Looking for a job

Justin Leo

@justinleo

Senior backend engineer building Solana trading infrastructure and Rust services for SaaS applications.

As a Senior Blockchain & Backend Engineer, I build Solana and DeFi trading infrastructure using async Rust and Go, including a low-latency multi-venue arbitrage engine, Drift Protocol automation, and Rust/Anchor on-chain programs.

I implemented Yellowstone gRPC streaming, self-hosted Jupiter routing, Jito bundle submission, and transaction simulation. I also integrated more than 30 Solana venues and order-book models.

For SaaS applications, I built REST APIs and microservices with Rust and Go, and developed Rust-Python integrations using PyO3 for performance-sensitive processing and AI/ML experimentation.

Earlier, I developed Solana programs for Catheon Gaming (now Artisse Interactive), SaaS applications at Motili, and healthcare collaboration software at ClickCare, LLC. I’ve also built a Tauri V2 desktop application and supported production delivery with Docker, GitHub Actions, and CI/CD workflows.

Experience

Work history, roles, and key accomplishments

Current

Senior Blockchain & Backend Engineer

Current

Self-Employed

May 2023 - Present (3 years 5 months)

Built production Solana and DeFi trading infrastructure using async Rust and Go, including a low-latency multi-venue arbitrage engine, Drift Protocol automation, and Rust/Anchor on-chain programs. Implemented Yellowstone gRPC streaming, self-hosted Jupiter routing, Jito bundle submission, and transaction simulation for reliable trading automation.

Rust Go Solana Anchor SPL Drift Protocol Jupiter Jito Helius Yellowstone GRPC DeFi Tokio Axum Actix Web Gin gRPC REST APIs Microservices PyO3 Tauri TypeScript Docker GitHub Actions CI CD

Blockchain Developer

Catheon Gaming

May 2022 - May 2023 (1 year)

Developed Solana on-chain programs in Rust and Anchor for P2E gaming and NFT marketplace workflows, enabling reliable blockchain features for game and digital-asset products. Implemented on-chain functionality for NFT minting, marketplace transactions, and token swaps, and integrated blockchain transactions with backend services and frontend applications.

Rust Anchor Solana NFT Web3 Multi Signature Wallets Transaction Verification

Fullstack Engineer

Motili

Feb 2016 - Sep 2021 (5 years 7 months)

Developed scalable HVAC service-management applications using Node.js, NestJS, and React. Designed REST APIs and optimized MySQL and MongoDB queries for stronger application performance and reliability.

NodeJS NestJS React REST APIs MySQL MongoDB SaaS

Software Engineer

ClickCare, LLC

Jun 2013 - Nov 2015 (2 years 5 months)

Assisted in developing a healthcare collaboration platform using JavaScript, SQL, and REST APIs, helping deliver core features for healthcare users. Built and tested web components, REST API integrations, and database queries in MySQL, Oracle Database, and MongoDB.

JavaScript SQL REST APIs MySQL Oracle Database MongoDB Jenkins