FIELD NOTES & ARCHITECTURAL SPECS

Technical Writing

Deep dives into backend engineering realities: failure modes, distributed consensus at the edge, data synchronization, and operational resilience.

NOTE 01 · OCT 2025

6 min read

At-least-once delivery is easy; exactly-once is a product decision

Why idempotency keys, explicit device-side ACK contracts, and retry budgets are the only reliable way to prevent duplicate execution when the network partitions.

Idempotency Keys Device ACK Retry Budgets Dead-Letter Queues SSE / BullMQ

Read Full Analysis →

NOTE 02 · AUG 2025

8 min read

Offline-first is a data-model problem, not a sync button

A sync button is a UX admission of defeat. True resilience requires append-only local mutation queues, schema-per-tenant isolation, tombstones, and causal reconciliation.

Local Queues Schema-per-Tenant Causal Ordering Tombstones PostgreSQL

Read Full Analysis →

NOTE 03 · JUN 2025

7 min read

Designing for the six-hour outage

What happens to order streams when an edge kitchen loses power for six hours? Building heartbeat telemetry, exponential backoff ceilings, and disaster-recovery snapshots.

Heartbeat Pipelines AWS IoT Core DynamoDB Snapshots Backpressure Runbooks

Read Full Analysis →