"I improved ROAS."
That's a good start in a PPC job interview.
But it's probably not enough.
An interviewer is likely to want to know:
By how much?
Over what period?
What did you actually change?
What happened to spend and revenue?
Was the improvement profitable for the business?
And how do you know your actions contributed to the result?
This is where strong PPC candidates can separate themselves from people who simply know how to operate Google Ads.
Employers aren't only interested in whether you can improve campaign metrics.
They want to understand whether you can use paid search to create meaningful commercial impact.
Here's how to demonstrate that in your next PPC interview.
Understand What ROAS Actually Tells You
ROAS stands for Return on Ad Spend.
At its simplest:
ROAS = Revenue Generated ÷ Advertising Spend
If a campaign spends £10,000 and generates £50,000 in attributed revenue:
ROAS = 5
or:
500%
That means the campaign generated £5 in attributed revenue for every £1 spent on advertising.
Simple enough.
But a strong PPC candidate understands that this number doesn't tell the whole story.
Don't Treat ROAS as Profit
A 5x ROAS sounds excellent.
But is it?
That depends on the business.
Imagine two companies each generate £50,000 in revenue from £10,000 in advertising spend.
Company A has extremely high margins.
Company B sells products with very low margins.
The same ROAS can produce very different commercial outcomes.
Costs such as:
- Cost of goods
- Delivery
- Discounts
- Payment processing
- Sales commissions
- Returns
- Agency fees
- Operational costs
can all affect profitability.
You don't necessarily need access to every financial detail.
But demonstrating that you understand the difference between revenue and profit can immediately make your answer more commercially credible.
Know the Numbers Behind Your Best Examples
Don't walk into an interview knowing only that a campaign "performed well".
Prepare the numbers beforehand.
For your strongest PPC examples, try to know:
- Approximate spend
- Revenue
- ROAS
- CPA
- Conversion volume
- Conversion rate
- Time period
- Percentage improvement
For example:
"The account was spending approximately £40,000 per month at a 3.2 ROAS. Over the following four months, we increased spend to around £55,000 while improving ROAS to 4.1."
That's much stronger than:
"I successfully scaled the account and improved ROAS."
Specificity builds credibility.
Put Your Results in Context
Saying:
"ROAS increased by 30%."
sounds impressive.
But the interviewer still doesn't know very much.
Perhaps you reduced spend from £100,000 to £10,000 and kept only the highest-performing brand campaign running.
ROAS may have increased dramatically.
The business may have generated considerably less revenue.
That's why context matters.
A stronger answer might be:
"We increased ROAS from 3.4 to 4.2 over six months while increasing monthly spend by approximately 25%, so the improvement wasn't simply caused by cutting lower-performing activity."
Now you're demonstrating both efficiency and growth.
Talk About Scale and Efficiency Together
One of the most useful commercial concepts to understand in PPC is the relationship between scale and efficiency.
Businesses often want both.
They want:
More conversions.
And:
A lower CPA.
Or:
More revenue.
And:
A higher ROAS.
Sometimes that's possible.
Sometimes increasing volume requires accepting slightly lower efficiency.
Imagine Campaign A generates:
£20,000 revenue from £4,000 spend = 5x ROAS
Campaign B generates:
£100,000 revenue from £25,000 spend = 4x ROAS
Which campaign is better?
There isn't enough information to say.
Campaign A is more efficient.
Campaign B generates considerably more revenue.
A commercially minded PPC professional understands that the correct answer depends on the company's margins, growth objectives, capacity, and profitability targets.
Explain the Starting Problem
The best interview examples have a clear problem.
For example:
"The ecommerce account had maintained a ROAS of around 4.5, but growth had stalled because campaigns were heavily concentrated around existing brand demand."
Now the interviewer understands the challenge.
The goal wasn't simply:
Improve ROAS.
It was:
Find additional growth without allowing efficiency to decline beyond an acceptable level.
That's a much more realistic PPC problem.
Explain What You Personally Did
This part matters enormously.
If you say:
"We increased revenue by 40%."
the interviewer may wonder what we means.
Did you develop the strategy?
Did you build the campaigns?
Did you analyse the data?
Did your Manager make the decisions while you implemented them?
Did another agency manage half the account?
Be specific.
For example:
"I was responsible for the Google Ads account and developed the budget reallocation strategy. I identified that several non-brand Shopping campaigns were maintaining profitable returns despite being budget constrained, so I recommended moving additional investment into those areas."
That makes your contribution clear without taking credit for work you didn't do.
Explain Why You Made the Decision
Employers don't only want to hear what you changed.
They want to understand your reasoning.
Imagine you say:
"I moved the account to Target ROAS bidding."
Why?
A stronger explanation might be:
"The account had enough conversion volume and reliable revenue tracking, and the business had a clear profitability target. That made value-based bidding more appropriate than optimising purely towards conversion volume."
Now you're demonstrating judgement rather than simply platform knowledge.
Connect Optimisations to Business Outcomes
Try to avoid presenting PPC actions as achievements on their own.
For example:
"I added 200 negative keywords."
That's an action.
What happened because of it?
Perhaps:
"Search-term analysis showed a significant amount of spend going towards informational queries that rarely converted. Tightening that traffic reduced wasted spend and allowed more budget to move towards higher-intent searches, contributing to a 17% improvement in CPA."
The negative keywords aren't the achievement.
The commercial impact is.
Use a Simple Interview Structure
When discussing a PPC success story, a simple framework can keep your answer focused.
1. Situation
What was happening?
2. Objective
What did the business need?
3. Action
What did you do?
4. Result
What changed?
5. Commercial Impact
Why did that result matter to the business?
For example:
Situation: ROAS had fallen from 4.0 to 3.1 while spend remained relatively stable.
Objective: Restore efficiency without significantly reducing revenue.
Action: Reviewed product-level profitability, restructured Shopping activity, improved feed segmentation, and moved budget away from low-margin categories.
Result: ROAS increased to 3.9 over the following three months.
Commercial Impact: Revenue remained broadly stable despite lower spend on less profitable products, improving the overall efficiency of the account.
That gives the interviewer a complete story.
Talk About Revenue, Not Just ROAS
If you're interviewing for ecommerce PPC roles, employers will often care about revenue growth as well as efficiency.
Instead of:
"ROAS increased from 3 to 4."
you might say:
"ROAS increased from 3 to 4 while monthly revenue grew from approximately £90,000 to £125,000."
That provides a much clearer picture of the scale of the result.
Again, make sure you're only sharing figures you're permitted to disclose.
If necessary, use percentages or anonymised figures.
For Lead Generation, ROAS May Not Be the Best Metric
Not every PPC role is ecommerce.
If you're managing lead generation, you may not have immediate revenue data inside Google Ads.
That doesn't mean you can't demonstrate commercial impact.
You might discuss:
- Cost per lead
- Cost per qualified lead
- Lead-to-sale conversion rate
- Cost per acquisition
- Pipeline value
- Revenue from PPC leads
- Lead quality
For example:
"We reduced cost per lead by 20%, but more importantly, integrating CRM data showed that the new campaigns were generating a higher proportion of qualified leads. Cost per qualified lead fell by 31%."
That's considerably more commercially meaningful than focusing only on form submissions.
Show That You Care About Lead Quality
Imagine you reduce CPL from £50 to £25.
Fantastic.
But Sales tells you the new leads are terrible.
Have you improved performance?
Probably not.
Strong PPC candidates understand the difference between generating more leads and generating more customers.
If you've worked with sales or CRM data, mention it.
You might say:
"Initially, Google Ads performance looked strong because CPL had fallen. However, when we reviewed CRM data, we found the cheaper leads were converting into customers at a much lower rate. We therefore changed the conversion signals being fed back into Google Ads to prioritise qualified opportunities rather than all form submissions."
That's an excellent example of commercial thinking.
Demonstrate That You Understand Profitability
If you have access to margin data, talk about it.
Perhaps one product category generated a 6x ROAS while another generated 4x.
The obvious decision might seem to be putting more budget into the 6x category.
But what if the second category has considerably higher margins?
Revenue-based ROAS doesn't capture that difference.
Even if you've never worked with profit-based bidding, showing awareness of these limitations demonstrates that you understand PPC beyond the dashboard.
Talk About Customer Lifetime Value
Some businesses can afford to acquire customers at a relatively high initial cost because those customers purchase repeatedly.
Imagine:
Customer A costs £80 to acquire and spends £100 once.
Customer B costs £120 to acquire but spends £600 over two years.
If you're only looking at the first purchase, Customer A may appear more attractive.
Understanding customer lifetime value can influence how aggressively a business should acquire different types of customers.
If you've used lifetime value or repeat-purchase data in PPC strategy, it's worth discussing.
Mention Budget Responsibility
Employers want to understand the scale of responsibility you've handled.
If appropriate, mention the budgets you've managed.
For example:
"I was responsible for approximately £75,000 in monthly Google Ads spend across Search, Shopping, and Performance Max."
Budget size isn't everything.
Someone managing £10,000 extremely well can be more capable than somebody who happened to have access to a £500,000 account.
But it helps interviewers understand your experience.
Explain How You Made Budget Decisions
Simply managing a large budget isn't enough.
How did you allocate it?
A strong example might be:
"We had an additional £15,000 available during the seasonal peak. Rather than distributing it evenly, I reviewed marginal ROAS, impression share, product availability, and historical demand to identify where additional spend was most likely to generate incremental revenue."
That demonstrates commercial decision-making.
Don't Hide Trade-Offs
Real PPC performance involves trade-offs.
Talking about them can make your answers more credible.
For example:
"When we increased monthly spend by 40%, ROAS fell from 5.1 to 4.5. However, the client's profitability threshold was 3.8, so the additional volume remained commercially attractive and generated approximately 25% more contribution profit."
The lower ROAS isn't necessarily a failure.
In this situation, accepting slightly lower efficiency allowed the business to generate more profit.
That's exactly the kind of thinking employers want from senior PPC candidates.
Don't Claim Causation Too Easily
Marketing performance is influenced by more than PPC.
Perhaps revenue increased after you restructured the campaigns.
But during the same period:
- The company launched a sale
- Prices changed
- Website conversion rates improved
- Organic traffic increased
- Demand became seasonal
- A competitor left the market
Be careful about saying:
"My campaign changes caused a 50% increase in revenue."
unless you have evidence to support that conclusion.
A more credible explanation might be:
"Revenue increased by 50% during the period. PPC contributed to that growth, although the business was also running a seasonal promotion, so I wouldn't attribute the entire increase to the campaign changes."
That level of honesty can strengthen your answer rather than weaken it.
Be Ready to Explain Attribution
If you're talking about ROAS, attribution may come up.
Be prepared to discuss how your organisation measured performance.
For example:
- Google Ads attribution
- GA4
- CRM data
- Ecommerce platform data
- First-party reporting
- Data-driven attribution
You don't need to solve the entire attribution problem during the interview.
But demonstrate that you understand platform-reported revenue isn't necessarily the absolute truth.
Prepare One Example Where Performance Wasn't Great
Not every commercial impact story needs to end with record-breaking ROAS.
Perhaps you launched into a new market and performance was weaker than expected.
What did you do?
Maybe you identified that CPCs were considerably higher than forecast.
Perhaps conversion rates were lower.
Maybe the offer wasn't competitive.
Explain how you diagnosed the problem and what you recommended.
Employers value people who make sensible decisions when campaigns aren't working.
Explain When You Would Reduce Spend
PPC professionals sometimes feel they need to demonstrate constant growth.
But good commercial judgement can also mean recommending less advertising spend.
If a campaign has reached the point where additional investment produces unprofitable customers, increasing the budget simply to hit a spending target doesn't make sense.
Being willing to say:
"I recommended reducing spend because the marginal return no longer met the client's profitability threshold."
can demonstrate genuine commercial maturity.
Adapt Your Examples to the Seniority of the Role
For a PPC Executive position, employers may primarily want evidence that you understand campaign performance and can explain the impact of your optimisations.
For a PPC Manager role, expect greater focus on:
- Budget ownership
- Strategy
- Forecasting
- Commercial targets
- Client communication
- Scaling
For Head of PPC or senior leadership roles, you may need to discuss:
- Profitability
- Portfolio-level investment
- Incrementality
- Forecasting
- Team performance
- Cross-channel strategy
- Business growth
The more senior the position, the further your answers should move beyond Google Ads metrics.
Build a Bank of Commercial Examples
Before the interview, prepare several examples you can adapt to different questions.
Ideally, have stories covering:
- Improving ROAS
- Scaling spend
- Reducing CPA
- Improving lead quality
- Solving a performance decline
- Reallocating budget
- A failed test
- A tracking problem
- A commercial recommendation
You don't need ten-minute answers for each.
You simply need enough detail to explain the situation confidently.
What If You Can't Share Exact Figures?
Client confidentiality matters.
You can still demonstrate impact.
Use percentages.
For example:
"Monthly spend increased by approximately 35% while ROAS improved by 18%."
Or anonymise the numbers:
"The account was spending in the mid-five figures per month."
You can also say:
"I can't disclose the client's exact revenue, but paid search revenue increased by approximately 27% year on year."
A good employer will understand.
Protecting confidential information can actually demonstrate professionalism.
What Employers Really Want to Hear
Ultimately, employers aren't looking for somebody who can simply say:
"I achieved a 6x ROAS."
They want to understand whether you know:
Why it happened.
Whether it was actually good.
What you did to influence it.
How it affected the business.
What trade-offs were involved.
What you would do next.
That's the difference between reporting a PPC metric and demonstrating commercial impact.
The Bottom Line
ROAS is useful.
But don't make it the entire story.
In a PPC job interview, the strongest candidates connect campaign performance to revenue, profitability, customer acquisition, lead quality, and business growth.
So instead of saying:
"I improved ROAS."
Tell the interviewer:
What the problem was.
What the business needed.
What you identified.
What you changed.
Why you changed it.
What happened.
And why that result mattered commercially.
That's what turns a Google Ads success story into evidence that you understand PPC as a business investment.
And that's much closer to what employers are actually hiring for.
If you're ready to demonstrate your commercial impact in your next role, explore the latest PPC and Paid Media opportunities at Paid Media Jobs UK.