How to write a job description that actually works

The document everyone writes in five panicked minutes

Be honest. Nobody ever taught you how to write a job description, so the last one you wrote was probably knocked together at the last minute, half-borrowed from an old one, mostly to stop the recruiter ringing you for the fourth time.

You are in good company. In small businesses, the job description is the document everyone needs and nobody loves. It gets written in a rush, used once to fill a vacancy, then shoved in a drawer until the next time.

Which is a shame, because a good job description quietly does a lot of work for you long after the hire. It tells people what they are actually here to do. It anchors appraisals. It helps you set fair pay. And if a dispute ever lands, it is one of the few bits of paper that proves what the role genuinely required.

So let's write one properly, once, and let it earn its keep. No jargon, no fluff.

Kettle on. Let's make it useful.

Quick Answer Box

• A job description describes the job. A person specification describes the person you need.
• Keep the structure simple: title, purpose, key responsibilities, reporting line, location or pattern.
• Make every "essential" requirement a genuine need of the role, not a wish list.
• Write inclusively. Avoid gender-coded or age-coded language to stay clear of Equality Act 2010 risk.
• A job description is not legally required, but it underpins recruitment, performance, and pay.
• Review it yearly and whenever the role changes.

What a job description actually does for you

It is tempting to see a job description as just a posh job advert. It is much more than that. A well-written one quietly improves four things:

• Clear expectations. Most workplace grumbles start with confused expectations. A document that spells out what the role involves is fair to everyone and heads off a lot of "but I didn't think that was my job."
• Fair pay decisions. You cannot benchmark a salary sensibly if nobody has written down what the role is. A clear job description lets you compare like with like and avoid over-paying or under-paying.
• A backbone for appraisals. Whether you set targets or just talk about direction, the job description is the obvious starting point for "here's what good looks like in this role," and it makes the performance conversations in what great managers say next far easier to ground in fact.
• Protection if things go wrong. A job description is not a legal requirement, but it has real value in evidencing the genuine, objective requirements of a role, which matters if a recruitment or performance decision is ever challenged.

Get it right and the same document supports hiring, managing, paying, and protecting. That is a strong return for a page or two.

Job description versus person specification

This trips up almost everyone, so let's make it clean.

• The job description is about the job. What it is for, what it involves, where it sits.
• The person specification is about the person. The skills, experience, and qualities someone needs to do it well.

They work as a pair. The job description tells a candidate what they would be doing. The person specification tells you, and them, who is likely to do it well, and gives you fair, consistent criteria to assess applicants against.

Keeping them separate matters for fairness too. When your criteria for the person are written down clearly as essential or desirable, you can score every candidate against the same yardstick, which makes your hiring decisions defensible rather than based on a gut feel you cannot explain.

How to structure a job description

Keep it simple and concrete. A clear structure beats a long one every time.

• Job title. Plain and recognisable. "Customer Support Advisor" beats "Customer Happiness Ninja." Clever titles confuse candidates and search engines alike.
• Purpose of the role. One or two sentences on why this job exists and what it is ultimately there to achieve.
• Key responsibilities. A focused list of the main duties, usually five to ten bullets. Use active verbs ("manage", "respond to", "prepare"). Resist listing every tiny task.
• Reporting line. Who they report to, and who, if anyone, reports to them.
• Location and working pattern. Office, hybrid, or remote, and the hours or days.
• A line about scope. Something like "and other reasonable duties in line with the role" stops the description becoming a ceiling, while staying fair.

Then, alongside it, your person specification.

How to write a fair person specification

Split your criteria into two columns:

• Essential. The things someone genuinely must have to do the job from the start.
• Desirable. The nice-to-haves that would make someone stronger but are not deal-breakers.

The discipline here is honesty. Every "essential" item should survive the question, "Could a capable person do this job without it, or learn it quickly?" If the honest answer is yes, it belongs in desirable, or nowhere.

This is not just tidiness. Over-stuffed "essential" lists quietly screen out good people and can stray into discrimination. Demanding a specific qualification, a set number of years, or "recent" experience can indirectly disadvantage groups protected under the Equality Act 2010 unless the requirement is a genuine need of the role.

Writing inclusive, non-discriminatory language

This is where job descriptions can land you in trouble without you meaning any harm. The Equality Act 2010 protects characteristics including age, sex, race, disability, religion or belief, sexual orientation, gender reassignment, marriage and civil partnership, and pregnancy and maternity. Your wording should never imply a preference linked to any of them.

A few practical rules:

• Lose gender-coded words. "Strong", "dominant", "competitive", and "rockstar" skew male; "supportive", "caring", and "nurturing" skew female. Describe the work, not a stereotype.
• Avoid age signals. "Young and energetic", "recent graduate", or "digital native" can amount to age discrimination. So can "mature" at the other end.
• Be careful with "essential" experience. "Must have 10 years' experience" can indirectly disadvantage younger or returning workers. Ask for the skill level, not the years.
• Mind physical and availability requirements. Only include things like lifting, driving, or specific hours if the role genuinely needs them, and be open to reasonable adjustments for disabled candidates.
• Drop "culture fit" as a vague criterion. It invites bias. Be specific about the behaviours or values you actually mean.

For a fuller checklist of inclusive wording, ACAS guidance on writing a job and person specification is a sensible reference.

Keep it current

A job description written once and never touched becomes misleading. Roles drift. Responsibilities move around. Set a simple habit:

• Review every job description at least once a year, ideally alongside appraisals.
• Update it whenever the role meaningfully changes.
• Check it still reflects reality before you re-advertise the role.

A current job description keeps appraisals honest, makes pay reviews fair, and is far more useful than a fossil if you ever need to restructure or defend a decision.

What to write down

For each role, keep a single, current document that captures:

• Job title and purpose
• Key responsibilities and reporting line
• Location and working pattern
• The person specification, split into essential and desirable
• The date last reviewed, so you know when it is going stale

Store it where managers can actually find it, not buried in one person's inbox.

Common mistakes to avoid

• Treating the job description as just an advert and binning it after the hire.
• Confusing the job description with the person specification, then assessing candidates against vague gut feel.
• A wish-list of "essential" criteria that no real human meets, which slows hiring and screens out good people.
• Gender-coded or age-coded language that creates Equality Act risk.
• Cute job titles that nobody searches for and candidates do not understand.
• Letting it go years out of date, then leaning on it in an appraisal or dispute.

A simple template you can copy

> Job title: [Plain, recognisable title]

>

> Reports to: [Manager's role]

>

> Location / pattern: [Office, hybrid, or remote; hours or days]

>

> Purpose of the role: [One or two sentences on why this job exists and what it achieves.]

>

> Key responsibilities:

>

> - [Active verb + task]

> - [Active verb + task]

> - [Active verb + task]

> - And other reasonable duties in line with the role.

>

> Person specification:

>

> - Essential: [genuine must-haves]

> - Desirable: [nice-to-haves]

>

> Last reviewed: [date]

Fill that in honestly and you have a document that pulls its weight across hiring, managing, and paying.

When to get help

A clear job description is the foundation of fair hiring, sensible pay, and confident performance conversations. If yours are out of date, inconsistent across the team, or you are worried the wording could trip an Equality Act problem, it is worth a fresh pair of eyes.

An HR Health Check will tell you whether your job descriptions, recruitment, and documentation hold together or leave gaps. Our HR Advice Line can sense-check a specific job description before you advertise, and HR Excel gives growing teams the documents and templates to do this consistently. Or just book a discovery call and we will help you get your roles written down properly.

A job description is not red tape. Done well, it is one of the most useful pages in your business.

Kettle on. Standards up. And until next time, take care of your people.