Daniel Amundson
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🏗️ Critical Systems · Grid · Enterprise

Legacy Infrastructure Modernization

Safe-fail migration paths for critical systems running your business. Map hidden dependencies and modernize without operational disruption.

The Real Risk

Many organizations are running multi-million dollar operations on code that nobody fully understands anymore. The people who wrote it are gone, the documentation is stale, and every change feels dangerous.

My role is to surface the hidden dependencies, quantify the technical debt as financial risk, and design a modernization path that doesn’t put the core business at risk.

Board-Level Outcomes

What you gain

  • • Clear map of legacy risk and blast radius
  • • Phased modernization roadmap with rollback paths
  • • Translation of tech debt into P&L and valuation impact
  • • Confidence that “fixing the past” won’t break the present

What This Includes

Legacy Dependency Mapping

See what your systems are actually doing — not what the diagrams from 2012 claim they do.

I analyze architecture, data flows, and operational behavior to build a current-state map of your critical systems. The goal is to identify what is safe to touch, what is fragile, and what is business-critical.

  • Inventory of core services and their dependencies
  • Risk scoring based on impact and likelihood of failure
  • Identification of “single points of failure” and key-person risk

Risk-Adjusted Migration Roadmap

A modernization plan that can survive contact with reality.

Instead of betting the company on a “big bang” rewrite, we design a phased plan that isolates risk and delivers value incrementally. Each phase has clear success criteria and fallbacks.

  • Prioritized backlog of modernization initiatives
  • Cut-over and rollback strategies for critical components
  • Alignment with operational, regulatory, and uptime requirements

Technical Debt Liability Assessment

Turn “we know it’s messy” into a quantified line item your board can act on.

I translate code quality, architectural shortcuts, and aging infrastructure into financial language: operational drag, scaling cost, outage risk, and valuation impact.

  • Estimate of “cost to clean up” vs. “cost to ignore” over time
  • Impact on uptime, incident rates, and customer experience
  • Board-ready documentation for investment decisions

Blind Case Study: Utility Grid Modernization

A large utility provider needed to modernize data ingestion and monitoring for more than 14 million transmission devices running on legacy protocols. The existing system was fragile, and outages would have had real-world impact.

I was engaged to design a modernization approach that could be deployed without interrupting critical operations.

Outcome:

  • Designed a high-throughput ingestion and monitoring layer around existing devices
  • Executed migration with zero critical downtime
  • Delivered real-time grid visibility enabling predictive maintenance and load management

Sitting on risky legacy systems?

We can map the risk, design a safe modernization path, and give your board the clarity needed to make confident investment decisions.