Skillexify

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Inspiration

We wanted to solve a real problem faced by developers and job seekers: it’s easy to claim skills, but hard to prove them in a verifiable way. Recruiters waste time guessing, while genuine talent often goes unnoticed. Skillexify was born to create a transparent, privacy-preserving, and gamified way to showcase authentic technical skills that can be trusted by employers and communities.

What it does

Skillexify verifies technical skills from platforms like GitHub, LeetCode, Kaggle, Stack Overflow, and HackerRank — using zkTLS and XION blockchain. Users connect their accounts, and the app pulls real activity, rankings, and contributions. This generates a “Proof of Skill” NFT badge, stored immutably on-chain. Skills are gamified with leaderboards, evolving NFTs, and reputation scores. Recruiters and collaborators can instantly verify the authenticity of a user’s expertise.

How we built it

Frontend: React Native + Expo with a cyberpunk-themed UI. APIs: GitHub REST API, LeetCode GraphQL, Stack Overflow API, Kaggle API, HackerRank (demo). Blockchain: CosmWasm smart contracts on XION for proof storage, NFT evolution, and community features. zkTLS: Zero-knowledge TLS framework for secure and privacy-preserving verification. Tools: TypeScript, Docker, Rust (for contracts), Jest, ESLint.

Challenges we ran into

Integrating multiple platform APIs with very different data formats. Ensuring zkTLS worked smoothly without exposing sensitive user data. Designing NFT evolution logic that fairly represents real skill growth. Optimizing blockchain transactions for low gas fees while keeping it secure. Transitioning from web-first prototypes to a mobile-ready app.

Accomplishments that we're proud of

Successfully built a fully functional mobile-first app, not just a demo. Integrated real APIs and connected them to blockchain contracts. Implemented zkTLS end-to-end, ensuring trust and privacy together. Created dynamic NFTs that evolve as skills improve. Delivered a production-ready system that can be used by developers, recruiters, and communities.

What we learned

How to integrate zkTLS with blockchain infrastructure for practical use cases. The importance of user experience when merging complex tech like ZK proofs + blockchain + APIs. How to design gamified incentives (NFTs, leaderboards) that encourage professional growth. The value of making verifiable skills beneficial for both developers and recruiters.

What's next for Skillexify

Launching an Android app version to make it accessible for a wider audience. Expanding to more platforms (Codeforces, LinkedIn, Coursera, etc.). Adding job-matching features where recruiters can directly connect with verified talent. Building skill-based communities with exclusive hackathons, NFTs, and mentorship programs. Exploring enterprise adoption, so companies can verify candidate skills instantly during hiring.