Simranjeet Singh

•High-traffic platform: scaled systems supporting $30M+ user deposits and thousands of concurrent users. •Reduced API latency by 60% on high-read endpoints via cache-first Redis and query optimization. •Built unified identity and auth layer: single-session UX across multiple products, cut auth fragmentation. •Architected pokemon cards marketplace platform: intake-to-settlement pipeline, trade APIs, and portfolio reads. •Automated catalog with LLM-powered OCR pipelines (Telegram, MCP): cut manual catalog time by 80%. •Implemented RAG + vector search: image-based retrieval, pricing signals, human-in-the-loop checkpoints. •Designed async settlement system: request lifecycle modeling, share accounting, delayed fulfillment. •Built user activity verification system with gas sponsorship: frictionless onboarding for mainstream users. •Tech: NestJS, Node.js, PostgreSQL, Redis, Ponder, OpenTelemetry, Telegram API, MCP, LLM OCR

•Led 4-engineer React Native team on AI social platform across mobile growth, creator tools, and 50K+ MAU. •Drove 20% user growth via onboarding and engagement redesigns: simplified flows for mainstream users. •Boosted session time 35% via state and query optimization: eliminated re-renders and data-flow inconsistencies. •Shipped in-app marketplace: external service integrations, subgraph-indexed APIs, real-time data. •Migrated to in-house auth and session layer: reusable identity management across multiple products. •Added profile identity layer: user naming, social graph integration, and consistent cross-product presence. •Tech: React Native, Expo, TanStack Query, Zustand, Web3Auth, GraphQL, Subgraphs

•Financial trading platform: built concentrated-liquidity swap UI with LP management and position tracking. •Adapted financial math (liquidity ranges, fee tiers, position accounting) into clean user-facing product UX. •Rebuilt V2 product from legacy codebase: modern component architecture and clean data-flow separation. •Built transaction-state UX for high-frequency users: pending vs. confirmed clarity, reduced async confusion. •Implemented analytics pipelines: TVL, volume, and position data surfaces for product and trader views. •Separated ingestion, read models, and UI state: cut debug time and reduced coupling as complexity grew. •Tech: React, TypeScript, Rust (protocol debugging), Firebase, Hasura, Cloud Functions

•Digital collectibles and fantasy gaming platform: scaled TopRun marketplace APIs supporting 10K+ DAU. •Built marketplace + admin APIs: orders, listings, auctions, with sub-200ms response times under load. •Cut MTTR (mean time to recovery) 50% via observability-first logging, health checks, and alert triage. •Unified external event indexing via subgraph-based pipelines: eliminated raw API reads, improved consistency. •Migrated from MongoDB to PostgreSQL + Sequelize: stronger relational model and improved query performance. •Tech: Node.js, PostgreSQL, Sequelize, MongoDB, Subgraphs, NFT marketplace, Ethereum

•Built reusable React components and state-driven workflows for verification-heavy SaaS products. •Implemented typed Redux patterns for form states, error handling, and conditional dashboard views. •Shipped modular UI modules with TypeScript-first discipline in sprint-style delivery cycles. •Tech: React, TypeScript, Redux, dashboard UX, component architecture.