op_01J6FR84Technical architecture / evidence-led
Reliability lives
between the screens.
FieldRelay treats offline writes, conflicting reports, and destination failures as domain records that can be inspected and recovered—not incidental errors.
Field boundaryReact Native AndroidSQLite / operation queue sync + same key →Node TypeScript APIRules / idempotency / SSE
corr_fr0842_b17ePersistence boundaryPostgreSQL transactionDomain mutation + audit + outbox commit once →Outbox relayPublish / retry / observe
shipment.version = 08OB / 0019Delivery boundaryQueue + dead letterBackoff / DLQ / manual replay stable key →Destination adapterGeneric webhook / OData example
DL / 019dest_fr0842_completed_v1
Six implementation decisions
Failure paths are part of the product.
Separate state dimensions
Lifecycle, device synchronization, business exception, and destination delivery never collapse into one ambiguous status.
Local operation queue
Every offline write carries an idempotency key, base entity version, and device timestamp.
Append-only evidence
Source reports remain immutable. Corrections and resolutions create new events linked by correlation ID.
Transactional outbox
Completion and delivery creation commit together, removing the gap between database state and message publication.
Recoverable delivery
Visible retries, dead-lettering, and manual replay retain one destination idempotency key.
Adapter boundary
The core emits a generic completion event; webhook and illustrative OData adapters translate at the edge.
Prototype boundary
What changes before production.
- Managed PostgreSQL, secrets manager, and environment-isolated keys.
- Authenticated tenancy and short-lived signed handoff tokens.
- Real SQS/DLQ metrics, alarms, and incident ownership.
- Jurisdiction-approved rules owned by qualified domain specialists.
- Encrypted device database, remote revocation, and mobile threat review.
- Load, chaos, accessibility, and recovery-time testing.
React
React Native
TypeScript
Node.js
PostgreSQL
AWS queues
FR / TECHNICAL / TRACE
See the architecture fail safely.
FieldRelay is an independent portfolio prototype using fictional organizations, synthetic shipment data, and illustrative validation rules. It is not affiliated with WiQ Technologies and is not intended for production or regulatory use.