Infographic 05 · D3

Skills, and the evidence for each

Cell colour is what an employer weights. The bar on the right is how strong the evidence actually is. The interesting rows are the ones where those two disagree.

Weighting by employer, against evidence depthhover a row

Every row names the shipped code behind it. Netflix weights the same core as everyone else, plus fault injection, media pipelines and ranking evaluation.

The same data as a table

Skill	Evidence	Google	Spotify	Netflix	Bank	Depth
Event logs & consumer groups	BillboardActivityService · Kafka, 3 groups	HIGH	HIGH	CRIT	HIGH	5 / 5
Idempotency & delivery semantics	three sinks, three mechanisms	HIGH	HIGH	HIGH	CRIT	5 / 5
Partitioning & shard-key design	MatchService · (service_region, geohash4)	HIGH	HIGH	CRIT	HIGH	5 / 5
Concurrency correctness in Go	fatal map race G-07 · calling_race_test.go	CRIT	HIGH	HIGH	HIGH	5 / 5
Load testing & fault injection	FeedBench · 3 runtimes, 6 injected faults	HIGH	HIGH	CRIT	HIGH	5 / 5
Incident root-cause analysis	7 postmortems · Kafka offset-skip found	CRIT	HIGH	CRIT	CRIT	5 / 5
Realtime transport & presence	GlobalChatService · WebSocket, TTL presence	MED	HIGH	MED	MED	5 / 5
Contract discipline in CI	OpenAPI + AsyncAPI + 24 protobufs	HIGH	MED	HIGH	CRIT	5 / 5
Large-file & media pipelines	R2 multipart, IngestDO, TUS, range streaming	MED	CRIT	CRIT	LOW	5 / 5
Kubernetes & autoscaling	Solomon · k3s, Helm, HPA, NetworkPolicy	CRIT	HIGH	HIGH	MED	4 / 5
Recommendation & ranking evaluation	BillboardML · paired bootstrap release gate	HIGH	CRIT	CRIT	MED	4 / 5
Audio DSP & fingerprinting	1.14B-pair index · 4 bit-exact ports	LOW	CRIT	MED	NONE	5 / 5
Money paths & double-entry ledgers	Storefront · int64 ledger, replay-safe webhooks	MED	LOW	MED	CRIT	4 / 5
Auth, tokens & key handling	AuthGateway · RS256, ACL, mode-sync	MED	MED	MED	CRIT	4 / 5
ML platform & release gating	Solomon · 9 promotion-blocking gates	HIGH	MED	HIGH	HIGH	4 / 5