What a Junior } should know

0 core skills, 56 in total. Expectations per skill, and what changes at the next level.

This page lists what a Junior } is expected to know and do, skill by skill. Core skills are the ones a manager and peers assess in a review cycle; the rest count only in self-assessment. Main areas: .

0core skills

56additional skills

0skill areas

0%at Advanced or Expert

Assess myself as Junior Full role matrix

Core skills for a Junior

Grouped by area. The label on the right is the expected depth: Awareness, Working, Advanced or Expert.

Additional skills

Not assessed by the team, but part of the self-assessment and the development plan.

Algorithms & Complexity Apache Kafka API Documentation ArgoCD Async Programming AWS ChatGPT / Claude Code Quality & Refactoring Code Review Container Security Scanning Cursor IDE Custom Business Metrics Data Structures Database Indexing Design Patterns Docker E2E Testing Experiment Tracking Feature Stores Git Advanced GitHub Actions / GitLab CI GitHub Copilot GitLab CI/CD Advanced GraphQL Design gRPC & Protocol Buffers Helm Integration Testing JWT / OAuth2 / OIDC Kubernetes Advanced Kubernetes Core Load Testing ML Pipelines MLflow Model Monitoring Model Serving Multithreading Network Fundamentals OOP & SOLID Principles OpenTelemetry OWASP & Application Security PostgreSQL Prometheus & Grafana Prompt Engineering for Code Python Web Frameworks Query Optimization Redis REST API Design S3 / Object Storage Secure Coding Practices SLI / SLO / SLA Structured Logging System Design Fundamentals Task Queues Terraform Type Safety & Type Systems Unit Testing

What changes at Mid-level

56 skills get a higher expectation or become core when moving from Junior to Mid-level. The biggest jumps first.

Algorithms & Complexity: Awareness → Working
Apache Kafka: Awareness → Working
API Documentation: Awareness → Working
ArgoCD: Awareness → Working
Async Programming: Awareness → Working
AWS: Awareness → Working
ChatGPT / Claude: Awareness → Working
Code Quality & Refactoring: Awareness → Working
Code Review: Awareness → Working
Container Security Scanning: Awareness → Working

See the Mid-level page →

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} in the open competency matrix: 56 skills across 5 levels. The matrix is free for individuals and stays free.