Concepts
Mental models and definitions that make the code understandable.
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Prompt Injection Mitigation
Prompt Injection Mitigation governs injection defense, shaping system behavior under specific failure modes and workloads.
Property-Based Testing
Property-based testing states universal invariants of the code and lets the framework search for a counterexample input, finding edge cases the example-based tester did not think to write.
Published Language Pattern
A published language is a translation language shared between bounded contexts as a documented, versioned standard, so that integration goes through one well-defined schema instead of N pairwise.
Published Language Interface
Published Language Interface governs integration schema, shaping system behavior under specific failure modes and workloads.
HTTP/2 Push Promise Deprecation
HTTP/2 push promise let the server send a response before the client asked, but it was widely misimplemented and is being deprecated in favor of 103 early hints and preload links.
Query Plan Cache
A query plan cache stores the compiled execution plan for a parameterized query, so the optimizer cost is paid once and subsequent executions reuse the plan, unless parameter values warrant.
QUIC Migration Strategy
QUIC Migration Strategy governs connection migration, shaping system behavior under specific failure modes and workloads.
Quorum Reads vs Writes
Quorum Reads vs Writes governs quorum intersection for consistency, shaping system behavior under specific failure modes and workloads.
RAG Citation Faithfulness
RAG Citation Faithfulness governs citation accuracy, shaping system behavior under specific failure modes and workloads.
RAG Grounding and Citation
RAG grounding retrieves relevant documents and constrains the model to answer from them with citations, so the answer is attributable to a source the user can verify rather than a hallucination.
RAG Grounding Evaluation
RAG Grounding Evaluation governs answer faithfulness, shaping system behavior under specific failure modes and workloads.
Reactor vs Proactor
Reactor vs Proactor governs event dispatch patterns, shaping system behavior under specific failure modes and workloads.
Read Quorum Sizing
Read Quorum Sizing governs read latency versus consistency, shaping system behavior under specific failure modes and workloads.
Read Repair Mechanism
Read Repair Mechanism governs stale replica detection on read, shaping system behavior under specific failure modes and workloads.
Render Blocking Audit
Render Blocking Audit governs blocking resource analysis, shaping system behavior under specific failure modes and workloads.
Render-Blocking Resource Elimination
Render-blocking resource elimination defers or removes scripts and stylesheets that block the first paint, so the browser renders the HTML without waiting for resources that are not on the.
Reproducible Supply Chain
Reproducible Supply Chain governs build verification, shaping system behavior under specific failure modes and workloads.
Request Budget Shaping
Request Budget Shaping governs admission control via budget, shaping system behavior under specific failure modes and workloads.
Resumability Streaming
Resumability Streaming governs no hydration needed, shaping system behavior under specific failure modes and workloads.
Retry Flaky Strategy
Retry Flaky Strategy governs flaky test handling, shaping system behavior under specific failure modes and workloads.
Rollback Automation
Rollback automation makes reverting to the previous version a single command or an automatic trigger, so the mean time to recover is seconds, not the minutes a manual rollback takes under stress.
Runbook Automation
Runbook automation encodes the diagnostic and recovery steps of a known failure as executable automation, so the on-call resolves by running the runbook rather than reading it and typing commands.
Saga Choreography Design
Saga Choreography Design governs event-driven saga, shaping system behavior under specific failure modes and workloads.
Saga Orchestration Design
Saga Orchestration Design governs centralized saga, shaping system behavior under specific failure modes and workloads.
Sampling Head-Based
Sampling Head-Based governs pre-hoc sampling, shaping system behavior under specific failure modes and workloads.
Sampling Tail-Based
Sampling Tail-Based governs post-hoc sampling, shaping system behavior under specific failure modes and workloads.
Schema Migration Safety
Schema Migration Safety governs migration validation, shaping system behavior under specific failure modes and workloads.
Scope-Bound Cancellation
Scope-Bound Cancellation governs cancellation propagation, shaping system behavior under specific failure modes and workloads.
Secret Detection CI
Secret Detection CI governs pipeline secret scanning, shaping system behavior under specific failure modes and workloads.
Secret Scan Pre-commit
Secret Scan Pre-commit governs leak prevention at commit, shaping system behavior under specific failure modes and workloads.
Select Statement Go
Select Statement Go governs channel multiplexing, shaping system behavior under specific failure modes and workloads.
Selective Test Rerun
Selective Test Rerun governs CI acceleration, shaping system behavior under specific failure modes and workloads.
Semantic Search Hybrid
Semantic Search Hybrid governs keyword vector fusion, shaping system behavior under specific failure modes and workloads.
Session Resumption Tuning
Session Resumption Tuning governs handshake avoidance, shaping system behavior under specific failure modes and workloads.
Shadow Index Build
Shadow Index Build governs background indexing, shaping system behavior under specific failure modes and workloads.
Shadow Traffic Testing
Shadow traffic testing replays production requests against a candidate build without returning its responses, so the candidate is tested under real load with zero user impact.
Shared Kernel Pattern
Shared Kernel Pattern governs shared model subset, shaping system behavior under specific failure modes and workloads.
Sigstore Attestation
Sigstore Attestation governs keyless signing, shaping system behavior under specific failure modes and workloads.
SIMD Vectorization
SIMD vectorization applies one instruction to multiple data elements, so a loop that processes four floats per iteration does one quarter the iterations and one quarter the loop overhead.
SLO-Aware Canary
SLO-Aware Canary governs canary evaluation via SLO, shaping system behavior under specific failure modes and workloads.
SLO-Based Rollback
SLO-Based Rollback governs automatic rollback on budget breach, shaping system behavior under specific failure modes and workloads.
SLO-Derived Alerts
SLO-Derived Alerts governs error budget burn signaling, shaping system behavior under specific failure modes and workloads.
SLO Error Budget Mapping
SLO error budget mapping converts the reliability target into a concrete budget of allowed failures per window, so "99.9%" becomes "43 minutes per month" that a team can spend and track.
SLSA Build Provenance
SLSA Build Provenance governs build integrity evidence, shaping system behavior under specific failure modes and workloads.
Snapshot Diff Review
Snapshot Diff Review governs change review for snapshots, shaping system behavior under specific failure modes and workloads.
Snapshot Pinning
Snapshot Pinning governs snapshot stability over time, shaping system behavior under specific failure modes and workloads.
Snapshot Testing
Snapshot testing records the output of a function and fails on change, so a deliberate output update is a visible, reviewed diff rather than a silent behavior shift.
Span Attribute Conventions
Span Attribute Conventions governs semantic attributes, shaping system behavior under specific failure modes and workloads.
Span Context Propagation
Span context propagation carries the trace and span IDs across process boundaries — HTTP headers, message metadata — so a trace that spans four services is one connected trace, not four orphan.
Specification Composition
The specification pattern represents a business rule as a composable predicate object, so that rules combine with and/or/not into complex criteria without the query logic duplicating for each.
Stale-While-Revalidate
Stale-while-revalidate serves a stale cache entry immediately while refreshing in the background, so the user sees instant response and the next request gets fresh data without a stampede.
Startup Time Budget
A startup time budget caps the time from process launch to serving traffic, so the deployment, autoscale, and crash-loop do not amplify a slow init into an outage.
Strangler Fig Migration
Strangler Fig Migration governs legacy replacement, shaping system behavior under specific failure modes and workloads.
Structured Concurrency Design
Structured Concurrency Design governs scope-bound tasks, shaping system behavior under specific failure modes and workloads.
Subgrid Layout
Subgrid Layout governs grid inheritance, shaping system behavior under specific failure modes and workloads.
Table-Driven Discovery
Table-Driven Discovery governs case enumeration, shaping system behavior under specific failure modes and workloads.
Table Rewrite Avoidance
Table Rewrite Avoidance governs rewrite prevention, shaping system behavior under specific failure modes and workloads.
TBT Blocking Budget
TBT Blocking Budget governs main thread blocking, shaping system behavior under specific failure modes and workloads.
TCP Fast Open
TCP Fast Open governs handshake reduction, shaping system behavior under specific failure modes and workloads.
Telemetry Pipeline Architecture
A telemetry pipeline architecture collects, processes, and routes telemetry from every source to every sink, so instrumentation is decoupled from the backend and a new sink does not require.
Test Coverage Gates Design
Test Coverage Gates Design governs coverage enforcement, shaping system behavior under specific failure modes and workloads.
Test Data Mother
Test Data Mother governs canonical test data source, shaping system behavior under specific failure modes and workloads.
Test Impact Graph
Test Impact Graph governs selective rerun analysis, shaping system behavior under specific failure modes and workloads.
Test Pyramid Pruning
Test Pyramid Pruning governs test suite optimization, shaping system behavior under specific failure modes and workloads.
Test Quarantine Policy
Test Quarantine Policy governs flaky test management, shaping system behavior under specific failure modes and workloads.
TLS 1.3 Early Data
TLS 1.3 Early Data governs 0-RTT transmission, shaping system behavior under specific failure modes and workloads.
Token Binding Protocol
Token Binding Protocol governs token possession proof, shaping system behavior under specific failure modes and workloads.
Tool Calling Safety
Tool Calling Safety governs function call validation, shaping system behavior under specific failure modes and workloads.
Trace Correlation IDs
Trace correlation IDs give each request a unique ID that every log, metric, and span carries, so a single failed request is found across every store by one ID without manual join.
Trace Correlation Propagation
Trace Correlation Propagation governs cross-service context, shaping system behavior under specific failure modes and workloads.
Trace Exemplar Linking
Trace Exemplar Linking governs slow request diagnosis, shaping system behavior under specific failure modes and workloads.
Trace Sampling Policy
A trace sampling policy decides which traces to keep within a budget — head sampling by probability, tail sampling by attributes — so the retained set is informative and affordable.
Transfer-Encoding Streaming
Transfer-Encoding chunked streams a response of unknown length by framing each chunk with its size, so the server can begin sending before the total is computed.
Trunk-Based Quality Gates
Trunk-based quality gates keep the main branch deployable by running the full quality pipeline on every push, so a broken trunk is caught at the push that broke it, not at a later merge.
Typosquat Detection
Typosquat Detection governs package name confusion, shaping system behavior under specific failure modes and workloads.
Vacuum Tuning Strategy
Vacuum Tuning Strategy governs bloat management, shaping system behavior under specific failure modes and workloads.
Vary Header Caching
The Vary header tells the cache that the response varies by the listed request headers, so two clients with different Accept-Encoding get separate cache entries rather than a wrong shared one.
Vector Index Tuning
Vector Index Tuning governs ANN accuracy speed, shaping system behavior under specific failure modes and workloads.
View Transition Names
View Transition Names governs element matching, shaping system behavior under specific failure modes and workloads.
View Transitions API
View Transitions API governs SPA transitions, shaping system behavior under specific failure modes and workloads.
Viewport Units and Dynamic Viewport
Viewport units size elements relative to the viewport, and the dynamic viewport units handle the mobile browser chrome that appears and disappears, so the layout does not jump when the URL bar.
Virtual Thread Scaling
Virtual Thread Scaling governs lightweight threads, shaping system behavior under specific failure modes and workloads.
Web Vitals Thresholds
Web Vitals Thresholds governs user experience metrics, shaping system behavior under specific failure modes and workloads.
Web Worker Offloading
Web worker offloading moves CPU-heavy work off the main thread into a worker, so the UI stays responsive while the computation runs in parallel and posts the result back.
Work Stealing Scheduler
A work stealing scheduler gives each worker a local deque and lets idle workers steal from the back of busy ones, balancing load with cache-friendly local pops and rare remote steals.
Write Quorum Sizing
Write Quorum Sizing governs write durability versus latency, shaping system behavior under specific failure modes and workloads.
Zero-Copy Transfer
Zero-copy transfer moves data between file descriptors without copying through user space, so a large file send costs no CPU copy and no user-space buffer allocation.
Zero-Downtime Backfill
Zero-Downtime Backfill governs data population without locks, shaping system behavior under specific failure modes and workloads.
Zero-Downtime Deployment
Zero-downtime deployment rolls out a new version without taking the service offline, by running old and new side by side and draining the old as the new takes traffic.
0-RTT Replay Protection
0-RTT Replay Protection governs early data safety, shaping system behavior under specific failure modes and workloads.
Approximate Nearest Neighbor
ANN indexes return almost the exact nearest neighbours much faster by pruning the search space for a controlled, measurable recall loss.
Bazel
Bazel is a build system that models code and dependencies as a graph of hermetic targets and rebuilds only what changed.
Dynamic Application Security Testing
DAST probes a running application from the outside, finding exploitable flaws in the real deployed configuration.
Data Contract
A data contract is an explicit, testable agreement on the schema, semantics, and quality of data exchanged between a producer and its consumers.
Data Freshness
Data freshness measures how current a dataset is: the lag between when the world changed and when the consumer sees it.
Embeddings
Embeddings map discrete items to dense vectors so that geometric distance in the vector space reflects semantic similarity.
Esbuild
Esbuild is an extremely fast JavaScript bundler and minifier, written in Go, that parallelises parsing and avoids intermediate ASTs.
ETL Versus ELT
ETL transforms data before loading into the warehouse; ELT loads raw data first and transforms it inside the warehouse using its compute.
Event Loop
An event loop drives asynchronous work by repeatedly taking ready callbacks or events and running them to completion on one thread.
Feature Store
A feature store is the shared layer that computes, stores, and serves machine-learning features consistently to both training and inference.