⟩ In most companies hiring managers make decisions about how to allocate their budgets. Generally HR representatives are messengers who report your past salary, salary requirements etc to the hiring manager. In some organizations the HR manager negotiates on behalf of the hiring manager. Find out that makes the final decision about salary and perks and, if possible, deal directly with that person.
Type of company (small private company, company with VC money, large corporation, public sector)
Large companies may have more money but they usually have more policies, procedures, and bureaucracy. In many large companies hiring mangers may not have a lot of latitude to offer larger salaries to new hires. In small companies there may be more latitude but they may have fewer resources. If you think your skill set is worthy of a large salary making a case for that during the hiring process. Make sure your resume sells your unique accomplishments and skills (back this information up with metrics when possible) and be sure to discuss those things when you interview.
