What data structures must I know for coding interviews?

Master these 8 data structures: arrays, hash maps, linked lists, stacks, queues, trees (binary/BST), graphs, and heaps. According to LeetCode analysis, hash maps and arrays appear in 70%+ of coding problems. Also understand trade-offs between them for different use cases.

How do I improve my algorithm solving speed?

Focus on pattern recognition over memorization. There are approximately 15-20 algorithm patterns that cover 90% of interview problems. Practice identifying patterns in the first 2 minutes of reading a problem. Use AissenceAI real-time hints to build intuition during practice.

What is the most tested algorithm in coding interviews?

Binary search and its variations are the most frequently tested, appearing in approximately 25% of coding interviews. BFS/DFS (20%), two pointers (18%), dynamic programming (15%), and sliding window (12%) round out the top 5.

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25 AWS Interview Questions for Solutions Architect

February 21, 2026

Technical Tips5 min read

25 AWS Interview Questions for Solutions Architect

AWS Interview Questions: Solutions Architect Level

AWS Solutions Architect interviews (both the certification and job interviews) test your ability to design resilient, high-performing, secure, and cost-optimized architectures on AWS. AWS has 33% cloud market share and is the most commonly tested cloud platform.

The AWS Solutions Architect mindset: every design decision has trade-offs between cost, performance, reliability, and operational complexity. Interviewers want to see that you can articulate these trade-offs, not just name services.

Must-Know AWS Services

Category	Services
Compute	EC2, Lambda, ECS, EKS, Fargate
Storage	S3, EBS, EFS, Glacier, FSx
Database	RDS, DynamoDB, Aurora, ElastiCache, Redshift
Networking	VPC, ALB/NLB, Route 53, CloudFront, API Gateway
Security	IAM, KMS, WAF, Shield, Cognito