Next League · Product lab, 2026
From a product question to a working application.
Two research-led products: sponsored fan experiences with Proof, and AI-assisted event-copy review with Crosscheck.
- Role
- Product exploration and full-stack implementation within Next League’s product lab.
- Stack
- Next.js, TypeScript, OpenAI, Convex, Clerk
- Status
- Hosted product demonstrations
Proof’s live experience library: fan games, votes and quizzes.
Context
Sports teams need useful ways to create fan experiences and keep event information consistent. Proof addresses fan participation, while the companion Crosscheck product explores event-copy review.
What I did
- Built Proof’s activation studio, draft-to-publication flow, playable fan experiences, participation records and sponsor reports.
- Added rewards, replayable game interactions and reporting connections, with access controls and durable state.
- Built Crosscheck’s event briefs, copy comparison, structured AI fact extraction, supporting quotes and human-reviewed correction packets.
Engineering decisions
An AI proposal has a review step.
Crosscheck proposes facts from supplied copy and checks that supporting quotes exist in the text. A person reviews the meaning before saving. An exact quote establishes provenance; it does not automatically establish that the interpretation is correct.
Publishing is a state change.
Proof separates private edits from published fan experiences. Reports describe recorded participation, and the demonstration starts with illustrative properties rather than invented client results.
Keep the product useful without the model.
Manual fact entry and deterministic comparisons remain available when AI is unavailable. The model supports the workflow instead of owning the decision.
Scope
Hosted demonstrations and research-led pilots. No claim of commercial adoption, revenue impact or continuous monitoring of live websites.
Reviewed product documentation, implementation history and the project’s validation records. The portfolio does not independently certify commercial readiness.