Devops

*Accelerate: The Science of Lean Software and DevOps* — Forsgren, Humble & Kim

Eight Accelerate-validated CD capabilities; key empirical findings: config-in-VCS more predictive than code, developer-owned tests, trunk-based development, loosely coupled architecture as the single largest CD lever; shift-left security (DevSecOps); lightweight change approval vs CABs; relationship between CD, culture, burnout, and job satisfaction

Fitness function automation; stages, fan-in/fan-out; CD vs CDP; cycle time as business metric; zero-downtime deployment (four phases: prepare/drain/apply/start); expand/contract relational schema pattern; trickle-then-batch schemaless migration; canary group evaluation; immutable infrastructure; EDM deployment patterns

DORA four key metrics (deployment frequency, lead time for changes, change failure rate, time to restore service); empirical basis (4-year, 23K+ respondents, Accelerate); Lean conceptual basis; cluster analysis; no-tradeoff finding; CABs negatively correlated with both metrics; Goodhart's Law warning; pipeline topology variants; instrumentation; MVD; virtuous cycle mechanism; complementary metrics

Co-author of *Team Topologies*; DevOps and platform engineering consultant; team interaction and organisational sensing specialist

Co-author of *Team Topologies*; co-creator of Team Topologies model; fast flow and organisational design specialist

Fine-grained domain services; maximum quanta; highest agility/cost; DDD: deep module heuristic, BC vs microservice relationship, subdomain as safe granularity, OHS/ACL for deeper services

Four-layer MLOps stack (storage/compute, resource management, ML platform, dev environment); cloud repatriation; Docker + Kubernetes; workflow orchestration tools (Airflow/Argo/Prefect/Metaflow); model store (8 artifact types); feature store (management/computation/consistency, eliminates training-serving skew); build vs buy framework

SRE as discipline: dev/ops conflict; error budgets; toil cap (50%); SLO-driven alerting; blameless postmortems; SRE vs DevOps distinction; applicability outside Google

*Software Architecture Metrics* — Ciceri et al.

Ron Westrum's organisational culture typology (pathological/bureaucratic/generative); information flow as core mechanism; Likert measurement with psychometric validation; predicts delivery performance, org performance, job satisfaction; how to improve culture (implement practices first); blameless postmortems; Google Project Aristotle alignment