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Practice-only question bank bank-v1 (2026-10-14): prompts remain DRAFT and are available for personal learning, not represented as reviewed or approved interview content.
Practising for the listing Senior Business Engineer - Ads. Its requirements are filled in below. When you have an answer you like, paste it with your CV in Career Mirror to see which of the job's skills it shows.
Requirements found
Sales (nice) Marketing Onboarding Python (must) Javascript (must) Scheduling
What this posting asks for
Level: Senior — The title says "Senior".
Main responsibilities
- Act as a trusted technical advisor and solutions architect for strategic partners (or direct advertisers), guiding them through the integration and adoption …
- Design and prototype proof-of-concept solutions that accelerate technical enablement and create tangible value for partners (or direct advertisers). These bu…
- Collaborate directly with engineering teams at partner (or direct advertiser) organizations to optimize performance, address integration gaps, and troublesho…
- Lead onboarding, testing, and pre-launch support to ensure a smooth and successful implementation experience.
- Represent the technical voice of the partner (or direct advertiser) internally, surfacing feedback and influencing product and platform priorities to improve…
- Support escalations for complex or high-impact integrations and provide clear, actionable direction to resolve blockers quickly and sustainably.
- Bachelor’s degree in Computer Science, Engineering, or a related field—or equivalent practical experience.
- 5+ years of software development experience, with a strong track record of owning end-to-end technical projects, including cross-org coordination.
- Hands-on coding expertise in one or more modern programming languages (e.g., Python, Java, JavaScript, Node.js), with a focus on backend or API development.
- Proven ability to contribute directly to external integrations and prototype in partner environments.
Competencies an interviewer will look for
- Technical skill Core
In the posting: “The Ads Business Engineering team operates at the intersection of engineering, product, sales, and business development, delivering technical expertise and s…” · “At Reddit, a Business Engineer plays a critical role in driving the success of our advertising API products and platform integrations.” · “This experienced engineer role combines deep technical consulting with hands-on engineering, where you'll guide strategic integrations, often contributing di…”
Show it by: Names the tools, languages or systems used and how; Explains a technical choice and its trade-off. - Ownership and accountability Core
In the posting: “As a key member of this rapidly expanding team, you’ll have the opportunity to take meaningful ownership—driving cutting-edge AdTech integrations, launching …” · “You will be a key technical advisor—trusted to own the end-to-end relationship with Reddit’s most important advertising partners, and execute on the long-ter…” · “5+ years of software development experience, with a strong track record of owning end-to-end technical projects, including cross-org coordination.”
Show it by: Takes a task from start to finish without being chased; Owns a mistake and what was changed after it. - Planning and organisation Core
In the posting: “Collaborate directly with engineering teams at partner (or direct advertiser) organizations to optimize performance, address integration gaps, and troublesho…” · “Represent the technical voice of the partner (or direct advertiser) internally, surfacing feedback and influencing product and platform priorities to improve…” · “Family Planning Support”
Show it by: Shows how priorities were set when everything was urgent; Mentions deadlines met and how. - Attention to detail and quality Core
In the posting: “Lead onboarding, testing, and pre-launch support to ensure a smooth and successful implementation experience.” · “Deep understanding of the AdTech ecosystem and how Reddit’s platform aligns with industry trends and standards.” · “Contributions to developer experience through tooling, documentation, or ecosystem standards.”
Show it by: Gives an example of an error caught before it caused harm; Names the check or standard they used. - Stakeholder management Core
In the posting: “The Ads Business Engineering team operates at the intersection of engineering, product, sales, and business development, delivering technical expertise and s…” · “This experienced engineer role combines deep technical consulting with hands-on engineering, where you'll guide strategic integrations, often contributing di…” · “You will be a key technical advisor—trusted to own the end-to-end relationship with Reddit’s most important advertising partners, and execute on the long-ter…”
Show it by: Shows how they aligned people with different goals; Explains how they handled a 'no' from someone senior. - Problem solving Core
In the posting: “Collaborate directly with engineering teams at partner (or direct advertiser) organizations to optimize performance, address integration gaps, and troublesho…” · “Support escalations for complex or high-impact integrations and provide clear, actionable direction to resolve blockers quickly and sustainably.”
Show it by: Describes a real problem, the options considered and the one chosen; Shows how the cause was found, not just the fix. - Communication Core
In the posting: “Effective communicator with experience presenting complex technical and business ideas to both internal leadership and external stakeholders.” · “Contributions to developer experience through tooling, documentation, or ecosystem standards.”
Show it by: Adapts the message to the listener; Gives an example of explaining something clearly in writing or speech. - Teamwork and collaboration Core
In the posting: “Collaborate directly with engineering teams at partner (or direct advertiser) organizations to optimize performance, address integration gaps, and troublesho…” · “Track record of influencing product roadmaps and getting involved in release, launch and product adoption activities in collaboration with sales, product, an…”
Show it by: Says what they did inside a team, not only what 'we' did; Shows how a disagreement was handled. - Leadership and mentoring Supporting
In the posting: “Effective communicator with experience presenting complex technical and business ideas to both internal leadership and external stakeholders.”
Show it by: Describes setting direction or a standard others followed; Names someone they coached and what changed for them. - Customer focus Supporting
In the posting: “These builds may occur in Reddit’s systems or directly within the client’s or partner’s codebase.”
Show it by: Puts the customer's need in their own words; Shows a result for the customer, not only for the company. - Adaptability and learning Supporting
In the posting: “Flexible Vacation (please use them!) & Reddit Global Wellness Days”
Show it by: Describes learning something new quickly and using it; Shows a change of plan and how they adjusted.
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Read the interview answer library
Strong sample answers to every practice question below, with why they work and the mistakes that cost points. Nothing to type.
Interview journey 25 questions in groups of 5, a new random order each time, then the HR Perspective analysis; no account needed.
HR Perspective question bank Browse 53 prompts with topic filters, answer criteria and follow-up practice.
Practice questions
- Tell me about yourself. Dedicated step-by-step practice.
- If an interviewer asks something improper How to respond to questions about age, family, origin or health.
- Built from this posting (8):
- Walk me through a piece of work where you used your strongest technical skill. What exactly did you do? From this posting
- Tell me about a task you took from start to finish without anyone asking you to. From this posting
- You have three urgent tasks due today and time to finish only two. How do you decide? From this posting
- Tell me about a time you caught an error before it reached a customer or a report. From this posting
- How have you used python in your work? Walk me through one real example. From this posting
- Tell me about a problem you solved using javascript. From this posting
- Tell me about a time you helped someone on your team get better at their work. From this posting
- Describe a time you went out of your way to solve a customer's problem. From this posting
- This posting reads as Software engineering: its questions come first.
- Walk me through a feature you built from start to finish. What tools and languages did you use? Software engineering
- Tell me about the hardest bug you have tracked down. How did you find the cause? Software engineering
- Describe a technical design decision you made and the trade-off behind it. Software engineering
- Tell me about a time you disagreed with a teammate in a code review. Software engineering
- Production is down and you are the first engineer to notice. What do you do in the first 30 minutes? Software engineering
- How do you decide what to test before you ship a change? Software engineering
- Tell me about a time you helped a less experienced engineer get unstuck. Software engineering
- Your estimate for a feature turns out to be badly wrong halfway through. What do you do? Software engineering
- Two managers ask you to book the same room at the same time. What do you do?
- Tell me about a sale or agreement you are proud of.
- Describe a time you handled an upset customer or colleague.
- Tell me about a time you had several deadlines at once. How did you decide what to do first?
- Give an example of a mistake you caught before it caused a problem.
- Tell me about a time you taught someone how to do something.
- Describe a time you took the lead without being asked.
- Tell me about a time you had to explain something complicated in simple terms.
- Describe a process you improved.
- Do you have any questions for us?
- Why do you want to work here?
- Why is there a gap in your employment? Difficult question
- Why did you leave your last job? Difficult question
- Why are you changing careers? Difficult question
- What is your greatest weakness? Difficult question
- What are your salary expectations? Difficult question
- You seem overqualified for this role. Why do you want it? Difficult question
- Improper-question practice: How old are you? / Do you have children? / Where are you from originally?
- A customer is angry about a delay you did not cause. What do you do?
- How do you keep track of many open customer requests?
- Tell me about a time you could not give a customer what they wanted.
- You find that the inventory count does not match the system. What do you do?
- Tell me about a time a shipment or delivery went wrong.
- How do you make sure safety rules are followed on a busy shift?
- How have you used spreadsheets in your work?
- Tell me about a time you had to enter or check a lot of data accurately.
- A prospect says your price is too high. How do you respond?
- How do you keep your pipeline organised?
- Tell me about a technical problem you solved on your own.
- You find a bug right before a release. What do you do?
- Walk me through how you would check whether a report's numbers are right.

