Learn the work behind Data, AI & Forward Deployed Engineering
Practical explanations, career decisions and reproducible workflows. Read the reasoning, inspect the evidence and follow the next skill into a real programme.
Test cross-tenant cache isolation
A response cache can bypass controls that retrieval and tools enforce correctly. Semantic similarity makes this worse: two tenants may ask equivalent questions while having different permitted evidence.
Test tenant isolation in a retrieval tool
An agent may invent or receive a valid document ID from another tenant. The retrieval service must enforce identity scope before reading or returning content.
Text embeddings: evaluate similarity against labelled pairs
An embedding maps text to a vector. Cosine similarity then measures angle, not task relevance. Before using it for deduplication, retrieval or clustering, evaluate labelled pairs that represent what “similar” means for t
Text features: control vocabulary and fit boundaries
TF-IDF learns a vocabulary and document-frequency weights. Fitting on all documents before a split imports test-language statistics into the representation, even when no target is used.
Threat-model an AI application from data flows
A list of AI risks becomes actionable only when it is tied to the application’s assets, identities, boundaries and operations. Draw the real data flows before selecting mitigations.
Threat-model tool misuse and data exfiltration paths
An agent connects untrusted language to capabilities. Threat modelling must follow the complete path from user and retrieved content through model output, tool arguments, credentials, network destinations and stored resu
Threshold selection with unequal error costs
A single false-negative cost assumes every missed event has the same consequence. Many decisions are heterogeneous: missing a high-amount transaction may matter more than missing a small one, while review consumes a roug
Time-aware validation for a changing business process
A time-aware evaluation should recreate what could have been known when a model was fitted and used. Sorting by prediction date is necessary for many forecasting settings, but it does not ensure that the training labels
Time-series train-test splits: reproduce a real forecast date
A time-series split should reproduce a decision that could have happened on a named date. Randomly shuffling monthly demand mixes later conditions into earlier training data. The resulting score answers how well a model
Tokenization choices that change a text model
Tokenization decides which patterns a text model can represent. A word tokenizer may split sign-in into sign and in, while character n-grams preserve fragments across punctuation and spelling variants. The choice changes
Tokens and context windows: budget a real document task
A context window is shared space. System instructions, conversation history, retrieved evidence, tool schemas and generated output all consume it. Sending a document that fits by itself can still overflow once the applic
Tool errors: distinguish retryable and permanent failures
Retrying every exception wastes time and can repeat writes. Error contracts should distinguish transient availability from invalid requests, denied authority and business rejection.
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