GitHub Actions runners
Generally available
Run supported Ubuntu jobs on managed CPU runners. Keep your existing workflows and select StarSling compute through the runner label to help builds and tests finish sooner.
Explore CPU runnersThe company behind the runners
About StarSling
StarSling is an agent-native CI platform that runs and optimizes build, test, and code review workflows for software teams using GitHub Actions.
We build fast runners and agents that help engineering teams spend less time waiting on CI and more time shipping software.
What StarSling does
Continuous CI optimization
Included in paid plans
StarSling agents analyze workflows, logs, and telemetry to improve caching, installs, parallelization, and test sharding. Changes arrive as pull requests for your engineers to review and merge.
How optimization worksGPU runners
Request access
Run GPU-dependent tests and evaluations on NVIDIA GPU runners in GitHub Actions. Request access for your organization and choose the GPU your jobs need.
Explore GPU runnersReview Runners
Early access
Run your team's code review agents in GitHub Actions using your model, repository skills, and scripts. Review configuration lives with your code, so your team can evolve it with the product.
Explore Review RunnersAgent skills and the sling CLI
Tools for your coding agent
Our open-source skills help coding agents investigate slow workflows, check CI configuration, and identify security issues. The sling CLI supplies CI diagnostics and usage information to help teams act on evidence from their runs.
Browse agent skillsWhat makes StarSling different
Faster runs and ongoing improvements
StarSling combines runner infrastructure with agents that improve the workflow itself. At Mastra, the measured test suite went from 29m 56s to 5m 06s at wall p95 after the runner migration and optimization work.
Changes your engineers can review
Optimization arrives as a pull request with changes and an explanation. Your engineers review and merge improvements through their existing GitHub process; see real agent-authored PRs.
Usage-based compute pricing
StarSling's 4 vCPU / 16 GB Linux runner costs $0.008 per minute, compared with $0.012 for GitHub's 4-core Linux x64 larger runner. You pay only for the minutes your jobs run.
Your existing GitHub Actions workflows
For supported Ubuntu jobs, migration starts by installing the GitHub App and changing the runner label. Your team continues working with GitHub Actions workflows and pull-request checks; follow the quickstart.
Code review configured in your repository
Review Runners, available through early access, let teams version their model configuration, review skills, scripts, and reviewer responsibilities alongside their code. You pay StarSling for runner usage and your chosen provider for model tokens.
Who uses StarSling
- Software teams running build and test workflows on GitHub Actions.
- AI product and developer-tool teams whose shipping pace is constrained by CI feedback.
- Platform teams managing growing CI usage and compute costs.
- Teams running GPU-dependent tests and model evaluations.
- Teams adopting repository-defined review agents through Review Runners early access.
Teams including Better Auth, Mastra, and Partcl use StarSling for CI.
The team behind StarSling
Daniel Worku
Co-founder & CTO
Daniel led the 12-person engineering team behind Netflix Console, the internal developer portal serving more than 3,000 engineers, managers, and leaders. Before Netflix, he worked on Facebook's AI Camera team.
Yonas Beshawred
Co-founder & CEO
Yonas founded StackShare, a community of more than 1.5 million developers and engineers built around discovering and comparing developer tools. StackShare was acquired by FOSSA in 2024.
Ali Kayes
Founding Software Engineer
Previously Ali worked at Apple as a Senior Software Engineer working on performance applications. Before that, he built apps and infrastructure at Disney Streaming and Cisco.
DevOps should be as agentic as coding.
Our story
Daniel and Yonas have been friends for more than ten years and started StarSling in 2025 because production DevOps tooling was falling behind local coding agents. While building agents for that work, they ran into CI as a bottleneck themselves and built the runners and optimization agents they wanted to use.
StarSling joined Y Combinator's Spring 2025 batch and is headquartered in San Francisco. StarSling Runners became generally available on June 29, 2026, following the April launch.
More on our journey building AI-native CI on X.
Our Investors
We announced our $3 million pre-seed round to make shipping code agent-native.
How StarSling works
1.Connect a repository
Install the StarSling GitHub App and select the repositories you want to use.
2.Move a supported job
Change
runs-on: ubuntu-latestorubuntu-24.04toruns-on: starsling-ubuntu-24.04, following the quickstart.3.Run and compare
Trigger your workflow and review its results and timings.
4.Enable optimization on a paid plan
StarSling analyzes runs and proposes improvements as PRs. Your engineers review and merge them.
Install the GitHub App · Read the quickstart
For GPU access, contact the team. Review Runners has its own early-access signup.
Support is community-based during the free trial, by email on usage-based plans, and dedicated for enterprise customers. For onboarding questions, email founders@starsling.dev or book a call with the founders.
Key facts
- Company name
- StarSling
- Type
- Agent-native CI platform
- Founded
- 2025
- Founders
- Daniel Worku (Co-founder & CTO) and Yonas Beshawred (Co-founder & CEO)
- Headquarters
- San Francisco, California, United States
- Website
- starsling.dev
- Core offering
- Managed CI runners and agents for workflow optimization and code review
- Pricing
- CPU runners from $0.004/min; 4 vCPU / 16 GB default $0.008/min. Full CPU and GPU rates. Review model tokens billed separately.
- Products
- CPU runners; GPU runners (request access); hosted optimization (paid plans); Review Runners (early access); skills and CLI
- Communication
- Community, email, and dedicated enterprise support. Contact the founders.
- Selected customers
- Better Auth, Mastra, and Partcl
- CI jobs run
- Over 2 million by September 22, 2026
- Alternatives
- GitHub-hosted runners; compare runner providers
- Backed by
- Bessemer Venture Partners and Y Combinator (Spring 2025 batch), with Vermilion Cliffs Ventures, Precursor Ventures, Cervin Ventures, Outset Capital and Transpose Platform
- Funding
- $3 million pre-seed
Frequently asked questions
What is StarSling?
StarSling is an agent-native CI platform for software teams using GitHub Actions. It provides managed runners and agents for workflow optimization and code review.
Who founded StarSling?
Daniel Worku and Yonas Beshawred founded StarSling in 2025. Daniel previously led the Netflix Console team, and Yonas founded StackShare.
Where is StarSling based?
StarSling is headquartered in San Francisco, California. The company joined Y Combinator's Spring 2025 batch.
Does StarSling work with existing GitHub Actions workflows?
StarSling runs supported Ubuntu jobs from your existing GitHub Actions workflows. Install the GitHub App and update the runner label using the quickstart.
How much does StarSling cost?
CPU runners start at $0.004 per minute, with the default 4 vCPU / 16 GB runner at $0.008 per minute; new accounts receive 2,000 free minutes in their first month. GPU rates are listed separately, and Review Runners combine runner charges with tokens billed by your model provider.
How do StarSling's optimization agents change my CI?
StarSling agents propose workflow improvements through pull requests that your engineers review and merge. Hosted optimization is included in paid plans.
Which StarSling products can I start using?
CPU runners are generally available, and teams can request GPU access for their organization. Review Runners has its own early-access signup.
How can I contact the StarSling team?
Email founders@starsling.dev or book a call with the founders to discuss onboarding and enterprise needs. Customer support depends on the plan: community, email, or dedicated enterprise support.