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Senior Full Stack Engineer who engineered migrations from monolithic Rails systems to service-oriented architectures, extracting payment processing and notification services to support 50K+ transactions/day with 99.95% uptime. Experienced with AI-augmented development workflows (Cursor + Claude Code), real-time analytics dashboards, and hybrid mobile apps using Rails JSON API with React Native. Led technical design and execution across multi-tenant Rails backends, performance optimization, CI/CD, and AI-assisted debugging to reduce ramp-up and issue resolution time substantially. Strong across Rails, React/React Native, SQL databases, AWS, Docker, and modern testing/quality practices.…Senior Full Stack Engineer who engineered migrations from monolithic Rails systems to service-oriented architectures, extracting payment processing and notification services to support 50K+ transactions/day with 99.95% uptime. Experienced with AI-augmented development workflows (Cursor + Claude Code), real-time analytics dashboards, and hybrid mobile apps using Rails JSON API with React Native. Led technical design and execution across multi-tenant Rails backends, performance optimization, CI/CD, and AI-assisted debugging to reduce ramp-up and issue resolution time substantially. Strong across Rails, React/React Native, SQL databases, AWS, Docker, and modern testing/quality practices.

Lei Wei Senio r

Full Stack Developer, Back-End Developer, Software Engineer, +1

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Senior Full Stack Engineer who engineered migrations from monolithic Rails systems to service-oriented architectures, extracting payment processing and notification services to support 50K+ transactions/day with 99.95% uptime. Experienced with AI-augmented development workflows (Cursor + Claude Code), real-time analytics dashboards, and hybrid mobile apps using Rails JSON API with React Native. Led technical design and execution across multi-tenant Rails backends, performance optimization, CI/CD, and AI-assisted debugging to reduce ramp-up and issue resolution time substantially. Strong across Rails, React/React Native, SQL databases, AWS, Docker, and modern testing/quality practices.…Senior Full Stack Engineer who engineered migrations from monolithic Rails systems to service-oriented architectures, extracting payment processing and notification services to support 50K+ transactions/day with 99.95% uptime. Experienced with AI-augmented development workflows (Cursor + Claude Code), real-time analytics dashboards, and hybrid mobile apps using Rails JSON API with React Native. Led technical design and execution across multi-tenant Rails backends, performance optimization, CI/CD, and AI-assisted debugging to reduce ramp-up and issue resolution time substantially. Strong across Rails, React/React Native, SQL databases, AWS, Docker, and modern testing/quality practices.

Available to hire

Senior Full Stack Engineer who engineered migrations from monolithic Rails systems to service-oriented architectures, extracting payment processing and notification services to support 50K+ transactions/day with 99.95% uptime. Experienced with AI-augmented development workflows (Cursor + Claude Code), real-time analytics dashboards, and hybrid mobile apps using Rails JSON API with React Native.

Led technical design and execution across multi-tenant Rails backends, performance optimization, CI/CD, and AI-assisted debugging to reduce ramp-up and issue resolution time substantially. Strong across Rails, React/React Native, SQL databases, AWS, Docker, and modern testing/quality practices.

Skills

Experience Level

Expert

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Language

English

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Work Experience

Senior Full Stack Engineer

January 1, 2023 - Present

Engineered migration of a monolithic Rails application to a service-oriented architecture, extracting payment processing and notifications services handling 50K transactions/day with 99.95% uptime. Implemented AI-augmented development workflow using Cursor with custom rule sets, reducing boilerplate code generation time by 65% while maintaining code quality standards across multiple engineering teams. Built real-time analytics dashboards using Rails 7 Hotwire and PostgreSQL materialized views, processing 2M+ events daily and reducing dashboard load times from ~8s to ~400ms. Architected a hybrid mobile application using Rails JSON API with React Native, serving 500K+ users with offline sync and push notification capabilities. Established AI prompt/document standards company-wide to reduce AI anti-patterns by 80% via validation and code review checkpoints. Led rewrites/migrations of legacy PHP e-commerce to Rails 7 with Hotwire, improving performance (Core Web Vitals). Built AI-assisted

Senior Full Stack Engineer at Hayes, UK (Remote)

January 1, 2023 - Present

Engineered migration of a monolithic Rails 6 application to a service-oriented architecture, extracting payment processing and notification services handling 50K transactions/day with 99.95% uptime. Implemented AI-augmented development workflow using Cursor with custom rule sets, reducing boilerplate generation time by 65% while maintaining code quality across a multi-engineering team. Developed real-time analytics dashboards using Rails 7 Hotwire and PostgreSQL materialized views, processing 2M+ events daily and reducing dashboard load times from 800ms to 400ms. Architected a hybrid mobile application using Rails JSON API with React Native, supporting 500K+ users with offline synchronization and push notification capabilities. Established company-wide AI prompting standards and validation/code review checkpoints, reducing AI anti-patterns by 80%. Led rewrites of legacy PHP e-commerce platform to Rails 7 with Hotwire, reducing page load times by 3.2s and improving Core Web Vitals score

Senior Full Stack Engineer at Hayes, UK

January 1, 2023 - Present

Engineered migration of a monolithic Rails application to a service-oriented architecture, extracting payment processing and notifications services handling ~50K transactions/day with 99.95% uptime. Implemented AI-augmented development workflow using Cursor with custom rule sets to reduce boilerplate generation time by ~65% while maintaining code quality standards across teams. Developed real-time analytics dashboards using Rails 7 Hotwire and PostgreSQL materialized views, processing 2M+ events daily and reducing dashboard load times from ~800ms to ~400ms. Architected a hybrid mobile app using Rails JSON API with React Native, supporting 500K+ users with offline-first synchronization and push notification capabilities. Established AI-prompting/documentation standards company-wide to reduce anti-patterns in AI-generated code by ~80% through systematic validation and code-review checkpoints. Led modernization of a legacy PHP e-commerce platform to Rails 7 using Hotwire, improving page

Full Stack Developer at WeDamn

January 1, 2022 - January 1, 2023

Built a custom Rails admin platform for 1,000+ Shopify stores, implementing GraphQL API integration with Rails and a React frontend to process 10K+ orders daily. Developed AI-powered code review systems using GitHub webhooks and OpenAI API, automatically flagging 150+ potential security vulnerabilities and performance anti-patterns. Engineered real-time inventory synchronization between Rails backend and Shopify API using Sidekiq and Redis, reducing stock discrepancies from 5% to 0.2%. Implemented CI/CD pipelines with Docker and GitHub Actions, using AI-generated test optimization to reduce build times from 45 minutes to 12 minutes.

Full Stack Developer at WeDamnSureShopify Agency

January 1, 2022 - January 1, 2023

Built a custom Rails admin platform for 1,000+ Shopify stores with GraphQL API integration (Rails + React frontend) processing 10K+ orders daily. Developed AI-powered code review systems using GitHub webhooks and the OpenAI API to automatically flag 150+ potential security vulnerabilities and performance anti-patterns. Engineered real-time inventory synchronization between Rails backend and Shopify API using Sidekiq and Redis, reducing stock discrepancies from 5% to 0.2%. Implemented CI/CD pipelines with Docker and GitHub Actions, using AI-generated test optimization to reduce build times from 45 minutes to 12 minutes.

Full Stack Developer at WeDamnSure Shopify Agency

January 1, 2022 - December 31, 2022

Built a custom Rails admin platform for 1,000+ Shopify stores with GraphQL API integration processing 10K+ orders daily. Developed AI-powered code review systems using GitHub webhooks and OpenAI API to automatically flag 150+ potential security vulnerabilities and performance anti-patterns. Engineered real-time inventory synchronization between Rails backend and Shopify API using Sidekiq and Redis, reducing stock discrepancies from 5% to 0.2%. Implemented CI/CD pipelines with Docker and GitHub Actions, using AI-generated test optimization to reduce build times from 45 minutes to 12 minutes.

Software Engineer at MaaMary Worldwide

January 1, 2021 - January 1, 2022

Developed a healthcare portal using Rails 6 with React frontend, serving 200K+ patients with HIPAA-compliant data encryption and audit logging. Built a prescription management system with Rails backend and React Native mobile app, implementing offline-first synchronization for rural healthcare providers. Migrated a monolithic application to a modular Rails engineering architecture, extracting patient records and billing into separate services with well-defined APIs. Established comprehensive test suites using RSpec and Capybara, using AI-assisted test generation to achieve 94% code coverage across critical patient-data workflows.

Software Engineer at MamMary Worldwide

January 1, 2018 - December 31, 2021

Developed a healthcare portal using Rails 6 with React frontend, serving 200K+ patients with HIPAA-compliant data encryption and audit logging. Built a prescription management system with Rails backend and React Native mobile app, implementing offline-first synchronization for rural healthcare providers. Migrated a monolithic application to a modular Rails engine architecture, extracting patient records and billing into separate services with well-defined APIs. Established comprehensive test suites using RSpec and Capybara, using AI-assisted test generation to reach ~94% code coverage across critical patient data workflows.