Adebayo Omolumo
Software Engineer
Cloud | DevOps | Web(3)
  • Location:
  • Type:
  • Period:
    May 2023 - August 2023
  • CI/CD
  • DevOps
  • Solidity
  • Cypress
  • Web3
  • Testing
  • AWS CloudFormation
  • AWS CloudFront
  • JavaScript
  • Security
  • Agile

Chainlink Hackathon: Online Safety

DevOps, Web3

Project details

Project Description:

At the heart of this project was the need to streamline our deployment processes and ensure efficient frontend and backend builds and tests for our Chainlink project. We aimed to integrate CircleCI into our workflow to automate tasks, enhance deployment reliability, and facilitate continuous integration and continuous deployment (CI/CD). This project had a significant impact on our project's efficiency and reliability.

Problem Statement:

Our previous deployment process was time-consuming, error-prone, and lacked a robust rollback mechanism. We needed a solution to deploy our infrastructure, both frontend and backend, efficiently and ensure that we could roll back in case of deployment failures. Additionally, automating testing and ensuring reliable artifact management were challenges we needed to address.

Solution and Implementation:

  • Infrastructure Deployment:
    We defined the "deploy-infrastructure" job, which utilized AWS CloudFormation templates to deploy our required infrastructure. This ensured consistent and reproducible deployments.
  • Rollback on Failure:
    The "destroy-environment" job was implemented to handle rollbacks by tearing down cloud resources if any deployment stage failed. This ensured that we maintain a clean environment in case of errors.
  • Frontend and Backend Build and Test:
    Our frontend, built on React.js and Next.js, and backend, powered by Solidity and Hardhat for smart contracts, underwent thorough building and testing using tools like Cypress for frontend testing.
  • Continuous Deployment:
    Applying CI/CD principles, we automated the entire process. CircleCI triggered builds on code commits, ensuring the latest changes were built, tested, and deployed to the designated environment.
  • Feedback and Smoke Testing:
    To receive quick feedback, the "acceptance-test" job was introduced. It performed a smoke test on the frontend site's title, confirming its basic functionality.
  • Artifact Management:
    The "persist_to_workspace" step preserved critical artifacts, such as "," for future steps, enhancing consistency across different stages.
  • Cloudfront Distribution:
    The "deploy-frontend" job deployed frontend assets to an AWS CloudFront distribution, improving content delivery efficiency.
  • Resource Cleanup:
    The "destroy-environment" job ensured resource cleanup, preventing resource clutter and saving costs in case of failures.

Outcome of the Project:

The implementation of CircleCI and associated practices had a substantial positive impact on our project:
  • Deployment time significantly reduced due to automation.
  • Deployment failures were handled seamlessly with reliable rollbacks.
  • Reliable testing ensured higher code quality and fewer bugs in production.
  • Continuous deployment reduced manual intervention, promoting faster releases.
  • Quick feedback through smoke testing ensured prompt error detection.
  • Improved artifact management facilitated smoother transitions between stages.
  • Efficient cleanup prevented unnecessary resource wastage.

Technologies Used:

  • Frameworks: React.js, Next.js
  • Styling: Tailwind CSS
  • Testing: Cypress
  • Smart Contracts: Solidity, Hardhat
Deployment and CI/CD:
  • CircleCI for automation
  • AWS for infrastructure deployment
  • Vercel for frontend deployment


This project showcased our commitment to optimizing our development and deployment practices, resulting in a more streamlined, reliable, and efficient Chainlink project.


This project aimed to enhance the deployment processes, efficiency, and reliability of a Chainlink project by integrating CircleCI for automation, implementing CI/CD practices, and addressing deployment challenges. It significantly reduced deployment time, improved reliability, and facilitated faster releases through automated testing, artifact management, and resource cleanup


React.js and Next.js were used to build the frontend of the Chainlink project. React.js is a popular JavaScript library for building user interfaces, while Next.js is a framework that simplifies React.js applications, providing features like server-side rendering.
Solidity is a programming language used for writing smart contracts on the Ethereum blockchain. Hardhat is a development environment for Ethereum that simplifies smart contract development, testing, and deployment.
Cypress was utilized for frontend testing. It is an end-to-end testing framework that helps ensure the quality and reliability of web applications by simulating user interactions and testing user flows.
CircleCI played a central role in automating deployment processes and implementing CI/CD practices. It triggered builds on code commits, automated testing, and ensured the continuous deployment of the latest changes.
AWS CloudFormation templates were used to deploy the required infrastructure. This allowed for consistent and reproducible deployments, ensuring that the infrastructure was set up as needed for the project.
AWS CloudFront was used to improve content delivery efficiency by deploying frontend assets to a content delivery network (CDN). This resulted in faster content delivery to end-users.
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© 2023 Adebayo Omolumo

Adebayo Omolumo