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Kerno 1.0
The AI Runtime Backend QA Engineer
Kerno v1 is our biggest upgrade yet, a complete AI Backend QA Engineer. It maps your codebase, learns how your app works, and gets sharper with every run. It now tests your whole backend, from full user flows and live security checks to background jobs, queues, MCP servers and AWS serverless. Bugs get caught inside your agent's session before you open a PR, then re-checked on every PR in CI.
Kerno v1 is our biggest upgrade yet, a complete AI Backend QA Engineer. It maps your codebase, learns how your app works, and gets sharper with every run. It now tests your whole backend, from full user flows and live security checks to background jobs, queues, MCP servers and AWS serverless. Bugs get caught inside your agent's session before you open a PR, then re-checked on every PR in CI.
Quick context if you haven't seen us before. Agents write code really fast now. Knowing whether that code actually works is the slow part. Most teams find out hours later in CI, or worse, after it's merged. Then someone has to go back, figure out what broke, and redo it.
Kerno tests your backend while your agent is still working on it. It runs your app locally with your real database, queues and services, so it catches the bugs that only show up when the code actually runs. Your agent gets the failure right away and fixes it in the same session.
Here's what we added in v1:
🛒 User flows. Tell your agent "test a customer paying for a product" and Kerno goes through each step and checks the result at the end. After you change something, it re-runs the flows your change touched.
🔐 Security testing. Kerno tries things like accessing another user's data against your running app. If an endpoint lets it through, or leaks a stack trace, the test fails.
⚙️ Background jobs. Celery, Graphile Worker, Kafka, RabbitMQ, SQS and Azure Service Bus. Kerno runs the job on a real worker and checks what it wrote and what it sent.
🤖 MCP servers. Kerno tests every tool your server exposes, including ones behind auth.
☁️ AWS serverless. SAM and Serverless Framework apps, including Lambdas triggered by SQS, DynamoDB and Cognito sign-in.
🧠 It learns your app. The first time, Kerno figures out how to sign in and how to set up test data. It saves that in your repo so you can read it and fix it if it got something wrong.
✅ CI. Your tests are committed to the repo, and our GitHub Action re-runs them on every PR.
It's free for 30 test runs a month, no credit card. Open source projects get it free.
I'd love to hear what you think, and what the worst bug an agent has snuck into your backend is 😅 I'll be here all day!
About Kerno 1.0 on Product Hunt
“The AI Runtime Backend QA Engineer”
Kerno 1.0 was submitted on Product Hunt and earned 11 upvotes and 3 comments, placing #54 on the daily leaderboard. Kerno v1 is our biggest upgrade yet, a complete AI Backend QA Engineer. It maps your codebase, learns how your app works, and gets sharper with every run. It now tests your whole backend, from full user flows and live security checks to background jobs, queues, MCP servers and AWS serverless. Bugs get caught inside your agent's session before you open a PR, then re-checked on every PR in CI.
On the analytics side, Kerno 1.0 competes within Software Engineering and Developer Tools — topics that collectively have 564.3k followers on Product Hunt. The dashboard above tracks how Kerno 1.0 performed against the three products that launched closest to it on the same day.
Who hunted Kerno 1.0?
Kerno 1.0 was hunted by Karim Traiaia. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Karim Traiaia
Hey Product Hunt! 👋
Kerno v1 is our biggest upgrade yet, a complete AI Backend QA Engineer. It maps your codebase, learns how your app works, and gets sharper with every run. It now tests your whole backend, from full user flows and live security checks to background jobs, queues, MCP servers and AWS serverless. Bugs get caught inside your agent's session before you open a PR, then re-checked on every PR in CI.
Quick context if you haven't seen us before. Agents write code really fast now. Knowing whether that code actually works is the slow part. Most teams find out hours later in CI, or worse, after it's merged. Then someone has to go back, figure out what broke, and redo it.
Kerno tests your backend while your agent is still working on it. It runs your app locally with your real database, queues and services, so it catches the bugs that only show up when the code actually runs. Your agent gets the failure right away and fixes it in the same session.
Here's what we added in v1:
🛒 User flows. Tell your agent "test a customer paying for a product" and Kerno goes through each step and checks the result at the end. After you change something, it re-runs the flows your change touched.
🔐 Security testing. Kerno tries things like accessing another user's data against your running app. If an endpoint lets it through, or leaks a stack trace, the test fails.
⚙️ Background jobs. Celery, Graphile Worker, Kafka, RabbitMQ, SQS and Azure Service Bus. Kerno runs the job on a real worker and checks what it wrote and what it sent.
🤖 MCP servers. Kerno tests every tool your server exposes, including ones behind auth.
☁️ AWS serverless. SAM and Serverless Framework apps, including Lambdas triggered by SQS, DynamoDB and Cognito sign-in.
🧠 It learns your app. The first time, Kerno figures out how to sign in and how to set up test data. It saves that in your repo so you can read it and fix it if it got something wrong.
✅ CI. Your tests are committed to the repo, and our GitHub Action re-runs them on every PR.
You can try it here 👉 https://portal.kerno.io/register
It's free for 30 test runs a month, no credit card. Open source projects get it free.
I'd love to hear what you think, and what the worst bug an agent has snuck into your backend is 😅 I'll be here all day!