Craig Certo / software, systems, and writing
Craig Certo
I build software systems for difficult real-world problems.
This is where I share projects and writing.
Writing
Notes and essays
Nothing published yet.
Writing indexProjects
Things you can use
Career intelligence
Career Catalyst
A career platform that turns a person's work history into structured evidence, role analysis, and tailored application material.
Open Career Catalyst (opens in a new tab)Prompt tools
Refrase
A web app and browser extension that turns rough instructions into prompts shaped for the model you are using.
Open Refrase (opens in a new tab)Experience
Selected work
Forward-deployed engineering
Indemn
Own customer AI systems from discovery and architecture through data, integrations, implementation, production rollout, and live operation—then turn recurring delivery patterns into reusable product and platform capabilities.
Discovery → operation
Forward-deployed customer systems
Work directly with insurance teams to understand their operations, design the domain and workflow, connect AI to existing systems, and own delivery through production and live operation.
Shared platform
The platform behind applied AI
Design and build shared capabilities for domain context, agent execution, tools, integrations, human control, evals, observability, and continuous improvement.
Production understanding
Evaluation and production intelligence
Built the systems for understanding how agents behave in production: end-to-end traces, simulation, evaluations, regression gates, and root-cause analysis across models, tools, integrations, and the surrounding harness.
Field pattern → product
Turning recurring work into products
Convert recurring customer workflows into configurable products with security, multi-tenancy, integrations, validation, observability, and production controls.
Data engineering → senior data engineering
Fannie Mae
Designed and built cloud platforms, foundational data systems, and production AI for critical analytics and operational workflows.
Platform infrastructure
Cloud analytics platform
Designed and built the cloud platform and data infrastructure used to run critical R, Python, and SAS analytics workloads in AWS, including shared capabilities for data movement, pipelines, validation, monitoring, and governed deployment.
Core data systems
Loan, pricing, and capital data layers
Designed and co-built foundational data layers behind critical analytics and regulatory workflows, spanning data modeling, pipelines, stored procedures, financial logic, quality controls, and source-of-record transitions.
Production GenAI
AI for enterprise data discovery
Architected and deployed Fannie Mae's first production GenAI application: a multi-agent system that helped engineers and data scientists find and query the correct enterprise data using verified logic.
Pipeline reliability
Data quality across critical pipelines
Built and operated loan-acquisition pipelines and data-quality tooling that kept external data reliable for important models, analytics, and reporting.
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