Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

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 Java and Spring Boot (Spring Cloud, Spring Security, Hibernate) paired with React and TypeScript, alongside Python and Node.js, backed by PostgreSQL and MongoDB. Reduced response times by 35%+, doubled throughput, and raised release frequency through clean architecture, query tuning, and CI/CD automation on AWS and Azure. Communicates clearly across teams and mentors engineers toward measurable, high-quality delivery.…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 Java and Spring Boot (Spring Cloud, Spring Security, Hibernate) paired with React and TypeScript, alongside Python and Node.js, backed by PostgreSQL and MongoDB. Reduced response times by 35%+, doubled throughput, and raised release frequency through clean architecture, query tuning, and CI/CD automation on AWS and Azure. Communicates clearly across teams and mentors engineers toward measurable, high-quality delivery.

Mark Shan





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 Java and Spring Boot (Spring Cloud, Spring Security, Hibernate) paired with React and TypeScript, alongside Python and Node.js, backed by PostgreSQL and MongoDB. Reduced response times by 35%+, doubled throughput, and raised release frequency through clean architecture, query tuning, and CI/CD automation on AWS and Azure. Communicates clearly across teams and mentors engineers toward measurable, high-quality delivery.…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 Java and Spring Boot (Spring Cloud, Spring Security, Hibernate) paired with React and TypeScript, alongside Python and Node.js, backed by PostgreSQL and MongoDB. Reduced response times by 35%+, doubled throughput, and raised release frequency through clean architecture, query tuning, and CI/CD automation on AWS and Azure. Communicates clearly across teams and mentors engineers toward measurable, high-quality delivery.

Available to hire

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 Java and Spring Boot (Spring Cloud, Spring Security, Hibernate) paired with React and TypeScript, alongside
Python and Node.js, backed by PostgreSQL and MongoDB. Reduced response times by 35%+, doubled throughput, and raised release frequency
through clean architecture, query tuning, and CI/CD automation on AWS and Azure. Communicates clearly across teams and mentors engineers
toward measurable, high-quality delivery.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Work Experience

Senior Full Stack Engineer at Melian Labs

July 1, 2023 - Present

Built multi-tenant microservices using Node.js, Express, and NestJS, reducing backend latency by 35%. Developed responsive React and Next.js TypeScript interfaces improving Core Web Vitals by 28%. Tuned MongoDB aggregations and PostgreSQL indexes to reduce complex query times by 40% for read-heavy workloads. Integrated OpenAI and LangChain to deliver RAG search for automated triage, improving accuracy by 22%. Migrated workloads to AWS ECS/Lambda/S3 with Azure App Service for resilient multi-region failover. Automated builds/releases with Docker, Kubernetes, and Terraform to shorten release cycles by 30%. Improved release confidence by integrating Jest, Playwright, and Cypress into CI and mentored 6 engineers through architecture reviews and code-quality standards.

Senior Software Engineer at Cognizant

November 1, 2019 - June 1, 2023

Designed backend services with NestJS/Express and Python, increasing system throughput by 32%. Built SEO-friendly React and Next.js frontends with Material UI, reducing bounce rate by 21% and improving engagement. Tuned MongoDB aggregations and PostgreSQL queries to reduce average API response latency by 37%. Implemented recommendation services combining Node.js with Python ML models to personalize content and increase click-through. Established AWS deployments (EC2, S3, Lambda) sustaining 99.9% uptime under peak fintech traffic. Streamlined CI/CD using Jenkins, Docker, and GitHub Actions to reduce release time from days to under an hour. Expanded automated testing with Jest/Mocha/Selenium to stabilize releases across services and partnered with product/design teams in Agile sprints.

Software Engineer II at Oculus

September 1, 2017 - November 1, 2019

Delivered SaaS backend modules in Node.js/Express and Ruby on Rails, providing REST services for 10+ clients. Refined React/Redux UI components in JavaScript, improving responsiveness and reducing render time by 18%. Restructured MySQL indexes and MongoDB schemas to improve database query speed by 30%. Configured AWS EC2 and S3 environments with Nginx to host and serve production applications. Set up CI/CD with GitHub Actions and Jenkins, increasing deployment reliability and reducing failures by 25%. Strengthened quality with Jest and Selenium suites, raising regression coverage to 80% before release. Supported peer code reviews and Agile ceremonies to improve maintainability and delivery flow.