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Hi, I'm Kealan Leslie Gifford, a Senior Full Stack Engineer with extensive experience in building scalable web applications using React, Angular, Node.js, Python, and blockchain technologies. I enjoy collaborating with cross-functional teams to drive technical excellence and deliver robust solutions that meet dynamic business needs. I am passionate about leveraging the latest frontend and backend technologies to create responsive, accessible user interfaces alongside efficient, modular backend services. Over the years, I've also developed expertise in blockchain development, smart contract engineering, and decentralized application modules, enabling secure and innovative digital asset management and DeFi protocol implementations.…Hi, I'm Kealan Leslie Gifford, a Senior Full Stack Engineer with extensive experience in building scalable web applications using React, Angular, Node.js, Python, and blockchain technologies. I enjoy collaborating with cross-functional teams to drive technical excellence and deliver robust solutions that meet dynamic business needs. I am passionate about leveraging the latest frontend and backend technologies to create responsive, accessible user interfaces alongside efficient, modular backend services. Over the years, I've also developed expertise in blockchain development, smart contract engineering, and decentralized application modules, enabling secure and innovative digital asset management and DeFi protocol implementations.

Kealan Leslie Gifford

Full Stack Developer, DevOps Developer, Blockchain Developer, +2

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Hi, I'm Kealan Leslie Gifford, a Senior Full Stack Engineer with extensive experience in building scalable web applications using React, Angular, Node.js, Python, and blockchain technologies. I enjoy collaborating with cross-functional teams to drive technical excellence and deliver robust solutions that meet dynamic business needs. I am passionate about leveraging the latest frontend and backend technologies to create responsive, accessible user interfaces alongside efficient, modular backend services. Over the years, I've also developed expertise in blockchain development, smart contract engineering, and decentralized application modules, enabling secure and innovative digital asset management and DeFi protocol implementations.…Hi, I'm Kealan Leslie Gifford, a Senior Full Stack Engineer with extensive experience in building scalable web applications using React, Angular, Node.js, Python, and blockchain technologies. I enjoy collaborating with cross-functional teams to drive technical excellence and deliver robust solutions that meet dynamic business needs. I am passionate about leveraging the latest frontend and backend technologies to create responsive, accessible user interfaces alongside efficient, modular backend services. Over the years, I've also developed expertise in blockchain development, smart contract engineering, and decentralized application modules, enabling secure and innovative digital asset management and DeFi protocol implementations.

Available to hire

Hi, I’m Kealan Leslie Gifford, a Senior Full Stack Engineer with extensive experience in building scalable web applications using React, Angular, Node.js, Python, and blockchain technologies. I enjoy collaborating with cross-functional teams to drive technical excellence and deliver robust solutions that meet dynamic business needs.

I am passionate about leveraging the latest frontend and backend technologies to create responsive, accessible user interfaces alongside efficient, modular backend services. Over the years, I’ve also developed expertise in blockchain development, smart contract engineering, and decentralized application modules, enabling secure and innovative digital asset management and DeFi protocol implementations.

Skills

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Expert

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Language

English

Fluent

Work Experience

Senior Full Stack Engineer at Samsara

December 31, 2024 - July 11, 2025

Developed and maintained enterprise-grade web applications using React, Redux, and Next.js for interactive dashboards. Built robust backend services with Python (Django REST Framework), implemented RESTful APIs, and designed microservices using Node.js (Express, NestJS) focusing on scalability and modularity. Engineered and deployed blockchain smart contracts with Solidity supporting ERC20 and ERC721 standards. Developed decentralized application modules enabling wallet connectivity and on-chain data retrieval. Utilized MongoDB, PostgreSQL, Redis, and implemented caching for performance. Employed Bootstrap, Tailwind CSS, and Styled Components for responsive UIs. Automated testing with Jest, Cypress, and Mocha. Managed deployments on AWS and Azure with Docker and Kubernetes. Handled CI/CD pipelines, authentication, and authorization integrating OAuth and SAML.

Full Stack Engineer at Visua

February 1, 2020 - July 11, 2025

Built high-performance backend systems using Node.js (Express, NestJS) and Python (Flask), focusing on modular design and efficient data processing for financial and blockchain applications. Developed frontend features with Angular and NgRx. Created RESTful APIs with Python (FastAPI) and designed GraphQL endpoints using Apollo. Developed and audited smart contracts in Solidity and Rust for ERC1155 token standards. Integrated decentralized and centralized exchange functionalities, handled wallet connectivity, and transaction signing. Managed MySQL and MongoDB databases with optimization strategies. Utilized Styled Components and Sass for maintainable UI. Deployed microservices to Google Cloud Run and Kubernetes. Automated testing with Playwright and Jasmine. Managed code repositories with GitLab and Bitbucket and automated infrastructure provisioning. Developed CLI tools in Bash and Shell Scripting for routine tasks.

Full Stack Engineer at Divvy

March 1, 2018 - July 11, 2025

Built and maintained backend services using Python (Django) and Node.js (Express), focusing on high-availability and fault tolerance. Developed frontend interfaces with React and Redux, integrating real-time RESTful APIs. Implemented backend APIs with Python (FastAPI) for data ingestion and reporting. Managed PostgreSQL and MySQL schemas for complex queries. Applied Bootstrap and Less for responsive UI design. Automated testing with Mocha and Jest. Deployed applications to Azure and Firebase using serverless architectures. Managed version control workflows, integrated RabbitMQ and Apache Kafka for event-driven microservice communication. Developed shell scripts for backup and deployment automation. Implemented enterprise SSO with SAML and actively participated in Agile Scrum ceremonies. Maintained documentation in Confluence and CMS and collaborated effectively with cross-functional teams.

Frontend Engineer at Yalantis

May 31, 2016 - July 11, 2025

Developed responsive web applications using AngularJS and Bootstrap to enhance user experience across devices. Implemented dynamic single-page applications using React and Redux for better performance and state management. Created reusable UI components with jQuery and Handlebars.js. Enhanced website performance by optimizing CSS and JavaScript, leveraging build tools such as Gulp and Webpack.

Senior Full Stack Engineer at Samsara

December 31, 2024 - July 11, 2025

Developed and maintained enterprise-grade web applications using React, Redux, and Next.js on the frontend and Python (Django REST Framework) on the backend. Engineered microservices using Node.js frameworks (Express, NestJS). Integrated Angular components for admin interfaces and implemented blockchain solutions including Solidity smart contracts, dApps with Web3.js and Ether.js, and DeFi protocols for staking and liquidity management. Utilized MongoDB, PostgreSQL, Redis for data and caching, applied Bootstrap, Tailwind CSS, and Styled Components for UI. Automated testing with Jest, Cypress, and Mocha, deployed on AWS and Azure using Docker and Kubernetes with CI/CD pipelines on Azure DevOps and GitHub Actions. Implemented secure authentication integrations using OAuth and SAML.

Full Stack Engineer at Visua

February 1, 2020 - July 11, 2025

Built backend systems using Node.js (Express, NestJS) and Python (Flask), developed Angular frontend features with NgRx for state management. Created RESTful APIs with Python (FastAPI) and GraphQL endpoints via Apollo GraphQL. Developed and audited smart contracts in Solidity and Rust supporting ERC1155 token standards, integrated DEX and CEX functionalities, wallet connectivity with Web3.js. Managed MySQL and MongoDB databases. Styled UI components with Styled Components and Sass. Deployed microservices to Google Cloud Run and Kubernetes clusters with Pub/Sub and BigQuery analytics. Implemented end-to-end testing with Playwright and Jasmine. Managed source control with GitLab and Bitbucket, automated deployments with Docker Compose and Kubernetes manifests. Developed custom CLI tooling for maintenance automation.

Full Stack Engineer at Divvy

March 1, 2018 - July 11, 2025

Built and maintained backend services with Python (Django) and Node.js (Express) focusing on high-availability. Developed React frontend with Redux state management integrating with RESTful APIs. Handled backend APIs with Python (FastAPI) for data ingestion and reporting. Designed database schemas for PostgreSQL and MySQL. Utilized Bootstrap and Less for responsive UI. Automated testing using Mocha and Jest. Deployed applications on Azure and Firebase, managed version control with GitHub and Azure DevOps. Implemented event-driven architecture with RabbitMQ and Apache Kafka. Developed shell scripts for automation and implemented SAML authentication for enterprise SSO integration. Actively participated in Agile Scrum ceremonies.

Frontend Engineer at Yalantis

May 31, 2016 - July 11, 2025

Developed responsive web applications using AngularJS and Bootstrap. Implemented dynamic SPAs with React and Redux. Created reusable UI components with jQuery and Handlebars.js and improved website performance by optimizing CSS and JavaScript using Gulp and Webpack.