Papassorn Phopong

Recruitment surface built for Ngern Tid Lor where each pipeline expects different field shapes and stage semantics. The system problem is fan-out: many small reads and writes that must not block each other, plus a need to replay hiring events when a downstream consumer misbehaves.

Async-first handoffs between services; PostgreSQL per service for isolation; replay as the operational backstop.

Key decision: Moved lifecycle side effects onto a log-backed bus instead of synchronous calls, accepting stricter idempotency and replay discipline in exchange for keeping recruiter-facing reads fast while slow third-party calls and back-office jobs caught up independently.

Moving lifecycle changes onto a log-backed bus decoupled UI-facing aggregation from slow third-party calls; recruiters saw faster list loads while back-office jobs could catch up without taking down the BFF, and support could re-drive failed events instead of patching data by hand.

Integration: BFF composes tenant-specific views; bounded contexts persist locally and publish domain events; workers consume for search indexing, webhooks, and SLA timers.

Hybrid stack (Message Center real-time push next to the Ampol Food loyalty CRM at Kanda) where live channels sit beside CRM entities that must stay consistent for revenue teams. Tension: users want instant feedback, but the canonical customer record cannot fork between Node and PHP paths.

Read-optimized edges, write-through core, cache-aside for hot lists—explicit ownership per aggregate.

Key decision: Pinned every authoritative CRM mutation to the transactional core and limited the real-time tier to delivery and presence only, accepting extra cross-stack coordination so the canonical customer record could never fork between the Node and PHP paths.

By pinning authoritative CRM mutations to one path and using Redis-backed channels only for delivery and presence, we cut inconsistent thread-to-account states; incident volume from “wrong customer context” dropped and on-call could trust which service owned writes.

Integration: Real-time tier handles connection fan-in and ephemeral state; domain mutations flow through the transactional core so there is one reconciliation story.

Appraisal cycles (NocNoc) with multilingual forms, role-based visibility, and HR/manager sign-offs. Unlike high-volume recruitment events, this system optimizes for immutable audit: who saw what, who attested, and which version of a template was in force when a rating was submitted.

Cycle-scoped transactions for submissions; append-only audit for manager and employee attestations.

Key decision: Optimized for immutable audit over write throughput—versioned templates and per-cycle frozen snapshots—accepting more storage and promotion-job overhead so a rating stays tied to the exact template and approvals in force when it was submitted.

Versioned evaluation templates and frozen snapshots per cycle let HR close books without disputes reopening over which template version applied; leadership reporting pulled from the same snapshot store instead of reconciling spreadsheets after the fact.

Integration: Flexible document store for evolving form definitions; server-rendered EJS workflows with Vue.js-driven form interactions (instead of jQuery-style DOM scripts); relational reporting store fed by explicit promotion jobs so analytics never reads half-written cycle data.