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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.

• Competitive total compensation
• Comprehensive insurance coverage for employees and their dependants
• More that we love to tell you along the process!