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System Architecture & Design

Engineered for high reliability, zero data loss, and long-term maintainability.

A multi-layered modular architecture that isolates business rules from physical compute, standardizes transaction integrity, and guarantees scalable event streaming.

High-Level Topology

System Layers Overview

1. CLIENT & INGESTION TIER Edge Layer
Browser SPA
Vue / React Admin & Customer UI
Mobile Clients
iOS / Android (REST / WebSocket)
B2B Webhook Ingest
HMAC signed incoming webhooks
System REST APIs
Implementation Contracts & Scopes
↓ TLS Termination / Rate Limiting / Tenant Resolution ↓
2. APPLICATION & ROUTING LAYER Controller & DTO Validation
Tenant Scoping Middleware
Subdomain, Header, or JWT claim tenant resolution
Strict Form Requests
Strong parameter validation & typecasting
API Resource Transformers
Deterministic JSON response envelopes
↓ Action Execution & State Machine Guards ↓
3. DOMAIN LOGIC & ALEGOR PLATFORM CORE Core Engine
Identity & MFA
SAML/OIDC SSO & token vaults
RBAC / ABAC Policies
Sub-millisecond permission cache
Immutable Audit Trail
Append-only diff stream & telemetry
Workflows (FSM)
Deterministic state transitions
Documents & S3
Presigned URLs, OCR, malware scan
Omni Notifications
Email, SMS, Webhook, In-App
Integration Gateway
Circuit breakers & DLQ replay
Reporting Streamer
Async aggregations & read replicas
↓ ACID Persistence / Event Dispatches / Cache Keys ↓
4. PERSISTENCE, QUEUES & INFRASTRUCTURE Data Tier
PostgreSQL Primary
WAL logging & Row-level lock safety
Read Replicas
Offloads analytical queries & reports
Redis Cluster
Session state, tags & lock mutexes
S3 / Cloudflare R2
Asset buckets with tenant path isolation
Asynchronous Processing

Events, Jobs & Queues

Any operation exceeding 50ms is dispatched to dedicated priority queues. Background workers process jobs idempotently with distributed mutex locks, exponential backoff jitter, circuit breaker protection, and dead-letter isolation.

01.
Transaction-Safe Dispatch: Jobs commit only after DB transactions complete via afterCommit(), preventing phantom reads.
02.
Tenant-Aware Mutex Locks: ShouldBeUnique guarantees single-flight execution across horizontal worker pools.
03.
Circuit Breakers & Jitter: Guards external ERP/APIs against cascading outages with backoff schedules up to 1 hour.
04.
Dead-Letter Isolation: Exhausted retries enter an immutable quarantine state for zero-data-loss telemetry and manual replay.
Asynchronous Execution Pipeline
Zero Data-Loss Guarantee
STAGE 01 ACID Safe
Post-Commit Dispatch

Jobs are held in memory until database transactions fully commit, eliminating race conditions and ghost job execution.

✓ Deduplication Mutex in Redis
STAGE 02 QoS Queues
Tiered Priority Routing

Dedicated worker clusters process high-priority transactions with sub-second SLA, separating heavy background reports.

✓ Horizontal Autoscaling
STAGE 03 Resilience
Circuit Breaker & Jitter

Exponential backoff with randomized jitter prevents thundering herd attacks during third-party partner outages.

✓ Automated Service Isolation
STAGE 04 Self-Healing
Dead-Letter Isolation

Failed jobs move to quarantined storage with payload snapshots, allowing automated retry or 1-click administrative replay.

✓ Audit Trail & Telemetry
Throughput
10k+ jobs/sec
Dispatch Delay
< 15ms
Concurrency
Distributed Lock
Data Loss
0.00%
Telemetry & Reliability

Observability & Health Checks

Comprehensive health probes monitor database connection pools, queue latencies, Redis memory saturation, and external API circuit breaker statuses.

Queue Depth Probes
Triggers automated horizontal scaling when job latency exceeds thresholds.
Query Latency Tracing
Identifies N+1 query regressions and slow database table locks.
Audit Stream Verification
Cryptographic HMAC hash chains verify log tamper resistance.

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