How do you approach budget allocation across paid channels?

Budget allocation starts with the objective. If the goal is new customer acquisition at a target cost per acquisition, I start by looking at historical performance data to understand the cost per acquisition, conversion rate, and incremental reach of each channel. Channels that have already proven themselves at scale get the baseline budget. Incremental budget gets allocated to the channels with the highest expected return on marginal spend and to test-and-learn experiments in channels I have not fully validated yet. I typically keep 10-15% of the total budget for testing so that I always have a pipeline of new channels and creative approaches being validated. I review allocation monthly and reallocate based on trailing performance, but I am careful not to cut a channel too quickly: some channels like SEO-retargeting or YouTube have longer conversion windows and look inefficient on a short lookback window. I also factor in seasonality and plan for periods where certain channels will be more or less competitive.

How do you think about attribution and what attribution model do you use?

Attribution is one of the most contested topics in performance marketing because no single model is objectively correct. I start by understanding what decision the attribution model needs to inform. For short-cycle B2C purchases, last-click attribution is often a reasonable proxy for channel efficiency because the conversion window is short and users typically click through one channel. For longer-cycle high-consideration purchases, last-click systematically undervalues upper-funnel channels and I use data-driven attribution if the volume is sufficient, or a time-decay model if not. I also run incrementality tests on my top two or three channels annually, because model-based attribution is still an approximation. An incrementality test tells me whether a channel is actually generating new conversions or merely capturing users who would have converted anyway. My view is that attribution data should inform budget direction, not dictate it with false precision.

How do you manage and optimise a Google Ads account at scale?

Managing Google Ads at scale requires clear account structure, bidding strategy discipline, and a systematic review cadence. On account structure, I organise campaigns by objective and audience type rather than by product catalogue, because it makes budget control cleaner and bid strategies more effective. I use Performance Max where appropriate but always pair it with asset group reporting and negative keyword exclusions, because PMax without constraints tends to concentrate spend on brand terms and retargeting, which inflates ROAS without generating incremental conversions. On bidding strategy, I use Target CPA or Target ROAS for campaigns with sufficient conversion volume and manual CPC for lower-volume campaigns where smart bidding has insufficient signal. My weekly optimisation routine includes search term report review, bid adjustment review by device and audience, asset performance scoring, and quality score monitoring.

How do you measure and report on performance marketing results to senior stakeholders?

I report to senior stakeholders in business outcomes, not platform metrics. Platform metrics like impressions, CTR, and even ROAS are useful for optimisation but they do not answer the question senior leadership cares about, which is: what did we get for our marketing spend? I build a reporting framework that ties paid media spend to pipeline or revenue, showing cost per qualified lead or cost per acquisition, average order value or contract value, and estimated payback period. I present a blended view across channels alongside channel-level breakdowns so that stakeholders can see both the portfolio picture and where individual channels are over- or under-performing. I also show trend lines, not just point-in-time snapshots. I proactively flag risks: if a channel is generating volume but the payback period is extending, I call that out before it becomes a problem.

Tell me about a time a campaign significantly underperformed. How did you diagnose and fix it?

A Google Ads campaign I managed dropped in conversion rate by 35% over three weeks in the middle of a product launch. The first thing I did was eliminate the most obvious causes: landing page was live and loading correctly, there were no billing issues, ad status was active, and the account was not flagged for policy issues. I then looked at the traffic quality: CTR was stable, so the ads themselves had not changed in appeal. But the conversion rate on the landing page was down, which pointed to either the page or the audience. I ran a heatmap review and found that a new hero section added during the launch had pushed the primary CTA below the fold on mobile, where 68% of our traffic was coming from. I worked with the design team to restore the CTA position and added a second inline CTA in the hero section. Conversion rate recovered to within 5% of baseline within 48 hours.

Describe a time you had to make a difficult budget decision with incomplete information.

Midway through a quarter, the platform attribution data was disrupted by an iOS privacy update that reduced the reported conversion volume in Meta Ads by approximately 40%. I had to decide within 48 hours whether to cut the Meta budget, maintain it, or increase it. The data I had available was: reported ROAS had dropped from 3.8 to 2.3, total revenue was actually up 8% week on week, and the drop in reported conversions coincided exactly with the iOS update rollout. My read was that Meta was still driving conversions that were no longer being attributed due to the tracking change. I built a case using revenue trend data and a comparison against organic traffic (which was flat) to argue that the conversion volume was real but the attribution was broken. Management agreed to maintain budget while I implemented server-side tracking. Reported ROAS recovered to 3.2 over the following three weeks.

Give me an example of how you have used creative testing to improve campaign performance.

On a Meta Ads campaign for a subscription service, creative fatigue was depressing performance every six to eight weeks. I set up a structured creative testing framework rather than running ad hoc tests. Each testing cycle had one primary variable (hook, visual format, value proposition, or CTA), with all other elements held constant. I ran each test for a minimum of seven days and required a minimum of 50 conversions per variant before calling a winner. Over three testing cycles I identified that video hooks showing the product in use in the first three seconds outperformed static images by 34% on click-to-install rate, and that a value proposition focused on time saved outperformed one focused on features by 22% on conversion rate. I documented the winning patterns in a creative brief template that the design team used for all subsequent creative production. Average CPM dropped 18% and acquisition cost fell 26% over the six months that followed.

How do you approach conversion tracking setup and what tools do you use?

Conversion tracking setup is the foundation of performance marketing. Getting it wrong means every optimisation decision that follows is based on bad data. I start by defining the conversion events that matter: what user actions correspond to business value? I implement conversion tracking at two levels: client-side via Google Tag Manager for the standard events, and server-side via a conversion API or server-side tagging container for the revenue-critical events. Server-side implementation improves match rates significantly, particularly for Meta where iOS has reduced client-side signal. I use the same event schema across Google Ads, Meta, and any other paid platform so that I am comparing like-for-like when I look at cross-channel attribution. I also implement de-duplication logic when running both client-side and server-side tracking on the same event to avoid double-counting conversions. I audit conversion tracking quarterly to catch drift from site changes that can silently break tracking.

How do you use audience segmentation in paid media?

Audience segmentation in paid media serves two purposes: improving targeting precision and enabling creative personalisation. My segmentation approach starts with first-party data. I segment existing customers by product category, lifetime value band, and recency, and use those segments to build lookalike audiences for acquisition. For retargeting, I build segments by funnel stage: users who visited the product page but did not start a trial get a different message than users who started a trial but did not convert to paid. The creative and value proposition for each segment is tailored to where they dropped off and what objection they are most likely to have at that stage. I use exclusion audiences as carefully as inclusion audiences: I exclude recent purchasers from acquisition campaigns to avoid wasting budget on users who have already converted, and I exclude users who have been through the full retargeting sequence without converting to avoid frequency-induced negative brand association.

How do you approach landing page optimisation as a performance marketer?

As a performance marketer I treat the landing page as part of the campaign, not as a separate responsibility that belongs to another team. My approach starts with alignment: the landing page message, offer, and visual should directly match the ad that delivered the user to it. Message match between ad and landing page is one of the strongest single factors in conversion rate, and it is one of the most commonly broken links in performance marketing. I run landing page A/B tests with a minimum sample size calculated before the test starts and a primary metric defined in advance. Tests I run most often are: hero headline, CTA button text and placement, social proof placement and type, and form length. I also pay close attention to page speed, because even a one-second improvement in load time can have a measurable impact on conversion rate on mobile. I share landing page test results with the campaign team so that winning messages can be fed back into ad copy testing.

Performance Marketing Manager

Performance Marketing Manager interviews tend to go deep on attribution fairly quickly, because that's where the thinking separates. Beyond that, interviewers want to see that you can manage budgets under pressure, work across channels without losing sight of what actually drives revenue, and translate performance data into decisions the wider business finds credible. This guide covers the questions that come up most often and what strong answers look like.

For general interview preparation tips, read our guide to common interview questions.

Prepare further

How to ace the behavioural interview (STAR method)How to answer competency-based interview questions

Common Performance Marketing Manager Interview Questions

Behavioural Interview Questions for Performance Marketing Manager Roles

Technical Questions for Performance Marketing Manager Candidates

What Hiring Managers Look for in Performance Marketing Manager Interviews

What hiring managers really look for in Performance Marketing Manager candidates:

Attribution literacy that's current. The post-iOS landscape has broken most standard attribution models, and candidates who can't explain the difference between model-based attribution and incrementality testing, and why the distinction matters, will make poor budget decisions based on misleading data.
Technical tracking depth beyond Tag Manager. Candidates who've only worked with client-side tracking will struggle when server-side implementation becomes necessary, which it usually does at scale. Ask specifically about Conversion API setup, de-duplication, and what happens to reported ROAS when tracking degrades.
Revenue orientation, not just channel metrics. Performance marketers who can discuss ROAS and CTR but can't translate those into revenue, payback period, or LTV are optimising the wrong thing. It's worth asking every candidate to walk through how they'd report to a CFO, not just to a marketing director.
A systematic approach to creative. The best performance marketers treat creative as a variable to test rather than a deliverable owned entirely by the creative team, and specific examples of how they've structured creative tests reveal a lot about how they think.
Scepticism about platform-reported data. Candidates who take every platform's self-reported attribution number at face value risk being misled by optimistic data, and the ones worth hiring describe running their own validation against business outcomes to check whether the numbers hold up.

Questions to Ask Your Interviewer

→What does the current attribution model look like and has the team run any incrementality tests to validate it?
→How is the paid media budget set and what is the process for reallocating budget between channels mid-quarter?
→What is the relationship between performance marketing and the creative or brand team, and who owns the brief process for paid creative?
→What does the data infrastructure look like and what analytics tools does the team use for reporting and optimisation?
→What are the primary channels in the current mix and which ones have the most headroom for improvement?

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