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Architecture, Systems & Hardware Infrastructure

Systems Built for Resilience & Scale

Real backend architectures, database schemas, and hands-on bare-metal server management. Explore live homelab telemetry, incident post-mortems, and production transaction engines.

Bare-Metal Server Architecture: WALL-E

TELEMETRY REFRESH: REALTIME HOST

WALL-E

Bare-Metal HomeLabTrueNAS Core/Scale

SPECS:Intel Core i5 (3rd Gen)16 GB DDR3 RAMLow TDP Energy Profile (~38W)

UPTIME: 99.98%ALL DAEMONS OPERATIONAL
Storage Pools & Data Tiering Visualizer
TOTAL DISKS: 4
> [INSPECTING]Pool 02: Media Assets & Streaming
36°CMOUNT: /mnt/tank/media-pool
FILE SYSTEM / DATASETZFS Dataset (Compression: lz4)
IO PROFILESequential Read Optimized
INTEGRITY SCRUBScrubbed 2d ago (0 errors)

Dedicated high-density storage hosting the Jellyfin streaming library with direct-play audio/video catalogs.

Active Production Microservices
4/4 HEALTHY
Online

Jellyfin

Media Server & Transcoding

:8096Direct Play Enforced
Online

Immich

High-Performance Photo Storage

:2283Background ML Indexing
Online

OwnCloud / NextCloud

Data Sovereignty & Secure Sync

:443 / SSLAES-256 Remote Sync
Active

Hermes Agents

Automated Tasks, Cron & Probes

Daemon WorkerTelemetry & Health Checks

Incident Report #01: Concurrency Under Pressure

SEVERITY: P1 · STATUS: RESOLVED
POST-MORTEM: PEAK STREAMING BUFFERING COLLAPSE
TARGET NODE: WALL-E (TrueNAS) · SERVICE: JELLYFIN
TIME TO MITIGATION18 Minutes
DATA LOSS0 Bytes
01 // THE CRISIS

Simultaneous 4K/1080p Streams Spike

During a family gathering, 5 simultaneous media streams started playing across multiple rooms. Playback began stuttering, I/O latency jumped from < 5ms to > 850ms, and Jellyfin web UI stopped responding.

02 // ROOT CAUSE ANALYSIS

Transcode Thrashing & ZFS ARC Eviction

Two mobile clients requested unsupported codecs, triggering simultaneous FFmpeg software CPU transcodes on the 3rd-gen i5. This caused 100% CPU lock, starved the ZFS ARC cache, and generated disk head thrashing across the 1TB HDD media pool.

03 // THE ENGINEERING FIX

Direct Play Enforcement & Resource Pinning

Enforced client-side Direct Play video profiles (H.264/AAC compatibility fallback), isolated transcode scratch storage into SSD RAM-disk (/dev/shm), and set container CPU quotas to preserve 20% headroom for TrueNAS kernel operations.

Production Engineering Takeaway for High-Scale Applications

“The exact same diagnostic rigor applied here is what saves an E-commerce store or SaaS platform during sudden peak traffic spikes (e.g., Black Friday campaigns). Profiling whether bottlenecks stem from compute saturation, disk I/O thrashing, or unbuffered client payloads separates reliable systems from catastrophic downtime.”

Production Backend Architectures

DISCIPLINE: CONCURRENCY, DATA INTEGRITY & ISOLATION
[PROD-SYS-01]FINANCIAL TRANSACTION INTEGRITY

High-Throughput E-Commerce Inventory & Checkout Engine

PRODUCTION ACTIVE
Node.jsExpressTypeScriptPostgreSQLRedisDocker

Engineered to eliminate overselling during high-concurrency flash sales and marketing surges. Replaced naive read-then-write logic with ACID-compliant relational isolation and Redis distributed token locks.

// ARCHITECTURAL SAFEGUARDS
PostgreSQL SELECT ... FOR UPDATE row-level locks ensuring absolute stock consistency under concurrent checkout requests.
Idempotency token validation with 24-hour TTL in Redis to safely withstand customer duplicate submits and network retries.
Asynchronous worker pool processing order fulfillment events detached from the synchronous checkout path.
P99 LATENCY42 msUnder 2,500 req/sec simulated spike
RACE CONDITIONS0 OversellsOver 100,000 stress transactions
TRANSACTION ABORTS< 0.04%Optimized lock hold duration
[PROD-SYS-02]DISTRIBUTED PLATFORM & SECURITY

Multi-Tenant SaaS REST API & Authentication Service

PRODUCTION ACTIVE
Node.jsTypeScriptSQL (Postgres)DockerJWT / OAuth2Nginx

Architected an enterprise multi-tenant API core with strict schema-level tenant isolation, automated migrations, zero-downtime rolling deploys, and sub-millisecond session authentication.

// ARCHITECTURAL SAFEGUARDS
Tenant context resolution middleware enforcing row-level schema boundaries with zero cross-tenant leakage vulnerability.
Cryptographically signed refresh/access token rotation with Redis revocation lists preventing session replay attacks.
Centralized RFC-7807 compliant error handling and structured JSON logging with OpenTelemetry trace correlation.
AUTH OVERHEAD1.2 msLocal cryptographic signature verify
SCHEMA ISOLATION100%Hard-isolated tenant queries
API AVAILABILITY99.95%Containerized zero-downtime rolling deploys
ZERO-DOWNTIME ARCHITECTURAL ENGINEERING

Want this level of architectural stability for your backend?

Whether you need to eliminate database deadlocks, architect high-concurrency checkout flows, or build bulletproof server infrastructure, let's talk systems.

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