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Justin L. Espiritu

Senior Software Engineer & AI Engineer

Summary

Results-driven Senior Software Engineer, Team Lead, and Agile Practitioner with 7+ years of experience architecting high-performance web/mobile applications and pioneering AI agentic workflows. Expert in building custom MCP servers, agentic tools, and developer platforms that scale to 1,000+ enterprise users, reducing feature cycle times from weeks to 1–3 days.

Experience

Senior Software Engineer & AI Engineer

March 2022 - Present
Cotality

Championing a full AI agentic workflow using Claude Code in a poly-repo environment of 42+ microservices, serving as a Scrum Master, and leading full-stack and mobile engineering.

  • Serve as the Mobile Development Lead for the Dispatch application, owning the end-to-end design, implementation, and maintenance of a React Native app deployed to the Google Play and Apple App Stores.
  • Upgraded the mobile application from React Native 0.67 to the latest version and migrated to Expo to guarantee long-term maintainability and remove manual build/distribution pipelines.
  • Design, implement, and maintain backend services across 42+ microservices in a poly-repo environment, utilizing Claude Code to create and maintain CLAUDE.md workspace guidelines.
  • Leverage agentic AI workflows to generate detailed feature plans and ticket specifications; personally authoring/reviewing 50% of the plans to keep humans in the loop and prevent unchecked AI execution.
  • Developed an AI agent to analyze open Pull Requests, comparing implementation against ticket requirements and plans with a custom confidence scale to streamline code review.
  • Created an AI alert response agent that automatically generates root cause analyses (RCA) to accelerate on-call developer triage and resolution.
  • Built an AI-driven agent to flag and route stale PRs to necessary developers and product owners, reducing administrative overhead and keeping developers focused on high-priority items.
  • Created custom Claude skills, commands, and custom MCP (Model Context Protocol) servers, sharing them via an internal team marketplace (10 developers) and scaling to the broader enterprise (1,000+ engineers) to automate daily workflows.
  • Reduced average feature planning and execution cycle time from 1 week down to 1–3 days on average by standardizing agentic software engineering workflows.
  • Perform Scrum Master duties (standups, retros, grooming), optimizing Azure Boards tracking to prevent burnout and ensure balanced team workloads.

Software Engineer

September 2021 - February 2022
Rock Central

Supported 1,000+ employees across the Rocket Mortgage ecosystem by building automated onboarding systems, migrating legacy systems with zero downtime, and engineering core backend refactors.

  • Acted as the Subject Matter Expert (SME) for multiple internal products across the Rocket Mortgage ecosystem, supporting 1,000+ employees.
  • Architected a standardized onboarding system using Hugo and Git Pages, reducing new engineer ramp-up time by 50% (from 2 weeks to 1 week).
  • Led front-end UI development and automated CI/CD deployments via Azure DevOps for the Resource Manager platform.
  • Orchestrated large-scale production migrations for legacy .NET systems (Checkmate), ensuring zero-downtime transitions.
  • Engineered a core logic refactor for VendorDocs, implementing a testing suite that increased unit test coverage to 85%+.
  • Collaborated with business owners and 'Guardians of Quality' to establish strict coding standards and actionable technical stories.

Software Engineer

August 2019 - August 2021
Aperture Labs LLC

Engineered high-performance, full-stack E-commerce integrations and customized data management systems (PIM, CRM) for high-volume consumer platforms.

  • Engineered robust full-stack E-commerce solutions for clients like the Arbor Day Foundation, processing 10,000+ orders during peak seasons.
  • Designed and implemented a custom reporting module that reduced report generation and viewing time by 50% for administrative users.
  • Built custom data extensions for inRiver PIM to optimize product tracking for catalogs containing 1,000+ SKUs.
  • Developed deep backend customizations for nopCommerce and EpiServer (Secura), including IP-based geolocation and business telemetry.

Teamcenter Implementations Engineer

January 2019 - July 2019
Mercury Marine

Configured and maintained global Teamcenter PLM integrations, change management systems, and data synchronization pipelines for enterprise manufacturing teams.

  • Orchestrated deep-level Teamcenter PLM solutions, configuring BMIDE, BOM Management, and complex Workflows for a global manufacturer.
  • Streamlined change management and access control protocols, enhancing data reliability across distributed engineering teams.
  • Performed complex data modeling to synchronize thousands of technical specifications, ensuring high-fidelity data migration.
  • Resolved critical configuration constraints, maintaining high system availability for a massive concurrent user base.

Web Application Developer

March 2017 - December 2018
University of Wisconsin - Oshkosh

Redesigned and implemented core academic advising software used by thousands of students and advisors, standardizing frontend components with reusable directives.

  • Lead developer for the rewrite of the Advising Worksheet from Plone to AngularJS, radically improving user flow for 1,000s of students.
  • Developed mission-critical software utilized by 15+ professional advisors to manage academic graduation plans university-wide.
  • Engineered a library of reusable AngularJS directives that standardized dynamic form creation and accelerated future development.
  • Authored comprehensive technical documentation in Confluence to ensure project continuity and a seamless handoff.

Research Assistant

Jan 2017 - May 2017
University of Wisconsin - Oshkosh

Developed custom NLP applications in Python to automate high-volume data extraction and linguistic text summarization.

Key Projects

Dispatch React Native, React, Claude, GitHub Copilot, .Net Core, CosmosDB

  • Mission-critical insurance platform processing 500-1,000+ daily tasks and assigning to 1,000+ resources.
  • Leveraged AI architectural assistants to hyper-accelerate core mobile feature implementation and CI/CD automation.

Resource Manager Angular, Jasmine, .Net Core, Azure DevOps, SQL

  • Centralized resource management tool supporting internal company-wide operations.
  • Led front-end UI development and automated deployments to multi-tier environments within Azure DevOps.

Checkmate .Net Framework, jQuery

  • Legacy system migration orchestrating massive production deployments with zero downtime via Azure DevOps.

VendorDocs .Net Framework

  • Authored comprehensive unit tests extending application coverage safely beyond 85%.
  • Refactored core business logic to process newly structured CSV files over legacy models.

Arbor Day Foundation nopCommerce

  • High-traffic E-commerce platform processing 10,000+ orders during peak seasonal periods.
  • Integrated IPGeolocation APIs and Google Analytics for advanced business telemetry.

Other Projects

Advising Worksheet AngularJS, Plone

  • Streamlined graduation planning for thousands of students and 15+ advisors at UW Oshkosh.
  • Architected reusable components and comprehensive documentation for long-term project sustainability.

Portfolio Website Hugo, Antigravity

Personal portfolio website (https://justinlespiritu.com)

  • Architected a high-performance, data-driven portfolio using Hugo and Antigravity-assisted development.
  • Implemented premium, metric-heavy resume layouts and automated PDF generation workflows.

boulderLeague Flutter, Claude, Firebase

  • Rapidly prototyped a robust mobile application using Claude as an AI architectural assistant.
  • Implemented a scalable, real-time database architecture utilizing Firebase for user progression tracking.

Skills

Agile & Leadership: Scrum Master (Facilitation, Retros, Grooming), Agile Transformation, SDLC Optimization, Team Mentorship, Tech Hiring, Cross-functional Leadership
AI & Modern Workflows: Claude Code, GitHub Copilot, Gemini, Agentic Workflows, AI-First Architecture, Prompt Engineering
Frameworks & Libraries: React Native, React, MUI, Angular 2+, .Net Core, .Net Framework, MVC, Vue, NodeJS
Languages: TypeScript, JavaScript, C#, HTML/CSS, Python, SQL, Java
Technologies & Cloud: GCP, Azure, Firebase, Fastlane, AWS, Circle CI, Docker, Git, Hugo, Google Analytics
Databases: CosmosDB, MySQL, Microsoft SQL Server, Firebase

Experience

Senior Software Engineer & AI Engineer at Cotality
March 2022 - Present

Championing a full AI agentic workflow using Claude Code in a poly-repo environment of 42+ microservices, serving as a Scrum Master, and leading full-stack and mobile engineering.

  • Serve as the Mobile Development Lead for the Dispatch application, owning the end-to-end design, implementation, and maintenance of a React Native app deployed to the Google Play and Apple App Stores.
  • Upgraded the mobile application from React Native 0.67 to the latest version and migrated to Expo to guarantee long-term maintainability and remove manual build/distribution pipelines.
  • Design, implement, and maintain backend services across 42+ microservices in a poly-repo environment, utilizing Claude Code to create and maintain CLAUDE.md workspace guidelines.
  • Leverage agentic AI workflows to generate detailed feature plans and ticket specifications; personally authoring/reviewing 50% of the plans to keep humans in the loop and prevent unchecked AI execution.
  • Developed an AI agent to analyze open Pull Requests, comparing implementation against ticket requirements and plans with a custom confidence scale to streamline code review.
  • Created an AI alert response agent that automatically generates root cause analyses (RCA) to accelerate on-call developer triage and resolution.
  • Built an AI-driven agent to flag and route stale PRs to necessary developers and product owners, reducing administrative overhead and keeping developers focused on high-priority items.
  • Created custom Claude skills, commands, and custom MCP (Model Context Protocol) servers, sharing them via an internal team marketplace (10 developers) and scaling to the broader enterprise (1,000+ engineers) to automate daily workflows.
  • Reduced average feature planning and execution cycle time from 1 week down to 1–3 days on average by standardizing agentic software engineering workflows.
  • Perform Scrum Master duties (standups, retros, grooming), optimizing Azure Boards tracking to prevent burnout and ensure balanced team workloads.
Software Engineer at Rock Central
September 2021 - February 2022

Supported 1,000+ employees across the Rocket Mortgage ecosystem by building automated onboarding systems, migrating legacy systems with zero downtime, and engineering core backend refactors.

  • Acted as the Subject Matter Expert (SME) for multiple internal products across the Rocket Mortgage ecosystem, supporting 1,000+ employees.
  • Architected a standardized onboarding system using Hugo and Git Pages, reducing new engineer ramp-up time by 50% (from 2 weeks to 1 week).
  • Led front-end UI development and automated CI/CD deployments via Azure DevOps for the Resource Manager platform.
  • Orchestrated large-scale production migrations for legacy .NET systems (Checkmate), ensuring zero-downtime transitions.
  • Engineered a core logic refactor for VendorDocs, implementing a testing suite that increased unit test coverage to 85%+.
  • Collaborated with business owners and 'Guardians of Quality' to establish strict coding standards and actionable technical stories.
Software Engineer at Aperture Labs LLC
August 2019 - August 2021

Engineered high-performance, full-stack E-commerce integrations and customized data management systems (PIM, CRM) for high-volume consumer platforms.

  • Engineered robust full-stack E-commerce solutions for clients like the Arbor Day Foundation, processing 10,000+ orders during peak seasons.
  • Designed and implemented a custom reporting module that reduced report generation and viewing time by 50% for administrative users.
  • Built custom data extensions for inRiver PIM to optimize product tracking for catalogs containing 1,000+ SKUs.
  • Developed deep backend customizations for nopCommerce and EpiServer (Secura), including IP-based geolocation and business telemetry.
Teamcenter Implementations Engineer at Mercury Marine
January 2019 - July 2019

Configured and maintained global Teamcenter PLM integrations, change management systems, and data synchronization pipelines for enterprise manufacturing teams.

  • Orchestrated deep-level Teamcenter PLM solutions, configuring BMIDE, BOM Management, and complex Workflows for a global manufacturer.
  • Streamlined change management and access control protocols, enhancing data reliability across distributed engineering teams.
  • Performed complex data modeling to synchronize thousands of technical specifications, ensuring high-fidelity data migration.
  • Resolved critical configuration constraints, maintaining high system availability for a massive concurrent user base.
Web Application Developer at University of Wisconsin - Oshkosh
March 2017 - December 2018

Redesigned and implemented core academic advising software used by thousands of students and advisors, standardizing frontend components with reusable directives.

  • Lead developer for the rewrite of the Advising Worksheet from Plone to AngularJS, radically improving user flow for 1,000s of students.
  • Developed mission-critical software utilized by 15+ professional advisors to manage academic graduation plans university-wide.
  • Engineered a library of reusable AngularJS directives that standardized dynamic form creation and accelerated future development.
  • Authored comprehensive technical documentation in Confluence to ensure project continuity and a seamless handoff.
Research Assistant at University of Wisconsin - Oshkosh
Jan 2017 - May 2017

Developed custom NLP applications in Python to automate high-volume data extraction and linguistic text summarization.

Key Projects

DispatchReact Native, React, Claude, GitHub Copilot, .Net Core, CosmosDB
  • Mission-critical insurance platform processing 500-1,000+ daily tasks and assigning to 1,000+ resources.
  • Leveraged AI architectural assistants to hyper-accelerate core mobile feature implementation and CI/CD automation.
Resource ManagerAngular, Jasmine, .Net Core, Azure DevOps, SQL
  • Centralized resource management tool supporting internal company-wide operations.
  • Led front-end UI development and automated deployments to multi-tier environments within Azure DevOps.
Checkmate.Net Framework, jQuery
  • Legacy system migration orchestrating massive production deployments with zero downtime via Azure DevOps.
VendorDocs.Net Framework
  • Authored comprehensive unit tests extending application coverage safely beyond 85%.
  • Refactored core business logic to process newly structured CSV files over legacy models.
Arbor Day FoundationnopCommerce
  • High-traffic E-commerce platform processing 10,000+ orders during peak seasonal periods.
  • Integrated IPGeolocation APIs and Google Analytics for advanced business telemetry.

Other Projects

Advising WorksheetAngularJS, Plone
  • Streamlined graduation planning for thousands of students and 15+ advisors at UW Oshkosh.
  • Architected reusable components and comprehensive documentation for long-term project sustainability.
Portfolio WebsiteHugo, Antigravity

Personal portfolio website (https://justinlespiritu.com)

  • Architected a high-performance, data-driven portfolio using Hugo and Antigravity-assisted development.
  • Implemented premium, metric-heavy resume layouts and automated PDF generation workflows.
boulderLeagueFlutter, Claude, Firebase
  • Rapidly prototyped a robust mobile application using Claude as an AI architectural assistant.
  • Implemented a scalable, real-time database architecture utilizing Firebase for user progression tracking.

Education

Bachelor of Science in Computer Science (Software Engineering Emphasis)
December 2018
University of Wisconsin - Oshkosh