_Article

Applied AI Engineering Notes

May 1, 2026

Miguel Armengol

These documents are self-study notes compiled for personal learning in applied artificial intelligence. The material is intentionally crude, austere, and simple. I wrote them for my own reference, but glad if somebody else finds them useful.

Track 1 — Product Strategy for AI

Module 1 — AI Decision Framework

1.1. When NOT to Use AI

1.1.1 Deterministic logic suffices
1.1.2 Tail risk too high (legal, safety)
1.1.3 Insufficient or poor-quality data

1.2. Identifying High-Leverage AI Opportunities

1.2.1 Repetitive cognitive work
1.2.2 Bottleneck workflows
1.2.3 Data-rich, judgment-light tasks

1.3. Deterministic Systems vs AI Systems

1.3.1 When determinism wins (correctness, audit)
1.3.2 When AI wins (open-ended, ambiguous input)
1.3.3 Hybrid: deterministic shell + AI step

1.4. Build vs Buy vs Embed AI

1.4.1 Buy when commodity
1.4.2 Build when defensibility lives in workflow
1.4.3 Vendor lock-in & switching cost

1.5. AI Feasibility vs Business Value

1.5.1 Feasibility axis: data, latency, accuracy, cost
1.5.2 Value axis: revenue, cost saved, risk reduced
1.5.3 Prioritization matrix

Module 2 — AI-Native Product Design

2.1. UX for AI Products

2.1.1 Input affordances (text, voice, file)
2.1.2 Output presentation (streaming, structured)
2.1.3 Error and retry states

2.2. AI-Native Product Design

2.2.1 Build from AI primitives, not retrofit
2.2.2 Conversational vs task-oriented surfaces
2.2.3 Memory & continuity across sessions

2.3. Designing Around Uncertainty

2.3.1 Surfacing confidence
2.3.2 Retraction & correction UX
2.3.3 Source attribution

2.4. Latency, Feedback, and User Perception

2.4.1 Streaming to mask wait time
2.4.2 "Thinking" indicators with substance
2.4.3 Latency budgets per surface

2.5. Invisible AI vs Explicit AI UX

2.5.1 Ambient AI (autocomplete, ranking)
2.5.2 Explicit AI (chat, agent)
2.5.3 When to disclose AI involvement

Module 3 — Trust & Human Interaction

3.1. Human Trust Models

3.1.1 Calibration: confidence vs accuracy
3.1.2 Over-trust (automation bias)
3.1.3 Under-trust (algorithm aversion)

3.2. Confirmation UX

3.2.1 Reversibility ladder
3.2.2 Blast radius before approval
3.2.3 Batch vs per-action confirmation

3.3. Human-in-the-Loop Design

3.3.1 Review-queue patterns
3.3.2 Sampling strategies for review
3.3.3 Active-learning loops

3.4. Escalation Paths

3.4.1 Confidence-based handoff
3.4.2 Human fallback for failure
3.4.3 Context-logging for the human

3.5. Permission Boundaries and User Control

3.5.1 Per-action vs blanket consent
3.5.2 Scoped credentials per agent
3.5.3 Kill switch & global pause

Module 4 — Workflow Transformation

4.1. Workflow Redesign

4.1.1 Map current process before redesign
4.1.2 Identify decision points vs execution
4.1.3 Eliminate steps before automating

4.2. Replacing vs Assisting Human Work

4.2.1 Augmentation: speed and quality lift
4.2.2 Automation: full task removal
4.2.3 Hybrid: AI drafts, human approves

4.3. Operational Bottlenecks and AI Leverage

4.3.1 Find the queue with the longest wait
4.3.2 Convert serial work to parallel
4.3.3 Throughput per FTE before/after

4.4. Process Decomposition for AI Integration

4.4.1 Atomic-task vs end-to-end automation
4.4.2 Tool-callable subtasks
4.4.3 Idempotent units of work

4.5. Organizational Readiness

4.5.1 Enterprise AI readiness
4.5.2 Data hygiene baseline
4.5.3 Change capacity & fatigue
4.5.4 Sponsor & champion presence

Module 5 — Business Models & Economics

5.1. ROI Models

5.1.1 Cost per task before/after
5.1.2 Quality lift (revenue, retention)
5.1.3 Substitution rate (% of human work replaced)

5.2. Pricing AI Products

5.2.1 Seat-based
5.2.2 Usage-based (tokens, calls)
5.2.3 Outcome-based

5.3. Cost Structures of AI Products

5.3.1 Variable cost per call (model COGS)
5.3.2 Fixed inference infra
5.3.3 Training & eval costs

5.4. Usage-Based Pricing vs Seat-Based Pricing

5.4.1 Predictability for the customer
5.4.2 Margin protection for the vendor
5.4.3 Incentive alignment with customer value

5.5. Margin Compression from Model Costs

5.5.1 COGS scales with usage
5.5.2 Caching, distillation, smaller models
5.5.3 Self-hosted alternatives

Module 6 — Enterprise Adoption Strategy

6.1. Adoption Barriers

6.1.1 Trust & accuracy concerns
6.1.2 IT / security gatekeeping
6.1.3 Legal & compliance review

6.2. Internal Adoption Strategy

6.2.1 Pilot-team selection
6.2.2 Champion network
6.2.3 Expansion playbook

6.3. Change Management for AI Systems

6.3.1 Training & enablement
6.3.2 Incentive alignment
6.3.3 Sunsetting old workflows

6.4. Stakeholder Alignment

6.4.1 Exec sponsorship
6.4.2 IT / security partnership
6.4.3 Operations & frontline buy-in

6.5. Executive Buy-In vs Operator Buy-In

6.5.1 Top-down narrative vs bottom-up traction
6.5.2 Operator veto power
6.5.3 Sequencing the two

Track 2 — Enterprise AI Architectures

Module 1 — System Types (Use Cases)

1.1. Retrieval & RAG Systems

1.1.1 Data Ingestion & Retrieval Pipeline
1.1.2 Document Ingestion Pipeline (PDFs, Tables, OCR)
1.1.3 Hybrid Search (Semantic + Keyword)
1.1.4 Vector Databases & Indexing
1.1.5 Reranking & Cross-Encoders
1.1.6 Context Construction & Grounding
1.1.7 Retrieval Evaluation (RAGAS, TruLens)

1.2. Traditional ML Systems

1.2.1 Supervised learning
1.2.2 Feature engineering
1.2.3 Training pipelines
1.2.4 Model serving
1.2.5 Retraining loops
1.2.6 Model monitoring
1.2.7 Fraud
1.2.8 Churn
1.2.9 Lead scoring
1.2.10 Forecasting
1.2.11 Anomaly detection

1.3. Fine-Tuning Systems

1.3.1 Supervised fine-tuning (SFT)
1.3.2 Preference optimization
1.3.3 Evaluation
1.3.4 Dataset quality
1.3.5 Labeling systems

1.4. Workflow / Agent Systems

1.4.1 State machines
1.4.2 Workflow engines
1.4.3 Retries
1.4.4 Idempotency
1.4.5 Approval gates
1.4.6 Tool execution
1.4.7 Auditability
1.4.8 Failure recovery
1.4.9 XState
1.4.10 Temporal

1.5. Recommendation Systems

1.5.1 Ranking models
1.5.2 Feedback loops
1.5.3 Candidate generation
1.5.4 Relevance systems

1.6. Knowledge Graph Systems

1.6.1 Entity modeling
1.6.2 Graph queries
1.6.3 Graph enrichment
1.6.4 Compliance applications

1.7. Central AI Platform

1.7.1 Ingestion
1.7.2 Permissions
1.7.3 Model routing
1.7.4 Observability
1.7.5 Evaluation
1.7.6 Governance
1.7.7 Tool access
1.7.8 Model abstraction

Module 2 — Deployment & Compliance Models

2.1. Isolation & Deployment Tiers

2.1.1 Cloud + External APIs (API-first)
2.1.2 VPC + Private Endpoints (Sovereign Cloud)
2.1.3 On-Prem + Air-Gapped (GPU Infra)
2.1.4 Hybrid Architectures
2.1.5 Vendor Strategy & Model Portability

2.2. Governance as Architecture

2.2.1 Audit-heavy architectures
2.2.2 IAM & Access Control
2.2.3 Cost Management & Token Budgets
2.2.4 Stakeholder Alignment & Architecture Politics
2.2.5 Trust-building & Phased Adoption

Module 3 — Strategic Risk & Governance

3.1. Discovery & Consulting Framework

3.1.1 What problem are we solving?
3.1.2 Where does work stop?
3.1.3 What data can leave the boundary?
3.1.4 Who approves exceptions?
3.1.5 What failure is expensive?

3.2. Systemic Risk Assessment

3.2.1 Hallucination & Success detection (Fundamentals)
3.2.2 Prompt & Tool security (Fundamentals)
3.2.3 Legal & Compliance Review
3.2.4 Business Impact of Failure

Module 4 — Example: Claude Enterprise AI

4.1. Claude Enterprise Architecture

4.1.1 Claude Enterprise AI
4.1.2 Claude Agent SDK
4.1.3 Hub-and-Spoke Patterns
4.1.4 Model Context Protocol (MCP)
4.1.5 Deterministic Enforcement (Hooks)
4.1.6 Validation-Retry Loops

4.2. The Claude Enterprise AI playbook

4.2.1 Claude Enterprise Playbook (FDE model)
4.2.2 Engagement Phases (Discovery to Scale)
4.2.3 FDE Technical Artifacts
4.2.4 White-Glove Support Models
4.2.5 Continuous Feedback Loops
4.2.6 E2E Example: Automated Loan File Auditor
4.2.7 E2E Example: Multi-Source Underwriting Assistant

Track 5 — Agentic Systems

Module 1 — Foundations (mandatory)

1.1. Distributed Systems Thinking

1.1.1 State machines
1.1.2 Queues
1.1.3 Retries
1.1.4 Idempotency
1.1.5 Timeouts
1.1.6 Failure recovery
1.1.7 Event-driven architecture
1.1.8 Workflow engines
1.1.9 Human approval gates
1.1.10 Observability
1.1.11 Designing Data-Intensive Applications
1.1.12 Temporal concepts
1.1.13 Apache Airflow basics
1.1.14 AWS Step Functions ideas

1.2. Planning + Decision Systems

1.2.1 Finite State Machines (FSM)
1.2.2 Hierarchical State Machines
1.2.3 Behavior Trees
1.2.4 Goal-oriented planning
1.2.5 PDDL (Planning Domain Definition Language)
1.2.6 HTN (Hierarchical Task Networks)
1.2.7 Rule engines
1.2.8 Constraint solving
1.2.9 XState
1.2.10 LangGraph
1.2.11 PDDL literature
1.2.12 Robotics planning basics

1.3. Retrieval + Grounding

1.3.1 Embeddings
1.3.2 Vector search
1.3.3 Hybrid search
1.3.4 Reranking
1.3.5 Chunking
1.3.6 Memory systems
1.3.7 Context construction
1.3.8 Grounded generation
1.3.9 Google Cloud Vertex AI retrieval patterns
1.3.10 Typesense
1.3.11 Pinecone
1.3.12 RAG (Retrieval-Augmented Generation)

Module 2 — LLM Systems

2.1. Tool Use + Execution

2.1.1 Tool calling
2.1.2 Structured outputs
2.1.3 Function schemas
2.1.4 MCP (Model Context Protocol)
2.1.5 A2A (Agent-to-Agent)
2.1.6 ADK patterns
2.1.7 Sandboxing
2.1.8 Permission boundaries
2.1.9 Anthropic MCP
2.1.10 Google ADK
2.1.11 CLI-agent patterns (Codex / Gemini / Claude Code)

2.2. Prompting for Systems

2.2.1 Prompt contracts
2.2.2 Tool instructions
2.2.3 Output guarantees
2.2.4 Failure handling
2.2.5 Repair loops
2.2.6 Self-checking
2.2.7 Reflection

2.3. Evaluation

2.3.1 Offline evals
2.3.2 Online evals
2.3.3 Task completion metrics
2.3.4 False success detection
2.3.5 Human review systems
2.3.6 Cost vs latency tradeoffs

Module 3 — Security (critical)

3.1. Agent Security

3.1.1 Prompt injection
3.1.2 Indirect prompt injection
3.1.3 Memory poisoning
3.1.4 Tool abuse
3.1.5 Credential leakage
3.1.6 Sandbox escape
3.1.7 Identity isolation
3.1.8 Approval boundaries
3.1.9 Least privilege
3.1.10 Audit logs
3.1.11 Anthropic Claude Code incidents
3.1.12 Prompt injection research
3.1.13 Agent exploit case studies

Module 4 — Production Architecture

4.1. Real Agent Architectures

4.1.1 Deterministic workflows + LLM steps
4.1.2 Single orchestrator + tools
4.1.3 Multi-agent systems
4.1.4 Event-driven workers
4.1.5 Human-in-the-loop systems

4.2. Programmable Agent Systems

4.2.1 Visual agent system designers architecture
4.2.2 Headless agent runtime
4.2.3 Pi Coding Agent
4.2.4 Commercial products
4.2.5 Open-source vs enterprise builders
4.2.6 Vendor lock-in and portability

4.3. Agent Harnesses

4.3.1 Custom harnesses

4.4. Agent Frameworks