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Sean Paul Dunn Parmenter

@seanparmenter

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Lead Full-Stack Engineer specializing in scalable cloud-native Java and JavaScript systems.

United States

Message

What I'm looking for

I seek senior engineering roles where I can lead architecture and cloud-native initiatives, mentor teams, and build scalable, secure, high-performance systems.

I am a Lead Full-Stack Engineer with 12+ years of hands-on experience designing, implementing, and scaling enterprise-grade systems across Java and JavaScript ecosystems. I have led decomposition of monoliths into microservices, designed event-driven architectures with Kafka and messaging systems, and modernized legacy platforms to meet high concurrency and multi-region demands.

My work spans cloud infrastructure (AWS, Kubernetes), CI/CD automation, security (OAuth2.0, OIDC, JWT), and frontend performance (React, Next.js, Angular). I mentor engineers, set architectural direction, and deliver production-ready solutions that improve performance, reliability, and operational reproducibility.

Experience

Work history, roles, and key accomplishments

Lead Full Stack Engineer

Accenture

Nov 2022 - Dec 2025 (3 years 1 month)

Led end-to-end architecture and migration of a cloud-native Java17/SpringBoot SaaS platform serving millions of concurrent users, decomposing a monolith into microservices and improving scalability, resilience, and deployment velocity.

Java Spring Boot Kotlin React AWS Kubernetes Apache Kafka Terraform CI CD

Senior Full Stack Engineer

BigCommerce

Oct 2021 - Oct 2022 (1 year)

Designed and implemented enterprise e‑commerce systems handling flash-sale traffic and real-time inventory, introduced Next.js for SEO-critical pages and improved response times via caching and query optimization.

Java Spring Boot React Next.js AWS Kafka Redis Performance Optimization

Senior Java Full Stack Developer

WebFX

Jan 2019 - Jun 2021 (2 years 5 months)

Architected a cloud-based project management platform using Java/Spring Boot and React, introduced automated testing and infrastructure-as-code, and reduced environment setup time by ~60%.

Java Spring Boot React AWS Terraform Junit Mockito Elasticsearch

Java Full Stack Engineer

Quorum Software

Jul 2014 - Dec 2018 (4 years 5 months)

Developed enterprise systems with Java/SpringBoot and Angular, built document-processing pipelines on AWS Lambda/S3, and improved scalability via database tuning and Redis caching.