About Us
JasperFx Software
JasperFx Software is the company behind the Critter Stack — a suite of proven, open source .NET libraries for Event Sourcing, CQRS, document storage, and asynchronous messaging. We provide consulting services, support agreements, workshops, and commercial products to help organizations build and maintain high-quality server-side systems.
Founded by the core maintainers of Marten and Wolverine, we are committed to making the Critter Stack the best possible choice for server-side .NET development. We are also available for broader consulting engagements to help companies improve their software development outcomes on any technical stack.
Jeremy Miller
Jeremy Miller is the founder of JasperFx Software and the creator of the Critter Stack. With decades of experience as a software architect and consultant across industries including finance, insurance, healthcare, and banking, Jeremy brings deep expertise in building and maintaining enterprise systems over time.
Jeremy has long been active in the .NET community as one of the pioneers of Agile Development in the .NET ecosystem, the leader of several OSS tools including StructureMap, the original IoC container for .NET, and a frequent conference speaker and technical writer.
Jeremy has led software architecture teams and mentored architects across organizations. His experience as both an in-house architect and an external consultant gives him a unique perspective on the real-world challenges teams face when adopting Event Sourcing, CQRS, and modern architectural patterns.
Babu Annamalai
Babu Annamalai brings over 28 years of experience in technology and product management, with deep expertise in crafting solutions for the investment management and research domains. He is a co-maintainer of Marten and the creator of several .NET open source libraries including ReverseMarkdown.Net and MysticMind.PostgresEmbed.
Babu also runs Radarleaf Technologies, providing consultancy and bespoke software development services. His combination of enterprise product management experience and hands-on open source development makes him a key contributor to both the technical direction and practical usability of the Critter Stack.
The Critter Stack by the Numbers
As of April 2026
Marten
Since October 2015
Wolverine
Since September 2022
Conference Talks
Critter Stack Core Team
Erik Shafer
Erik Shafer has spent most of his career trying to make business software feel less like a maze of indirection and more like something that actually tells you what happened and why. After years of building production systems with Marten and Wolverine, he has joined JasperFx as a core team member. Lately, Erik has largely focused on domain modeling and event-driven systems, consulting with teams on their architecture, all while sharing what he has learned through conference and user group presentations.
LinkedIn ➔
Anne Erdtsieck
Anne Erdtsieck is a software architect working in healthcare, building solutions that truly make a difference. His focus is on Domain Driven Design, Event Sourcing, CQRS, and event-driven architecture — not as buzzwords, but as practical tools to bring clarity to complex domains. Anne thrives in projects that need a fresh start, taking the first steps, involving the right people, and bringing energy before handing over the reins and moving on to the next meaningful challenge.
LinkedIn ➔
Jaedyn Tonee
Jaedyn Tonee is a Software Architect at Quartex with a broad skillset spanning .NET, Vue.js, Blazor, CI/CD, security (ISO 27001, SOC 2), and cloud infrastructure (Azure, AWS CDK, Pulumi). An open-source hobbyist with regular contributions to his own and third-party packages, Jaedyn also maintains a Discord bot serving over 4,100 guilds and 590,000 users.
LinkedIn ➔