For a number of startups over the years, I have been hired to write one thing and ended up writing many others. As the johnny-on-the-spot for several development efforts, I have been fortunate to have written just about every document that a software development effort requires. Name it, and I've probably written it.
Usually, an "I can do that" is a nice surprise for everyone. After I have learned the essentials of the project, writing for the various departments is a matter of repurposing that knowledge into different forms. Written output through a single voice presents a consistent and therefore professional image for the company, which can be a struggle for a small group focused on development. Often, I reserve specific days in the week to work for a client, which improves internal scheduling.
Planning for writing is another benefit that I can provide. Integrated into the planning is an intimate understanding of the time required to write a piece and to then get it approved--and whether it feeds into the development of another.
In addition, I just love the environment. There's something quixotic and captivating about the small team united to accomplish a common challenging goal. In software, if it isn't difficult, it may not be worth doing.
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