Back End Developer (Node.Js, AWS)

• Design and develop enterprise-grade wallet solutions (HD/Multi-Sig/MPC)
• Build and optimize blockchain data engine for multi-chain ingestion
• Implement Account Abstraction architectures (ERC-4337/3009/2771)
• Develop transaction orchestration systems (Bifrost)
• Build blockchain indexing engines for real-time data processing
• Implement security mechanisms using MPC, HSM, KMS, and key rotation
• Develop high-performance backend systems using Redis, Kafka, and microservices
• Ensure compliance with financial-grade security standards
• Collaborate with cross-functional teams for blockchain integration

• Proficient in Node.js / Java (Node.js preferred due to the API-centric system design)
• Strong understanding of EVM, smart contracts, event logs, ABI, and gas mechanics
• Hands-on experience with Web3.js / ethers.js
• Ability to read and interpret Solidity smart contract audits
• Experience with multi-chain ecosystems such as Ethereum, Base, Arbitrum, Optimism
• Experience building blockchain indexing engines
• Experience designing Account Abstraction (AA) architectures (ERC-4337)
• Experience developing high-performance backend systems using Redis, Kafka, microservices
• Security-related experience with MPC, HSM, KMS, and key rotation

• Previous experience in banking, fintech, or cryptotech companies
• Experience working on PoC projects, public-chain products, or CBDC/STO initiatives
• Understanding of financial compliance requirements
• Experience with stablecoin or digital asset platforms

• Attractive salary and bonus will be discussed after going through CV & Interview
• Topik allowance
• Review capacity annually and adjust salary increases according to work performance.
• Health care: Premium health insurance, Annual health check-up
• Young working environment
• Good career development opportunities with interesting and challenging projects.
• English, Korean, technical, soft skills training courses.
• Opportunity to learn special courses, new technology and security.
• Gifts on holidays (April 30th - May 1st, September 2nd, Tet, etc.)
• Outdoor activities with company support: sports clubs, team building, happy hour parties, birthdays, travel, employee and family events, etc.
• Working hours: 8 hours from Monday - Friday (8 hours/day)

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