Role: Main developer — owned the platform end-to-end: the Next.js trading UI, the Rust indexer/backend, the on-chain integration, and CI/CD.
feels-indexer in Rust on Tokio over a four-backend storage layer — PostgreSQL for analytics, RocksDB for raw account state, Redis for hot cache, and Tantivy for token search. Discriminator-routed Borsh deserialization across 10+ Solana account types and on-chain event types, exposed via ~40 REST endpoints with Scalar OpenAPI docs and Prometheus metrics.
Key Features
- Rust indexer on Tokio over a four-backend storage layer (PostgreSQL, RocksDB, Redis, Tantivy)
- Discriminator-routed Borsh deserialization across 10+ Solana account and event types
- ~40 REST endpoints with Scalar OpenAPI docs and Prometheus metrics
- Mock Geyser (localnet/CI) and Yellowstone gRPC (devnet/mainnet) streaming via Cargo feature flag
- Redis pub/sub for hot-path cache invalidation
- Tantivy full-text search for token discovery
Tech Stack
Indexer
Storage & Search
Solana & Web3
Testing & Observability
Frontend
Challenges & Solutions
Indexing High-Volume On-Chain State
Deserializing and serving 10+ Solana account types and on-chain events at trading-app latency needs more than a single database can offer.
Built a Rust indexer on Tokio over a four-backend storage layer — PostgreSQL for analytics, RocksDB for raw account state, Redis for hot cache, and Tantivy for token search — with discriminator-routed Borsh deserialization and a Cargo feature flag switching between mock Geyser and Yellowstone gRPC streaming.
Slow, Flaky Full-Stack Tests
On-chain integration tests against a live validator were slow and non-deterministic, and env drift between frontend, RPC, indexer, and on-chain program made failures hard to trust.
Built a two-lane Playwright setup — a deterministic test-wallet lane and a LiteSVM in-memory RPC lane — and added a deployment-coherence pre-check asserting frontend env, RPC, indexer URL, program ID, and token mints all match before any product assertion runs.
Untrusted Browser-to-Indexer Access
A trading SPA talking directly to the indexer from the browser opens cross-origin fetch and token-leak risks, and the boundary erodes the moment any component reaches for a raw fetch.
Routed all browser-to-indexer traffic through a single API proxy as the only ingress, and enforced it with a custom ESLint rule that bans raw cross-origin fetch in the app, removing whole classes of CSRF and token-leak bugs.