Christopher L.

Software Engineer

Warsaw, Poland

Experience

Apr 2024 - Present
1 year 8 months

Software Engineer

Opencast

  • Designed and implemented scalable Ruby on Rails microservices to handle 10,000+ concurrent users with 99.9% uptime.

  • Developed a cloud-based analytics dashboard integrating PostgreSQL and Redis, reducing data retrieval time by 35%.

  • Spearheaded front-end migration from legacy JS to React.js, enhancing application responsiveness and user retention.

  • Architected RESTful APIs with secure OAuth2 authentication, increasing integration efficiency with third-party services by 40%.

  • Implemented CI/CD pipelines using GitHub Actions, cutting deployment time by 50% and ensuring zero downtime releases.

  • Optimized SQL queries and indexes for high-volume transaction processing, improving database performance by 30%.

  • Led a team of 3 engineers in agile sprints, managing project backlog and delivering features ahead of deadlines.

  • Designed and executed unit and integration tests using RSpec and Capybara, achieving 95% code coverage.

  • Integrated AWS S3 storage for file uploads with automatic image optimization, reducing storage costs by 20%.

  • Developed feature toggle system allowing safe rollouts and A/B testing for critical product features.

  • Collaborated with UX/UI designers to revamp application interface, resulting in a 25% increase in user engagement.

  • Real-time Monitoring Platform: Built a Rails backend with WebSocket integration for live notifications and analytics.

  • Subscription Management System: End-to-end delivery of subscription billing, automated email alerts, and secure payment gateway integration.

Jun 2022 - Mar 2024
1 year 10 months

Full Stack Engineer

VentureCraft

  • Developed full-stack web applications using Ruby on Rails and React.js, serving 50,000+ monthly active users.

  • Implemented PostgreSQL and Redis caching strategies, reducing page load times by 40%.

  • Built GraphQL API endpoints for efficient data fetching and front-end integration.

  • Deployed containerized applications on AWS EC2 with Docker, ensuring environment consistency across dev, staging, and production.

  • Automated deployment pipelines with Jenkins, reducing manual errors and accelerating release cycles.

  • Refactored legacy Rails codebase, improving maintainability and decreasing technical debt by 35%.

  • Designed and executed unit, integration, and E2E tests, achieving high reliability for production releases.

  • Integrated third-party APIs for payment processing, messaging, and geolocation services.

  • Collaborated with cross-functional teams to implement feature-rich e-commerce modules, increasing revenue by 18%.

  • Conducted performance profiling and implemented caching strategies, increasing application throughput by 50%.

  • Mentored junior developers, leading code reviews and knowledge-sharing sessions to promote best practices.

  • E-commerce Platform Revamp: Led full-stack redevelopment including Rails API, React front-end, and PostgreSQL integration.

  • Analytics & Reporting Module: Designed dynamic dashboards and reporting tools for stakeholders, enabling data-driven business decisions.

Apr 2019 - Dec 2021
2 years 9 months

Full Stack Developer

Axeos

  • Developed robust web applications using Ruby on Rails, React.js, and PostgreSQL, supporting enterprise clients.

  • Built modular front-end components and reusable UI libraries to enhance development efficiency.

  • Implemented RESTful APIs and integrated with internal and external systems.

  • Optimized database queries and designed indexing strategies, improving response times by 25%.

  • Collaborated with QA teams to implement automated testing frameworks using RSpec.

  • Maintained CI/CD pipelines for seamless code deployment.

  • Assisted in designing microservices for scalable backend architecture.

  • Refactored legacy applications, reducing maintenance costs and improving code readability.

  • Integrated third-party APIs for payment, geolocation, and email automation.

  • Participated in agile sprint planning and backlog refinement.

  • Inventory Management System: End-to-end delivery of real-time inventory tracking with reporting dashboards.

  • Client Portal: Developed secure Rails-based portal with multi-role access controls and API integrations.

Jan 2017 - Mar 2019
2 years 3 months

Junior Full Stack Developer

Savvycomp

  • Assisted in developing full-stack applications with Ruby on Rails and JavaScript frameworks.
  • Created dynamic web pages and reusable front-end components using HTML, CSS, and jQuery.
  • Built and maintained RESTful APIs for internal and external integrations.
  • Optimized SQL queries for small-to-medium database applications.
  • Participated in code reviews and learned agile development practices.
  • Collaborated with senior developers to implement new modules and features.
  • Assisted in front-end UX improvements based on user feedback.

Summary

Highly skilled Senior Full Stack Engineer with 7+ years of experience designing, developing, and deploying scalable web applications.

Expertise in Ruby on Rails, JavaScript frameworks, PostgreSQL, and cloud-based architecture.

Proven ability to deliver end-to-end solutions, optimize performance, and enhance user experiences.

Adept at leading cross-functional teams, implementing CI/CD pipelines, and driving measurable results through data-driven decision-making.

Languages

English
Advanced
Vietnamese
Intermediate

Education

Oct 2012 - Jun 2016

Ton Duc Thang University

Bachelor of Science · Computer Science · Ho Chi Minh City, Viet Nam

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