Building performant, accessible, and scalable software that move business forward.
I have rich experience delivering industrial web applications across healthcare, fintech, blockchain, and Web3—all the way to production.
About
Hello! I'm Cullen, a Senior Full Stack Engineer with 7+ years of experience designing, building, and leading the delivery of sophisticated web applications across diverse environments, from backend systems, cloud infrastructure, and enterprise SaaS. Proven ability to architect performant, accessible, and scalable UIs usingReact,Next.js, andTypeScript, seamlessly integrating with various backends (Node.js,Python,Go) and cutting-edge technologies likeAI/LLMs,WebRTC, WebGL, and blockchain analytics. Extensive experience in3D visualization, having built immersive and interactive platforms with Three.js, BabylonJS, and custom GLSL shaders—optimizing asset pipelines, point cloud rendering, and photorealistic environments forReal Estate, Hospitality, and Web3 applications. Adept at translating complex requirements into user-centric solutions that drive engagement and business value.
- Full-stack development expertise with React, Next.js, TypeScript, Node.js, Python, and Go for scalable web applications.
- Real-time and data-intensive systems using WebRTC, MQTT, GraphQL, tRPC, and optimized PostgreSQL/Supabase.
- Cloud & DevOps proficiency on AWS and Azure with Docker, Kubernetes, and Terraform.
- AI/LLM integration skills for generative AI interfaces and conversational agents.
Key Areas of Expertise
Industries Served
Property management platforms, listing portals, and virtual tour applications
Content creation tools, community platforms, and engagement analytics
Streaming platforms, video editing tools, and marketing automation
Telehealth platforms, patient management systems, and medical analytics
Workout tracking apps, sports analytics, and wellness platforms
Enterprise software solutions, productivity tools, and business automation
Trading platforms, payment systems, and financial analytics dashboards
Online marketplaces, inventory management, and customer experience optimization
Matching algorithms, social discovery apps, and community building platforms
Booking platforms, travel planning tools, and hospitality management systems
Learning management systems, online courses, and educational analytics
Experience
- Designed a scalable frontend system for international e-commerce markets (MX, CA, CL), and contributed to platform migration, CMS tool development, and the establishment of deployment governance.
- Core contributor to Walmart Mexico Bodega One Hallway (BDOH) redesign, supporting phased rollout dashboards and a 100% customer ramp-up with zero downtime.
- Enabled ScrollableItemGrid product grids for MX/CA via Tempo/CLS config, bypassing code rewrites and accelerating time-to-market by 2 sprints.
- Supported frontend content delivery for 6+ international markets via GraphQL federation and the Glass platform, ensuring low-latency, i18n-optimized storefront experiences.
- Contributed to FE Validation Rotation for weekly international releases; introduced automated canary checks that cut post-release incidents by 45% and reduced validation time to 90 min.
- Acted as a primary bridge between US and International teams, resolving API, filtering, and resource blockers via weekly triage, cutting dependency wait times by 50%.
- Utilized Claude Code and modern tooling to boost development velocity and efficiency.
- Took AudienceLab.io from beta to stable production, serving 15K+ creators at 99.9% uptime and reaching $1M MRR.
- Developed React and TypeScript dashboard for 15K+ users, cutting p95 latency 35% on 100M+ BigQuery/ClickHouse records.
- Designed and deployed HIPAA-compliant, LLM-powered conversational AI agents using OpenAI APIs integrated with Python (FastAPI/Django).
- Built Node.js and Express microservices on AWS, boosting throughput 30% via async I/O and fault-tolerant patterns.
- Through Node.js-powered asset inspection, 10M inspections/day, sub-200ms p99, and a fleet rewrite, cut API latency by 40%
- Integrated Stripe, Supabase (PostgreSQL), and GraphQL federation with retries and circuit breakers for reliability.
- Resolved architectural bottlenecks in third-party API integrations (CMS, CRMs, Telephony, EMRs) for low-latency performance under high concurrency.
- Drove adoption of automated testing frameworks and CI/CD pipelines to enforce clean, testable, and maintainable code.
- Deployed and managed production platforms on AWS with Docker, Kubernetes, and Terraform.
- Leveraged Claude Code and Github Copilot to accelerate development speed while maintaining quality.
- Achieved zero critical downtime across 12+ microservices using Node.js and React (TypeScript). Delivered 30+ features under SDLC best practices.
- Developed Node.js microservices deployed on Google Cloud Run to process real-time pixel events, designed REST APIs and database schemas (BigQuery/Postgres) for high-throughput ingestion.
- Built resilient event processing with background workers, idempotent message handling, and Redis-backed caches to ensure fault tolerance and eventual consistency.
- Instrumented services with logging and metrics (Grafana) and enhanced CI/CD pipelines to automate deployments and simplify rollback during incidents.
- Achieved a 99.9% deployment success rate using Docker, AWS EKS, and GitHub Actions CI/CD, reducing rollout time by 60%.
- Contributed to end-to-end full-stack development and architecture for key client platforms, including Taostats (Bittensor blockchain explorer/analytics) and Hyro.ai (AI agents for healthcare).
- Architected scalable and performant frontends using React, Next.js, and TypeScript, optimizing for SEO (Taostats) and efficient handling of large datasets.
- Developed the Node.js based backend to complement the frontend, building scalable APIs and real-time data pipelines (Taostats).
- Implemented engaging user interactions, incorporating real-time data updates via WebRTC/MQTT, Zustand state, and overhauled complex data visualizations by migrating D3.js charts to Airbnb's Visx library (Taostats).
- Designed and deployed HIPAA-compliant, LLM-powered conversational AI agents using OpenAI APIs integrated with Python (FastAPI/Django) to automate patient interactions across voice, chat, SMS, and web for scheduling, prescription refills, and billing (Hyro.ai).
- Deployed containerized apps via CI/CD, wrote automated tests, and managed AWS infra with IaC (Terraform/CDK).
- Followed Agile, participated in code reviews, and collaborated via Git in a team-based SDLC environment.
The Proudest in My Career
Backed by graduate study in Artificial Intelligence and practical experience in machine learning and large-scale data processing, with a target focus on LLM, RAG, and agentic AI systems.
Projects
Block Explorer and Analytics Platform for the Bittensor network providing insights, metrics, and real-time data.
- Architected Next.js + TypeScript app for SEO and performance.
- Real-time feeds via WebRTC/MQTT; overhauled charts with Visx.
- Efficient state with Jotai; integrated GraphQL/tRPC APIs.
AudienceLab Empowers Advertisers To Target Any Audience On Any Platform.
- Built full-stack auth-to-billing loop: Next.js + Supabase Auth → Stripe subscriptions → AI generation credits → feature gating.
- Fixed race conditions in credit deduction logic, Stabilized Supabase Row Level Security (RLS) policies
- Achieved 99.9% uptime after production launch, supporting active creators at scale
Perfect for your NFL/MLB betting platform
- Built and maintained a live sports data platform featuring real-time data pipelines, probability scoring APIs, and interactive statistical visualizations.
- Added admin dashboards, error tracking, and production monitoring to ensure system reliability.
- Shipped features including player comparison tools, matchup analytics, and real‑time odds tracking
Optimize job search by automatically filling out and tracking job applications with our free extension.
- Built Python backend that consumed third-party REST APIs, including full JWT authentication flows.
- Implemented webhook triggers to enable real-time data synchronization.
- Transformed messy API payloads into clean, efficient data pipelines.
- Developed scrapers that gained 8,000+ GitHub stars
HIPAA-compliant conversational AI for healthcare
- Delivered HIPAA-compliant conversational AI for healthcare, automating patient interactions via voice, chat, SMS, web, and apps for scheduling, refills, and billing
Decentralized 3D property investment: immersive tours, NFT-based ownership, and AI-powered search.
- Built Next.js + TypeScript frontend with 3D tours in Three.js/WebXR.
- Integrated Web3 (Ethers.js/Web3.js) for wallet connect & smart contract ops.
- Delivered NFT portfolio dashboards, API integrations, and AI search (LangChain).
Sustainable shared transport platform: public transit, corporate carpooling, and autonomous vehicle solutions.
- Built React apps with Material UI and Redux for multi-modal transport management.
- Integrated Google Maps API for real-time routing, vehicle tracking, and geospatial analytics.
- Delivered features for public, corporate, and community transport, including demand-responsive routing.
AI + human social network: customizable AI companions, photo sharing, and real-world AR pics.
- Built React/React Native app with TypeScript, Vite, and Tailwind for fast, engaging UI.
- Implemented AI personality customization, photo sharing, and AR-style “take pics together” features.
- Integrated Supabase, Mixpanel, and GCP for backend, analytics, and scalable deployment.
AI-powered content ideation: creator personas, viral trend scanning, and strategic insights.
- Built cross-platform app with React/React Native, Supabase, and RevenueCat for subscriptions.
- Implemented TrendScan™ to surface niche-relevant keywords & topics from Google, TikTok, IG.
- Integrated push notifications, error tracking (Sentry/Bugsnag), and Google/Apple sign-in.
Skills
Education
Testimonials
Philosophy
I believe software engineering is more than writing code—it's about bringing ideas to life in a way that feels effortless to the user. My approach blends technical excellence with a deep understanding of user behavior, ensuring every interaction is fast, accessible, and intuitive. From crafting pixel-perfect interfaces to optimizing performance under the hood, I aim to bridge design and technology to create experiences that delight, engage, and empower.
- User-Centered Mindset
- Critical Thinking
- Think Outside the Box
- Attention to Detail
- Problem Solving
- Continuous Learning
- Cross-Functional Collaboration
- Clear Communication
- Adaptability & Flexibility
- Performance Optimization Focus
- Empathy in Design
- Code Quality Commitment
- Creative Problem-Solving
- Proactive Ownership
