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Bandit Engine API for Feature Flags
Create a developer-focused API or plugin that computes new variant weights and writes them back into existing flag systems. This targets teams that already have analytics and delivery infrastructure but lack adaptive optimization logic.
Why this matters
You do not necessarily want a full experimentation suite. You already have event tracking, a feature flag service, and a delivery path that works. The missing piece is the decision engine that turns experiment results into updated rollout weights. Rebuilding that in-house is possible, but it adds statistical, operational, and maintenance burden for something that should behave predictably in the background. What you want is an API-first layer that plugs into your current stack, reads outcomes, computes updated allocations on a schedule, and writes those percentages back without forcing changes to the performance-critical serving path.
- · Built for Developer teams that maintain their own feature flag systems or use existing flag platforms and want adaptive allocation without replacing current infrastructure..
- · Most likely monetization: SaaS subscription.
The Pain · Narrative
You do not necessarily want a full experimentation suite. You already have event tracking, a feature flag service, and a delivery path that works. The missing piece is the decision engine that turns experiment results into updated rollout weights. Rebuilding that in-house is possible, but it adds statistical, operational, and maintenance burden for something that should behave predictably in the background. What you want is an API-first layer that plugs into your current stack, reads outcomes, computes updated allocations on a schedule, and writes those percentages back without forcing changes to the performance-critical serving path.
Score Breakdown
Market Signal
Go-to-Market
Engineering-led SaaS teams already using feature flags in production and comfortable adopting infrastructure-style APIs.
~20K-50K teams globally
Hacker News launch
$299/month
5 design partners connect an existing flag system and complete one full adaptive rollout cycle in 30 days
MVP Scope · 1–2 weeks
- Define a generic experiment and variant weight API
- Implement one connector for a popular flag platform
- Build a background job that reads aggregate conversion counts
- Implement write-back of updated percentage allocations
- Add a dry-run mode that logs suggested changes without applying them
- Ship a second connector to validate abstraction quality
- Add simulation tooling for historical replay on past experiment data
- Implement rate limits and rollback controls for unsafe updates
- Create API docs and sample integration code
- Add a minimal dashboard for current weights and applied changes
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Teams with enough engineering sophistication may decide to build this internally rather than pay for an external optimization layer.
- 2Connector maintenance across many flag systems can become expensive and slow product velocity.
- 3If users want end-to-end analytics and reporting, an API-only product may feel incomplete compared with broader platforms.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
The prototype discussion reveals a concrete implementation pattern: use existing metric outputs, run an allocator in the background, and update feature flag splits without touching the request path. That signals demand for a modular layer rather than only a full product. Multiple comments imply the integration path matters as much as the algorithm itself, which supports an API or plugin strategy aimed at developer-led teams.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Validate
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Headline
Bandit Engine API for Feature Flags
Sub-headline
Create a developer-focused API or plugin that computes new variant weights and writes them back into existing flag systems. This targets teams that already have analytics and delivery infrastructure but lack adaptive optimization logic.
Who It's For
For Developer teams that maintain their own feature flag systems or use existing flag platforms and want adaptive allocation without replacing current infrastructure.
Feature List
✓ API for experiment config and goal metrics ✓ Scheduled or event-driven weight recalculation ✓ Connectors for common feature flag platforms ✓ Write-back engine for percentage rollouts ✓ Simulation and dry-run mode before activation
Where to Validate
Share your landing page in r/GitHub · PostHog/posthog — that's exactly where these pain points were discovered.
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