AWS skills employers
want for cloud jobs

AWS fundamentals are the core services and concepts most AWS jobs use daily: global infrastructure (regions, availability zones, edge locations); compute (EC2, Auto Scaling, Lambda, containers); storage (S3, EBS, EFS); databases (RDS, DynamoDB); networking (VPC, subnets, security groups, load balancers, Route 53, CloudFront); identity (IAM users, roles, policies); monitoring (CloudWatch, CloudTrail); and pricing and cost management. AWS's own overview of cloud computing explains the on-demand, pay-as-you-go model behind all of these.¹

Security begins with the shared responsibility model: AWS secures the cloud, and customers secure what they put in it.² AWS is the most widely used cloud among developers, at 43.3% in Stack Overflow's 2025 survey.³ Costs matter too; the State of FinOps 2026 report shows cloud cost management expanding, with 98% of teams now managing AI spend.⁴ In India, AmbitionBox lists AWS cloud engineers at a typical ₹7.6–8.3 lakh.⁵

Developers using AWS (Stack Overflow 2025)

43.3%

Typical AWS cloud engineer pay in India (AmbitionBox)

₹7.6–8.3 lakh

FinOps teams managing AI spend (State of FinOps 2026)

98%

Availability zones for a resilient design

2+

Table: How AWS skills are assessed (editorial summary)

Table: A simple, resilient AWS web architecture (illustrative)

Table: How AWS skills became mainstream (editorial summary)

• A deployed free-tier project with diagram
• IAM roles and a least-privilege policy
• S3 with public access blocked
• CloudWatch alarm and budget alert
• Infrastructure defined as code
• A verified AWS fundamentals certificate

Show depth: "Built and documented a two-AZ web app on AWS with EC2 Auto Scaling, RDS, S3 and CloudFront; IAM roles only; budget and CloudWatch alarms; deployed with Terraform."

"EC2 vs Lambda — when to use each?"

EC2 for long-running or custom workloads; Lambda for event-driven, short tasks without managing servers.

"How do you secure an S3 bucket?"

Block public access, least-privilege bucket policies, encryption and access logging.

"What's a security group?"

A stateful virtual firewall for resources like EC2 instances.

"How do you make an app highly available on AWS?"

Multiple AZs, load balancing, Auto Scaling, Multi-AZ databases and health checks.

"Why use IAM roles instead of access keys?"

Roles give temporary credentials that are harder to leak and easier to manage.

• "How many AWS accounts and how are they organised?" — scale.
• "Is infrastructure in code?" — maturity.
• "How are costs reviewed?" — FinOps culture.
• "What does on-call involve?" — responsibilities.

Table: AWS-related roles and typical pay in India (AmbitionBox, October 2026; indicative)

Table: Common AWS tools (editorial guidance)

• Cloud support / admin — operations.
• AWS cloud engineer — builds workloads.
• DevOps / platform engineer — automation.
• Solutions architect — designs.
• Principal / head of cloud — strategy.

1. Week 1: IAM and accounts — Secure the root user; create roles; set budgets.
2. Week 2: Core services — EC2, S3, VPC basics.
3. Week 3: Project — Deploy a two-tier app with RDS.
4. Week 4: Prove it — Write it up; take the AWS Cloud Fundamentals Certification.

Related: Cloud Computing, Cloud Security and Infrastructure as Code. Guides: cloud computing, cloud security and infrastructure as code.

• Provisioning — through code.
• Monitoring — alarms and dashboards.
• Troubleshooting — logs and metrics.
• Securing — IAM and configuration reviews.
• Optimising — costs.
• Documenting — architecture.

"What's the difference between a region and an AZ?"

A region is a geographic area; AZs are isolated data centre groups within it.

"What's S3 storage class?"

Different price and access options, from frequently accessed to archival.

Table: A first-90-days plan (editorial guidance)

Learn how accounts, networks and access are organised, and make every change through code review. By the third month, deliver one measurable improvement such as removing unused resources or tightening IAM.

AWS now offers managed AI services and GPU capacity, and many teams are building AI features on them, which adds new cost and security considerations. AI assistants help engineers write infrastructure code, explain IAM policies and troubleshoot errors faster. Their output can include over-broad permissions or costly configurations, so review suggestions carefully. Engineers who understand AWS fundamentals deeply can use AI assistance safely and productively.

Never use the root account for daily work; enable MFA on it and lock it away. Set a budget alert before launching anything. Don't commit access keys to code — use roles. Keep S3 public access blocked unless you deliberately need public content, and even then serve it through a CDN. Don't open SSH to the whole internet; use Session Manager or restrict IPs. Stop or delete resources after experiments. These habits prevent most of the incidents and surprise bills new AWS users face.

Show an architecture diagram, explain why you chose each service, list the security controls and cost estimates, and share what went wrong and how you fixed it. Link to the code. Interviewers care more about your reasoning than about how many services you used.

"You must know every AWS service." Depth in core services matters far more.

"Certification alone gets jobs." Projects and reasoning win interviews.

"The free tier is completely free." Some usage costs money; set budgets.

A VPC is your private network in an AWS region, with an address range you choose. Inside it, subnets live in specific availability zones. Public subnets have a route to an internet gateway, so resources there can be reached from the internet if their security settings allow it. Private subnets have no direct internet route; resources there reach the internet, when needed, through a NAT gateway. A common pattern puts load balancers in public subnets and application servers and databases in private ones.

Security groups act as stateful firewalls attached to resources such as EC2 instances and databases. You allow specific inbound traffic — for example, HTTPS from the load balancer — and responses are allowed automatically. Network ACLs are stateless rules at the subnet level, used less often for fine-grained control. Route tables decide where traffic goes, and VPC endpoints let resources reach AWS services like S3 privately without crossing the internet.

Understanding these pieces lets you design secure, resilient architectures and troubleshoot connectivity. When an instance can't be reached, check the security group, the subnet's route table, network ACLs and whether the instance has a public address or sits behind a load balancer.

Compute, storage, databases and data transfer all cost money, and costs grow quietly. Tag resources, set budgets, stop development instances when not needed, choose appropriately sized instance types and use storage classes for older data. Review Cost Explorer monthly to understand trends. Interviewers increasingly ask about cost, so be ready to explain how you'd keep a project affordable.

• Using the root account.
• Public S3 buckets.
• Hard-coded access keys.
• Single-AZ designs.
• No budget alerts.

AWS usage comes from Stack Overflow's 2025 survey; security responsibilities and cloud concepts from AWS; cost trends from the State of FinOps 2026; and India pay from AmbitionBox (read October 2026). AWS is a trademark of Amazon; Science of Apps' test is independent and not affiliated. The architecture example, project guidance and history are editorial. Last reviewed October 2026.

• EC2 — AWS virtual servers.
• S3 — AWS object storage.
• VPC — your private network in AWS.
• IAM — AWS identity and access management.
• Availability zone — isolated data centres within a region.