Justin Duplain

About

I build AI-powered applications end to end, from agentic backend systems and RAG pipelines to the production UIs that make them usable. My recent work includes building agentic compliance automation for a B2B SaaS platform in a regulated industry, deploying a hybrid-search RAG pipeline on AWS, and shipping a real-time AI threat intelligence dashboard. I care about making AI useful, auditable, and fast.

My background is in frontend and full-stack engineering. I spent 3+ years shipping enterprise React/TypeScript UIs at Oracle, and I bring that same focus on performance, accessibility, and clean component architecture to AI-integrated applications. I’m comfortable across the stack: TypeScript, Python, FastAPI, LlamaIndex, Supabase, and modern deployment infrastructure.

I’m a former US Marine. I bring leadership, adaptability, and process discipline to every project, and I’m motivated by solving hard problems and delivering solutions that make a measurable impact.

I build AI systems that people can actually trust and use. Interested in agentic workflows, RAG, and making AI auditable in high-stakes domains.

Technical Skills

AI & ML: RAG pipelines, agentic workflows, LLM integration (OpenAI, Gemini), embeddings, vector search (ChromaDB), LlamaIndex, Vercel AI SDK, prompt engineering
Frontend: TypeScript, React 19, Svelte 5, Next.js, Vite, Tailwind CSS, USWDS, Storybook, TanStack, component architecture, state management
Backend & Data: Python, FastAPI, Node.js, PostgreSQL, Supabase (Edge Functions, Auth, Realtime, PGMQ), REST APIs, microservices
Cloud & DevOps: AWS EC2, nginx, Vercel, systemd, CI/CD, Git
Testing & Quality: Vitest, Jest, Vitest-Axe, WCAG/Section 508 accessibility, Lighthouse

Resume

Senior Software Engineer | U.S. Marine Corps Veteran

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Summary

User-centered Senior Frontend Engineer with 10+ years in web and 3+ years shipping enterprise React/TypeScript UIs, and U.S. Marine Corps veteran. Expertise in micro-frontends, design systems, and performance & accessibility. Strengths in API-driven integrations, accessibility & testing, and cloud/edge product delivery and excellent at collaborating with cross-functional global teams.

Professional Experience

Senior Software Engineer, Oracle Cloud Infrastructure (OCI)

09/2024 - Present

Oracle, Remote, FL

Oracle is a Fortune 100 global enterprise software and cloud leader. OCI is Oracle’s hyper-scale public cloud platform offering distributed compute, storage, networking, database, and AI services.

I led the migration of a 15+ screen management console to a config-based TypeScript framework, cutting integration effort by ~20% and standardizing feature gating across 20+ endpoints. I built shared React/TypeScript and Oracle JET components used in 12+ micro-frontends, enabling delivery of key features like Disaster Recovery and Replication while improving maintainability and accessibility. I also automated development setup with an AI-assisted script, saving the team significant daily time and boosting overall productivity.

Member of Techical Staff, Product Engineering (OCI)

08/2022 - 09/2024

Oracle, Remote, FL

Defined frontend architecture standards and built internal tooling that automated infra workflows, streamlined onboarding, and accelerated adoption of modern UI practices; partnered with design/QA to deliver WCAG-compliant improvements that enhanced usability across customer-facing apps.

Web & Digital Consultant

10/2021 - 06/2022

SCF Coding Academy, Bradenton, FL

Provided web design, development, and digital services to a local technology training organization. Created websites, landing pages, microsites, interactive custom forms, directly contributing to meeting inaugural enrollment goals for web development bootcamp, STEM youth camps, python training programs, and other classes.

Webmaster/Digital Marketing Manager

12/2019 - 10/2021

State College of Florida, Bradenton, FL

Led web management for the region's largest public College, serving 40,000+ students annually and 1,000+ employees. Transitioned to leading digital efforts to stand up a new $3.6m entrepreneurship center and coding academy. Managed the core SCF.edu website, intranet site, and existing subdomains for the College and deployed 5+ additional web domains and digital properties. Utilized HTML5, XHTML, CSS, JavaScript, WordPress, PHP, and Bootstrap to code, review, and publish thousands of pages for SCF.edu, coordinating with 100+ users across dozens of departments. Implemented digital platforms & SaaS tools to support business operations. Coordinated with IT and customers/clients to research and solve technical issues; provided web and technical guidance and training to customers, vendors, and peers.

Web Consultant & SCF Lab Instructor

07/2014 - 12/2019

Various

Developed and transitioned full-scale WordPress websites and CRM platforms for small and medium businesses and managed SCF Art & Design Department Mac computers across 4 buildings & 20+ labs and offices. Implemented and maintained client WordPress websites and CRM platforms, created associated SQL databases, integrated external databases, and automated backups. Managed client site deployments, hosting, DNS properties, SEO, and created custom themes.