1. Logical Thinking 

Expectation: Exceptional 

• Able to break down complex problems into simple, clear steps 
  

• Thinks in terms of scalability, failure scenarios, and trade-offs 
  

• Can reason about performance, concurrency, and data flow 
  

• Provides multiple solution approaches and explains why one is chosen 
  

2. Golang Concepts 

Expectation: Expert-Level 

Candidate should demonstrate strong understanding of: 

• Goroutines, channels, select 
  

• Concurrency patterns (worker pools, fan-in/fan-out) 
  

• Interfaces and interface-driven design 
  

• Memory management and garbage collection 
  

• Error handling best practices 
  

• Context usage (context.Context) 
  

• Go scheduler and runtime basics 
  

• Escape analysis and performance implications 
  

• Package and module design 
  

Expect depth + reasoning, not just definitions. 

3. Golang Hands-on Coding 

Expectation: Excellent (Production-Ready) 

• Writes clean, idiomatic Go code 
  

• Follows best practices and standard library usage 
  

• Handles errors properly 
  

• Designs code for readability and maintainability 
  

• Writes concurrent code safely 
  

• Can refactor poor code and explain improvements 
  

Code should reflect lead-level maturity, not just correctness. 

4. Database (MySQL / SQL Design) 

Expectation: Strong to Expert 

• Strong SQL knowledge: 
  

• GROUP BY, HAVING, LIMIT, OFFSET 
  

• Joins, subqueries, indexes 
  

• Can design schemas based on access patterns 
  

• Understands: 
  

• Indexing strategies 
  

• Query optimization 
  

• Transactions and isolation levels 
  

• Experience with migrations and schema evolution 
  

• Aware of scaling strategies (read replicas, caching)