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Hi, I'm Mark C Clark, a Senior Software Engineer with 12+ years of experience designing and delivering scalable distributed systems. I design and ship robust backend architectures using Java, Python, and cloud-native services on AWS to deliver high-performance, reliable software. I thrive in cross-functional teams, mentoring engineers and turning complex product requirements into tangible features. I love performance optimization, CI/CD, and collaborating with product and design to speed delivery while maintaining quality.…Hi, I'm Mark C Clark, a Senior Software Engineer with 12+ years of experience designing and delivering scalable distributed systems. I design and ship robust backend architectures using Java, Python, and cloud-native services on AWS to deliver high-performance, reliable software. I thrive in cross-functional teams, mentoring engineers and turning complex product requirements into tangible features. I love performance optimization, CI/CD, and collaborating with product and design to speed delivery while maintaining quality.

Mark C Clark

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Hi, I'm Mark C Clark, a Senior Software Engineer with 12+ years of experience designing and delivering scalable distributed systems. I design and ship robust backend architectures using Java, Python, and cloud-native services on AWS to deliver high-performance, reliable software. I thrive in cross-functional teams, mentoring engineers and turning complex product requirements into tangible features. I love performance optimization, CI/CD, and collaborating with product and design to speed delivery while maintaining quality.…Hi, I'm Mark C Clark, a Senior Software Engineer with 12+ years of experience designing and delivering scalable distributed systems. I design and ship robust backend architectures using Java, Python, and cloud-native services on AWS to deliver high-performance, reliable software. I thrive in cross-functional teams, mentoring engineers and turning complex product requirements into tangible features. I love performance optimization, CI/CD, and collaborating with product and design to speed delivery while maintaining quality.

Available to hire

Hi, I’m Mark C Clark, a Senior Software Engineer with 12+ years of experience designing and delivering scalable distributed systems. I design and ship robust backend architectures using Java, Python, and cloud-native services on AWS to deliver high-performance, reliable software.

I thrive in cross-functional teams, mentoring engineers and turning complex product requirements into tangible features. I love performance optimization, CI/CD, and collaborating with product and design to speed delivery while maintaining quality.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Software Engineer at PayPal

August 1, 2011 - June 1, 2014

Developed secure payment processing system using Java and backend architectures within large-scale financial platforms, supporting 5M+ transactions per day. Optimized algorithms and database interactions to reduce latency by ~25%, and collaborated with cross-functional teams to translate business requirements into scalable technical solutions delivering 10+ critical payment features. Resolved production issues and improved system stability to reduce incident resolution time by ~30%.

Senior Staff Software Engineer at Nike

July 1, 2014 - June 1, 2017

Led design and delivery of scalable enterprise systems by leveraging Java, Python, AWS cloud services, and microservices architecture, resulting in 44% improvement in system performance and scalability. Architected cloud-native applications using AWS, Docker, Kubernetes, and GraphQL APIs, achieving a 25% reduction in latency and 99.99% service availability. Developed high-performance backend services and optimized system throughput; implemented caching and database tuning to further improve performance. Collaborated with product and design teams to deliver frontend components using React and TypeScript integrated with GraphQL APIs, improving user engagement by 17%. Mentored 8–12 engineers and promoted best practices to accelerate delivery.

Staff Software Engineer at Slack

June 1, 2017 - August 1, 2022

Led development of scalable backend systems using Java, C#, and AWS infrastructure with a microservices architecture supporting 10M+ daily active users and 99.99% uptime. Designed APIs using GraphQL and REST technologies integrated with React and TypeScript-based frontend. Improved system reliability through monitoring, alerting, and fault-tolerant architectures; reduced production incidents. Mentored 5–8 engineers and fostered cross-functional collaboration to improve delivery velocity.

Senior Software Engineer

August 1, 2022 - Present

Led design and delivery of scalable enterprise systems by leveraging Java, Python, AWS cloud services, and microservice architecture; architected cloud-native applications using AWS, Docker, Kubernetes, and GraphQL APIs, enhancing performance and reliability. Built high-performance backend services and frontend solutions using React and TypeScript integrated with GraphQL APIs. Mentored teams, championed best practices, and drove cross-functional collaboration to meet business objectives.

Senior Software Engineer at PayPal

July 1, 2014 - June 2, 2017

Led cross-functional initiatives; designed scalable technical solutions delivering 20+ major features on schedule. Built backend services using Java, Python, REST APIs, and GraphQL; mentored 5-8 engineers; advanced engineering culture and cross-team alignment.