Justin Leo
Justin Leo

Senior Rust and Backend Engineer

Open to offers · Member since 24 Sep 2026
Location
Binghamton, United States
Desired salary
Unspecified
Work preference
Hybrid / Full Time, Contract, Freelance
Experience level
Senior

About

Professional summary

I am a senior Rust and backend engineer specializing in high-performance systems, asynchronous programming, distributed services, and blockchain infrastructure.

I build production-grade services with Rust, Go, Python, TypeScript, SQL, Tokio, gRPC, REST APIs, GraphQL, and microservice architectures. I focus on concurrency, low latency, performance, reliability, and maintainable system design.

I have extensive experience developing Solana and DeFi infrastructure, including arbitrage engines, trading automation, on-chain programs, transaction simulation, routing, streaming, and integrations across multiple liquidity and order-book venues.

I also develop full-stack SaaS products using Node.js, NestJS, React, and modern frontend frameworks, backed by relational and NoSQL databases. My background includes service-management and healthcare collaboration applications.

I use Docker, GitHub Actions, Jenkins, and CI/CD workflows to support delivery, observability, metrics, and alerting. I have experience integrating Rust with Python through PyO3 and am expanding into Rust-based AI/ML infrastructure and LLM application development.

I enjoy translating complex product and operational requirements into reliable software systems and secure Web3 workflows. My work spans backend engineering, blockchain development, API design, database optimization, and production operations.

Skills

33 capabilities

Tech stack & tools

Working toolkit

Application Hosting

Development

Languages & Frameworks

Experience

Career history

Senior Blockchain & Backend Engineer Self-Employed

I build production Solana and DeFi trading infrastructure using asynchronous Rust and Go. My work includes 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 for reliable automated trading. I integrated more than 30 Solana venues across CLMM, CPMM, DLMM, DAMM, and order-book models, including Raydium, Meteora, Orca Whirlpool, Phoenix, and PumpSwap.

I also develop SaaS APIs and microservices with Tokio, Axum, Actix Web, and Gin. I created Rust-Python integrations using PyO3, developed a Tauri V2 application, and established observability, metrics, alerting, Docker-based delivery, and GitHub Actions CI/CD workflows.

Blockchain Developer Catheon Gaming (now Artisse Interactive)

I developed Solana on-chain programs in Rust and Anchor for play-to-earn gaming and NFT marketplace workflows. I implemented functionality for NFT minting, marketplace transactions, and token swaps.

I integrated blockchain transactions with backend services and frontend applications to deliver complete Web3 product workflows. I also applied multisig authorization and transaction-validation practices to improve contract reliability and operational security.

Full Stack Engineer Motili

I developed scalable HVAC service-management applications using Node.js, NestJS, and React. I designed REST APIs and optimized MySQL and MongoDB queries to improve application performance and reliability.

I integrated third-party services into SaaS workflows supporting field operations and service management. I worked closely with product and operations teams to translate HVAC service requirements into dependable software features.

Software Engineer ClickCare, LLC

I assisted with the development of a healthcare collaboration platform using JavaScript, SQL, and REST APIs. I built and tested web components, API integrations, and database queries.

I diagnosed application defects, documented fixes, and supported software releases. This role strengthened my experience with web application development, testing, database work, and production support.

Education

Learning history

Brooklyn College

Bachelor of Science, Computer Science

Bachelor of Science in Computer Science.

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