What Proofline does
Review changes in their production context
Proofline connects a pull request to evidence about the infrastructure it will deploy into. It investigates failures that depend on permissions, capacity, database state, or the way services are deployed together.
Test concrete failure scenarios
Each investigation starts with a specific explanation of how the change could fail. Proofline tests that explanation against the code and environment evidence, then reports the findings it can support, with their impact and a proposed mitigation.
Put the evidence where engineers decide
Findings appear on the pull request, where the author and reviewer can act on them before merge. The console preserves review history and the evidence behind each finding for later inspection.
What makes Proofline different
The environment is an input
A change can look correct and still fail against production permissions or resource limits. Proofline builds a model from infrastructure sources and investigates the change against that environment.
A finding comes with its reasoning
Proofline explains the sequence that connects a code change to a possible production failure. Engineers can inspect the supporting evidence and evaluate the proposed correction.
Every review has a fixed reference point
Reviews refer to an exact commit and a recorded snapshot of the target environment. The evidence stays tied to that review even as the code and infrastructure change.
Missing evidence stays visible
When evidence is missing, stale, or unreachable, Proofline reports an incomplete review and names the cause. Engineers can see what remains unresolved before deciding how to proceed.
You can watch before switching it on
Design partners begin with a shadow run: reviews are available to inspect without posting comments or holding deployments. You decide when to enable published reviews and optional deployment protection.
Who Proofline is for
We are working with a small group of design partners. The strongest fit is a team using GitHub and AWS, with multiple production services and someone responsible for infrastructure or reliability.
- Cloud-native software companies with roughly 20 to 150 engineers and frequent production releases.
- Platform and infrastructure teams reviewing changes across services, databases, and deployment configuration.
- Engineering leaders responsible for availability, incident costs, and release decisions.
The team behind Proofline
Mohsen Azimi, founder
Mohsen's engineering background includes Google, Lyft, Airbnb, and ElevenLabs. He worked on the team managing staging at Airbnb, built Swagger Editor, and contributed to OpenAPI.
Proofline brings that experience to a recurring problem: understanding how a proposed change will behave in the environment it reaches. Code review and testing leave engineers with deployment questions that require evidence from production itself.
Based in Berlin, Mohsen leads product development and works directly with design partners on onboarding and feedback. Reach him at hello@proofline.sh.
Why we are building it now
Coding agents can produce an entire pull request, but understanding its production consequences still takes work. Cloud APIs and infrastructure configuration give Proofline concrete evidence to bring into that review.
How Proofline works
Start with one deployment path
Tell us how a representative service is built and deployed, what it depends on, and which failures you want to investigate. We prepare a compatibility and onboarding plan for one repository, one environment, and one deployment path.
Connect with our help
We install the GitHub App with you and configure the read-only AWS access and connectors your deployment path needs. We discuss access restrictions and any missing integrations before starting the evaluation.
Evaluate together
Inspect the shadow reviews with us, discuss useful findings and mistakes, and decide when to enable comments. You work directly with the founder through email and calls; setup timing depends on your infrastructure and access requirements.
Participation is free for design partners at this stage. We also offer deployment inside your own AWS account for teams that need it.
Contact us to plan an evaluation.
Frequently asked questions
Does Proofline change my production infrastructure?
Proofline collects infrastructure evidence through read-only access. During onboarding, we agree on the permissions needed for the deployment path you want reviewed.
Does Proofline block merges?
Pull-request reviews are advisory and do not block merges. Teams can separately opt into deployment protection through GitHub.
What does a review with no findings mean?
It means no supported finding emerged from the evidence available to that review. Deployment risk can remain, and missing or stale evidence is reported explicitly.
Which tools does Proofline work with?
The current design-partner scope centers on GitHub, GitHub Actions, and AWS. Infrastructure sources also include Kubernetes, Terraform, OpenTofu, Docker Compose, and Backstage; we confirm the fit for your deployment path during onboarding.
Can we try it before enabling comments?
Yes. The evaluation starts in shadow mode, so you can inspect what Proofline would report before enabling comments or deployment protection.
How do we get started?
Send us a message or write to hello@proofline.sh. We will discuss whether Proofline fits your environment and choose a deployment path to evaluate together.