![Alexander Liu](https://jobicy.com/react/themes/app/images/avatar.jpg) Alexander Liu # Senior Software Engineer Actively looking · Member since 2 Jun 2025 [Message](https://jobicy.com/dashboard-page.md) ShareLocationIrelandDesired salaryfrom 35 USD/hourlyWork preferenceFull TimeExperience levelNot set * [Overview](#overview) * [Portfolio 0](#portfolio) * [Services 0](#services) ## About Professional summarySenior 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[AngularJS](https://jobicy.com/talent/angularjs.md)[AWS S3](https://jobicy.com/talent/aws-s3.md)[Cypress](https://jobicy.com/talent/cypress.md)[Django](https://jobicy.com/talent/django.md)[Git](https://jobicy.com/talent/git.md)[Java](https://jobicy.com/talent/java.md)[Kotlin](https://jobicy.com/talent/kotlin.md)[Laravel](https://jobicy.com/talent/laravel.md)[PHP](https://jobicy.com/talent/php.md)[Redux](https://jobicy.com/talent/redux.md)[Vue.Js](https://jobicy.com/talent/vue-js.md) ## Experience Career history ### Senior Software Engineer · Tyk 03/2023 – 04/2025- 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 03/2020 – 02/2023- 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 10/2017 – 02/2020- 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 02/2013 – 09/2017- 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 2009.09 – 2013-06Bachelor's degree of Computer Science This professional hasn’t added portfolio projects yet. This professional hasn’t listed any services yet.