Cymatic Logic

01 SOFTWARE INTEGRATION · PRODUCTION SYSTEMS

Make the system
make sense again.

I take over difficult existing systems, trace failures across boundaries, and turn fragile backend, integration, and data workflows into software your team can reason about.

Start with a paid diagnostic ↗ See production evidence
Existing systemsAPI & vendor integrationsSQL & data workflowsReliability
13+years in production engineering
1M+push notifications / day
50K+SMS deliveries / day
3,300+schools on a nationwide platform

02 THE PROBLEM

The code is rarely the whole problem.

Production failures accumulate in the spaces between systems: application ↔ database, service ↔ vendor, scheduled job ↔ operator, old assumptions ↔ new requirements.

Cymatic Logic makes those boundaries visible, identifies the failure modes that matter, and gives your team a practical path forward — without defaulting to a rewrite.

03 FOCUSED ENGAGEMENTS

Start small.
Reduce uncertainty first.

A diagnostic is designed to answer what is actually wrong, what matters first, and what is safe to change.

01TAKEOVER

Backend / SQL
System Takeover Audit

For systems that work, but nobody can confidently explain, maintain, or change.

  • Architecture & critical flows
  • SQL & data access patterns
  • Deployment dependencies
  • Failure & recovery paths
YOU GETPrioritized technical assessmentRisks · quick wins · next steps
02INTEGRATION

Integration &
API Rescue

For unreliable vendor APIs, webhooks, providers, legacy interfaces, and cross-system state.

  • Contract & authentication failures
  • Retry, timeout & duplicate behavior
  • State mismatch & consistency
  • Provider routing & switching
YOU GETRoot cause + integration mapFailure modes · remediation plan
03RELIABILITY

Production Reliability &
Data Workflow Review

For recurring incidents, fragile background jobs, ETL, and manual recovery workflows.

  • Batch & scheduled processing
  • Retry, replay & reconciliation
  • Data validation & ETL
  • Logging & observability
YOU GETReliability findingsScenarios · fixes ranked by impact

04 PRODUCTION EVIDENCE

Built around constraints
that were already real.

Long-lived systems, external providers, operational deadlines, dirty data, and users who cannot wait for a rewrite.

01 / DELIVERY

Multi-provider messaging

Production delivery across five SMS providers, with persisted delivery state, retry behavior, and operational troubleshooting.

1M+ push · 50K+ SMS / day
02 / DATA

Recoverable ETL

Oracle → SQL Server workflows handling malformed, incomplete, failed, and orphan records with explicit replay paths.

Failure-aware data processing
03 / OWNERSHIP

Production takeover

C#/.NET, SQL Server, Azure, IIS, Application Insights, provider integrations, deployment, and incident diagnosis.

Existing systems, evolved in place
04 / CONTRACTS

Cross-team orchestration

Frontend, DB APIs, independently maintained computation modules, artifacts, and persistence connected through explicit boundaries.

Ownership isolated by contract

05 HOW I WORK

Diagnose before rewriting.

Every step should reduce uncertainty. Implementation comes after the system is understood well enough to change safely.

01Inspect

Code, logs, data flows, deployment, and operational pain.

02Map

Ownership, dependencies, boundaries, and critical paths.

03Diagnose

Failure modes, evidence, and root causes rather than symptoms.

04Prioritize

Business impact, reversibility, risk, and effort.

05Fix

Hand off a clear plan or continue into remediation.

06 PRINCIPAL

KC Wang

TAIWAN · UTC+8 · REMOTE

Senior Backend / Systems / Integration Engineer with 13+ years of production engineering experience.

My background spans C#/.NET, SQL Server, Azure, APIs, ETL, messaging, production troubleshooting, data workflows, and long-lived systems. I work especially well where software crosses boundaries between applications, databases, external services, infrastructure, and the people operating them.

View engineering evidence ↗