Karas Merliny

Available to hire

I am a Full-Stack Web Developer with 3+ years of experience building scalable, high-performance web applications for remote and freelance clients.

About

I am a Full-Stack Web Developer with 3+ years of experience building scalable, high-performance web applications for remote and freelance clients. I specialize in JavaScript and modern frameworks including React, Angular, Vue, Node.js, and Laravel, with strong backend experience in Python and Django.

I have a solid foundation in software engineering principles, backed by a Bachelor’s degree in Software Engineering from The University of Hong Kong. My work includes developing RESTful APIs, SaaS platforms, MERN stack applications, authentication systems, and responsive user interfaces. I enjoy working closely with clients to translate business requirements into reliable technical solutions.

Passionate about startups, clean architecture, and continuous learning, I focus on writing maintainable code, optimizing performance, and delivering production-ready systems that scale. I thrive in remote, agile environments and enjoy collaborating across teams to build impactful digital products.

  • Joined January 2026

Languages

  • EnglishAdvanced
  • UkrainianFluent
  • ChineseFluent

Industry experience

  • Software & Internet

More experts in Hong Kong, Hong Kong

Projects · 1

I built a Moniwave dashboard web application for a startup client using React, Node.js, and MongoDB.

Key Features:
User authentication & role management
Real-time data dashboard
REST API backend
Mobile-responsive UI
Secure payment integration
Admin panel
Technologies Used:
React, Node.js, Express, MongoDB, JWT, Stripe API, Tailwind CSS

Result:
Page speed improved: 30%–50%
Active users: 500–2,000
Server response reduced: 60%
Conversion increase: 20%
Uptime: 99.9%

Moniwave Dashboard Web App (React + Node.js)
  • Back-End Developer
  • Database Developer
  • Front-End Developer

Work experience· 4 roles

Senior Full Stack Developer · Tech Solutions Inc.Jan 2023 – Present · 3 yrs 11 mos

Led a team of 4 developers to build a scalable SaaS platform using React, Node.js, and AWS, serving 50,000 monthly users. Reduced API response time by 60% by optimizing MongoDB queries and implementing Redis caching. Migrated legacy monolithic backend to microservices architecture, improving deployment efficiency by 40%. Mentored junior developers, conducted code reviews, and introduced Agile/Scrum practices.

Full-Stack Web Developer · Freelance / Remote ClientsOct 2022 – Present · 4 yrs 2 mos

Freelance full-stack developer delivering scalable web applications for remote clients. Experienced with React, Node.js, Laravel, Python and MERN stack; built REST APIs, SaaS platforms, and responsive UIs; deployed on cloud servers and maintained production systems. Strong in collaboration with startups and cross-functional teams.

Full Stack Developer · Innovate Apps (Startup)Feb 2022 – Dec 2022 · 11 mos

Developed a customer analytics dashboard using React and D3.js, increasing client retention by 25%. Designed RESTful APIs with Express.js for a mobile app, handling 10,000 concurrent requests with Firebase integration. Automated CI/CD pipelines using Docker and GitHub Actions, reducing deployment time by 70%.

Full Stack Developer · Digital Craft StudiosOct 2021 – Jan 2022 · 4 mos

Education

Bachelor of Engineering in Software Engineering · The University of Hong Kong2030 – 2026
Master of Science in Computer Science · University of Toronto2017 – 2021

Certifications and awards

Full-Stack Web Development Professional2023 – 2026
React Developer Certification2023 – 2026
Python for Web Development2022 – 2026

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