How to Prepare for a Forward Deployed Engineer Interview

You've made it through the application stage and secured an interview for a Forward Deployed Engineer (FDE) role. Now comes the important part: showing an employer that you have the technical skills, problem-solving ability and communication skills needed to succeed in the role.

A Forward Deployed Engineer interview can be different from a traditional Software Engineer interview. While your technical ability will still be assessed, you may also be asked to demonstrate how you approach ambiguous problems, work with customers, communicate technical concepts and take ownership of a solution from beginning to end.

This is because FDEs don't simply build software. They work at the intersection of engineering, technology and customer problem-solving, often taking a loosely defined business challenge and turning it into a practical technical solution.

So, how should you prepare for a Forward Deployed Engineer interview?

The key is to prepare across three areas: technical ability, problem-solving and communication. You should be able to demonstrate not only that you can build something, but that you understand what should be built, why it matters and how you would make it work in a real customer environment.

What Does a Forward Deployed Engineer Interview Assess?

There is no single interview process for every FDE role. The exact structure will depend on the company, product and seniority of the position.

However, you can expect an FDE interview to explore several core areas.

Technical skills

You will still need to demonstrate that you can write code, understand systems and work with the technologies relevant to the role.

Depending on the position, this could include:

• Software engineering fundamentals

• Python, JavaScript, TypeScript or another relevant programming language

• APIs and integrations

• Databases and data

• Cloud infrastructure

• System design

• AI and LLM applications

• Debugging

• Deployment

The emphasis may be less about finding the most theoretically optimal answer and more about demonstrating that you can build something practical and reliable.

Problem-solving

FDEs are often given problems rather than perfectly defined requirements.

An interviewer may therefore give you a scenario and ask how you would approach it.

They are interested in how you think.

Do you ask the right questions? Can you identify the real problem? Can you prioritise? Do you consider constraints and risks before jumping into a solution?

Customer and stakeholder communication

A Forward Deployed Engineer can spend significant time working directly with customers and stakeholders.

You may therefore be asked to explain a technical concept to someone without an engineering background, deal with conflicting requirements or respond to a challenging customer scenario.

The interviewer isn't necessarily looking for a perfect answer. They want to understand whether you can communicate clearly, listen carefully and remain calm when faced with uncertainty or pushback.

Ownership and accountability

FDEs are often expected to take ownership of projects from discovery through to deployment.

Be prepared to discuss situations where you:

• Took responsibility for a project

• Solved a problem outside your immediate responsibilities

• Worked independently

• Made a difficult decision

• Dealt with a production issue

• Managed changing requirements

• Delivered something under pressure

Your examples should demonstrate what you did, rather than only describing what your wider team achieved.

Prepare for Practical Technical Questions

One of the most important parts of preparing for a Forward Deployed Engineer interview is understanding that technical questions may be highly practical.

Rather than only revising theoretical concepts, practise building and troubleshooting real applications.

For example, you could be asked to:

• Build a small application

• Work with an API

• Process a dataset

• Debug an existing piece of code

• Design an integration

• Explain how you would deploy a solution

• Improve the performance of an existing system

• Work through an AI or LLM use case

The exact format will vary between employers, so always ask your recruiter what you should expect where possible.

Don't just practise coding. Practise explaining your decisions.

During an FDE interview, your interviewer may be interested in why you chose a particular approach.

Be prepared to explain:

• Why you chose a particular technology

• What assumptions you made

• What trade-offs you considered

• What could go wrong

• How you would test your solution

• How you would deploy it

• How you would monitor it

• What you would change if the requirements changed

This is particularly important for FDE roles because real-world engineering rarely involves one perfect solution.

Prepare for Ambiguous Problems

This is one of the biggest areas where an FDE interview can differ from a traditional Software Engineer interview.

You may be given a deliberately vague problem.

For example:

"A customer says their AI search tool isn't working. What would you do?"

There isn't enough information here to immediately start building a solution.

That's the point.

A strong candidate would start by asking questions.

Who is experiencing the problem?

What does "isn't working" mean?

What were they expecting to happen?

What is happening instead?

When did the problem start?

Is it affecting every user or only certain users?

What data is the system working with?

Have there been any recent changes?

Only once you've understood the problem should you start discussing potential solutions.

This demonstrates an important FDE skill: don't solve the wrong problem.

Use a Structured Approach to Problem-Solving

When you're presented with an unfamiliar problem during an interview, it can be tempting to start talking immediately.

Instead, take a moment to structure your thinking.

A useful approach is:

1. Clarify the problem

Make sure you understand what the customer or interviewer is actually asking.

2. Identify the desired outcome

What does success look like?

3. Understand the constraints

Consider technology, data, security, budget, time, infrastructure and customer requirements.

4. Break the problem down

Separate the problem into smaller, manageable components.

5. Prioritise

Identify what needs to be solved first and what can wait.

6. Propose a solution

Explain your approach and why you've chosen it.

7. Consider risks

What could go wrong? What assumptions are you making?

8. Explain how you would test and measure success

A solution isn't complete simply because it works technically. You also need to know whether it solves the customer's problem.

This approach demonstrates that you can bring structure to ambiguity, which is an important part of Forward Deployed Engineering.

Prepare for AI and LLM Questions

If you're interviewing for an AI Forward Deployed Engineer role, you should expect questions around practical AI applications.

You may be asked about:

• Large Language Models

• RAG

• AI agents

• Prompt engineering

• Vector databases

• Model selection

• AI evaluation

• Hallucinations

• Data privacy

• Security

• AI application architecture

• Monitoring and reliability

  
  

However, don't focus solely on definitions.

Think about how you would use these technologies to solve a real business problem.

For example, rather than simply explaining what RAG is, you should be able to discuss when you might use it, what data it requires, how you would evaluate the results and what could cause the system to produce poor answers.

You should also be prepared to explain the limitations of AI.

Strong FDE candidates understand that implementing AI isn't simply about choosing a model and connecting an API. You need to consider reliability, data quality, security, cost, latency, evaluation and the customer's actual requirements.

Prepare Your Customer-Facing Skills

This is an area candidates sometimes underestimate.

You might be an excellent Software Engineer, but an FDE needs to communicate with customers and stakeholders as well as technical teams.

You may be asked to role-play a customer conversation or explain how you would handle a difficult situation.

For example:

"You've built a solution, but the customer says it isn't what they asked for. What do you do?"

Avoid immediately becoming defensive.

Instead:

• Listen to the customer's concerns

• Clarify what they expected

• Identify where the misunderstanding occurred

• Explain what can be changed

• Discuss any technical limitations

• Agree on the next steps

The ability to remain calm and solution-focused is valuable.

Practise explaining technical concepts simply

Choose a technical project you've worked on and practise explaining it to someone who doesn't have an engineering background.

Avoid unnecessary jargon.

Think about:

What was the problem?

Why did it matter?

What did you build?

How did it work?

What was the result?

If you can explain a complex project clearly to a non-technical person, you're demonstrating exactly the type of communication an FDE role requires.

Prepare Your STAR Examples

Behavioural questions are likely to form part of your Forward Deployed Engineer interview.

A useful way to prepare is the STAR method:

Situation: What was happening?

Task: What were you responsible for?

Action: What did you actually do?

Result: What happened as a result?

For an FDE interview, prepare examples around:

• Working with an ambiguous problem

• Taking ownership

• Building something from scratch

• Working with a difficult stakeholder

• Handling a production incident

• Working under pressure

• Changing direction when requirements changed

• Explaining something technical to a non-technical person

• Making a decision with incomplete information

• Learning a new technology quickly

• Delivering a project with a tight deadline

• Dealing with something that went wrong

Most importantly, make sure your examples are genuinely yours.

Don't memorise an elaborate answer word-for-word. Understand the story well enough that you can talk naturally about what happened and answer follow-up questions.

Questions You Could Be Asked in a Forward Deployed Engineer Interview

Preparing for specific questions can help you feel more confident, but don't try to memorise perfect answers.

Instead, think about the experiences you have that demonstrate the underlying skill.

Technical questions

• Tell me about a system you've built from start to finish.

• What is the most technically challenging project you've worked on?

• How would you design an API for this use case?

• How would you debug this system?

• How would you approach deploying this application?

• How would you integrate this system with an existing customer environment?

• How would you improve the performance of this application?

• Tell me about a technical decision you made and why you made it.

  
  

AI questions

• Tell me about an AI application you've built.

• How would you decide which LLM to use?

• When would you use RAG?

• How would you evaluate an LLM-powered application?

• How would you reduce hallucinations?

• What are the risks of deploying an AI application?

• How would you integrate an LLM into an existing customer system?

  
  

Problem-solving questions

• Tell me about a time you were given an ambiguous problem.

• How do you approach a problem when you don't know the answer?

• A customer tells you their system isn't working. Where would you start?

• How would you prioritise several competing customer requirements?

• Tell me about a time you had to make a decision without having all the information.

  
  

Customer and behavioural questions

• Tell me about a difficult stakeholder you've worked with.

• Tell me about a time something went wrong in production.

• Tell me about a time you disagreed with a customer or stakeholder.

• Tell me about something you built that you're particularly proud of.

• Tell me about a time you had to explain something technical to a non-technical person.

• Tell me about a time you had to learn something quickly.

• Why do you want to become a Forward Deployed Engineer?

• Why FDE rather than traditional Software Engineering?

  
  

Have a Strong Answer to "Why FDE?"

This is a question you should definitely prepare for.

Your answer should go beyond:

"It sounds like an interesting role."

Think about what genuinely attracts you to Forward Deployed Engineering.

Perhaps you enjoy:

• Working directly with customers

• Solving complex problems

• Building things from scratch

• Working across different technologies

• Seeing the impact of your work

• Working in AI

• Having greater ownership

• Working in fast-moving environments

The strongest answer will connect the role to your own experience and motivations.

For example:

"I've realised that the projects I enjoy most are the ones where I'm given a problem rather than a predefined specification. I like understanding what someone is trying to achieve, working out the technical solution and then seeing it used in the real world. That's what attracted me to FDE."

Make it personal rather than giving an answer you've found online.

Research the Company Before Your Interview

Technical preparation is important, but don't forget the company itself.

Before your interview, understand:

• What does the company build?

• Who are its customers?

• What problems does its technology solve?

• How is AI used within its product?

• What industries does it work with?

• What does the FDE team actually do?

• What technologies are mentioned in the job description?

• What would you potentially be responsible for?

  
  

Then think about how your experience connects to the role.

If the company works with enterprise customers, for example, think about examples where you've worked with complex systems or stakeholders.

If it is an AI-focused company, prepare examples that demonstrate your practical AI experience.

Questions to Ask Your Interviewer

An interview isn't just an opportunity for a company to assess you. It's also an opportunity for you to understand whether the role is right for you.

Good questions could include:

• What does a typical FDE project look like?

• How much time does an FDE typically spend working directly with customers?

• What does success look like in the first six months?

• How much of the role is coding versus customer interaction?

• What technologies does the FDE team work with most frequently?

• How are customer requirements fed back into the product and engineering teams?

• What is the biggest challenge FDEs currently face?

• What separates your strongest FDEs from the rest of the team?

• How does the role develop as someone becomes more senior?

These questions can also help you understand whether the position genuinely matches what you're looking for.

Common Mistakes to Avoid in an FDE Interview

Jumping straight to a solution

If you're given an ambiguous problem, don't immediately start designing the system.

Ask questions first.

Focusing only on technical ability

Being technically strong is important, but FDEs also need communication, customer and problem-solving skills.

Giving vague answers

Use specific examples from your experience.

Explain what you did and what happened as a result.

Overusing technical jargon

If you're explaining a solution to a non-technical stakeholder, make it understandable.

Pretending you know something you don't

If you don't know the answer, don't bluff.

Explain how you would approach finding the answer. Demonstrating curiosity, honesty and structured thinking can be much more valuable.

Forgetting the customer

Always connect your technical solution back to the problem you're trying to solve.

A technically impressive solution isn't necessarily a good solution if it doesn't address the customer's needs.

How to Prepare in the Week Before Your Interview

If your interview is coming up soon, focus your preparation rather than trying to learn everything.

A few days before

Review:

• The job description

• The company's product

• The technologies mentioned in the role

• Your CV

• Your key projects

• Your AI experience

• Your customer-facing experience

Prepare several STAR examples covering ownership, ambiguity, problem-solving, conflict and communication.

Practise out loud

Don't only prepare answers silently.

Talk through technical problems out loud and practise explaining your projects as though you're speaking to an interviewer.

This can help you identify where your explanations become unclear or overly technical.

Revisit your projects

Be prepared to go deep into anything listed on your CV.

If you've written that you built an AI application, expect questions about:

• Why you built it

• How it works

• The architecture

• The technologies you used

• Challenges you faced

• Trade-offs you made

• How you tested it

• What you would change

• What the result was

  
  

The day before

Don't spend the entire day trying to learn another technology.

Review your preparation, understand the role, prepare your questions and make sure you can clearly explain why you're interested in becoming a Forward Deployed Engineer.

Preparing for a Forward Deployed Engineer interview requires more than revising technical questions.

You need to demonstrate that you can understand a problem, ask the right questions, build a practical solution and communicate effectively with the people relying on it.

Your technical skills will get you part of the way. Your ability to work through ambiguity, take ownership and understand the customer's perspective can set you apart.

Before your interview, make sure you can confidently answer three questions:

Can I build it?

Can I work out what needs to be built?

Can I explain it and take ownership of making it work?

If the answer to all three is yes, you're already thinking like a Forward Deployed Engineer.

At Peritus Partners, we work with technology and AI professionals and businesses across the evolving tech landscape. If you're considering your next move into Forward Deployed Engineering or another emerging technology role, our team can help you understand the market and find opportunities that align with your skills and ambitions.

Not quite ready to interview for an FDE role yet? Perhaps you are still considering if this may be for you? Check out our blog How to Become a Forward Deployed Engineer: A Guide for Software Engineers for more advice.