Cymatic Logic

SOFTWARE INTEGRATION · PRODUCTION SYSTEMS

Make difficult existing systems understandable, reliable, and safe to change.

I help teams take over messy production systems, repair failing integrations, diagnose backend and data problems, and reduce operational risk without defaulting to a rewrite.

Start with a paid diagnostic See what I help with

Existing systems · APIs · SQL · Data workflows · Production reliability

THE PROBLEM

Your system works — but the boundaries are where it breaks.

The hardest production problems rarely live inside one function or service. They sit between applications, databases, third-party providers, scheduled jobs, legacy constraints, deployment environments, and the people operating them.

Cymatic Logic focuses on finding those boundaries, making failure modes explicit, and turning fragile workflows into systems a team can reason about.

SERVICES

Start with a focused technical diagnostic.

Small scope first. Understand the system before proposing a rebuild.

01

Backend / SQL System Takeover Audit

For systems that are difficult to understand, maintain, or safely change.

  • Architecture and critical flows
  • SQL and data access patterns
  • Deployment and production dependencies
  • Failure and recovery paths
  • Operational and documentation gaps
Deliverable

A prioritized technical assessment with risks, quick wins, and recommended next steps.

02

Integration & API Rescue

For systems depending on vendor APIs, providers, webhooks, or legacy interfaces.

  • API and contract failures
  • Authentication and state mismatches
  • Retry, timeout, duplicate, and missing-operation behavior
  • Provider routing and switching
  • Cross-system consistency
Deliverable

Root-cause analysis, integration map, and a concrete remediation plan.

03

Production Reliability & Data Workflow Review

For recurring incidents, fragile background jobs, ETL, and operational workflows.

  • Batch and scheduled processing
  • Retry, recovery, and reconciliation
  • Data validation and ETL
  • Logging and observability
  • Database performance and operational tooling
Deliverable

Reliability findings, failure scenarios, and practical changes prioritized by impact.

PRODUCTION EVIDENCE

Real systems, real operational constraints.

700K–1M+push notifications / day
30K–50KSMS messages / day
5integrated SMS providers
3,300+schools on a nationwide finance platform

These systems required integration boundaries, failure recovery, production diagnostics, and incremental modernization — not greenfield rewrites.

Recoverable data processing

Oracle → SQL Server ETL with validation, cleansing, business-rule calculation, explicit failure paths, and selective replay.

Cross-team orchestration

Frontend requests, persisted data, independently maintained computation modules, artifacts, and persistence connected through explicit contracts.

Production ownership

C#/.NET, SQL Server, Azure, IIS, Application Insights, provider integrations, deployment, and incident troubleshooting across system boundaries.

HOW I WORK

Diagnose before rewriting.

01Inspect

Gather system context, logs, code, data flows, and operational pain.

02Map

Identify ownership, dependencies, integration boundaries, and critical paths.

03Diagnose

Reproduce failure modes and separate symptoms from root causes.

04Prioritize

Rank risks and fixes by business impact, reversibility, and effort.

05Fix

Hand off a plan or continue into implementation and remediation.

ABOUT

KC Wang

Senior Backend / Systems / Integration Engineer with 13+ years of production engineering experience. My background spans C#/.NET, SQL Server, Azure, API integration, ETL, messaging, production troubleshooting, data workflows, and long-lived software systems.

I work especially well where software crosses boundaries between applications, databases, external services, legacy systems, infrastructure, and the people operating them.

Based in Taiwan (UTC+8), working remotely with international teams.

View engineering background ↗