Daniel Pfeifer

Lead Software Engineer | Full-Stack | 12+ Years Startup Experience

San Diego, California, United States

About

Lead Software Engineer with 10+ years of experience building and scaling high-impact systems across healthcare, adtech, and fintech. I specialize in cloud-native architecture, full-stack development, and technical leadership — turning ambiguous business problems into reliable, scalable solutions that actually ship. Over the course of my career, I've led engineering teams through complex cloud migrations on AWS, built backend systems handling millions of daily requests, and most recently, developed an AI-powered IVR system that transformed how patients schedule appointments at scale. I care deeply about engineering quality — not just writing good code, but raising the bar for the teams around me through mentorship, architecture guidance, and building cultures of continuous improvement. My toolkit spans JavaScript/TypeScript, React, Node.js, Ruby on Rails, Go, Python, and cloud infrastructure with AWS and Terraform. But beyond the tech stack, what I bring to a team is the ability to bridge engineering and business — aligning roadmaps, managing technical debt strategically, and keeping delivery predictable without sacrificing long-term platform health. I'm always interested in connecting with fellow engineers, product leaders, and teams solving hard problems at scale.

Experience

  • Lead Software Engineer at Perlman Clinic
    Apr 2022 - May 2026 · 4 yrs 2 mos

    As Lead Software Engineer at Perlman Clinic, I provided technical leadership across a team of engineers through architecture guidance, mentorship, and performance coaching, while partnering closely with product and business stakeholders to translate ambiguous requirements into actionable technical plans. I shaped the engineering roadmap by balancing product delivery with long-term scalability needs, and drove alignment between engineering and business teams to reduce iteration cycles and improve delivery predictability. On the technical side, I led an end-to-end redesign of the cloud infrastructure on AWS, introducing a scalable serverless frontend architecture, EC2-based backend systems with load balancing, and NoSQL data stores to support high-throughput workloads.

  • Lead Software Engineer at UE.co (Now DMS Insurance)
    Sep 2017 - Apr 2022 · 4 yrs 8 mos

    At UE.co I work as a full stack engineer with PHP, MySQL, Node.js, MongoDB, React.js, and Angular.js. Here I've taken what I've learned at previous companies and applied it that knowledge to a much broader array of technologies and complex applications. If I've taken anything away from UE, its how all of the pieces of the puzzle fit together.

  • Senior Software Engineer at TrackTrain / Exposure Tracker
    Jun 2016 - Sep 2017 · 1 yr 4 mos

    Exposure Tracker was a exposure tracking application built to provide firefighters and medical staff a method of tracking exposure that they may come in contact with throughout the course of they're work. Here I was in charge of managing a team of engineers to rebuild the application from the ground up using Ruby on Rails as a framework and React.js to support the front-end.

  • Software Engineer at StockTwits
    Mar 2012 - Jun 2016 · 4 yrs 4 mos

    StockTwits is a social networking application messaging app built around the discussion of stocks and investing. They've now grown to support a network of over 1 million users. StockTwits was my first entry into the startup world and my first software position. I spent my first year doing back-end and front-end work on wordpress sites for various media and blog outlets, The last 3 years working for StockTwits I spent my time working on the main application doing both back-end (Ruby) and front-end (JavaScript).