Arjun Iyer · July 31, 2025
What a preview environment is, how it relates to staging and ephemeral environments, the four ways to build one, how the platforms compare, and what coding agents change about them.
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What a contract test proves and misses, consumer-driven versus provider-driven contracts, the tools from Pact to SmartTests, and what changes when coding agents write both sides of an API.
What a staging environment is for, why one shared copy becomes a bottleneck at microservices scale and under coding agent volume, and the alternatives teams use instead, compared.
Four levels of MCP server testing, from unit tests and the MCP Inspector to integration tests against real dependencies and agent evals, with each change isolated on a shared cluster.
Four ways to develop locally when services run on Kubernetes, from local clusters and sync tools to a shared cluster and cloud development environments, weighed on speed, quality and cost.
The two things a Kubernetes sandbox can mean, a secure box for untrusted or AI-generated code and an isolated environment for testing a change against real services, and when to use each.
Coding agents have moved the bottleneck from writing code to verifying it. What a closed loop against real Kubernetes dependencies needs, from who writes the checks to scaling to agent volume.
What ephemeral environments are, the four ways to build them on Kubernetes, the tools compared, and how they handle cost, databases, message queues and the volume coding agents bring.
Why traditional staging fails FinTech testing, where compliance, customer trust and speed all matter, and how the sandbox model works in practice at Brex and Earnest.
What changes when you move from testing a monolith to testing services that depend on each other, and how to test each layer without slowing releases down.
Why traditional contract testing buckles as services and teams grow, how AI-powered checks on every pull request take its place, and what DoorDash, Brex and Earnest gained.
What a preview environment is, how it relates to staging and ephemeral environments, the four ways to build one, how the platforms compare, and what coding agents change about them.
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