Senior AI &
Full-Stack Engineer|
I build scalable web platforms, distributed systems, and AI-powered products — from end-to-end ML pipelines to production-grade full-stack apps.
David Wang
Senior AI Full-Stack Engineer
Trusted across enterprise, SaaS & AI-driven teams
Engineering at the intersection of AI and the web
Senior AI Full-Stack Engineer with 10+ years of experience building scalable web applications, distributed systems, and AI-powered platforms. I pair deep full-stack engineering (JavaScript, TypeScript, Python, React, Node.js) with hands-on work in LLMs, model evaluation, RLHF, and AI-assisted development to ship high-performance products across SaaS, enterprise, and AI-driven domains.
AI / LLM Engineering
LLM evaluation, RLHF, prompt design, RAG, and agentic systems — building and improving the models, not just calling them.
Full-Stack Delivery
React, Next.js, Node.js, Python — end-to-end product engineering from polished UI to resilient backend services.
Scalable Architecture
Microservices, event-driven systems, and distributed processing designed for performance and reliability at scale.
What I can do for you
From AI-powered features to complete web platforms — full coverage across the stack, with the depth to own each layer end to end.
AI & LLM Engineering
Evaluate, fine-tune, and ship LLM-powered features into production — not just API calls.
- LLM evaluation & RLHF workflows
- RAG pipelines & vector search
- AI agents & workflow automation
- Prompt engineering & guardrails
Full-Stack Web Apps
End-to-end products, from database schema to polished UI, built to scale.
- SaaS platforms & admin dashboards
- REST & GraphQL API design
- Auth with JWT, OAuth2 & RBAC
- Real-time features & websockets
Frontend Engineering
Pixel-perfect, performant, accessible interfaces with delightful motion.
- React & Vue applications
- Responsive design systems
- Performance & Core Web Vitals
- Animations & micro-interactions
Backend & Architecture
Scalable, observable, event-driven systems that stay reliable under load.
- Microservices & event-driven design
- Queues: Kafka, RabbitMQ, BullMQ
- Caching & query optimization
- CI/CD, Docker & cloud on AWS
A full-stack + AI toolkit
Production experience across the entire stack — from model training and evaluation to frontend polish and cloud infrastructure.
AI-first engineer
I don't just call models — I evaluate, fine-tune, and ship them inside production-grade systems.
AI & Machine Learning
- Large Language Models (LLMs)
- Prompt Engineering
- AI Model Evaluation
- RLHF
- Human-in-the-Loop Training
- ML Pipelines
- OpenAI APIs
- Claude APIs
- AI Agent Systems
- RAG
- Vector Databases
- LangChain
- LlamaIndex
Frontend
- React.js
- Next.js
- Vue.js
- TypeScript
- JavaScript (ES6+)
- Tailwind CSS
- Redux
- HTML5 / CSS3
- Responsive Design
Backend
- Node.js (Express, NestJS)
- Python (Django, FastAPI)
- PHP (Laravel)
- REST API Design
- GraphQL
- WebSockets
- Real-Time Processing
Databases & Storage
- PostgreSQL
- MySQL
- MongoDB
- Redis
- Query Optimization
- Database Design
DevOps & Cloud
- AWS (EC2, S3, RDS, Lambda)
- Docker
- CI/CD (GitHub Actions, GitLab)
- Nginx
- Load Balancing
- Auto Scaling
- Linux Administration
Architecture & Systems
- Microservices
- Event-Driven Systems
- RabbitMQ / Kafka / BullMQ
- Distributed Systems
- API Gateway Design
- Prometheus / Grafana
10+ years building & shipping
From junior backend developer to senior AI engineer — a track record across enterprise, SaaS, and AI-driven products.
Senior AI Trainer · Revelo
Jan 2026 — May 2026- Evaluated and improved LLM outputs across software engineering, code generation, and technical reasoning tasks.
- Reviewed AI-generated code for correctness, performance, and maintainability against engineering best practices.
- Designed high-quality prompts and training scenarios to improve model reasoning and instruction-following.
- Performed annotation, ranking, and comparative analysis of model responses to support RLHF initiatives.
- Consistently ranked among top-performing contributors for evaluation accuracy and technical feedback.
Senior AI Engineer · ValueLabs
Sep 2023 — Dec 2025- Designed and maintained end-to-end ML pipelines in Python — from data collection to training, evaluation, and production release.
- Performed root-cause analysis on datasets, source code, and model behavior to enhance reliability and performance.
- Converted legacy ML scripts into modular, testable Python packages, improving stability and onboarding speed.
- Built internal tools for model evaluation, experiment tracking, and automated testing to ensure reproducibility.
- Translated unclear business requirements into well-defined, scalable ML implementations with cross-functional teams.
Full Stack Engineer · Scalable Path
Mar 2021 — Sep 2023- Migrated legacy monoliths into modular, scalable microservices — improving deployment speed and reliability.
- Built responsive React.js frontends and backend APIs powering web platforms, dashboards, and automation systems.
- Integrated AI/ML-driven functionality through backend services and data pipelines.
- Implemented secure auth with JWT, OAuth2, and RBAC; optimized performance via caching and async processing.
- Enhanced CI/CD pipelines and containerized environments for faster, more reliable deployments.
Full Stack / Backend Developer · 10Pearls
Mar 2018 — Mar 2021- Built scalable full-stack features for enterprise apps using Laravel, Django, and JavaScript frameworks.
- Designed relational schemas and optimized complex queries, reducing response times from seconds to milliseconds.
- Implemented background workers, cron jobs, and queue-based systems for asynchronous processing.
- Improved reliability through structured logging, monitoring, and robust error handling.
Junior Backend Developer · DataArt
Sep 2016 — Mar 2018- Developed backend services and APIs using PHP and Python.
- Built CRUD operations, authentication flows, and data-processing features.
- Designed and optimized SQL queries and database schemas.
- Maintained Linux environments and assisted in debugging production issues.
Things I've built
15 production websites and platforms across full-stack, React, and Vue — for clients spanning e-commerce, fintech, real estate, education, and lifestyle.
Full StackDecathlon
One-stop online store for sports goods in India. Built dynamic, responsive interfaces with React/Next.js and scalable Node.js/Express backend services as full-stack developer.
- React
- Next.js
- Node.js
- Express
- Bootstrap
Full StackFunding Circle
The UK's leading small-business loan platform (loans up to £500k). Built responsive React/Redux interfaces over ASP.NET services with multiple third-party API integrations.
- React
- Redux
- ASP.NET
- Bootstrap
Full StackHipcooks
Cooking-class platform with 50+ classes and online booking. Built an interactive Vue.js + Tailwind frontend and a Python/Flask backend handling scheduling, registration, and payments.
- Vue.js
- Tailwind CSS
- Python
- Flask
ReactMeTime
Marketplace connecting users with aesthetic medical professionals. Built a responsive, polished interface with React, Next.js, Tailwind, and TypeScript.
- React
- Next.js
- Tailwind CSS
- TypeScript
ReactRoomster
Popular co-living & roommate-finder platform with thousands of US listings. Enhanced search and UX with React, Redux, TypeScript, and Bootstrap.
- React
- Redux
- TypeScript
- Bootstrap
ReactLogitell
Publishing house & learning platform reaching 1,000+ schools and ~5M students. Built dynamic learning UIs with React, Redux, Styled-components, and TypeScript.
- React
- Redux
- Styled-components
- TypeScript
ReactFlurt
Premium lifestyle network spanning real-life events, an app, and the metaverse. Built immersive UIs with React, Redux, and Chakra UI.
- React
- Redux
- Chakra UI
- JavaScript
Reactu&u Recruitment
Australia's top recruitment agency website. Improved UX and performance with React, Next.js, TypeScript, and Tailwind CSS.
- React
- Next.js
- TypeScript
- Tailwind CSS
ReactTeam Driven Real Estate
Real-estate listings platform for the Greater Las Vegas Valley. Built a seamless property-search experience with React, Redux, Bootstrap, and TypeScript.
- React
- Redux
- Bootstrap
- TypeScript
ReactArtxpro
Full-service digital marketing agency site. Enhanced UX and performance with React, Next.js, and Bootstrap.
- React
- Next.js
- JavaScript
- Bootstrap
ReactNetguru
Digital-acceleration & custom software company website, built with React, Redux, and Bootstrap.
- React
- Redux
- Bootstrap
- JavaScript
VueMatchWornShirt
Marketplace for authentic match-worn & signed football shirts supporting charities. Built a user-friendly storefront with Vue, Nuxt, Vuex, Bootstrap, and TypeScript.
- Vue
- Nuxt
- Vuex
- TypeScript
VueTutorful
Private-tutor marketplace with 3M+ lessons taught. Enhanced UX and functionality with Vue, Vuex, Element UI, and JavaScript.
- Vue
- Vuex
- Element UI
- JavaScript
VueDream Exotic Rentals
Worldwide luxury villa & vacation-home rental platform. Crafted an immersive booking experience with Vue, Vuex, Bootstrap, and JavaScript.
- Vue
- Vuex
- Bootstrap
- JavaScript
VueLiving Spaces
Outdoor furniture catalog for a major home-decor retailer. Built responsive, dynamic shopping features with Vue, Vuex, Bootstrap, and TypeScript.
- Vue
- Vuex
- Bootstrap
- TypeScript
More on github.com/apollo-1004
How I work
A pragmatic, transparent workflow that keeps you in the loop from first idea to production and beyond.
Discover
I dig into your goals, users, and constraints — turning fuzzy requirements into a clear, prioritized technical plan.
Architect
Data models, APIs, and system design are mapped out up front. I pick the right stack for performance and longevity.
Build
Iterative development with clean, tested, reviewed code and frequent demos — so there are no surprises at the end.
Ship & Iterate
Deploy with CI/CD, monitor in production, then optimize and extend based on real-world usage and feedback.
How I build with AI
My end-to-end loop for shipping LLM-powered products — from raw data to a monitored system that keeps getting better.
Data
Collect, clean & curate high-quality datasets that reflect the real task.
Train & Fine-tune
Build ML pipelines and adapt models so they reason the way the product needs.
Evaluate
Benchmark outputs for accuracy, safety, and reliability against clear criteria.
RLHF
Rank, annotate, and compare responses with human feedback to steer the model.
Deploy
Ship into production via RAG, AI agents, and well-guarded APIs.
Monitor
Observe live behavior, catch drift, and feed insights back into the loop.
Anatomy of a Retrieval-Augmented Generation request
How retrieval grounds an LLM's answer in real, trusted data — the pattern behind reliable AI features.
- User queryThe question to answer
- EmbedEncode into a vector
- Vector searchMatch the knowledge base
- Top-K contextMost relevant chunks
- LLM + promptGrounded generation
- Grounded answerCited, accurate reply
By the numbers
Good questions, answered
A few things people usually want to know before reaching out.
Yes — I'm open to senior AI and full-stack roles, contract engagements, and interesting collaborations. I usually reply within a day.
Let's build something intelligent
Open to senior AI & full-stack opportunities, contract work, and interesting collaborations. I usually reply within a day.