Daniel User
@danielileiko
I build scalable full-stack web products with React, Node.js, TypeScript, and AWS.
PolandWhat I'm looking for
I've spent 5+ years building web products end-to-end across B2B platforms, AdTech, and email automation. I focus on clean architecture, measurable performance improvements, and pixel-perfect interfaces that match design specifications.
I've built a scalable event-tracking SDK, redesigned 10–20 product screens within three months, optimized multi-table SQL queries by an estimated 2–5x, and improved complex authentication and admin workflows. For an AdTech project, I delivered a production email system using Amazon SES and dynamic React-Mail templates, migrated tables from GridJS to AgGrid, and deployed updates on AWS Lambda.
I've also delivered HubSpot and ZeroBounce integrations for high-volume email campaigns, managed SQS queues, created database migrations, and established unit, integration, and E2E coverage with Jest, React Testing Library, and Cypress. Earlier, I progressed from intern to Junior Developer while contributing to a MERN platform for office workspace and massage table booking.
Experience
Work history, roles, and key accomplishments
Full-Stack Engineer
About project
Built a scalable event-tracking layer using a custom SDK and redesigned 10-20 screens of the product frontend within 3 months. Optimized critical multi-table SQL queries, achieving an estimated 2-5x reduction in execution time.
Mentor
About company
Conducted thorough reviews of students' code submissions and provided constructive feedback to improve code quality. Offered consultations to assist students with understanding and completing homework assignments.
Junior Developer
About project
Progressed from intern to Junior Developer within the same team, contributing to an internal MERN-stack platform for office workspace and massage table booking. Collaborated on feature design and implementation.
Education
Degrees, certifications, and relevant coursework
Lviv Polytechnic National University
Bachelor of Cybersecurity, Cybersecurity
2022 -
Pursuing a Bachelor of Cybersecurity degree at Lviv Polytechnic National University.
Technical College
Junior Specialist, Software Engineering
2018 - 2022
Earned a Junior Specialist degree in Software Engineering from Technical College.
Tech stack
Software and tools used professionally
Availability
Location
PolandAuthorized to work in
Social media
Job categories
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