Open to opportunities

Abhinit Rai

@abhinitrai

Message

I build high-throughput backend systems, trading infrastructure, and blockchain-native services.

India

Message

What I'm looking for

I'm focused on designing scalable protocol infrastructure, trading engines, and blockchain-native backend systems across DeFi, Web3, and fintech.

I've built backend platforms for Careem, Fi, and Hotstuff Labs, including a POS integration platform that scaled across 22k+ merchant outlets and handled 100k+ daily orders with 99.9%+ reliability.

At Hotstuff Labs, I led a Layer 3 trading server, launched an SDK for 10+ external developers, and designed real-time market-data aggregation across five crypto exchanges. At Fi, I built Temporal workflows supporting 1.5 million financial transactions daily and contributed to secure UPI services used by 100,000+ users.

I work across Golang, Rust, TypeScript, Python, cloud infrastructure, databases, and Web3 integrations to build scalable systems for fintech, DeFi, and trading products.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Careem

Sep 2025 - Jun 2026 (9 months)

Led development of a POS custom integration platform for enterprise vendors, reducing merchant onboarding time by 99% and scaling integrations across 22k+ merchant outlets. Architected end-to-end Order Creation and Real-time Order Tracking flows handling 100k+ daily orders with 99.9%+ reliability.

Microservices POS Integration Order Management Webhooks AWS Docker Kubernetes Kafka Redis PostgreSQL AI assisted Development

Senior Software Engineer

Hotstuff Labs

Jan 2024 - Jun 2025 (1 year 5 months)

Led design and implementation of a trading server for on-chain contract interactions on a Layer 3 blockchain. Developed a developer-friendly SDK and scalable data aggregation architecture consolidating feeds from five major crypto exchanges.

Rust Blockchain EVM Ethereum Arbitrum GETH Web3.js Redis MongoDB PostgreSQL AWS Docker Kubernetes Microservices Caching AI assisted Development

Software Developer

Feb 2023 - Jan 2024 (11 months)

Designed and implemented a scalable Temporal workflow architecture for financial transaction updates on a 2TB+ database, handling 1.5 million transactions daily. Developed UPI-related services including UPI Global for 100,000+ users.

Temporal Microservices PostgreSQL Redis MongoDB AWS Docker Kubernetes UPI SQL Optimization AI assisted Development

Software Developer

Nurture Farm

Jul 2022 - Dec 2022 (5 months)

Engineered a seller dashboard within the retail app consolidating critical business metrics, utilized by over 1000 sellers. Optimized database architecture by restructuring complex queries, enhancing response times and reducing latency.

Backend Development Database Optimization SQL Query Optimization

Software Development Engineer

Smarsh

Sep 2021 - Jun 2022 (9 months)

Developed a GitHub Actions workflow to automate JAR file creation, streamlining deployment and accelerating release cycles. Designed and implemented a seller dashboard integrating key business metrics, empowering over a thousand sellers.

Java Spring Boot Microservices Athena GitHub Actions gRPC SQL Database Optimization