Ronan Prugh
Software Engineer · Cloud systems, AI-powered developer tools, and full-stack products.
About
I'm a software engineer at Fiserv building cloud billing systems, CI/CD infrastructure, and full-stack financial applications. I graduated from the University of Michigan with a B.S.E. in Computer Science (Magna Cum Laude, 2023). I have a particular interest in how AI can reshape software development — at Fiserv I championed Agentic Spec-Driven Development across the engineering org, building custom Claude-powered tooling that cut feature development time by ~40% and reduced QA bug escape rate by ~30%.
Experience
Fiserv, Inc.
Software Engineer
- Designed and implemented database and middleware architecture for a new Azure Cloud billing application, processing ~1,000 invoices monthly for services, hardware, and licensed software.
- Championed Agentic Spec-Driven Development (SDD) across the engineering organization — designed and led workshops to train teammates on a Claude-powered workflow that formalized requirements before any code was written, reducing ambiguity-driven rework and aligning development with business intent.
- Built custom Claude prompts and tool-augmented agents to automate spec generation, code review, and test scaffolding, cutting average feature development time by ~40% and reducing bug escape rate to QA by ~30%.
- Contributed to design and full-stack development of Global Settlement Application used by Settlement and Accounting teams to reconcile transactions, track balances, and execute inter-bank transfers.
- Built and maintained CI/CD pipelines for 20+ legacy microservices using GitLab and Harness, reducing deployment friction and improving release reliability.
- Delivered back-end features for myFiserv internal platform supporting 1,000+ executive and manager-level employees for project, people, and incident management.
U of M Transportation Research Institute
Software Developer
- Built and enhanced Vanilla JS and React front-end tools for querying and visualizing Michigan crash data from 2004 to present.
- Remediated production defects across both front-end JavaScript and back-end Python codebases.
- Automated researcher workflows by building a scheduled PDF reporting system using Python.
CSG International
Software Engineering Intern
- Designed and implemented stub endpoints for third-party payment platforms to improve integration test coverage and effectiveness.
- Authored unit and component tests in xUnit, increasing code coverage from 60% to above 80%.
- Participated in full agile development cycle including daily stand-ups, story point estimation, design reviews, and code reviews.
- Performed regression testing and built defect reporting tools for back-end API endpoints and front-end UI.
Education
University of Michigan
B.S.E. Computer Science Engineering· Magna Cum Laude
Skills
Programming Languages
Frameworks & Libraries
Tools & Platforms
Practices
Projects
ScoreMate
Mobile-first sports score-tracker. Favorite teams and leagues, then see yesterday's results, today's games, and tomorrow's schedule at a glance.
ESPN Fantasy Stats
Multi-user web app for analyzing ESPN Fantasy Football leagues — standings, playoff brackets, scoreboard, team comparisons, and head-to-head records across seasons.