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Justin L. Espiritu

Senior Software Engineer / Team Lead & Agile Practitioner

Summary

Results-driven Senior Software Engineer and Team Lead with 7+ years of experience architecting high-performance web/mobile applications, leading agile engineering teams, and pioneering AI-assisted workflows to accelerate delivery.

Experience

Senior Software Engineer / Team Lead

March 2022 - Present
Cotality

Driving the organizational shift from Waterfall to CI/CD while serving as a de facto Scrum Master and AI-driven process pioneer.

  • 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 both the Google Play and Apple App Stores.
  • Manage mobile distribution and deployment pipelines using Fastlane, and testing distribution via Firebase.
  • Execute a successful migration to Expo for deployment, leveraging Claude to generate golden templates of primary features.
  • Design, implement, and maintain 40+ .NET backend services (out of 42 deployable services), ensuring robust integration with agentic Claude workflows and regularly updating public APIs for direct client and front-end consumption.
  • Drive front-end development using React, implementing efficient data fetching and state management with React Query and Axios.
  • Build complex user interfaces leveraging Material-UI (MUI) for responsive tables and forms, and Bryntum for a massive, feature-rich scheduling UI.
  • Lead and mentor a team of 4+ engineers, achieving a ~75% increase in feature velocity (measured via Azure Boards cycle time) through Agile transformation.
  • Architected and maintain 10+ custom Claude skills (Specify, Plan, Execute) that reduced average feature turnaround from 1 week to 1–2 days.
  • Facilitate daily stand-ups, retrospectives, and backlog grooming as a Scrum Master to maintain a high-performance, unblocked team environment.
  • Lead development for Dispatch, a mission-critical insurance claim platform processing 500–1,000+ daily tasks for a network of 1,000+ resources.
  • Design and implement 2+ major and 10+ minor features per sprint, including a geotracking system for real-time task automation.
  • Scaled an internal AI Champions training program to 20+ engineers and non-technical staff to eliminate operational bottlenecks.
  • Manage the full product lifecycle, prioritizing backlogs and technical debt to ensure consistent delivery of high-quality features.

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 / Team Lead at Cotality
March 2022 - Present

Driving the organizational shift from Waterfall to CI/CD while serving as a de facto Scrum Master and AI-driven process pioneer.

  • 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 both the Google Play and Apple App Stores.
  • Manage mobile distribution and deployment pipelines using Fastlane, and testing distribution via Firebase.
  • Execute a successful migration to Expo for deployment, leveraging Claude to generate golden templates of primary features.
  • Design, implement, and maintain 40+ .NET backend services (out of 42 deployable services), ensuring robust integration with agentic Claude workflows and regularly updating public APIs for direct client and front-end consumption.
  • Drive front-end development using React, implementing efficient data fetching and state management with React Query and Axios.
  • Build complex user interfaces leveraging Material-UI (MUI) for responsive tables and forms, and Bryntum for a massive, feature-rich scheduling UI.
  • Lead and mentor a team of 4+ engineers, achieving a ~75% increase in feature velocity (measured via Azure Boards cycle time) through Agile transformation.
  • Architected and maintain 10+ custom Claude skills (Specify, Plan, Execute) that reduced average feature turnaround from 1 week to 1–2 days.
  • Facilitate daily stand-ups, retrospectives, and backlog grooming as a Scrum Master to maintain a high-performance, unblocked team environment.
  • Lead development for Dispatch, a mission-critical insurance claim platform processing 500–1,000+ daily tasks for a network of 1,000+ resources.
  • Design and implement 2+ major and 10+ minor features per sprint, including a geotracking system for real-time task automation.
  • Scaled an internal AI Champions training program to 20+ engineers and non-technical staff to eliminate operational bottlenecks.
  • Manage the full product lifecycle, prioritizing backlogs and technical debt to ensure consistent delivery of high-quality features.
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