Legacy Event Store Upgrades and Project Remediation

20+ Years Combined Experience with

We’ve completed dozens of ESDB based
legacy migration | performance | stability
projects from very small to the largest.

Event Horizon's​


Chris Condron

Long term contributor, 1st customer of event store, 4 years as CTO Event Store 

Chris Condron

Long term contributor, 1st customer of event store, 4 years as CTO Event Store 

James Geall

One of the first contributors, built some of the largest applications that use Event Store, 4 years as VP Engineering and Support with Event Store

Book a Meeting with Our Experts

Offering EventStoreDB, Event Sourced, Event Driven Architecture, Messaging and relational data model expertise including transitioning between different approaches.

Common Challenges We Can Help With.

  • Your Current version of ESDB is out of support
  • You need to upgrade a running ESDB instance
  • Your ESDB instance is unstable
  • Your Event Sourced application is unstable or underperforming
  • Your team needs application guidance or training

DB Services

  • Upgrading out of support ESDB instances including detailed upgrade plans
  • Stabilization, Clean Up and Legacy Data Truncation for current or previous versions of ESDB
  • Ongoing maintenance planning

Project Services

  • Comprehensive Project review and guidance
  • Re establish your project team to run in house and add features
  • Custom Training

Book a Call to Discuss How We Can Help You.


James has the most detailed technical understanding out of everyone I have had the pleasure to work with. From top level architecture down to CPU instructions and everything in-between, he uses his outstanding expertise to consistently deliver high performance, robust code that meets the business need. 10/10 would work with again.  

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Timothy Coleman
Distributed Systems Engineer
The approach was a perfect fit when building a system with multiple clients that needed to be fully auditable. It saved us time and reduced complexity by aligning the natural data model with the needs of our domain. In addition, having a system built around testable aggregates enabled us to easily distribute the development work while ensuring a fast and straightforward integration process at the end of each development cycle.

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Josh Kempner
Systems Architect
Chris has an uncanny ability to solve very difficult problems. His strategic vision also led to a common architecture across multiple product lines in the in-vivo imaging product space. His architecture facilitated rapid development across each product line.  

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Jay Powell
Principal Software Engineer
I have had the pleasure of working with James on multiple projects throughout my career. James stands out as the the best combination of deep technical skills, engaging style and pragmatism. It’s rare to have such broad knowledge, almost impossible to match that to deep theoretical understanding, and to bring those two together pragmatically isn’t something I’ve seen anyone do as well as James.  

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Nick Browne
Founder Causeway.ai