Senior Full Stack Engineer
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.
CW
Profile
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.
Core Focus
- 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.
Strengths
Key Areas of Expertise
Social Content Generation & Virality
Social Content Generation & Virality
Create tools for short-form content (memes, clips, carousels) with GenAI and real-time APIs; automate publishing pipelines across TikTok, X (Twitter), Threads, and Instagram.
Link-in-Bio & Deep Linking
Link-in-Bio & Deep Linking
Develop branded link-in-bio tools with dynamic deep linking, mobile routing, UTM tracking, and QR flows to boost retention, engagement, and attribution.
2D/3D Visualization & Interactive UX
2D/3D Visualization & Interactive UX
Render high-performance visuals using Three.js, React Three Fiber, WebGL, Canvas API; experienced with point clouds, spatial data, and immersive analytics dashboards.
Performance & Frontend Optimization
Performance & Frontend Optimization
Optimize Lighthouse scores, Core Web Vitals, and rendering using lazy-loading, code-splitting, hydration, and tuning React/Next.js apps for scale.
Data Scraping & Normalization
Data Scraping & Normalization
Build web scrapers with Playwright, Puppeteer, or headless browsers; structure unstructured data for dashboards, analytics, and AI pipelines.
AI Agents & Automation
AI Agents & Automation
Design autonomous agents using LangChain, LlamaIndex, and OpenAI APIs for intelligent task routing, memory management, and workflow automation integrated into full-stack apps.
Product-Led Engineering & Rapid Prototyping
Product-Led Engineering & Rapid Prototyping
Own end-to-end delivery from idea and Figma to code; leverage Turborepo, tRPC, Prisma, Tailwind, and shadcn/ui for fast, iterative, business-focused shipping.
DevOps, CI/CD & Tooling
DevOps, CI/CD & Tooling
Implement CI/CD with GitHub Actions, Vercel, Docker, Railway; automate testing, previews, deployments, and environment config in modern monorepos and cloud platforms.
Startup & Domain Expertise
Startup & Domain Expertise
Led engineering initiatives in fintech, creator economy, music tech, and trading tools; excel in fast-paced, zero-to-one environments owning full delivery.
Domains
Industries Served
Real Estate
Property management platforms, listing portals, and virtual tour applications
Social Media
Content creation tools, community platforms, and engagement analytics
Video Content & Marketing
Streaming platforms, video editing tools, and marketing automation
Healthcare
Telehealth platforms, patient management systems, and medical analytics
Fitness & Sports
Workout tracking apps, sports analytics, and wellness platforms
SaaS
Enterprise software solutions, productivity tools, and business automation
FinTech
Trading platforms, payment systems, and financial analytics dashboards
E-commerce
Online marketplaces, inventory management, and customer experience optimization
Dating & Friendship
Matching algorithms, social discovery apps, and community building platforms
Travel & Hospitality
Booking platforms, travel planning tools, and hospitality management systems
Education
Learning management systems, online courses, and educational analytics
Work History
Experience
Senior Software Engineer · Cullen Watson LLC
Nov 2023 — Present
Dallas, TX
React.jsNext.jsTypeScriptTailwind CSSShadCNJotaiNode.jsPythonFastAPIDjangoWebRTCtRPCGraphQLVisxD3.jsPrismaPostgreSQLSupabaseDockerKubernetesTerraformAWSAzureCursorClaude Code
- Led the 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.
- Engineered the Node.js based backend to complement the frontend, building scalable APIs and real-time data pipelines—showcasing full-stack ownership and senior-level integration of blockchain analytics (Taostats).
- Engineered 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 (GPT-4/5.0) integrated with Python (FastAPI/Django) to automate patient interactions across voice, chat, SMS, and web for scheduling, prescription refills, and billing (Hyro.ai).
- Identified and resolved architectural bottlenecks in integration layers connecting to third-party APIs (CRMs, live chat, telephony, EMRs), and ensured low-latency performance under high concurrency (Hyro.ai).
- Integrated frontend applications seamlessly with backend services using GraphQL, tRPC (with Prisma), and Django REST framework APIs.
- Led code reviews and design discussions to mentor other engineers, driving adoption of automated testing frameworks and CI/CD pipelines to enforce clean, testable, and maintainable code.
- Utilized AI code editors (Cursor, Claude Code) and modern tooling to boost development velocity and efficiency.
Senior Software Engineer · AudienceLab
Jun 2024 — Apr 2026
Chesterfield, GB
React 18Next.jsTypeScriptTailwind CSSNode.jsPythonFastAPIBigQueryClickHouseSupabaseStripeAWSDockerKubernetes
- Owned end-to-end development of scalable microservices and RESTful APIs using Node.js and Express, deployed on AWS with Docker; improved system throughput by 30% via asynchronous, non-blocking I/O patterns, fault‑tolerant designs (retries with exponential backoff, idempotency keys, graceful degradation using circuit breakers).
- Built a full-stack analytics dashboard with React and TypeScript, serving near real‑time campaign insights to 500+ daily active users; reduced p95 query latency by 35% through BigQuery and ClickHouse optimizations across 100M+ records.
- Integrated Stripe and Supabase (PostgreSQL) for payment processing and real‑time data sync; architected third‑party API integrations with automatic retries, GraphQL federation for unified data fetching, and circuit breakers under fintech‑style reliability requirements.
- Led code reviews and mentored 3 junior engineers in Node.js (Express, TypeORM/Mongoose), GraphQL (schema design, resolver optimization, DataLoader for N+1 prevention), and TypeScript best practices, reducing bug recurrence by 25% and raising test coverage (Jest) to 85%.
- Deployed and managed containerized applications using Docker and Kubernetes on AWS; implemented CI/CD pipelines (GitHub Actions) and JWT‑based authentication with rate limiting (e.g., express-rate-limit, Redis store) for production microservices.
Full Stack Engineer · AssetWorks Inc
Jun 2023 — May 2024
Dallas, TX
ReactTypeScriptJavaScriptNode.jsExpress.jsGraphQLRESTful APIPostgreSQLAWSSupabaseDockerKubernetesTerraformCI/CD
- Developed and maintained full-stack web applications using Node.js (Express/NestJS), GraphQL and RESTful APIs, React with TypeScript, and PostgreSQL, following SDLC best practices (Git, code review, CI/CD).
- Reduced runtime UI errors by 40% by enforcing strict type checking in TypeScript and standardizing GraphQL schema definitions and REST API response contracts across frontend and backend.
- Operated independently in a small startup team (fewer than 5 engineers), making unilateral technical decisions on database schema, GraphQL/REST API contracts, and cloud infrastructure (AWS/GCP/Azure).
- Containerized microservices using Docker and deployed to AWS (EC2/EKS), implementing GitHub Actions pipelines for automated testing and rollout of Node.js services.
- Mentored 2 junior engineers through weekly code reviews, system design whiteboarding sessions, and incident post-mortems, directly improving team velocity by 20%.
Software Developer · Cvent
May 2019 — Jan 2023
Dallas, TX
ReactNext.jsTypeScriptJavaScriptNode.jsNest.jsPythonFastAPIDjangoPostgreSQLTailwind CSSD3.jsAWSDockerCI/CD
- Developed responsive and accessible user interfaces for multiple projects using React, Next.js, TypeScript, focusing on modern UI design principles (SickFade, SpeedApply).
- Engineered a high-performance Node.js backend for Sickfade, delivering sub-100ms response times at scale.
- Developed probability scoring APIs, real-time odds tracking, and live data pipelines, paired with production monitoring, error tracking, and admin dashboards to ensure reliability across the full stack.
- Python backend development (FastAPI, Django) for production systems with 40K+ weekly users.
- Developed scrapers with 8,000+ GitHub stars, demonstrating deep understanding of data extraction at scale.
- Leveraged PostgreSQL to architect robust, production-grade backend services, writing efficient SQL queries and managing relational database design to support automated testing and seamless API versioning on AWS.
- Deployed containerized applications with CI/CD, automated testing, and cloud infrastructure (AWS/GCP).
- Worked independently in small startup teams (2–5 engineers) making architectural decisions end-to-end.
- Experience with reliability-sensitive domains including real-time financial (odds) data and user authentication.
- Experienced with the full SDLC, Git-based collaboration, code review workflows, and Agile methodologies.
- Eligible for Public Trust clearance.
Achievement
The Proudest in My Career
AI Fluent Tech Professional
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.
Machine LearningStatistical ModelingAI Graduate StudiesRAGLLMAgentic AI
Featured Portfolio
Projects
Taostats 🥇🥇🥇
Data Analytics | Web3 | WebRTC
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.
Next.jsTypeScriptJotaiVisxD3.jsWebRTCMQTTGraphQLtRPCTailwind
AudienceLab 🥇🥇🥇
AI Content Platform
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
Next.jsTypeScriptTailwind CSSLLMsPythonSupabaseStripeGraphQL
SickFade 🥇🥇🥇
+EV Sports Picks
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
ReactNext.jsTypeScriptTailwind CSSShadCNNode.jsGraphQLPostgreSQLSupabaseAWSD3.js
SpeedyApply 🥇🥇🥇
Job Application Autofill Tool
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
ReactTypeScriptNode.jsPostgreSQLChrome Extension
Hyro.ai 🥇🥇🥇
Healthcare | AI
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
ReactNext.jsTypeScriptPythonDjangoRESTful APIPostgreSQLSupabaseAWSLLMHIPAA
Golden City 🥇🥇🥇
Real Estate | 3D Visualization | Web3
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).
Next.jsTypeScriptThree.jsWebXREthers.jsSolidityAWSLangChain
Liftango 🥇🥇🥇
Transport | Mobility | Mapping
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.
ReactReduxMaterial UIGoogle Maps API
Butterflies 🥇🥇🥇
AI + Human Social Network | Web | iOS
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.
ReactReact NativeTypeScriptViteTailwind CSSFramer MotionJotaiSupabaseVercelGCPMixpanel
Saivvi 🥇🥇🥇
Social Content Ideation | AI Generation | Mobile App
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.
ReactReact NativeSupabaseRevenueCatPush NotificationsSentryBugsnagOAuth
Tooling & Expertise
Skills
Next.jsReactTypeScriptJavaScriptTailwind CSSShadCNChakra UIMaterial UIReduxZustandJotaiGraphQLtRPCRESTPrismaPostgreSQLSupabaseNode.jsPython (Django)WebRTCMQTTSocket.ioD3.jsVisxJestRTLCypressStorybookViteAstroRSCSSRSEOWCAGGSAPFramer MotionShadersAI/LLMs (OpenAI)Luma AIAWS (EC2, Serverless)AzureVercelDockerKubernetesLLMAgentic AICursorClaude Code
Degrees
Education
Southern Methodist University
B.A. Computer Science | B.S. Statistical Science | B.B.A. Finance
Apr 2019 - May 2023
What People Say
Testimonials
"Cullen raises the bar for frontend quality—he ships performant, accessible interfaces and elevates the team’s engineering practices."
MG
Marcus Graichen
Founder @ Taostats
"He transformed our data-heavy UI with thoughtful architecture and smooth interactions. The GSAP polish impressed stakeholders."
MG
Marcus Graichen
Founder @ Taostats
"Reliable, detail-oriented, and a great collaborator. Cullen bridges design and engineering exceptionally well."
NV
Nenad Vucicevic
Project Manager @ Taostats
Philosophy
Philosophy
Software Engineering 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
Let’s Collaborate