Java Web3 Jobs in New York, New York, United States

DeFi Developer — High-Performance Crypto Trading Systems (New York)

Our client is hiring a sharp, ambitious DeFi Developer to join their DeFi trading team building high-performance systems that operate directly on decentralized markets.

You’ll work hands-on across the full trading stack — from on-chain integrations and execution logic, to infrastructure, monitoring, and performance optimization.

What you’ll do

• Build and ship production-grade code (primarily Rust + Python)
• Develop systems that interact with on-chain protocols and infrastructure
• (Solidity, JSON-RPC, Solana, MEV workflows, etc.)
• Improve real-time monitoring, execution pipelines, and strategy tooling
• Debug and optimize end-to-end performance: latency, reliability, throughput
• Work with protocol teams and external projects to unlock new market opportunities
• Grow into end-to-end ownership across DeFi integrations and trading infrastructure

Why this role is unique

• Full systems exposure — infrastructure, execution, strategy logic, on-chain interaction
• DeFi at the core — learn how protocols work under the hood and how on-chain dynamics create edge
• Elite teammates — small, world-class group of engineers, quants, and traders
• Startup velocity — fast decisions, frequent shipping, immediate production impact

This is an ideal role for someone who sees themselves as a top technologist and wants to work in one of the most cutting-edge environments in finance and crypto.

What we’re looking for

We’re looking for driven developers who want to learn fast by working on hard, meaningful problems.

You should have:

• 3–7 years of professional software engineering experience
• Strong fundamentals and ability to write clean, testable, efficient code
• Solid CS foundation: algorithms, data structures, concurrency, networking, etc.
• Strong ownership mindset and clear communication

Signals of technical excellence (any of these helps):

• Top academic performance in CS / math / physics / engineering
• Competitive programming / olympiad success (ICPC, IMO, IOI, IPhO, etc.)
• Experience at a highly selective tech company, trading firm, or fund

Language & technical background

• Rust preferred, but you should be strong in at least one systems/statically typed language:
• C++ / Java / Go / C# / Kotlin / similar

Nice to have

Strong preference

• Understanding of trading systems, market structure, or strategy implementation

Bonus

• DeFi familiarity: smart contracts, blockchain APIs, MEV, Solana
• Rust experience
• Infrastructure/observability tools (AWS, Grafana, etc.)
• Strong math/stats background (modeling, simulation)

Team culture

Our client values:

• High ownership and initiative
• Curiosity, intellectual honesty, and rapid learning
• Clear, direct communication
• No ego, no politics — just building and improving together