AWS Solutions Architect Interview Questions: The 2026 Technical Prep Guide

Last updated: August 13, 2026

By Tom Kenaley, Co-Founder and President, KORE1

AWS solutions architect interview questions in 2026 map to the four domains AWS uses to grade the SAA-C03 exam: security, resilience, performance, and cost, and the best hires can defend a real trade-off in each one. A certification proves someone studied. It does not prove they can design under a real constraint, with a real budget, in front of a stakeholder who wants the answer by Friday.

I’ve sat in on more of these interviews than I can count since we started KORE1 in 2005. Most default to the identical script. Someone reads off a list of AWS services and asks the candidate to define each one. S3 is object storage. EC2 is compute. Correct answers, every time, and completely useless as a signal. Anyone who spent a weekend with a Udemy course can recite the glossary.

This list is built differently. It’s organized around the four SAA-C03 exam domains because that’s the framework AWS itself uses to decide who’s ready, and it’s the same lens a hiring manager should use to decide who’s actually good at the job. Each section pairs a real interview question with what a strong answer sounds like and what a weak one gives away.

Quick bias note, because you’ll trust this more if I say it up front. We run a solutions architect staffing desk inside a broader IT staffing practice at KORE1, and this guide exists partly to demonstrate that we actually know the technical ground we recruit on. If you can run this loop yourself with the questions below, you don’t need us. Plenty of hiring managers can.

What This List Covers, and What It Deliberately Skips

We already wrote the leadership-and-judgment version of this topic. It’s called Solutions Architect Interview Questions, and it’s about trade-offs, stakeholder management, and reading whether someone can survive the political side of the job. That piece is right that judgment matters more than trivia. It’s also thin on the actual AWS technical ground, on purpose, because that piece is about the role in general.

This one isn’t general. If your req specifically says AWS, or your team is 90% on AWS and drifting further in that direction, you need someone who can go deep on IAM policy evaluation order, not just gesture at “the cloud.” That’s what’s below. Service-specific, scenario-based, and organized by the same four domains AWS weights the actual exam against: Design Secure Architectures at 30%, Design Resilient Architectures at 26%, Design High-Performing Architectures at 24%, and Design Cost-Optimized Architectures at 20%, according to the official AWS SAA-C03 exam guide.

Notice cost is the smallest slice on the exam. It’s rarely the smallest slice of what actually blows up a budget six months into production. We’ll get to that.

Security Questions. This Is 30% of the Exam for a Reason

Security is the single largest domain on the SAA-C03, and it should probably be a bigger share of your interview than 30%. A resilience mistake shows up as an outage. A security mistake shows up as a breach disclosure, and those don’t get fixed in a maintenance window.

Walk me through how you’d lock down access for a new team joining a shared AWS account.

A strong answer starts with IAM roles, not IAM users. Nobody should have a long-lived access key sitting in a laptop’s environment variables in 2026. The candidate should talk about least privilege from day one, scoped permission boundaries, and probably a separate AWS account for the new team rather than cramming everyone into one account and hoping tags hold the line. Bonus points if they mention AWS Organizations and Service Control Policies without being prompted.

A weak answer jumps straight to “create an IAM user and attach a policy.” Technically works. Also the exact pattern that turns into an incident report eighteen months later, when nobody remembers who has what key or why.

Two S3 buckets. One holds public marketing assets. One holds customer PII. How do you architect access so a misconfiguration in one can’t touch the other?

Separate accounts, ideally. Separate buckets at minimum, with bucket policies that deny public access explicitly rather than relying on defaults, S3 Block Public Access turned on at the account level, and encryption at rest with KMS for the PII bucket specifically. A candidate who mentions VPC endpoints so traffic to the PII bucket never touches the public internet is thinking past the exam and into how a real security team would actually sign off on this.

Here’s the part that trips people up. Good candidates sometimes ask a clarifying question before answering: is the marketing bucket write access shared with an outside agency? That single question tells you more than the next three minutes of their answer will.

Someone on the team wants to open port 22 to 0.0.0.0/0 “just for now” to unblock a deploy. What do you say?

No. Then the actual answer. Session Manager through Systems Manager, no open inbound SSH at all, or at minimum a bastion locked to a corporate IP range with the security group tightened back down the same day, not “eventually.” A candidate who caves to schedule pressure in an interview will cave to it in production, and “just for now” security holes are how half the breach post-mortems I’ve read start.

Resilience Questions. Domain 2, 26% of the Exam

This is where candidates either separate themselves or reveal they’ve never actually operated something under load. Multi-AZ is table stakes. The real signal is whether they understand what happens when a dependency, not the whole region, fails.

Your application calls a third-party payment API that has a bad afternoon and starts timing out. What does your architecture do about it?

Circuit breaker pattern, exponential backoff with jitter, and a queue, probably SQS, so the failure doesn’t cascade backward into your own system and take down checkout entirely. A candidate who says “retry the request” and stops there hasn’t thought about what happens when ten thousand retries hit an already-struggling API at once. That’s not resilience. That’s a denial-of-service attack you launched against your own vendor.

Design a disaster recovery approach for a system where the business says RTO is four hours and RPO is fifteen minutes. Walk me through the actual AWS services.

Daily backups are out immediately with a fifteen-minute RPO on the table. The candidate needs continuous or near-continuous replication, think Aurora Global Database or DMS ongoing replication depending on the data store, plus a warm standby in a second region rather than a cold backup-and-restore approach, which usually can’t hit a four-hour RTO once you account for DNS propagation and validation. Ask them to price it. A lot of candidates can name the services and completely lose the thread on what warm standby actually costs to run idle.

Tell me about a time an architecture you designed failed in a way you didn’t predict.

This one isn’t really about AWS. It’s about honesty. Every architect who’s shipped more than a handful of systems has a failure story. Candidates who don’t have one, or who deflect the question into something that was clearly someone else’s fault, are either too junior to have real scars yet or not being straight with you. Neither is disqualifying by itself. Both are worth knowing before an offer goes out.

Performance Questions. Domain 3, 24% of the Exam

Performance questions are where candidates love to show off. Watch for whether they can also tell you when the fast answer is wrong.

Read-heavy application, spiky traffic, users complaining about latency on a product catalog page. What do you look at first?

Caching, almost always. CloudFront in front of static assets, ElastiCache in front of the database for the catalog reads specifically, and a real conversation about cache invalidation strategy, because a candidate who adds a cache without a plan for staleness has traded one problem for a quieter, worse one. DynamoDB with a well-chosen partition key is often the right call over RDS here if the access patterns are simple key lookups. If they reach for a bigger RDS instance as step one, that’s a candidate optimizing for the interview answer, not the actual bill.

When would you pick DynamoDB over RDS, and when is that the wrong call?

Right call: known, simple access patterns, need for single-digit-millisecond latency at scale, willingness to design around the partition key up front. Wrong call: the application needs complex joins, ad hoc reporting queries, or the access patterns aren’t fully known yet and are going to keep changing for the next six months. A candidate who says “DynamoDB is just better, it’s serverless” without qualifying that answer either hasn’t built a reporting dashboard against a NoSQL table or is telling you what they think you want to hear.

I’ll push back on my own framing here for a second. Plenty of good architects would pick DynamoDB anyway and bolt on OpenSearch or a data warehouse for the reporting side. That’s a legitimate answer too. What matters is whether they see the trade-off at all.

Cost Questions. Domain 4, Only 20% of the Exam, and the One Almost Nobody Studies For

Twenty percent on the exam. A much bigger percentage of the phone call a VP of Engineering makes to their CFO in month four, asking why the AWS bill tripled since launch.

Explain the difference between Reserved Instances, Savings Plans, and Spot, and when you’d actually use each.

Reserved for steady, predictable baseline load you’re confident won’t change for a year or three. Savings Plans for the same idea with more flexibility across instance families, which is why they’ve mostly replaced RIs for new commitments. Spot for anything interruption-tolerant: batch jobs, CI pipelines, stateless workers behind an ASG that can absorb a two-minute interruption notice without anyone noticing. A candidate who suggests Spot for a stateful production database is either testing you or hasn’t been burned by a Spot reclaim at 2 a.m. yet.

A team’s S3 bill is climbing every month and nobody can explain why. Where do you look?

Storage class first. Data that hasn’t been accessed in ninety days sitting in S3 Standard instead of Intelligent-Tiering or Glacier is the single most common answer I’ve seen in real audits. Lifecycle policies that were never configured. Versioning left on with no cleanup rule, quietly retaining every old copy of every object forever. None of this is exotic. It’s just unglamorous, which is exactly why it gets skipped.

The Scenario Question We’d Ask Before Any of the Above

We placed a senior AWS architect earlier this year at a mid-market logistics software company outside Phoenix. Twice already, the hiring manager’s own loop had stalled on candidates who could recite every service in the console and freeze on one question: “Walk me through migrating this specific monolith, the one on your screen right now, off its current EC2 instances and onto something that survives a 4x Black Friday traffic spike. You have six weeks and the CFO is watching the AWS invoice.”

That question isn’t on any certification. It’s the whole job compressed into one ask. A candidate has to sequence the work, name the services, admit what they don’t know about the existing system yet, and put a number on it. The person we placed answered by asking three questions before proposing anything: current RDS instance class, whether the monolith had any hard dependencies on instance-local storage, and what “survives” actually meant in terms of acceptable latency. That’s the tell. Not the AWS knowledge. The instinct to find out what’s actually true before designing around what might be true.

We’ve built our whole search process around finding that instinct, which is a large part of why KORE1 has run IT and technical staffing since 2005 with an average time-to-hire of 17 days for IT roles. That number holds up because we screen for exactly this before a resume ever reaches a client’s desk, not because the market got easier.

Certifications, Comp, and Whether SAA-C03 Actually Predicts a Good Hire

Short answer: it predicts effort, not skill. Longer answer follows.

The SAA-C03 is a well-built exam. Sixty-five questions, fifty scored and fifteen unscored for future development, a scaled score of 100 to 1,000 with 720 needed to pass, according to AWS’s own certification documentation. Passing it means someone studied real material and can reason through multiple-choice scenarios under time pressure. It does not mean they’ve ever had to explain a $40,000 monthly AWS bill to someone who controls their budget for next quarter. Those are different skills, and job postings that treat the certification as a pass-fail gate filter out people who’d be excellent and let through people who are excellent test-takers and nothing else.

On pay: ZipRecruiter puts the national average AWS solutions architect salary at $136,232 as of August 2026, with most roles landing between $128,000 and $144,500. Glassdoor runs considerably higher, averaging $164,935, with a range up to $206,962. That’s a $28,700 gap between two reputable aggregators for the same title. Not a typo, either. It’s what happens when self-reported comp data gets blended across junior cloud engineers wearing an “architect” title on LinkedIn and senior architects at companies where the title actually means something. Use the range, not the average, and check it against a role scoped to your actual level.

Run your own number before you post the req. Our salary benchmark tool pulls current comp data against your specific city and level rather than a national blend that flattens Boise and the Bay Area into one figure.

Worth naming plainly: AWS still runs the market these candidates are trained for. Twenty-eight percent of global cloud infrastructure spend went to AWS in the first quarter of 2026, per Synergy Research Group, ahead of Microsoft at 21% and Google at 14%. The Bureau of Labor Statistics projects the closest tracked occupation, computer network architects, to grow 12% from 2024 to 2034, well above the average for all occupations, with roughly 11,200 openings a year. The demand side was never the problem. Finding someone who can do the job past the certification is.

Whether you hire this person direct or bring them in on a contract basis first to prove out the fit before committing to a full-time offer through direct hire depends mostly on how settled your AWS footprint already is. A greenfield build favors direct hire, because you want someone invested past the first sprint. A migration off legacy infrastructure with a defined end date is often a cleaner contract engagement.

Before You Build the Loop

Six to eight questions is the right number for a single technical round. Pick two from security, two from resilience or performance, one from cost, and end with a scenario question tied to your actual environment. More than eight and you’re testing stamina, not skill.

Does the SAA-C03 actually correlate with job performance?

Loosely, and mostly at the associate level. It filters out people who haven’t put in real study time. It does nothing to filter for judgment, communication, or the instinct to ask a clarifying question before proposing an architecture. Treat it as a floor, never a ceiling.

Associate or Professional certification, which one actually matters for a mid-level hire?

Associate for most mid-level roles. The Professional exam tests organizational-scale patterns, multi-account governance, and complex migrations that most mid-level architects haven’t actually touched yet, regardless of what they’ve studied. A Professional cert on a resume with three years of experience is sometimes a great sign and sometimes a sign someone is a phenomenal test-taker. Ask them to walk through one Professional-level scenario live and you’ll know which.

Should the whiteboard exercise use our real AWS environment or a generic prompt?

Yours, if you can sanitize it without exposing anything sensitive. A generic prompt tests whether someone memorized a pattern from a course. Your actual environment, with real constraints and real ugly history baked in, tests whether they can design for the system that actually exists instead of the clean one from the textbook.

AWS-specific or multi-cloud, does it matter which we ask for?

If your workload is genuinely AWS and staying that way, ask AWS-specific questions. A strong architect’s underlying skills transfer across clouds, but the fastest ramp comes from someone who already knows your provider’s sharp edges. IAM’s policy evaluation logic isn’t the same as Azure’s RBAC, and pretending otherwise costs you weeks of onboarding you didn’t budget for.

Realistically, how fast can a search like this move?

Three to six weeks for most AWS solutions architect searches, longer if you’re holding out for someone with a specific migration background or a security clearance. Our own IT search average lands around 17 days across all roles, though senior cloud and architect-level searches typically run past that baseline given the smaller qualified pool.

If your loop keeps stalling on candidates who ace the trivia and freeze on the scenario question, or you’d rather skip straight to people who’ve already cleared that bar, reach out to our team. We’ll tell you honestly whether this is a search you can run yourself first.