Advanced~3h
Context Engineering in LLM CoreInterview Readiness Check
What goes into the context window and in what order — the most underrated skill in 2026. Context rot, lost-in-the-middle, the difference between RAG and 'just shove everything in', dynamic context construction..
context engineeringcontext rotlost in the middleRAG vs contextdynamic promptcontext window
Learning path
Try a sample question
Your application passes entire codebases (~80K tokens) to a model with a 128K context window. Users report that the model ignores relevant functions defined early in the file and focuses only on code near the end of the prompt. What well-documented phenomenon explains this failure?
A.Positional encoding degradation, where RoPE embeddings become inaccurate beyond the training context length, causing random attention patterns throughout
B.Context window overflow, where the model silently truncates input beyond 64K tokens regardless of the advertised limit
C.The 'lost-in-the-middle' effect, where transformer models attend poorly to information in the middle of long contexts, with attention peaking at the beginning and end of the input
D.Token budget misallocation, where the model reserves too many KV cache slots for system prompt tokens, leaving insufficient attention capacity for user content
Sign up free to take the full check and see the answer with an explanation.
What this module tests
- Conceptual understanding of context engineering fundamentals
- Trade-offs and design decisions in real system scenarios
- context engineering and context rot — applied knowledge
- Interview-style reasoning and explanation quality
Free to start
Take the Context Engineering check →
10 questions · Dimension scoring · AI coach feedback · Shareable result
Test your knowledge — free →No credit card · Takes 10–15 min
Frequently asked questions
- What does the Context Engineering check test?
- The check covers what goes into the context window and in what order — the most underrated skill in 2026. context rot, lost-in-the-middle, the difference between rag and 'just shove everything in', dynamic context construction.. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.
- What keywords should I know for Context Engineering?
- Key concepts include: context engineering, context rot, lost in the middle, RAG vs context, dynamic prompt, context window. These frequently appear in llm core interviews at product and infrastructure companies.
- How many questions are in the check?
- Each check has 10 questions — a mix of MCQ and short-answer. You get scored by dimension (e.g., scalability, consistency) so you know exactly where to focus.
- How long does it take to study Context Engineering?
- Most engineers spend around 3 hours on this module. The check itself takes about 10–15 minutes. You can retake it up to 3 times per day.
- What prerequisite knowledge do I need before Context Engineering?
- Context Engineering builds on Tokens & the Context Window and Prompt Engineering — Opinionated. Complete those first for the best results.
- Is context engineering, context rot, lost in the middle covered?
- Yes. The Context Engineering module covers context engineering, context rot, lost in the middle among other key concepts. The check includes questions that reflect real llm core interview patterns.