If you want to generate more traffic to your company website, you have to put in a lot of effort coming up with at least a good design by yourself. If you do not have natural talents in arts and designing, you could perhaps hire a website designer to do the job for you.
Basically, the importance of having a website designer for your website is that it will greatly help your website to look attractive. Additionally, you could also instruct the designer to make or redesign its visual features so that the outcome would be one that not only pleases you but the site visitors as well.
A website designer doesn't need to worry about SEO (Search Engine Optimisation) as their job is to come up with and design a striking website. If a website needed to be Optimised for the search engines as well as having a attractive design the SEO would be a separate job for an SEO company or individual unless the designer knew how to do SEO as well as website design.
There are actually a lot of roles that a professional website designer could have. Actually, the variety of work that he could accept can also depend on the type of employment he has, whether he is only paid per project or on a long-term basis.
For a contractual designer, his tasks will primarily consist of designing the website and making it look more attractive and appropriate for the type of business that owns it. For example, if a security gadget firm owns that particular website, he may have to incorporate visual elements that signify security like cameras, stun guns, etc.
This description is actually a generalised one. To be more specific, the designer is actually expected to come up with an eye-pleasing integration of interface, buttons, background, icon design. In fact, he is expected to make a good combination of all website variables and make it appear as a single unit.
For a long-term website designer however, job descriptions may slightly vary. The good thing is that if you are a web designer for a certain company, you are expected to do the jobs of contractual designers plus other added tasks.
Since they hired you for long-term, they must be expecting you to maintain the current integrity of their website design. Along with that, you should also be able to improve (not worsen) the current design that the website has.
In some companies, they may ask their designers to update and change the design of their site from time to time so that the website visitors get to see some variations and the search engines see some activity. Web administrators may also ask their web designers to change the design of their pages per season. Say, it is Christmas season so the designer would have to make the visitors feel as if it is really Christmas when they visit your web page.
Changing the theme of a website can sometimes be a problem for the website designer as they may not have set up the website to be updated easily and may be expensive for these changes.
That's why it's important to have an agreement on what changes will be made to the website before the website designer begins working on it.