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Technical Interview Preparation - Shippio

Date: Friday, July 18th, 9:00–10:00 AM
Interviewers: Gabriel & Arek
Meet URL: meet.google.com/oad-qpwr-hve

🎯 Interview Overview

This is a technical interview focusing on:

  • Getting to know you and your past work experiences
  • Assessing your technical ability
  • Likely deep dive into your DevOps project

📋 Pre-Interview Checklist

Technical Setup (Day Before)

  • Test your demo environment

    • Local Flask app running
    • Docker container working
    • AWS infrastructure accessible
    • GitHub Actions pipeline functional

  • Prepare backup demos

    • Screenshots of AWS Console
    • Video recordings of deployments
    • Code walkthroughs ready

  • Review key files

    • README.md - Project overview
    • ISSUES_FOUND.md - Problem-solving examples
    • STUDY_PLAN.md - Your learning approach
    • Terraform files - Infrastructure as Code
    • GitHub Actions workflows - CI/CD pipeline

Environment Setup (30 minutes before)

  • Test Google Meet

    • Camera and microphone working
    • Screen sharing capability
    • Stable internet connection

  • Prepare your workspace

    • Code editor open with project files
    • Terminal ready for live demos
    • Browser tabs organized (AWS Console, GitHub)

🎯 Key Talking Points

1. Project Introduction (2-3 minutes)

"I built a complete DevOps pipeline for a beer catalog application that demonstrates infrastructure as code, containerization, and automated CI/CD. The project shows my ability to work with AWS, Terraform, Docker, and GitHub Actions from scratch."

Highlight:

  • End-to-end automation
  • No prebuilt modules used
  • Production-ready architecture
  • Real problem-solving experience

2. Technical Architecture (3-4 minutes)

"The architecture follows cloud-native best practices: Flask app containerized with Docker, deployed on ECS Fargate, connected to PostgreSQL RDS in a private subnet, all managed with Terraform and automated via GitHub Actions."

Key Components:

  • Application Layer: Flask with proper error handling
  • Containerization: Secure Docker setup with non-root user
  • Infrastructure: VPC with public/private subnets, security groups
  • Database: RDS PostgreSQL with proper security
  • Automation: GitHub Actions CI/CD pipeline

3. Problem-Solving Stories (3-4 minutes)

"The project included intentional issues to test problem-solving skills. I documented 7+ issues and their solutions, with the most challenging being the ECS-RDS connectivity problem."

Key Issues Solved:

  • Database connection configuration
  • Environment variable management
  • Security group configurations
  • Terraform state conflicts
  • Container security improvements

4. Technical Deep Dive (5-6 minutes)

Be ready to explain:

  • Infrastructure as Code: Terraform modules and state management
  • Container Security: Non-root containers, minimal base images
  • CI/CD Pipeline: Automated testing, building, and deployment
  • Monitoring: CloudWatch logs and metrics
  • Security: IAM roles, security groups, VPC design

🚀 Live Demo Preparation

Primary Demo Flow

  1. Show the application running locally

    cd app/beer_catalog
poetry run python -m flask --app beer_catalog/app run --debug
curl http://localhost:5000/health
curl http://localhost:5000/beers

  2. Demonstrate Docker containerization

    docker build -t beer-catalog-app .
docker run -p 5000:5000 beer-catalog-app

  3. Show infrastructure in AWS Console

    • ECS cluster and service
    • RDS database
    • VPC and security groups
    • CloudWatch logs

  4. Walk through CI/CD pipeline

    • GitHub Actions workflow
    • Automated build and deploy
    • ECR image repository

Backup Demo Options

  • Code walkthrough: Explain key files and decisions
  • Screenshots: Show AWS resources and configurations
  • Documentation: Walk through README and troubleshooting guide

💬 Expected Questions & Answers

Technical Questions

Q: "Walk me through your architecture" A: "I built a containerized Flask app deployed on ECS Fargate. The app connects to PostgreSQL RDS in a private subnet, with all infrastructure managed by Terraform. Deployments are automated via GitHub Actions, and everything runs in a VPC with proper security groups."

Q: "What was the most challenging issue you solved?" A: "The ECS-RDS connectivity issue was challenging. The app was trying to connect to localhost instead of the RDS endpoint. I debugged this through CloudWatch logs and fixed it by properly configuring the DATABASE_URL environment variable in the ECS task definition."

Q: "How would you scale this architecture?" A: "I'd add an Application Load Balancer, implement auto-scaling based on CPU/memory, use read replicas for the database, and consider moving to Aurora Serverless. I'd also implement blue-green deployments for zero-downtime updates."

Q: "What security measures did you implement?" A: "I use IAM roles with least privilege, security groups to restrict traffic, RDS in private subnets, and non-root containers. I avoid hardcoded secrets and use environment variables for configuration."

Behavioral Questions

Q: "Tell me about a time you solved a complex technical problem" A: "In this project, I faced multiple infrastructure issues. The most complex was debugging the ECS-RDS connectivity problem. I systematically checked CloudWatch logs, verified security group configurations, and eventually found the issue was with environment variable configuration. This taught me the importance of systematic debugging and proper documentation."

Q: "How do you stay current with DevOps practices?" A: "I follow a structured learning approach, as outlined in my study plan. I focus on hands-on projects, official documentation, and community involvement. I'm actively working toward AWS and Terraform certifications."

Q: "What would you improve in your project?" A: "I'd add comprehensive monitoring with CloudWatch dashboards, implement secrets management with AWS Secrets Manager, add automated testing, and implement blue-green deployments. I'd also add infrastructure cost optimization and performance monitoring."

🎯 Interview Strategy

Opening (2 minutes)

  • Introduce yourself and your background
  • Mention your passion for DevOps and automation
  • Reference your study plan and systematic approach

Technical Discussion (8 minutes)

  • Walk through your project architecture
  • Demonstrate live components
  • Share problem-solving stories
  • Show your learning process

Q&A (5 minutes)

  • Answer technical questions confidently
  • Ask thoughtful questions about their tech stack
  • Show enthusiasm for the role and company

Closing (2 minutes)

  • Summarize your key strengths
  • Express interest in the role
  • Thank them for the opportunity

🚨 Common Pitfalls to Avoid

Technical

  • ❌ Don't memorize answers - understand the concepts
  • ❌ Don't rush through demos - explain your decisions
  • ❌ Don't ignore failures - show how you learned from them

Communication

  • ❌ Don't use jargon without explanation
  • ❌ Don't be defensive about challenges
  • ❌ Don't forget to ask questions about their environment

Preparation

  • ❌ Don't wait until the last minute to test demos
  • ❌ Don't rely on internet for live demos
  • ❌ Don't forget to prepare backup options

🎯 Success Indicators

Technical Competency

  • ✅ Can explain every component of your architecture
  • ✅ Understands the flow from code to production
  • ✅ Can troubleshoot common issues
  • ✅ Shows learning from challenges

Communication Skills

  • ✅ Presents technical concepts clearly
  • ✅ Demonstrates confidence in your solution
  • ✅ Answers questions thoughtfully
  • ✅ Shows enthusiasm for the work

Problem-Solving

  • ✅ Can discuss issues found and solutions
  • ✅ Understands debugging process
  • ✅ Can explain trade-offs and decisions
  • ✅ Shows systematic approach to problems

🚀 Final Reminders

Day Before Interview

  • Test all demos and backups
  • Review key technical concepts
  • Prepare your workspace
  • Get good sleep

30 Minutes Before

  • Test Google Meet setup
  • Have all tabs and tools ready
  • Take deep breaths and stay calm
  • Remember: You've built something impressive!

During Interview

  • Show confidence in your abilities
  • Be honest about challenges faced
  • Demonstrate problem-solving skills
  • Show enthusiasm for DevOps
  • Ask thoughtful questions

🎯 Remember: You've Got This!

Your project demonstrates:

  • Real-world DevOps skills
  • Problem-solving ability
  • Infrastructure knowledge
  • Automation expertise
  • Security awareness
  • Documentation skills

You've built a complete, production-ready DevOps pipeline. Be confident in your abilities and show your passion for the work!

Good luck! 🎯