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Jelena Korac

@jelenakorac

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Front-end developer focused on React, performance optimization, and product-driven UX.

Portugal

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What I'm looking for

I’m looking for a product-focused role where I can own front-end features end-to-end, improve UX and performance, and contribute to growth in a fast-moving, collaborative team.

I am a front-end developer with 6+ years building scalable web applications, specializing in React, TypeScript, performance optimization, and product-driven UI architecture. I own features end-to-end, from concept and design collaboration to production deployment, with a strong focus on UX clarity, conversion, and user retention.

Recently I founded and engineered Syncira, a FemTech SaaS platform, implementing authentication flows, Supabase integration, AI-supported feature architecture, dynamic data visualizations, and production deployment. Previously I led UI and performance improvements at Lcb.org, increasing engagement and reducing load times through reusable components, responsive strategy, SEO and accessibility work.

Experience

Work history, roles, and key accomplishments

Current

Founder & Product Engineer

Current

Syncira.app

Oct 2025 - Present (5 months)

Designed and developed a cycle-intelligence SaaS using React, TypeScript and Supabase; implemented authentication, AI-assisted insights, dynamic cycle calculations and optimized onboarding to improve conversion and retention.

React TypeScript Supabase Data Modeling AI Feature Architecture Deployment

Front-end Developer

Lcb.org

Oct 2019 - Sep 2025 (5 years 11 months)

Developed and maintained high-traffic Symfony-based web applications, led UI and performance optimizations that increased engagement by 25% and reduced load times by 40%, and improved mobile engagement by 60%.