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I'm Francis Cullen, a Senior Full-Stack Engineer with 13+ years building scalable, distributed systems and APIs. I currently lead backend platform architecture and operational excellence at Intuit. I specialize in Node.js, NestJS, and GraphQL, with cloud-native experience on AWS, Kafka, and Redis. I’m passionate about designing resilient services, reducing incident response times, and exploring emerging technologies like LLMs and RAG pipelines in production. I focus on observability, developer productivity, and delivering seamless user experiences. I’m driven by building scalable, observable systems and empowering teams to ship high-quality features quickly. My goal is to continuously improve reliability, performance, and user satisfaction while embracing innovative approaches to data, AI, and automation.…I'm Francis Cullen, a Senior Full-Stack Engineer with 13+ years building scalable, distributed systems and APIs. I currently lead backend platform architecture and operational excellence at Intuit. I specialize in Node.js, NestJS, and GraphQL, with cloud-native experience on AWS, Kafka, and Redis. I’m passionate about designing resilient services, reducing incident response times, and exploring emerging technologies like LLMs and RAG pipelines in production. I focus on observability, developer productivity, and delivering seamless user experiences. I’m driven by building scalable, observable systems and empowering teams to ship high-quality features quickly. My goal is to continuously improve reliability, performance, and user satisfaction while embracing innovative approaches to data, AI, and automation.

Francis Cullen

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

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I'm Francis Cullen, a Senior Full-Stack Engineer with 13+ years building scalable, distributed systems and APIs. I currently lead backend platform architecture and operational excellence at Intuit. I specialize in Node.js, NestJS, and GraphQL, with cloud-native experience on AWS, Kafka, and Redis. I’m passionate about designing resilient services, reducing incident response times, and exploring emerging technologies like LLMs and RAG pipelines in production. I focus on observability, developer productivity, and delivering seamless user experiences. I’m driven by building scalable, observable systems and empowering teams to ship high-quality features quickly. My goal is to continuously improve reliability, performance, and user satisfaction while embracing innovative approaches to data, AI, and automation.…I'm Francis Cullen, a Senior Full-Stack Engineer with 13+ years building scalable, distributed systems and APIs. I currently lead backend platform architecture and operational excellence at Intuit. I specialize in Node.js, NestJS, and GraphQL, with cloud-native experience on AWS, Kafka, and Redis. I’m passionate about designing resilient services, reducing incident response times, and exploring emerging technologies like LLMs and RAG pipelines in production. I focus on observability, developer productivity, and delivering seamless user experiences. I’m driven by building scalable, observable systems and empowering teams to ship high-quality features quickly. My goal is to continuously improve reliability, performance, and user satisfaction while embracing innovative approaches to data, AI, and automation.

Available to hire

I’m Francis Cullen, a Senior Full-Stack Engineer with 13+ years building scalable, distributed systems and APIs. I currently lead backend platform architecture and operational excellence at Intuit. I specialize in Node.js, NestJS, and GraphQL, with cloud-native experience on AWS, Kafka, and Redis. I’m passionate about designing resilient services, reducing incident response times, and exploring emerging technologies like LLMs and RAG pipelines in production. I focus on observability, developer productivity, and delivering seamless user experiences.

I’m driven by building scalable, observable systems and empowering teams to ship high-quality features quickly. My goal is to continuously improve reliability, performance, and user satisfaction while embracing innovative approaches to data, AI, and automation.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at Intuit

August 1, 2012 - Present

Architected and developed the Self Help Content Service using FastAPI and Python, supporting millions of daily interactions across TurboTax and QuickBooks. Engineered the Point of Need platform, a high-availability service handling billions of plugin transactions per tax season with ultra-low anomaly rates. Integrated LangChain, VectorDB, and RAG pipelines to power GenAI-based recommendations and contextual content retrieval. Built scalable, fault-tolerant REST and GraphQL APIs for customer support across Intuit platforms. Designed and deployed Kafka and Google Cloud Pub/Sub pipelines for real-time analytics and alerting with 98%+ uptime SLAs. Led service modernization by migrating monoliths from Flask to FastAPI and Node.js, reducing average response times by over 70%. Orchestrated infrastructure on GCP using Terraform and automated CI/CD with GitHub Actions. Improved observability and incident response with Sentry, OpenTelemetry, and Grafana. Drove operational excellence, reducing MT

Junior Engineer / Marketing Manager at Clark and Markham LLP

May 1, 2009 - November 1, 2010

Developed backend web systems using PHP, MySQL, and custom CMS integrations to support legal campaigns and client portals. Transformed PSD designs into responsive, standards-compliant websites using XHTML, CSS, and JavaScript. Built marketing automation tools and custom mailing list systems using jQuery, PHP, and MySQL. Designed and launched cross-browser email campaigns to boost engagement and client conversion. Implemented UX enhancements with JavaScript, improving website usability and visitor retention. Led schema design and optimization for MySQL databases supporting marketing operations. Supported server administration and performed routine deployments, backups, and performance tuning. Designed UI components and interactive interfaces aligned with branding and legal standards. Created graphics and layouts using Photoshop for marketing collateral and digital assets. Collaborated with legal and design teams to align digital solutions with firm objectives.

Junior Engineer at Law Offices of Wasserman Kornheiser LLP

October 1, 2006 - June 1, 2009

Developed internal tools and web applications using Node.js, Angular 2+, and PostgreSQL for legal and HR workflows. Built RESTful APIs and data pipelines to support compliance reporting and internal process automation. Managed AWS infrastructure and implemented basic monitoring/logging with EC2 and S3. Processed HR and auditing data with Pandas, generating structured reports for operational use. Wrote unit and integration tests and contributed to code reviews to maintain system stability.

Junior Engineer at Evolve Medical Group

September 1, 2005 - September 1, 2006

Maintained and upgraded internal PHP-based systems used across patient and administrative departments. Transformed static PSDs into responsive web interfaces using XHTML/CSS and JavaScript. Integrated and customized CMS platforms for content publishing and patient engagement. Administered MySQL databases, performing backups, migrations, and optimization tasks. Managed server environments and implemented UI improvements to enhance end-user experience.