English to Spanish translator with excellent Spanish Grammar and Proofreading Skills

Looking for an expert English to Spanish translator with excellent Spanish grammar and proofreading skills. The idea for this project is to work together over the next months so that I can release some short e-books in Spanish.

Must have experience working on interesting translation projects.

Main skills are: English to Spanish translation, great Spanish grammar so that the texts read as though it was written originally by a Native Spanish speaker, and proofreading.

The rate is fixed per project. $25 USD for 13,000  words or $50 for 26,000-27,000 words translated

Requirements:

-Must be a native Spanish speaker with excellent Spanish writing skills.
-Background as a translator/interpreter.

-No Google translate.
-The translations must be done manually and the texts should read as though they were written originally by a Native Spanish speaker.
-Must be able to proofread work for grammar/syntax/other errors before delivering work.

-Must be professional and able to deliver on time with a quick turnaround.
-Work samples.

Kindly include this paragraph translated to Spanish (this is a requirement):

You’ll often hear the word assertiveness a lot in social and communication skills training. An assertive person is capable of standing up for his rights in a relaxed and positive manner, without resorting to aggressive behaviors or passively accepting what they dislike or what’s wrong. Assertive people can often get their points across without upsetting or offending others, and as a result, they avoid getting upset themselves.

Those that act in an assertive manner tend to value the ideas, emotions, and beliefs of others as their own. Being able to express your wishes, wants, ideas, and desires without undermining others’ rights is an extremely desirable and valuable social skill.