Senior/Staff Java Engineer - Web3 Wallet Defi Earn

OKX; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

OKX is building the next generation of open platforms at the intersection of Web3 and AI. We are seeking an experienced backend engineer to design, build, and optimize the Wallet Earn on-chain aggregated investment platform.

You will own architecture for critical services, ensure high availability, and push the boundaries of DeFi, AI Agents, and Web3 infrastructure, collaborating with product and security teams to deliver reliable, scalable systems.

Qualifications

• Solid Java fundamentals with Spring Boot and Spring Cloud.
• Hands-on experience with MySQL, Redis, MQ, RPC.
• Proven experience building high-concurrency, high-availability distributed systems.
• Familiarity with DeFi protocols and on-chain concepts; smart contract basics preferred.
• Strong ownership, communication, and collaboration in fast-moving teams; interest in Web3, DeFi, or AI Agents.

Responsibilities

• Design, build, and optimize the backend architecture for Wallet Earn on-chain aggregated investment platform.
• Design and build the aggregated-investment risk control platform, ensuring system stability, fund safety, and business scalability.
• Continuously improve protocol integration capabilities, raising onboarding efficiency and R&D velocity.
• Contribute to the multi-chain user asset/position platform, ensuring real-time data accuracy across major chains and DeFi protocols.
• Contribute to the AI Agent Marketplace core platform, owning the architecture and development of Agent, Task, and Order modules.
• Own stability across core business flows to ensure high availability and performance; diagnose and resolve production issues.
• Continuously improve system architecture, code quality, monitoring/alerting, observability, and exception-compensation capabilities to strengthen reliability.

Skills

Java

Spring Boot

Spring Cloud

Distributed systems

System architecture design

Performance tuning

Log analysis

Ownership & accountability

Web3/DeFi interest

Communication

Tools

MySQL

Redis

MQ

RPC

On-chain integration

Job description

Who We Are

At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom.

OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves.

Across our multiple offices globally, we are united by our core principles: We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er.

About the Opportunity

We're building the next generation of open platforms at the intersection of Web3 and AI — secure, open, and high-performance products and infrastructure spanning DeFi and the AI Agent ecosystem, designed to bring smarter Web3 experiences to users worldwide.

The team is focused on two core directions:

• Wallet Earn — A one-stop on-chain aggregated investment platform that lets users easily access leading DeFi protocols such as Aave, Morpho, Pendle, and Pancake, with seamless deposit, redemption, and yield management, continuously lowering the barrier to DeFi participation.
• AI Agent Marketplace — An open marketplace and infrastructure layer for AI Agents, built around core primitives like Agent, Task, and Order. It enables agents to autonomously accept tasks, complete work, earn rewards, build reputation, and collaborate with other agents to create value.

Responsibilities

• Design, build, and continuously optimize the backend architecture of the Wallet Earn on-chain aggregated investment platform.
• Design and build the aggregated-investment risk control platform, ensuring system stability, fund safety, and business scalability.
• Continuously improve protocol integration capabilities, raising both new-protocol onboarding efficiency and overall R&D velocity.
• Contribute to the multi-chain user asset/position platform, supporting asset parsing and display across major public chains and DeFi protocols; expand new protocols and asset types while keeping position data accurate, real-time, and efficient.
• Contribute to the AI Agent Marketplace core platform, owning the architecture and development of core modules such as Agent, Task, and Order, and explore integration scenarios between AI Agents and Web3.
• Own stability across core business flows to ensure high availability and high performance; independently diagnose and resolve complex production issues including performance bottlenecks, data consistency, fund safety, and edge-case business scenarios.
• Continuously improve system architecture, code quality, monitoring/alerting, observability, and exception-compensation capabilities to strengthen reliability, security, and maintainability.

Requirements

• Solid Java fundamentals with strong command of mainstream frameworks such as Spring Boot and Spring Cloud.
• Hands‑on experience with common middleware including MySQL, Redis, MQ, and RPC.
• Proven experience building high‑concurrency, high‑availability distributed systems.
• Familiarity with the design and mechanics of major DeFi protocols (e.g., Aave, Morpho, Pendle, Pancake); understanding of smart contract fundamentals, with on‑chain integration or contract development experience a plus.
• Familiarity with mainstream wallet products and account models, and a working understanding of on‑chain assets and the DeFi ecosystem.
• Strong systems analysis and architecture design skills, ideally from large‑scale consumer (To C) products or financial systems; able to independently own core‑module design and drive complex projects to high‑quality delivery.
• Ability to independently analyze and resolve complex production issues, with experience in log analysis, distributed tracing, performance tuning, fault recovery, and data‑consistency governance.
• Strong sense of ownership and accountability, proactively driving problems and projects to resolution.
• Strong communication and collaboration skills, comfortable in a fast‑moving business environment; genuine interest in Web3, DeFi, or AI Agents and a drive to keep exploring frontier technology.

Nice-to-Haves

• Familiarity with account models, transaction mechanics, and underlying principles of major public chains such as EVM, Solana, and Tron.
• Experience building high‑concurrency trading systems, core financial systems, or payment systems.
• Understanding of on‑chain risk control, KYT, and AML mechanisms.
• Platform development experience with AI Agents, LLMs, MCP, Function Calling, A2A (Agent-to-Agent) protocols, or Workflow systems.
• Competitive compensation and a long‑term incentive plan.
• Comprehensive insurance coverage for employees and their families.
• An international team, an open engineering culture, and rich opportunities for technical growth.
• Deep involvement in frontier Web3 × AI work, building next‑generation open infrastructure alongside outstanding engineers.
• Additional benefits will be detailed later in the hiring process.

As set forth in OKX’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.