Senior Java Engineer, Smart Contract Wallet Team

OKX • Contract • Hong Kong, Hong Kong SAR • 1d ago

Who We Are

At OKX, we believe that the future will be reshaped by Crypto, ultimately contributing to every individual's freedom. OKX began as a crypto exchange giving millions of people

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. OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more.

Responsibilities

Responsible for the design and development of the Java SDK for the AA (Account Abstraction) Wallet system, aiming to create a high-performance, modular, and extensible developer toolchain to enhance the efficiency and developer experience of business teams integrating smart contract capabilities.
Responsible for the engineering integration of on-chain protocols and off-chain services, including smart contract interface encapsulation, on-chain data structure parsing, event listening and handling, and signature/transaction modules, to provide secure and stable foundational capabilities for internal teams and ecosystem partners.
Participate in the Java-side implementation of core AA Wallet functionalities, covering the design and deployment of modules such as account systems, permission management, recovery mechanisms, multi-chain compatibility, and batch execution.
Collaborate deeply with the Smart Contract team to abstract on-chain capabilities and promote the standardization and componentization of the SDK and tool frameworks, realizing a continuously evolving architectural system.
Drive the capability development for multi-chain adaptation (EVM / Solana / Sui, etc.), and be responsible for the implementation of cross-chain interaction logic and multi-chain data processing on the Java service side.
Participate in architectural reviews, technology selection, and the formulation of engineering standards to continuously improve the overall engineering quality, development efficiency, and security of the team.

Requirements

1+ years of experience in Web3-related fields, understanding of public blockchain operating principles, and familiarity with the invocation methods and basic data structures of EVM or Solana smart contracts.
Solid foundation in Java, familiarity with multi-threading, concurrency models, and network communication principles, along with excellent coding habits and engineering practice abilities.
Familiarity with common open-source technology stacks and middleware (at least one of the following): Kafka, RocketMQ, gRPC, Dubbo, Redis, MySQL, Elasticsearch, caching systems, Spring/Spring Boot, etc. Experience in reading source code is a plus.
Proficiency in mainstream Java frameworks such as Spring Boot / Spring MVC / Spring Cloud / MyBatis, with experience in the architecture and development of complex backend systems.
Experience in the design and development of large-scale Java projects, capable of architectural decomposition and performance optimization in complex business scenarios.
Possess rapid learning ability, good communication skills, and team collaboration spirit; proactive thinking, capable of independently locating and solving problems.
Strong sense of responsibility, ownership, and a spirit of technical exploration.

Nice-to-Haves

Experience in Solidity development, familiar with Ethereum contract execution mechanisms, development processes, and common tools.
Familiarity with the smart contract development and runtime environments of emerging public chains such as Solana / Sui / Aptos.
Familiarity with cutting-edge fields such as ZK technology, Web3 wallet systems, ERC-4337 / EIP-7702, and cross-chain protocols.
Ability to communicate fluently in English, including reading documentation, participating in meetings, or code reviews.

Perks & Benefits

Competitive total compensation
Comprehensive insurance coverage for employees and their dependants
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