Service-oriented architecture (SOA) is emerging in the blockchain ecosystem, particularly within decentralized finance (DeFi), by fostering modularity through the use of microservices, which accelerates innovation and development cycles. Chainlink co-founder Sergey Nazarov highlights how Chainlink's network supports this architecture by providing reliable microservices such as secure price feeds and verifiable randomness, which are crucial for smart contract applications. The shift from monolithic to service-oriented architectures in smart contracts allows for efficient and secure integration of various protocols, enabling rapid iteration and value sharing among DeFi applications like Aave and Synthetix. Chainlink's infrastructure facilitates this modular approach by offering decentralized microservices and ensuring data security, thus driving a positive feedback loop that enhances the utility and demand for blockchain-based services. This evolution mirrors past transitions in traditional computing and underpins the rapid growth of DeFi by allowing diverse services to combine and create advanced financial products.