What a Mid-level } should know

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

This page lists what a Mid-level } 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 Mid-level Full role matrix

Core skills for a Mid-level

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 Senior

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

Algorithms & Complexity: Working → Advanced · becomes core
Apache Kafka: Working → Advanced · becomes core
ArgoCD: Working → Advanced · becomes core
Async Programming: Working → Advanced · becomes core
AWS: Working → Advanced · becomes core
Code Quality & Refactoring: Working → Advanced · becomes core
Code Review: Working → Advanced · becomes core
Container Security Scanning: Working → Advanced · becomes core
Custom Business Metrics: Working → Advanced · becomes core
Data Structures: Working → Advanced · becomes core

See the Senior page →

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