Alex Chen

Senior Full-Stack & AI Engineer

✉ alex.chen@dev.io📞 +1 (555) 382-9102📍 San Francisco, CA🌐 alexchen.dev💻 github.com/alexchen-dev🔗 linkedin.com/in/alexchen-dev

Professional Summary

Full-Stack Software Engineer with 5+ years of experience designing high-throughput web applications, scalable backend microservices, and AI-driven data pipelines. Proven track record of reducing API latency by 45% and implementing zero-downtime CI/CD deployments.

Technical Core Competencies

Languages & Core Frameworks:TypeScript • JavaScript (ESNext) • Python 3.12 • React 19 • Next.js 15 • Node.js • FastAPI • HTML5/CSS3

Databases & AI Tools:PostgreSQL (pgvector) • Redis • Drizzle ORM • Prisma • LangChain • Gemini API • OpenAI API • Vector Search

DevOps & Architecture:Docker • Kubernetes • AWS (S3, EC2, EKS) • GitHub Actions • Vercel • Tailwind CSS • WebSockets • REST & GraphQL

Work Experience

Senior Full-Stack Engineer • NexusTech Systems

2023-01 – Present | San Francisco, CA

Architected Next.js 15 App Router frontend and FastAPI backend microservices handling 2M+ daily active requests.
Engineered PostgreSQL pgvector similarity search pipeline, cutting document search latency from 1.2s to sub-45ms.
Mentored 4 junior engineers and implemented strict TypeScript & ESLint code quality gates across 12 micro-frontends.

Backend & Systems Engineer • CloudPulse Solutions

2021-04 – 2022-12 | Austin, TX

Designed Redis-backed distributed rate-limiting middleware processing 50,000 requests/sec with zero error rates.
Containerized 8 core services using Docker and orchestrated multi-region Kubernetes rolling deployments on AWS EKS.
Optimized slow SQL query execution plans, reducing database IOPS overhead by 60%.

Frontend Web Developer • Velocity Labs

2019-06 – 2021-03 | Remote

Built interactive React dashboards with real-time WebSocket state updates for financial trading clients.
Implemented responsive Tailwind CSS components with WCAG AAA accessibility compliance across all major browsers.

Engineering Projects

OmniRAG AI Knowledge Workspacegithub.com/alexchen-dev/omnirag-ai

Enterprise multi-document vector retrieval platform with inline source citations and sub-50ms search latency.

Built custom TF-IDF Cosine Similarity vector store handling semantic search across PDF and Markdown documentation.
Integrated Google Gemini 1.5 Flash streaming API with interactive source citation drawers highlighting snippet match percentages.

Real-Time Voice AI Interviewergithub.com/alexchen-dev/voice-interviewer

WebRTC voice-to-voice mock technical interviewer with live Monaco code execution environment.

Developed Web Audio API volume spectrum analyzer and Framer Motion 3D visualizer orb for voice interaction.
Embedded Monaco editor supporting multi-language syntax highlighting and test case runner.

DevOps Incident Investigator Agentgithub.com/alexchen-dev/devops-agent

Autonomous multi-agent system analyzing server logs and issuing automated GitHub pull requests with fixes.

Engineered Redis Pub/Sub event queue and WebSockets log streaming daemon in FastAPI.
Implemented CrewAI agent graph to diagnose stack trace root causes and formulate Git patches.

Education & Qualifications

Bachelor of Science in Computer Science • University of California, Berkeley

2019-05 | GPA: 3.85 / 4.0