Available to hire
Hi, I’m Marcus Mellis, a passionate Senior Full Stack Software Engineer with extensive experience building scalable and modern web applications. I specialize in JavaScript ecosystems including TypeScript, React, and Node.js, alongside backend development with Golang and Python. I thrive in innovative, cross-functional environments and strongly believe in team collaboration and agile practices.
Over the years, I’ve worked on high-performance enterprise SaaS solutions, delivering clean, maintainable code and optimized user experiences. I love tackling challenging projects that push the boundaries of technology and enjoy using my skills to build efficient, reliable, and user-friendly software.
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Language
English
Fluent
Work Experience
Senior Software Engineer at DocuSign
June 1, 2023 - June 11, 2024Led the development of SaaS-based document automation and digital agreement solutions, focusing on enterprise-level integrations and AI-powered workflows. Utilized multiple technologies including JavaScript, TypeScript, React, Node.js, Golang, Python, Docker, and Kubernetes. Developed features like collaborative editing handling 50,000 concurrent users, digital agreement pipeline processing 100,000 documents daily, and implemented AI-based signature verification. Enhanced system performance, deployed scalable microservices on AWS, and improved API performance with technologies like GraphQL and Redis. Established advanced monitoring with ELK stack and Prometheus, and automated end-to-end testing to reduce bugs significantly.
Senior Software Engineer at Apple
May 1, 2021 - May 31, 2023Led the development of an internal data visualization platform for enterprise-level performance monitoring with real-time interactive dashboards. Utilized React, Node.js, Go, Swift, Python, Kubernetes, and Docker to deliver high-availability solutions. Developed performance monitoring dashboards, data aggregation services processing large data from IoT devices, a real-time alerting system, and improved user authentication securing access for over 200,000 employees. Automated testing and deployment with CI/CD pipelines, reducing release times significantly.
Software Engineer at Pinterest
June 1, 2018 - May 31, 2021Contributed to development and deployment of an interactive content recommendation engine using Python, Ruby on Rails, GraphQL, React, and Kubernetes. Focused on optimizing personalized feed algorithms which increased user engagement by 20% through data-driven content curation.
Software Engineer at Apple
June 1, 2017 - May 31, 2018Developed internal data visualization and analytics tools for performance monitoring using React, D3.js, Node.js, and Python. Created interactive dashboards to improve operational efficiency by enabling real-time insights across teams.
Software Engineer at Walmart Global eCommerce
June 1, 2016 - May 31, 2017Modernized legacy e-commerce systems by integrating React/Redux, Node.js, and Hapi framework for the Sam’s Club web application. Enhanced performance and maintainability while managing high-traffic requests up to 10,000 per second.
Senior Software Engineer at DocuSign
June 1, 2023 - PresentLed the development of SaaS-based document automation and digital agreement solutions, focusing on enterprise-level integrations and AI-powered workflows. Utilized JavaScript, TypeScript, React, Node.js, Golang, Python, Docker, Kubernetes, and CSS frameworks to build scalable, high-performance software solutions. Key achievements include building a collaborative editing feature for 50,000 concurrent users, developing a digital agreement pipeline processing 100,000 documents daily, enhancing rendering performance with SSR, improved API performance using Golang and GraphQL, AI-based signature verification, and zero downtime microservices deployment on AWS ECS.
Senior Software Engineer at Apple
May 31, 2023 - July 29, 2025Led the development of an internal data visualization platform for enterprise-level performance monitoring and analysis, focusing on web-based interactive dashboards and real-time data processing. Built performance monitoring dashboards, implemented data aggregation services processing 500,000 points per hour, integrated real-time alerting systems, designed data ingestion pipelines, enhanced user authentication for over 200,000 employees, and set up CI/CD pipelines to automate testing and deployment, reducing release times by 70%.
Software Engineer at Pinterest
May 31, 2021 - July 29, 2025Contributed to development and deployment of interactive content recommendation engine leveraging Python, Java, Ruby on Rails, GraphQL, React, and Kubernetes. Optimized personalized feed algorithms and boosted user engagement by 20% through data-driven content curation.
Software Engineer at Apple
May 31, 2018 - July 29, 2025Developed internal data visualization and analytics tools for performance monitoring using React, D3.js, Node.js, and Python to create interactive dashboards, improving operational efficiency by providing real-time insights for cross-functional teams.
Software Engineer at Walmart Global eCommerce
May 31, 2017 - July 29, 2025Modernized legacy e-commerce systems by integrating React/Redux, Node.js, and Hapi for the Sam’s Club web app, significantly enhancing performance and maintainability while managing high-traffic user requests of up to 10,000 per second.
Senior Software Engineer at DocuSign
June 1, 2023 - PresentLed the development of SaaS-based document automation and digital agreement solutions, focusing on enterprise-level integrations and AI-powered workflows. Utilized JavaScript, TypeScript, React, Node.js, Golang, Python, Docker, Kubernetes, and CSS frameworks to build scalable, high-performance software solutions. Delivered features including a collaborative editing feature managing 50,000 concurrent users, a digital agreement pipeline processing 100,000 documents daily, enhanced rendering and API performances, an AI-based signature verification module, and deployed microservices on AWS ECS with zero downtime. Improved monitoring and testing practices, enhancing bug detection and system reliability.
Senior Software Engineer at Apple
May 31, 2023 - July 29, 2025Led the development of an internal data visualization platform for enterprise performance monitoring and analysis, focusing on web-based interactive dashboards and real-time data processing. Built a performance monitoring dashboard visualizing large datasets, implemented data aggregation services processing 500,000 data points per hour, integrated real-time alerting system, designed automated data ingestion pipelines, enhanced user authentication with OAuth 2.0, and set up CI/CD pipelines automating testing and deployment, reducing release times by 70%.
Software Engineer at Pinterest
May 31, 2021 - July 29, 2025Contributed to the development and deployment of an interactive content recommendation engine, leveraging Python, Java, Ruby on Rails, GraphQL, React, and Kubernetes. Optimized personalized feed algorithms and boosted user engagement by 20% through data-driven content curation.
Software Engineer at Apple
May 31, 2018 - July 29, 2025Developed internal data visualization and analytics tools for performance monitoring using React, D3.js, Node.js, and Python to create interactive dashboards, improving operational efficiency by enabling real-time insights for cross-functional teams.
Software Engineer at Walmart Global eCommerce
May 31, 2017 - July 29, 2025Modernized legacy e-commerce systems by integrating React/Redux, Node.js, and Hapi for the Sam’s Club web app. Significantly enhanced performance and maintainability while managing high-traffic user requests of up to 10,000 per second.
Education
Bachelor of Science at University of California
July 1, 2012 - May 31, 2016Bachelor of Science at University of California
July 1, 2012 - May 31, 2016Bachelor of Science at University of California
July 1, 2012 - May 31, 2016Qualifications
Industry Experience
Software & Internet, Computers & Electronics, Retail, Media & Entertainment, Professional Services, Consumer Goods
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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