Stack Developer Node Js

Summary

Versatile Full Stack Engineer with **+ years of experience building and scaling enterprise-grade web applications, AI/ML tools, and code evaluation systems. Specialized in React, TypeScript, Node.js, Next.js, GraphQL, and cloud-native development with a proven record of designing high-performance solutions, optimizing large-scale codebases, and leading cross-functional teams. Skilled in code review, debugging, performance optimization, secure architectures, and CI/CD automation, with experience at Apple, WiseTech Global, and SyenApp. Adept at collaborating across product, design, and research teams to deliver measurable impact on developer velocity, code quality, and user adoption. Experience

SyenApp

Senior Full Stack Developer 01/2023 - Present

Led development of SyenApp’s e-commerce platform (100K+ active users) using React (TypeScript), Node.js, and GraphQL, delivering scalable UI/UX solutions that improved customer engagement by 40% and reduced feature delivery time by 25%.

Designed and implemented a modular design system with WCAG 2.1 accessibility compliance, boosting platform usability and increasing customer retention by 32% across web and mobile. Architected GraphQL APIs and optimized schema designs for authentication and checkout flows, cutting average API response times by 30% and strengthening compliance with OAuth2 and PCI DSS security standards. Introduced Next.js SSR for high-traffic product pages, reducing TTFB by 48% and driving a 27% uplift in organic search traffic, directly improving revenue conversion.

Enhanced frontend performance by implementing lazy loading, dynamic imports, caching strategies, and CDN optimization, resulting in a 35% Lighthouse score increase and 22% lower bounce rates. Built and enforced Cypress + Playwright automated test suites, achieving 90%+ coverage, reducing production bugs by 60%, and enabling stable weekly releases.

Orchestrated Dockerized deployments on AWS ECS with GitHub Actions CI/CD pipelines, cutting release cycles by 40% and improving deployment reliability.

Partnered with product managers, designers, and AI engineers to test and evaluate LLM-powered e-commerce agents, identifying edge cases and improving code correctness and performance. Apple

Senior Front End Developer 01/2021 - 12/2022

Directed design and development of internal AI/ML model lifecycle management tools using React, Next.js, and TypeScript, enabling engineers to accelerate model training and evaluation cycles by 45%. Built and optimized GraphQL APIs with Apollo Client for model metadata and experiment tracking, improving data accessibility by 50% across distributed ML teams.

Developed reusable UI component libraries aligned with Apple’s strict design system and accessibility standards, tripling developer velocity and ensuring consistent UX across multiple internal apps. Implemented server-side rendering (SSR), code splitting, and caching strategies to cut page load times from 4.3s to 1.8s, improving engineer productivity and reducing workflow friction. Collaborated with backend engineers to integrate Express + MongoDB microservices with LLM evaluation pipelines, introducing schema validation and error-handling middleware that reduced API failures by 70%. Championed test automation frameworks (Jest, React Testing Library, Cypress), driving 95% automated coverage and enabling regression-free weekly releases.

Applied Apple’s identity-first security principles by implementing token-based auth flows, API proxy layers, and sensitive data masking, ensuring strict compliance with InfoSec requirements. Partnered with data scientists to review and rank model-generated code outputs, providing structured evaluation feedback that improved LLM code quality by 38%.

WiseTech Global

Senior Developer 04/2018 - 11/2020

Designed and delivered a real-time logistics and vehicle tracking platform using React, Node.js microservices, and Apollo GraphQL, scaling to 20K+ daily active users with 99.99% uptime. Led migration of legacy Java monolith to Node.js + Apollo Federation microservices, reducing release cycles by 45% and enabling modular deployments for faster innovation. Charles Walls

754-***-**** *.**********@*****.*** San Antonio, TX Integrated RxJS event streams and GraphQL subscriptions, powering real-time notifications and predictive alerts, which increased user engagement by 50% and reduced error rates by 30%. Optimized MongoDB schemas and indexes for trip history and geospatial queries, reducing query latency by 60% under high traffic loads.

Automated CI/CD pipelines with Jenkins, Docker, and AWS EventBridge, accelerating deployment times by 80% and improving reliability for global logistics clients. Collaborated with product teams to design scalable workflows and APIs for shipment tracking and customs clearance, enabling a 25% reduction in manual processing time. Conducted code reviews and architectural assessments to enforce maintainability, security compliance, and high performance, improving code quality metrics by 40% across the engineering team. Mentored developers on TypeScript adoption, code quality standards, and best practices, contributing to a 20% reduction in onboarding time for new engineers.

Trio Workforce Solutions

Full Stack Developer 04/2016 - 02/2018

Built and launched a cross-platform healthcare staffing platform using React, React Native, Node.js, and GraphQL, enabling thousands of professionals to connect with recruiters and employers. Designed and optimized GraphQL schemas and resolvers for job-matching algorithms, reducing redundant API calls by 55% and improving query performance by 40%.

Developed role-based UI workflows tailored to recruiters, candidates, and employers, increasing match success rates by 33% and enhancing user satisfaction scores.

Implemented Next.js SSR and SEO optimization strategies, leading to a 35% increase in organic traffic and 25% higher job application conversions within 3 months.

Introduced RBAC and OAuth2-based authentication flows, ensuring HIPAA compliance and reducing data breach risks by implementing secure tokenization and audit logging. Automated CI/CD pipelines on Azure DevOps with Dockerized deployments, achieving zero downtime deployments and reducing manual release efforts by 70%.

Established TDD workflows using Jest and Cypress, driving 80% reduction in post-release hotfixes and improving long- term product stability.

Collaborated with UX teams to deliver accessible, user-friendly interfaces that met WCAG standards, boosting daily active users by 40% and improving recruiter efficiency. Skills

Frontend: React, TypeScript, Next.js, Redux, Tailwind CSS, Material UI, GraphQL (Apollo Client), HTML5, CSS3, JavaScript (ES6+).

Backend: Node.js, Express.js, Apollo Server, REST APIs, C#, .NET Core, MongoDB, PostgreSQL, Firebase. AI/LLM Development: LLM evaluation, code generation assessment, prompt engineering, model fine-tuning, code diff analysis.

Architecture: Microservices, Server-Side Rendering (SSR), Event-Driven Design, API Gateway, Identity-First Security, Scalable Systems.

DevOps & Cloud: AWS (ECS, Lambda, S3, ELB, CloudWatch), Azure DevOps, GitHub Actions, Jenkins, Docker, Kubernetes, CI/CD pipelines.

Testing & Quality: Jest, React Testing Library, Cypress, Playwright, TDD/BDD frameworks, automated code review. Collaboration & Leadership: Agile/Scrum, cross-functional team leadership, code reviews, technical mentorship, stakeholder communication.

Education

University of Texas at Dallas

B.S. in Computer Science 01/2014

Linkedin + Github

www.linkedin.com/in/charles-walls-a344b037b

https://github.com/atropos0902

Projects

Web applications

https://data.apple.com/

https://www.victusglobal.com/

https://www.bloomberg.com/company

https://foreverclaw.com

https://alwaysreadyrepair.com

https://clawandfun.com

https://playthunderbird.com

https://monalee.co/

https://www.wannasplit.com/

https://marketing.juven.co/

https://www.trainwithkickoff.com/

https://www.lja.com/

https://classful.com/

https://enlythealth.com/

https://acies.ai/

https://liveglam.com/

Mobile applications

https://play.google.com/store/apps/details?id=com.syenapp&hl=en&gl=US&pli=1 https://apps.apple.com/us/app/syenapp-private-search-shop/id1567407492 https://play.google.com/store/apps/details?id=com.ahtg.insight&hl=en https://apps.apple.com/us/app/wedding-pool/id1531822756 https://play.google.com/store/apps/details?id=com.weddingpool&hl=en_US&gl=US https://play.google.com/store/apps/details?id=com.b2bwave https://apps.apple.com/us/app/b2b-wave-sales-rep/id1561068887 https://apps.apple.com/us/app/kickoff-personal-training/id1469977012 https://play.google.com/store/apps/details?id=com.kudos.fit&hl=en_US&gl=US https://apps.apple.com/us/app/restaurants-local-food-b%C5%8Dzt/id1500087580 https://apps.apple.com/us/app/honeyspot/id1384657784 https://apps.apple.com/ie/app/work-with-luke/id1528591739

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