HR GLOSSARY · Core HR

Job description

Also known as: JD, Position description, Role description, Job spec

A job description is a written summary of a role's purpose, responsibilities, required skills, reporting relationships, and qualifications. Used for recruiting (in job postings), performance management (defining what good looks like), compensation (mapping to pay bands), and legal compliance (defining essential job functions for ADA and FLSA purposes).

Job descriptions sit at the center of the employment lifecycle: written before a hire, used to attract candidates, referenced in interviews, embedded in offer letters, used to set expectations on day one, anchored in performance reviews, and often relied on years later in legal disputes. A good JD is specific enough that two managers reading it would agree on what success looks like; a bad JD is a list of bullet points that could describe any role at any company.

Components of a strong job description

Job title — clear, market-aligned (avoid invented internal titles for external-facing JDs)
Purpose — one sentence on why this role exists
Reporting line — who this role reports to, who reports to this role
Essential functions — the work that must be done (used for ADA reasonable accommodation analysis)
Responsibilities — concrete tasks and outcomes (4-8 bullets, ranked by importance)
Required qualifications — education, experience, certifications, skills (separate "must-have" from "nice-to-have")
Working conditions — location, travel, physical requirements, schedule
Compensation range — required in many US states and EU under Pay Transparency Directive

Essential vs marginal functions (ADA implication)

For US compliance, distinguish essential functions (work the position exists to perform; failure to perform would substantially impact the role's purpose) from marginal functions (tasks that could be reassigned without impact). This distinction is the foundation of ADA reasonable accommodation analysis — an employer must accommodate disability that prevents marginal functions, but not necessarily essential ones. Document this distinction explicitly in the JD.

Common JD mistakes

Bullet inflation — 20 vague bullets instead of 6 specific ones
Skill stuffing — listing every imaginable skill instead of the 5 actually needed
Title inflation — "Ninja", "Rockstar", "Guru" titles that don't map to market and complicate compensation benchmarking
Qualification creep — requiring degree + 5 years for roles where 2-3 would suffice; narrows pipeline
Mission-statement substitution — describing company values instead of the role
No comp range — increasingly illegal in US states and EU; broadly off-putting to top candidates anyway

Frequently asked questions

What is a job description?

A written summary of a role's purpose, responsibilities, required skills, reporting relationships, and qualifications. Used for recruiting, performance management, compensation mapping, and legal compliance.

How long should a job description be?

Long enough to be specific, short enough to read. Typically 250-500 words for individual contributor roles, 400-700 for senior or manager roles. If it's longer than one screen, it's probably bloated.

What are essential functions on a JD?

Work the position exists to perform — duties whose elimination would substantively change the role. For US ADA compliance, distinguishing essential from marginal functions is critical for reasonable accommodation analysis.

Do I have to include salary in a job description?

Increasingly yes. Several US states (California, New York, Colorado, Washington, Illinois) require salary ranges in postings. The EU Pay Transparency Directive (effective June 2026) requires salary ranges before first interview or in the post.