Alexander Liu
Alexander Liu

Senior Software Engineer

Actively looking · Member since 2 Jun 2025
Message
Location
Ireland
Desired salary
from 35 USD/hourly
Work preference
Full Time
Experience level
Not set

About

Professional summary

Senior Software Engineer with 10+ years of experience in designing, building, and optimizing performant, scalable web platforms. Experienced across Java, Spring Boot, React, Next.js, and cloud-native microservices. Proven success in reducing infrastructure costs by 35%, increasing customer
retention by 87%, and leading platform migrations and security enhancements. Passionate about maintainable architecture, developer experience, and solving hard business problems with elegant systems.

Skills

11 capabilities

Experience

Career history

Senior Software Engineer Tyk

- Led the design, development, and optimization of scalable web applications using React.js, Next.js, Node.js, and Django, ensuring seamless performance for over one million users.
- Revamped CI/CD pipelines using GitHub Actions, Travis, and Docker reducing deployment times by 80% and tripling release frequency while maintaining 99.9% uptime.
- Integrated Java-based microservices (Spring Boot) for internal tooling and auth APIs, aligning backend consistency across multiple services.
- Maintained and extended legacy Java modules handling SSO and permissioning logic, helping unify access management with newer Node.js services.
- Architected and implemented a microservices infrastructure, enhancing modularity and code reusability, accelerating feature rollouts by 35%, and reducing system downtime by 25%.
- Conducted over 500 code reviews, enforced best coding practices, and introduced test-driven development, increasing team productivity by 40%.
- Collaborated with product and design teams to enhance UI/UX, leading to a 50% increase in user engagement and a 30% decrease in bounce rates.
- Developed and deployed cost-efficient serverless solutions on AWS, reducing infrastructure costs by 35% while improving system reliability and response times.
- Diagnosed and resolved critical system issues, ensuring minimal downtime and enhancing platform stability.
- Integrated security best practices, including secure authentication, data encryption, and compliance measures.
- Mentored junior engineers, fostering technical growth and a culture of collaboration.
- Engaged in cross-functional strategy discussions to align engineering efforts with key business goals.

Senior Full-Stack Developer NetWatch Global

- Engineered and deployed scalable systems for a high-traffic e-commerce platform, optimizing API performance by 30% with a microservices architecture using Node.js, Express, and AWS Lambda.
- Led the front-end modernization initiative by migrating to React and Redux, decreasing load times by 25% and improving user engagement.
- Collaborated on migrating backend reporting tools from Python to Java + Spring Boot, enabling faster batch processing and better maintainability.
- Developed an advanced caching mechanism using Redis and PostgreSQL, reducing query latency by 40% and improving real-time analytics capabilities.
- Enhanced cloud infrastructure reliability with AWS, integrating Docker and Jenkins into CI/CD workflows to enable zero-downtime deployments.
- Provided mentorship to junior developers, fostering knowledge-sharing and collaboration while working closely with product and design teams to accelerate feature delivery by 20%.

Full-Stack Developer Capventis

- Designed and maintained mission-critical web applications using Python (Django, Flask) and JavaScript, ensuring 99.9% uptime and reducing response times by 50%.
- Implemented a scalable microservices architecture, decreasing operational overhead by 40% and reducing deployment failures by 35%.
- Optimized application performance by fine-tuning database queries and implementing advanced caching strategies, bringing the average load time down from 4s to 1.5s.
- Developed 15+ RESTful APIs, streamlining communication between internal and external services and improving data flow efficiency by 45%.
- Collaborated with Java backend teams (Spring Boot and Kotlin) to define API contracts and error handling, improving end-to-end reliability.
- Built an AI-powered fraud detection tool, using machine learning to analyze large datasets and successfully reduce fraudulent transactions by 70%.

Frontend Developer Cesanta

- Worked on building responsive, high-performance web applications, helping improve page load speed by 50% and mobile responsiveness by 80%. Collaborated with senior developers to refine the user experience and optimize frontend performance across all devices.
- Helped migrate legacy frontend systems to modern frameworks like React and TypeScript, making the application more stable and easier to maintain. This reduced bug reports by 35%.
- Assisted in migrating a React component library to TypeScript, improving code maintainability and reducing runtime errors by 30%.
- Developed over 30 reusable UI components, enhancing development efficiency and reducing frontend build time by 40%.
- Collaborated with designers and developers to ensure smooth communication and alignment on project goals, leading to a 25% faster delivery time.
- Helped implement automated testing frameworks, reducing frontend bugs by 45% and increasing code coverage by 60%.
- Contributed to a company-wide accessibility initiative, supporting WCAG compliance efforts and helping expand user reach by 20%.

Education

Learning history

Trinity College Dublin

Bachelor's degree of Computer Science

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