Job description

What it is

A job description is a written summary of a role. It explains why the job exists, what the person will do, what skills and experience they need, and who they report to. It often also lists the location, working pattern and pay range.

A job description is not the same as a job ad. The job ad is a short, marketing-style version used to attract candidates. The job description is the fuller, more stable document HR keeps on file and uses long after the hire is made.

Why it matters

A clear job description helps everyone agree on what the role is before hiring starts. Recruiters know who to look for, candidates know what they are applying for, and managers can compare people against the same list of needs.

It also matters after the hire. A good job description guides employee onboarding, shapes early goals and gives managers a fair basis for reviews. When a role changes over time, an updated description helps with headcount planning and promotions.

Many teams also attach the job description to the new hire's first tasks in their onboarding software, so the person can see from day one what success in the role looks like.

How it works

Most job descriptions follow a similar structure:

• Job title, team, location and reporting line.
• A short summary of the role's purpose, in two or three sentences.
• Main responsibilities, usually five to eight bullet points.
• Required skills, experience and any must-have qualifications.
• Nice-to-have skills, kept separate from the must-haves.
• Working pattern, pay range and key benefits where you share them.

The hiring manager usually drafts it, HR reviews it for clarity and fairness, and the recruiter turns it into a job ad posted through an applicant tracking system.

Example: a 40-person accounting firm needs a new office coordinator. The office manager drafts a job description with six duties, from handling supplies to booking client meetings. HR removes vague phrases like "rock star", splits the skills into required and nice to have, and adds the pay range. After the hire, the same description becomes the base for her 30-60-90 day plan.

Best practices

• Write in plain language and use a job title people actually search for.
• Focus on outcomes, not just a long list of tasks.
• Keep must-have requirements short so you do not scare off good candidates.
• Use inclusive wording and avoid terms that suggest age, gender or other bias.
• Review and update each description at least once a year.

Common mistakes

• Copying an old description that no longer matches the real job.
• Listing too many must-have skills for one role.
• Using internal jargon that candidates do not understand.
• Forgetting to share the description with the new hire during onboarding.

FAQ

What is the difference between a job description and a job posting?

A job description is the internal document that defines the role. A job posting, or job ad, is the public version written to attract applicants. The posting is usually shorter and more promotional.

How long should a job description be?

Most good job descriptions fit on one page, roughly 300 to 700 words. That is enough to explain the role clearly without overwhelming readers.

Who writes a job description?

The hiring manager usually writes the first draft because they know the work best. HR then reviews it for clarity, fairness and consistency with other roles. In some countries certain content is regulated, so this is general information, not legal advice.