Software Developer, Chainlink & Smart Contracts

Our client is a leader in the crypto and Web3 space, operating at the frontier of decentralized finance and blockchain infrastructure. The organization builds cutting-edge solutions for smart contract applications and is a key participant in the Chainlink ecosystem, helping shape the future of secure, trust-minimized decentralized systems that connect blockchains to real-world data and off-chain computation.

We are seeking a skilled Software Developer with deep hands-on experience in blockchain development, specifically with Chainlink’s suite of oracle and cross-chain infrastructure products and smart contract development. This role sits at the core of the client’s engineering team, designing and optimizing decentralized applications and oracle integrations that power some of the most consequential smart contract protocols in the space.

Core Chainlink Infrastructure You Will Work With

Chainlink is the industry-standard decentralized oracle network, enabling smart contracts to securely access off-chain data, computation, and cross-chain interoperability. This role requires deep familiarity with the full product surface. Below are the core Chainlink products directly relevant to this position:

• CCIP (Cross-Chain Interoperability Protocol)Secure cross-chain token transfers and arbitrary messaging with Risk Management Network defense.
• Data FeedsDecentralized aggregated price feeds powering DeFi protocols including Aave, Compound, and Synthetix.
• Data StreamsLow-latency pull-based market data for high-frequency derivatives and perps protocols.
• VRF (Verifiable Random Function)Cryptographically provable randomness for NFTs, gaming, and on-chain lotteries.
• Chainlink FunctionsServerless compute enabling smart contracts to fetch from any API and run custom off-chain logic.
• Automation (Keepers)Decentralized smart contract automation for conditional and time-based execution.

Primary Duties and Responsibilities

• Design and develop smart contracts for blockchain applications with a focus on Chainlink oracle integration, ensuring data security, tamper-resistance, and accuracy via decentralized aggregation
• Build and integrate decentralized applications (dApps) with Chainlink’s Data Feeds, Data Streams, VRF, Functions, Automation, and CCIP infrastructure
• Write, test, and deploy smart contracts on EVM-compatible chains including Ethereum mainnet, Avalanche, Arbitrum, Base, Optimism, and Polygon, as well as non-EVM environments
• Implement CCIP-based cross-chain messaging and token transfer flows, leveraging the Risk Management Network and programmable token mechanisms for secure interoperability
• Optimize the performance, gas efficiency, and scalability of decentralized applications, with deep attention to oracle integration patterns and on-chain computation costs
• Develop secure, auditable smart contract solutions for DeFi protocols, institutional tokenization, on-chain insurance, prediction markets, and data verification use cases
• Integrate Chainlink VRF v2.5 and VRF subscription management into gaming and NFT applications requiring cryptographically verifiable randomness
• Use Chainlink Functions to build hybrid smart contracts that consume REST APIs, compute off-chain logic, and return results on-chain within a decentralized compute environment
• Participate in code reviews with a focus on security, reentrancy protection, oracle manipulation resistance, and MEV mitigation
• Stay current with Chainlink protocol upgrades including CCIP v1.5, Staking v0.2, and the evolving Chainlink Economics 2.0 framework

Education, Experience, and Technical Skills

• Proficiency in Solidity and/or Rust for smart contract development on EVM and non-EVM chains
• Strong understanding of Chainlink oracle architecture including aggregation contracts, OCR (Off-Chain Reporting), and decentralized node operator networks
• Direct hands-on experience integrating Chainlink Data Feeds, VRF, Automation, or CCIP into production smart contracts
• Familiarity with Web3 development frameworks including Hardhat, Foundry, Truffle, and Web3.js or Ethers.js
• Solid understanding of dApp architecture, ERC token standards (ERC-20, ERC-721, ERC-1155, ERC-4626), and the EVM execution environment
• Experience with smart contract security practices including reentrancy guards, access control patterns, oracle manipulation mitigations, and formal audit preparation
• Strong analytical and problem-solving skills with attention to gas optimization and on-chain performance

Additional Preferred Background

• Experience building or contributing to DeFi protocols leveraging Chainlink Data Feeds for price-sensitive liquidation logic, collateral management, or yield strategies
• Familiarity with Chainlink Staking, node operator economics, and the LINK token’s role in cryptoeconomic security and service-level agreements (SLAs)
• Understanding of Layer 2 scaling solutions (Arbitrum, Optimism, Base, zkSync) and how Chainlink oracle feeds are deployed and consumed across L2 environments
• Knowledge of CCIP programmable token transfers, token pool configuration, and the Defense-in-Depth security model including the Active Risk Management Network
• Experience with zero-knowledge proof systems, cryptographic commitments, or threshold signature schemes relevant to Chainlink’s off-chain reporting model
• Familiarity with Chainlink BUILD and SCALE programs and the incentive structures for protocols integrating deeply with the Chainlink ecosystem
• Contributions to open-source smart contract libraries (OpenZeppelin, Chainlink contracts repo) or documented security audit findings

What the Client Offers

Need to Hire?

Excelon Associates recruits software engineers, smart contract developers, and blockchain infrastructure specialists for leading Web3 companies, DeFi protocols, and organizations building on the Chainlink ecosystem. We identify candidates who combine technical depth in decentralized systems with the collaborative skills to operate effectively in a fast-moving, high-stakes environment.

Excelon does not discriminate on the basis of race, religion, sex, gender, sexual orientation, national origin, marital or veteran status, disability, age, or any other characteristic protected by law.