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Hi, I’m David Roy—a Senior Software Engineer focused on building scalable, high-performance web and mobile applications for fintech, e-commerce, and healthcare. Over the past seven years I’ve delivered secure, API-driven solutions across front-end, back-end, and cloud layers, with a passion for clean code, performance, and delightful user experiences. When I’m not coding, I love collaborating with product, design, and data teams, mentoring juniors, and exploring AI integrations with LangChain, OpenAI, and vector databases to automate workflows and boost engagement. I’m energized by fast-paced environments and continuous delivery through CI/CD and modern devops practices.…Hi, I’m David Roy—a Senior Software Engineer focused on building scalable, high-performance web and mobile applications for fintech, e-commerce, and healthcare. Over the past seven years I’ve delivered secure, API-driven solutions across front-end, back-end, and cloud layers, with a passion for clean code, performance, and delightful user experiences. When I’m not coding, I love collaborating with product, design, and data teams, mentoring juniors, and exploring AI integrations with LangChain, OpenAI, and vector databases to automate workflows and boost engagement. I’m energized by fast-paced environments and continuous delivery through CI/CD and modern devops practices.

David Roy

Full Stack Developer, Web Developer, Front-End Developer, +2

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Hi, I’m David Roy—a Senior Software Engineer focused on building scalable, high-performance web and mobile applications for fintech, e-commerce, and healthcare. Over the past seven years I’ve delivered secure, API-driven solutions across front-end, back-end, and cloud layers, with a passion for clean code, performance, and delightful user experiences. When I’m not coding, I love collaborating with product, design, and data teams, mentoring juniors, and exploring AI integrations with LangChain, OpenAI, and vector databases to automate workflows and boost engagement. I’m energized by fast-paced environments and continuous delivery through CI/CD and modern devops practices.…Hi, I’m David Roy—a Senior Software Engineer focused on building scalable, high-performance web and mobile applications for fintech, e-commerce, and healthcare. Over the past seven years I’ve delivered secure, API-driven solutions across front-end, back-end, and cloud layers, with a passion for clean code, performance, and delightful user experiences. When I’m not coding, I love collaborating with product, design, and data teams, mentoring juniors, and exploring AI integrations with LangChain, OpenAI, and vector databases to automate workflows and boost engagement. I’m energized by fast-paced environments and continuous delivery through CI/CD and modern devops practices.

Available to hire

Hi, I’m David Roy—a Senior Software Engineer focused on building scalable, high-performance web and mobile applications for fintech, e-commerce, and healthcare. Over the past seven years I’ve delivered secure, API-driven solutions across front-end, back-end, and cloud layers, with a passion for clean code, performance, and delightful user experiences.

When I’m not coding, I love collaborating with product, design, and data teams, mentoring juniors, and exploring AI integrations with LangChain, OpenAI, and vector databases to automate workflows and boost engagement. I’m energized by fast-paced environments and continuous delivery through CI/CD and modern devops practices.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Senior Software Engineer (Hybrid) at FNBO

August 1, 2022 - October 1, 2025

Led development of responsive UIs for FNBO Online Banking using React, TypeScript, and Tailwind, achieving 98% cross-browser coverage. Built modular Next.js and Vue components for Bend by FNBO, integrating real-time account data and optimizing CDN caching for 25% faster load. Implemented React Native features for Slice POS including offline handling and push notifications, improving user retention by 18%. Enhanced dashboards with Bootstrap and Chart.js using reusable React hooks, improving rendering performance by 35%. Developed Node.js and Python microservices for transaction processing with JWT, OAuth2, and REST APIs, securing over 1M monthly transactions. Created backend services for Bend by FNBO CaaS APIs integrating Stripe and caching layers, reducing errors by 40% while handling 500+ requests. Designed database-driven workflows for Slice POS using PostgreSQL and Redis, achieving 99.9% reliability. Integrated LangChain, ChatGPT, and Pinecone for multi-turn AI chat interactions, in

Software Engineer (Hybrid) at ACI Worldwide

October 1, 2018 - June 1, 2022

Engineered responsive React and Next.js interfaces for a real-time payments platform, improving transaction visibility and reducing load time by 30%. Created reusable Vue components for an eCommerce payment gateway, improving user engagement and increasing conversion rates by 22%. Integrated Node.js and Python backend services with real-time fraud scoring APIs, reducing fraudulent transactions by 18%. Implemented mobile-first React Native dashboards for payment analytics, increasing mobile adoption by 25%. Optimized frontend performance by implementing server-side rendering in Next.js and lazy-loading modules, reducing page load time by 40%. Maintained cross-platform UI components and state management for complex payment flows, ensuring 100% feature parity across web and mobile. Participated in code reviews, unit testing, and CI/CD integration, improving code reliability and reducing bug reports by 30%.