Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I am a driven Full-Stack Engineer with 3+ years of experience building scalable web systems using JavaScript, TypeScript, React, Next.js, Node.js, and NestJS. I enjoy designing efficient data processing and performance-focused features that directly improve user experience. In my work, I focus on system design, clean architecture, and reliable delivery. I’ve shipped microservices with CI/CD automation, built user-facing tools like job/application trackers, and optimized database and frontend performance for measurable results.…I am a driven Full-Stack Engineer with 3+ years of experience building scalable web systems using JavaScript, TypeScript, React, Next.js, Node.js, and NestJS. I enjoy designing efficient data processing and performance-focused features that directly improve user experience. In my work, I focus on system design, clean architecture, and reliable delivery. I’ve shipped microservices with CI/CD automation, built user-facing tools like job/application trackers, and optimized database and frontend performance for measurable results.

Mykyta Oliinyk

Full Stack Developer, Web Developer, Software Engineer, +2





I am a driven Full-Stack Engineer with 3+ years of experience building scalable web systems using JavaScript, TypeScript, React, Next.js, Node.js, and NestJS. I enjoy designing efficient data processing and performance-focused features that directly improve user experience. In my work, I focus on system design, clean architecture, and reliable delivery. I’ve shipped microservices with CI/CD automation, built user-facing tools like job/application trackers, and optimized database and frontend performance for measurable results.…I am a driven Full-Stack Engineer with 3+ years of experience building scalable web systems using JavaScript, TypeScript, React, Next.js, Node.js, and NestJS. I enjoy designing efficient data processing and performance-focused features that directly improve user experience. In my work, I focus on system design, clean architecture, and reliable delivery. I’ve shipped microservices with CI/CD automation, built user-facing tools like job/application trackers, and optimized database and frontend performance for measurable results.

Available to hire

I am a driven Full-Stack Engineer with 3+ years of experience building scalable web systems using JavaScript, TypeScript, React, Next.js, Node.js, and NestJS. I enjoy designing efficient data processing and performance-focused features that directly improve user experience.

In my work, I focus on system design, clean architecture, and reliable delivery. I’ve shipped microservices with CI/CD automation, built user-facing tools like job/application trackers, and optimized database and frontend performance for measurable results.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

Polish

Advanced

English

Advanced

Ukrainian

Fluent

Work Experience

Full-Stack Engineer at OneTap.Work

January 1, 2025 - Present

Enabled storage and processing of 500M+ records without horizontal scaling by engineering a custom memory-efficient PostgreSQL algorithm, achieving a 65x memory reduction. Built an application tracker to add, track, and filter job applications in one place instead of multiple job boards. Shipped 5+ microservices with full CI/CD automation, reducing deployment time by 60% and enabling zero-downtime releases.

Full-Stack Developer at Examix

January 1, 2024 - January 1, 2025

Introduced a template-based test builder, reducing the time to create a new test from 20 to 5 minutes and improving reuse across schools. Cut load time of the interactive test constructor by 35% using React component code-splitting and lazy loading. Reduced write latency in the test grading engine by 50% through asynchronous batch processing and SQL query refactoring.

Front-End Developer at Freelancer

January 1, 2023 - January 1, 2024

Developed 10+ applications using React and Redux, strengthening state management and common frontend case handling. Created 10+ landing pages using HTML, SCSS, and JavaScript to build optimized, semantically correct layouts. Improved code quality through strict code reviews with mentors, focusing on clean, readable, maintainable frontend code.