Hello, I'mMarcin Piniarski
Senior Frontend Engineer building complex UI systems — from visual CMS editors and AI-powered interfaces to data-heavy dashboards. Specializing in frontend architecture, design systems, and performance at scale.
Led frontend development across multiple products, introducing design systems, engineering standards, and performance improvements.
9+ years of experience working with companies worldwide
Led frontend development and introduced design systems across global teams in finance, e-commerce, and enterprise software.
View My Experience
Case studies
Concrete problems from recent roles — what was hard, what I built, and what changed.
Building a true WYSIWYG editor on top of a live webpage
WebSight CMS
Enabling true visual editing on top of a real rendered page using an overlay-based architecture.
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Scaling UI consistency across a multi-application platform
Siemens (GroundFog)
Unifying UI across teams with a shared design system and visual regression testing.
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Bridging legacy and modern UI flows
OLX Group
Connecting legacy and modern applications to enable seamless cross-application flows.
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Quick Overview
Key qualifications and expertise
Education
MSc in Computer Science - Distributed Systems
Full-Stack Development
9+ years, frontend-focused with backend expertise
Core Technologies
Main Expertise
Want to know more about my background, skills, and what I can bring to your team? Check out my detailed profile.
Learn More About MeServices I Provide
Leveraging 9+ years of experience to help organizations build exceptional frontend experiences
Web Projects Delivery
End-to-end web project delivery from initial design to production deployment, ensuring quality and performance at every stage.
Software Engineering Management
Leading engineering teams with focus on delivery, code quality, and best practices. Establishing workflows and development processes that scale.
Leading a Frontend Team
Building and mentoring high-performing frontend teams. Fostering technical excellence and collaborative culture across distributed teams.
Architectural Advisory
Providing strategic guidance on frontend architecture, design systems, and technical decisions for scalable enterprise applications.
Explore More
Learn more about my experience, projects, and background
Contact Information
Location
Warsaw, Poland (Remote available)