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Hi, I’m Kevin Douglas Delong, a Senior Software Engineer with 10+ years building enterprise-scale platforms using React and Node.js across fintech, payments, e-commerce, and travel. I enjoy turning complex business logic into reliable, high-performance systems that scale with demand. I design scalable backend services, optimize frontend performance, and develop secure APIs for payment processing, booking, and commerce. I thrive in cloud environments, mentor teammates, and drive end-to-end product development in mission-critical environments.…Hi, I’m Kevin Douglas Delong, a Senior Software Engineer with 10+ years building enterprise-scale platforms using React and Node.js across fintech, payments, e-commerce, and travel. I enjoy turning complex business logic into reliable, high-performance systems that scale with demand. I design scalable backend services, optimize frontend performance, and develop secure APIs for payment processing, booking, and commerce. I thrive in cloud environments, mentor teammates, and drive end-to-end product development in mission-critical environments.

Kevin Douglas Delong

Full Stack Developer, Web Developer, Front-End Developer, +3

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Hi, I’m Kevin Douglas Delong, a Senior Software Engineer with 10+ years building enterprise-scale platforms using React and Node.js across fintech, payments, e-commerce, and travel. I enjoy turning complex business logic into reliable, high-performance systems that scale with demand. I design scalable backend services, optimize frontend performance, and develop secure APIs for payment processing, booking, and commerce. I thrive in cloud environments, mentor teammates, and drive end-to-end product development in mission-critical environments.…Hi, I’m Kevin Douglas Delong, a Senior Software Engineer with 10+ years building enterprise-scale platforms using React and Node.js across fintech, payments, e-commerce, and travel. I enjoy turning complex business logic into reliable, high-performance systems that scale with demand. I design scalable backend services, optimize frontend performance, and develop secure APIs for payment processing, booking, and commerce. I thrive in cloud environments, mentor teammates, and drive end-to-end product development in mission-critical environments.

Available to hire

Hi, I’m Kevin Douglas Delong, a Senior Software Engineer with 10+ years building enterprise-scale platforms using React and Node.js across fintech, payments, e-commerce, and travel. I enjoy turning complex business logic into reliable, high-performance systems that scale with demand.

I design scalable backend services, optimize frontend performance, and develop secure APIs for payment processing, booking, and commerce. I thrive in cloud environments, mentor teammates, and drive end-to-end product development in mission-critical environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at PrimeCode

February 1, 2020 - December 1, 2025

Led a cross-functional team of 4 to develop enterprise-grade retail, fintech, and healthcare platforms using React, Vue, Node.js, TypeScript, Next.js, Redux, and WebSockets. Oversaw architecture, task allocation, and stakeholder collaboration to deliver scalable, high-performance solutions. Implemented frontend and backend features end-to-end, integrated Affirm financing and secure payments, and optimized infrastructure with AWS, Nginx, and Cloudflare. Established analytics with GA4, Hotjar, and Sentry; implemented security measures (reCAPTCHA, Google Sign-In) to protect data and improve conversion. Collaborated with product managers, designers, and backend engineers to iterate on features aligned with business goals.

Software Engineer at Stardock

January 1, 2018 - February 1, 2020

Contributed to high-availability, transaction-driven systems for secure payment processing and financial data management. Built customer portals and data visualizations using React and Node.js; designed APIs with Express.js and MongoDB; improved performance via code-splitting, lazy loading, and efficient rendering; optimized MongoDB indexing and queries. Participated in code reviews and cross-functional collaboration. Project PayNearMe involved interactive data visualizations for accounts, payments, and transactions, along with real-time monitoring and secure API integrations.

Full Stack Developer at Nextient

January 1, 2015 - January 1, 2018

Developed scalable full-stack web apps using React, JavaScript (ES6+), Node.js, Express.js, Python, and MongoDB. Implemented RESTful APIs, authentication workflows, and RBAC to ensure secure, reliable communication between frontend and backend. Built reusable UI components with React Hooks; collaborated with designers and product teams to translate requirements into maintainable interfaces. Optimized performance through database indexing, code-splitting, and lazy loading; deployed on AWS and Docker.

Senior Software Engineer at PrimeCodo

February 1, 2020 - February 1, 2026

Architected and delivered enterprise-scale e-commerce and marketplace platforms, owning full-stack system design across React frontend, Node.js backend services, and AWS cloud infrastructure. Led the Benzeen Auto Parts platform with scalable product discovery, checkout, financing integrations, and secure transaction workflows handling complex business logic. Engineered RESTful APIs for authentication, payment processing, and third-party integrations; built performant, responsive UI with React and Next.js; implemented secure payment workflows. Implemented AWS-based cloud architecture with Nginx and Cloudflare to improve reliability and global asset delivery. Contributed to Hipcamp’s high-traffic booking system and integrated Python-based AI services for intelligent search and workflow automation.

Full Stack Developer at Nexient

January 1, 2015 - January 1, 2018

Developed scalable full-stack web applications using React, JavaScript (ES6+), Node.js, Express.js, and MongoDB. Built RESTful APIs, authentication, and RBAC; designed reusable UI components with React Hooks; improved performance via indexing, code-splitting, and lazy loading. Supported deployment and infrastructure workflows using AWS and Docker.