Hands-on LabJunior
Fix Node.js + PostgreSQL Docker Compose
Verify backend developers can debug real Docker Compose issues — not just run tutorials.
Debug and fix a broken Docker Compose setup connecting a Node.js API to a PostgreSQL database. Resolve networking, environment configuration, and container orchestration issues to restore full-stack connectivity.
⏱️ 55 min
📝 2 exercises
⭐ 5/5
Eliminate false positives. 100% verified skills.
Real Environment: Node.js, PostgreSQL, Docker Compose, Linux CLI
The Stack
Production-Grade Environment
Docker Compose
Multi-container orchestration tool used to define and run the Node.js and PostgreSQL services.
Node.js
PostgreSQL
Linux
Role Relevancy
How this lab maps to your role
High Match92%
Backend Developer
Core
High Match85%
DevOps Engineer
Core
Good Match65%
Full-Stack Developer
Relevant
Good Match55%
Site Reliability Engineer
Relevant
Fair Match40%
Software Engineer
Supplementary
Technical Assessment Guide
Technical Assessment (Fix Node.js + PostgreSQL Docker Compose)
When to use this lab
- ✓Hiring Backend DevelopersValidates ability to troubleshoot multi-container setups and restore database connectivity in a Docker Compose environment.
- ✓Screening DevOps EngineersTests proficiency in Docker Compose networking, environment variables, and container orchestration debugging.
- ✓Evaluating Debugging SkillsAssesses real-world troubleshooting capabilities when faced with broken service-to-service connectivity.
Skills Evaluated
Docker Compose DebuggingService NetworkingEnvironment ConfigurationDatabase Connectivity
Who is this for?
Built for Both Sides
Corporate
For Recruiters & Hiring Managers
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Individual
For Professionals & Learners
- Build real portfolio experience, not toy projects
- Practice in safe, real cloud environments
- Earn verifiable credentials to share on LinkedIn
- Stand out in technical interviews with proof of skills
Common Questions
Frequently Asked Questions
What issues does this Docker Compose lab present?
The lab provides a broken Docker Compose setup where a Node.js API fails to connect to PostgreSQL. You must diagnose and fix networking, environment variable, and service configuration issues to restore connectivity.
How long does the Node.js + PostgreSQL debugging lab take?
The lab is designed for 55 minutes. This includes reading the existing setup, identifying bugs, fixing configuration files, and validating that the API successfully connects to the database.
What skill level is required for this lab?
This lab targets junior-level engineers who have basic experience with Docker Compose, Node.js, and PostgreSQL. You should understand container networking and environment variable configuration.
How is my work validated in this lab?
Automated validation commands check that both containers are running, the Node.js API responds on the correct port, and the database connection is successfully established with proper data retrieval.
Can I modify the Node.js application code?
The primary focus is on fixing the Docker Compose configuration and environment setup. You should examine all provided files including docker-compose.yml, Dockerfile, and environment configurations.
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