Your development background will be very useful in a QA / Test Engineer role, assuming you are considering joining a technically competent organization.
I say this because many companies have an antiquated view of "testers" as low skilled keyboard jockeys able to bang keys and input fields like monkeys on ritalin. Avoid these places like the plague...
A premium QA/Test Engineer will apply development and other solid technical skills to:
- Provision test systems spanning wide varies of operating systems, network configuration, applications and settings, in short: be able to build everything you need to test the systems tasked of you.
- Obtain a deeper understanding of the system under test; able to dig into code to discern logical errors and oversights, triage down to root cause and even suggest a fix/patch.
- Integrate test automation technologies into the software process so regression and performance testing is part of a continuous integration & test lifecycle. Manual testing should only be a part of your efforts, as software systems continually expand in scope and a manual-only test process will eventually be overwhelmed by progress.
- Extend and apply third party tools, ranging from code performance analyzers to network traffic capture/replay, code coverage analysis and unit test frameworks, fuzzers and chaos monkeys, etc.
- Understand security risks and defensive coding techniques to identify deficiencies in a code base or implementation/design which introduce vulnerabilities. Catching these defects before a product goes live is very rewarding and can be exceptionally cost effective.
- Develop internal tools or customize existing software using Shell, PERL, Python, Ruby, Java, C/C++, and other languages as required or appropriate for the task at hand.
- Communicate effectively with multiple stake holders in an organization: development, product support, marketing, administration, operations. These will all be interfacing with you and the ability to tailor the technical depth and nomenclature of your written and oral communications to each of these groups is critical to being an effective QA/Test Engineer.
And many other skills and capabilities I've not listed, depending on the context of your role in the group and the domain of the organization you work for.
Many people still consider QA a less important or prestigious occupation compared to other technical professions, like software development. While the prestige may be lacking, the job satisfaction of a competent QA/Test Engineer who applies development, operations, and security analysis skills to improve a product is significant.
The many varied resources you should incorporate into your tester toolbox is too long to list here. Many sites exist devoted to QA toolsmith / test automation / security analysis roles, and you're going to want some skills and tools from all of these specialties at your disposal.
Good luck! I hope you consider the switch; the world needs more competent QA/Test Engineers.