide documentation.
Security, scalability and compatibility with common web browsers and mobile OS are priorities. The finished product will be deployed as a cloud-based SaaS allowing users to access their accounts from any device. Professionalism, communication and meeting deadlines are critical as I aim to launch the application soon. Candidates with a proven track record of successful past projects are strongly preferre