ML Engineer

Building, training, and deploying machine learning models to production

ML & AI Engineering Junior Middle Senior Lead / Staff Principal
Full Matrix Career Track PDF
58 skills
5 levels
125 mandatory
285 requirements

ML Engineer is a role in the ML & AI Engineering family. It has 58 skills across 5 levels (from Junior to Principal). 125 skills are mandatory. Key domains: Programming Fundamentals, Backend Development, Database Management.

Technology Stack

Junior Python 3.11+, scikit-learn, pandas/numpy, Jupyter, PyTorch/TensorFlow basics, SQL, Git
Middle Python 3.12+, PyTorch/TensorFlow, XGBoost/LightGBM/CatBoost, MLflow, Airflow, Feature store basics, Docker, DVC
Senior PyTorch advanced, ONNX/TensorRT, Triton Inference Server, Kubeflow/MLflow, Spark ML, Ray, Kubernetes, Prometheus/Grafana
Lead / Staff ML Platform (Kubeflow/MLflow/Vertex AI), Feature Store (Feast), Model Registry, A/B testing platform, GPU cluster management
Principal Enterprise AI architecture, LLM platform, Multi-model orchestration, Cost optimization (GPU), Research strategy

Focus by Level

Junior

Training models using existing pipelines. Feature engineering. Model validation. Preparing datasets. Working with Jupyter notebooks.

Middle

Designing ML pipelines. Model selection and tuning. A/B testing models. Deploying models to production. Feature store.

Senior

ML systems architecture. Inference optimization (ONNX, TensorRT). Designing real-time ML. Researching new approaches. Mentoring.

Lead / Staff

ML platform strategy. MLOps infrastructure. Coordinating ML and backend. Experimentation standards. ML team roadmap.

Principal

Company AI strategy. LLM integration. ML at scale. Research agenda. Publications and talks.

Skill Matrix

58 skills × 5 levels. Click on a cell for details.

A Awareness W Working V Advanced E Expert

AI-Assisted Development

4 skills
Skills Jun Mid Sen Lead Princ
GitHub Copilot A A W A A
Cursor IDE A W A A
ChatGPT / Claude A A W A A
Prompt Engineering for Code A A W A A

API & Integration

5 skills
Skills Jun Mid Sen Lead Princ
REST API Design A W A A E
GraphQL Design A W A E E
WebSocket API Design A W A E E
gRPC & Protocol Buffers A A W A A
API Documentation A W A E E

Architecture & System Design

1 skills
Skills Jun Mid Sen Lead Princ
System Design Fundamentals A W A E E

Backend Development

4 skills
Skills Jun Mid Sen Lead Princ
Python Web Frameworks A W A A E
Apache Kafka A A W A A
Redis A A W A A
Task Queues A A W A A

Cloud & Infrastructure

5 skills
Skills Jun Mid Sen Lead Princ
Docker A W A A E
Kubernetes Core A W A A E
Terraform A W A E E
AWS A W A A E
Network Fundamentals A W A E E

Data Engineering

4 skills
Skills Jun Mid Sen Lead Princ
Apache Spark A W A E E
Pandas / Polars A W A E E
SQL-based ETL A W A E E
Data Quality A W A E E

Database Management

4 skills
Skills Jun Mid Sen Lead Princ
PostgreSQL A W A A E
Database Indexing A A W A A
Query Optimization A A W A A
Data Modeling & Schema Design A W A E E

DevOps & CI/CD

1 skills
Skills Jun Mid Sen Lead Princ
GitHub Actions / GitLab CI A W A A E

Machine Learning & AI

9 skills
Skills Jun Mid Sen Lead Princ
Classical ML (scikit-learn) A W A E E
Gradient Boosting A W A E E
PyTorch A W A E E
MLflow A W A E E
Feature Stores A W A E E
Model Serving A W A E E
Experiment Tracking A W A E E
ML Pipelines A W A E E
Model Monitoring A W A E E

Observability & Monitoring

4 skills
Skills Jun Mid Sen Lead Princ
Structured Logging W A E
Prometheus & Grafana A W A
OpenTelemetry A W A E E
SLI / SLO / SLA A W A E E

Programming Fundamentals

9 skills
Skills Jun Mid Sen Lead Princ
Algorithms & Complexity W W A A E
Data Structures W W A A E
OOP & SOLID Principles W W A A E
Design Patterns W W A A E
Multithreading W W A A E
Async Programming W W A A E
Code Quality & Refactoring W W A A E
Type Safety & Type Systems A W A E E
Memory Management A W A E E

Security

3 skills
Skills Jun Mid Sen Lead Princ
OWASP & Application Security A W A E E
Secure Coding Practices A W A E E
JWT / OAuth2 / OIDC A W A E E

Testing & QA

3 skills
Skills Jun Mid Sen Lead Princ
Unit Testing A W A A E
Integration Testing A W A A E
E2E Testing A W A E E

Version Control & Collaboration

2 skills
Skills Jun Mid Sen Lead Princ
Git Advanced A W A A E
Code Review A W A A E

FAQ

What skills are needed for the ML Engineer role?

The ML Engineer role requires 58 skills, of which 125 are mandatory. Skills are distributed across 5 levels: from Junior to Principal. See full matrix.

How to advance to the next level in the ML Engineer role?

Use the Grade Calculator to assess your current level and get personalized recommendations. The system will show which skills need to be developed for the next level.

What tech stack is used in the ML Engineer role?

The stack includes 5 technologies at different levels. Python 3.11+, scikit-learn, pandas/numpy, Jupyter, PyTorch/TensorFlow basics, SQL, Git, Python 3.12+, PyTorch/TensorFlow, XGBoost/LightGBM/CatBoost, MLflow, Airflow, Feature store basics, Docker, DVC, PyTorch advanced, ONNX/TensorRT, Triton Inference Server, Kubeflow/MLflow, Spark ML, Ray, Kubernetes, Prometheus/Grafana...

How does the community define requirements for the ML Engineer role?

Role requirements are shaped by the community through a proposal system. Any member can suggest changes that go through voting and expert review.

Community

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