John Harrison

Senior technical lead delivering Java/Spring Boot microservices and React/TypeScript single-page applications on AWS. Standardized service templates (Spring Boot/JPA/OpenTelemetry) to improve release cadence and onboarding. Designed and versioned REST and GraphQL APIs with OAuth2/OIDC authorization using contract-first practices to reduce breaking changes. Built a React/TypeScript SPA platform with shared component libraries and performance budgets to reduce user-flow latency. Implemented end-to-end observability with OpenTelemetry, Prometheus, Grafana, and CloudWatch to improve MTTR via dashboards, SLOs, and trace-driven triage. Automated infrastructure and delivery with Terraform, Docker, Kubernetes, and CI/CD (GitHub Actions/Jenkins), including gated deployments and automated rollbacks. Performed distributed performance debugging with JVM profiling and load tests to reduce p95 latency and stabilize throughput. Introduced LLM-assisted workflows using semantic search across repositori

Led delivery of Java/Spring Boot microservices on AWS. Standardized service templates (Spring Boot/JPA/OpenTelemetry) to improve release cadence by 35% and reduce onboarding time for new services. Designed and versioned REST and GraphQL APIs with OAuth2/OIDC authorization, using contract-first practices to reduce breaking-change incidents by 40%. Built a React/TypeScript SPA platform with shared component libraries and performance budgets, reducing key user-flow latency by 25% via browser profiling and bundle analysis. Implemented end-to-end observability with OpenTelemetry, Prometheus/Grafana, and CloudWatch, improving MTTR by 45% through actionable dashboards, SLOs, and trace-driven incident triage. Automated infrastructure provisioning with Terraform and delivery pipelines with GitHub Actions and Jenkins, including gated deployments, automated rollbacks, and environment parity using Docker and Kubernetes. Performed distributed performance debugging using JVM profiling and load testi

Owned front-end architecture for growth-focused web experiences using Next.js, React, and TypeScript; built reusable patterns for routing, layouts, and content-driven pages. Created and maintained a Storybook-based component library with standardized accessibility behaviors (keyboard navigation, focus management, ARIA) aligned to WCAG 2.1 AA. Improved performance across critical pages via Next.js rendering strategies (SSG/SSR/ISR), image optimization, and caching controls to enhance Core Web Vitals (LCP/CLS) and reduce mobile bounce. Integrated headless CMS workflows (Contentful-style modeling) with strongly typed TypeScript props to enable safe marketing updates. Designed lead-gen form architecture with React Hook Form-style patterns, server-side validation, and bot mitigation to reduce spam and improve completion. Instrumented analytics via tag management and a consistent data layer for conversion tracking and funnel measurement. Established CI quality gates with Git, CI/CD, Jest, an