I. Responsibilities

1. Core Backend Design & Implementation for the DEX Aggregator

• Design and implement core backend services for the DEX aggregator.

  • Define the overall technical architecture and core transaction flows of the DEX aggregator.

  • Design key logic including routing, price quoting, slippage control, fee calculation, and fallback handling for failed transactions.

  • Produce complete technical design documents, organize reviews, and drive implementation.

2. Aggregation Engine & On-Chain Protocol Integration

• Integrate and optimize connections with on-chain protocols.

  • Interface with major DEX protocols such as Uniswap V2/V3, PancakeSwap, SushiSwap, Curve, Balancer, etc.

  • Support multi-chain environments including Ethereum, BSC, Arbitrum, Base, Polygon, and others.

  • Implement multi-pool, multi-path order splitting and optimal price routing strategies.

3. On-Chain Interaction & Transaction Execution Pipeline

• Design and implement the full on-chain swap execution pipeline.

  • Build transaction workflows covering construction, simulation, signing, broadcasting, and receipt confirmation.

  • Collaborate with wallet, account, signing, and gas strategy services.

  • Ensure high transaction success rates, fast confirmations, and robust exception handling and rollback mechanisms.

4. Service Stability & Security

• Build stability and security mechanisms for the DEX aggregator services.

  • Work with risk control and security teams to design transaction risk controls, rate limiting, blacklists, and anomaly detection mechanisms.

  • Mitigate risks such as price manipulation, MEV, slippage attacks, replay attacks, and other on-chain threats.

  • Ensure stable operation under high concurrency and high-frequency trading scenarios.

5. Engineering Excellence & Collaboration

• Maintain strong engineering discipline and collaboration skills.

  • Follow best practices in code quality, unit testing, and technical documentation.

  • Work closely with frontend, wallet, risk, and product teams to deliver high-quality releases.

II. Requirements

Core Technical Skills

• Bachelor’s degree or above in Computer Science or a related field, with a solid foundation in data structures, operating systems, networking, and concurrent programming.

• Strong proficiency in Java, with experience building large-scale backend systems.

• Deep understanding of backend architecture design, with hands-on experience delivering high-concurrency, high-availability, and scalable systems.

• Proficiency with common middleware and infrastructure, including MySQL / PostgreSQL, Redis, message queues, RPC frameworks, Docker, and Kubernetes.

• Familiarity with on-chain data structures and blockchain RPC interfaces.

• Strong understanding of the full lifecycle of on-chain transactions: construction, simulation, signing, broadcasting, and confirmation.

• In-depth knowledge of major DEX mechanisms, including but not limited to Uniswap V2 / V3 (AMM, CLMM, ticks, and liquidity distribution).

• Understanding of MEV risks, front-running, sandwich attacks, and common mitigation strategies.

Nice to Have

• Hands-on experience with DEX aggregators, wallets, exchanges, or DeFi protocol projects.

• Experience with non-EVM chains such as Solana, Sui, or Aptos is a strong plus.

• Familiarity with EIP-4337 (Account Abstraction wallets), Permit, Meta-Transactions, and other emerging transaction models.

• Proven experience in performance optimization, improving transaction success rates, or cost optimization.

• Experience with technical knowledge sharing, technical documentation, or open-source contributions.

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