Senior Full Stack Engineer - Node/React/AWS

Mark Shan

Senior Full Stack Engineer

********.***@*****.*** • github.com/cstudeo • Texas, United States SUMMARY

Passionate and Impact-driven Senior Full Stack Engineer with 8+ years building high-throughput, cloud-native platforms across SaaS, fintech, health, fitness, and e-commerce. Builds with Node.js, Express, and NestJS paired with React and Next.js in TypeScript, backed by MongoDB and PostgreSQL, alongside Python and Ruby on Rails. Reduced response times by 35%+, doubled throughput, and raised release frequency through resilient architecture, query tuning, and CI/CD automation on AWS and Azure. Communicates clearly across teams and mentors engineers toward measurable, reliable delivery.

SKILL SET – TOOLS & TECHNOLOGIES

Backend: Node.js, Express.js, NestJS, TypeScript, Fastify; Python, Django; Ruby on Rails; Socket.io, WebSockets, BullMQ, RabbitMQ, Apache Kafka, gRPC, microservices, event-driven architecture

Frontend: React.js, Next.js, TypeScript, JavaScript (ES2023), Redux Toolkit, Context API, Zustand, React Query, HTML5, CSS3, Tailwind CSS, Material UI, Vite, SSR/ISR, Code-splitting, Lazy Loading

APIs & Integrations: REST, GraphQL (Apollo), OpenAPI / Swagger, OAuth2, JWT, OIDC, SSO, API Gateway, Webhooks, Stripe, Twilio, SendGrid AI / ML & LLM: OpenAI & Anthropic Claude APIs, LangChain.js, LangGraph, LlamaIndex, Vercel AI SDK, RAG & embeddings, vector search (pgvector, Pinecone), AI-assisted Dev (Cursor, GitHub Copilot), Prompt Engineering Databases & Clouds: MongoDB, PostgreSQL, MySQL, Redis, Elasticsearch, DynamoDB AWS (ECS, EC2, Lambda, S3, CloudFront, CloudWatch), Azure

(App Service, Functions, AKS), GCP (Cloud Run, BigQuery) DevOps: Docker, Kubernetes, Terraform, GitHub Actions, Jenkins, GitLab CI, Nginx, OpenTelemetry, Sentry, Prometheus, Grafana QA & Testing: Jest, Mocha, Playwright, Cypress, Selenium, Supertest, contract testing, TDD Version Control: Git, GitHub, GitLab, Bitbucket

Project Management & Collaboration: Jira, ClickUp, Asana, Confluence, Slack, Agile (Scrum, Kanban) EXPERIENCE

Senior Full Stack Engineer Melian Labs 07/2023 – Present

• Built multi-tenant microservices in Node.js, Express, and NestJS, reducing backend latency 35%.

• Developed responsive React and Next.js interfaces in TypeScript, improving page-load speed and Core Web Vitals 28%.

• Reduced complex query times 40% by tuning MongoDB aggregations and PostgreSQL indexes for read-heavy loads.

• Integrated OpenAI and LangChain with Node services for RAG search, automating triage and lifting accuracy 22%.

• Migrated workloads onto AWS ECS, Lambda, and S3 with Azure App Service for resilient multi-region failover.

• Automated builds and releases with Docker, Kubernetes, and Terraform, shortening release cycles by 30%.

• Improved release confidence with Jest, Playwright, and Cypress suites integrated into the CI pipeline.

• Mentored 6 engineers through architecture reviews, sprint planning, and code-quality standards. Senior Software Engineer Cognizant 11/2019 – 06/2023

• Designed backend services with NestJS, Express, and Python, increasing system throughput by 32%.

• Created SEO-friendly React and Next.js frontends with Material UI, minimizing bounce rate 21% and improving engagement.

• Tuned MongoDB aggregations and PostgreSQL queries to reduce average API response latency by 37%.

• Implemented Node.js recommendation services with Python ML models to personalize content and raise click-through.

• Established AWS deployments across EC2, S3, and Lambda, sustaining 99.9% uptime under peak fintech traffic.

• Streamlined CI/CD with Jenkins, Docker, and GitHub Actions, reducing release time from days to under an hour.

• Expanded automated test coverage with Jest, Mocha, and Selenium to stabilize releases across services.

• Partnered with product and design teams in Agile sprints to align delivery with business priorities. Software Engineer II Oculus 09/2017 – 11/2019

• Delivered SaaS backend modules in Node.js, Express, and Ruby on Rails, supporting REST services for 10+ clients.

• Refined React and Redux UI components in JavaScript, improving responsiveness and reducing render time 18%.

• Restructured MySQL indexes and MongoDB schemas, improving database query speed by 30%.

• Configured AWS EC2 and S3 environments with Nginx to host and serve production web applications.

• Set up CI/CD with GitHub Actions and Jenkins, raising deployment reliability and cutting failures 25%.

• Strengthened quality with Jest and Selenium suites, lifting regression coverage to 80% pre-release.

• Supported peer code reviews and Agile ceremonies, improving code maintainability and delivery flow. CONTRIBUTED PROJECTS

Innova Health

https://www.innovahealth.com/

• Therapy EHR platform for skilled nursing facilities, automating clinical documentation, billing, and

scheduling.

• Built Node.js services and REST APIs on AWS,

integrating MatrixCare and PointClickCare for

clinical data exchange.

TurboTenant

https://www.turbotenant.com/

• Property management platform for landlords to

list units, screen tenants, sign leases, and collect rent online.

• Developed Node.js/Nest.js services on AWS with

PostgreSQL for tenant screening, online rent

payments, and listing syndication.

Evani

https://www.enavi.co/

• Shopify conversion-optimization agency using

research and A/B testing to raise e-commerce

revenue per visitor.

• Designed Node.js analytics services and A/B-test instrumentation on AWS to track experiments

and per-visitor revenue.

EDUCATION

Master of Science, Information Technology

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