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I'm Vladyslav Sevastian, a frontend developer with over 4 years of professional experience delivering mobile and web applications across Fintech, Logistics, AI-driven SaaS, and Enterprise Automation industries. I translate complex requirements into fast, stable, and scalable products that drive efficiency, user growth, and innovation. I specialize in React and React Native, TailwindCSS, and modern AI stacks (LangChain, HuggingFace, Flask). I design clean architectures, implement automations, and collaborate with product and research teams to ship production-ready features and AI prototypes, improving performance and reducing costs.…I'm Vladyslav Sevastian, a frontend developer with over 4 years of professional experience delivering mobile and web applications across Fintech, Logistics, AI-driven SaaS, and Enterprise Automation industries. I translate complex requirements into fast, stable, and scalable products that drive efficiency, user growth, and innovation. I specialize in React and React Native, TailwindCSS, and modern AI stacks (LangChain, HuggingFace, Flask). I design clean architectures, implement automations, and collaborate with product and research teams to ship production-ready features and AI prototypes, improving performance and reducing costs.

Vladyslav Sevastian

Front-End Developer, Web Developer, Full Stack Developer, +2

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I'm Vladyslav Sevastian, a frontend developer with over 4 years of professional experience delivering mobile and web applications across Fintech, Logistics, AI-driven SaaS, and Enterprise Automation industries. I translate complex requirements into fast, stable, and scalable products that drive efficiency, user growth, and innovation. I specialize in React and React Native, TailwindCSS, and modern AI stacks (LangChain, HuggingFace, Flask). I design clean architectures, implement automations, and collaborate with product and research teams to ship production-ready features and AI prototypes, improving performance and reducing costs.…I'm Vladyslav Sevastian, a frontend developer with over 4 years of professional experience delivering mobile and web applications across Fintech, Logistics, AI-driven SaaS, and Enterprise Automation industries. I translate complex requirements into fast, stable, and scalable products that drive efficiency, user growth, and innovation. I specialize in React and React Native, TailwindCSS, and modern AI stacks (LangChain, HuggingFace, Flask). I design clean architectures, implement automations, and collaborate with product and research teams to ship production-ready features and AI prototypes, improving performance and reducing costs.

Available to hire

I’m Vladyslav Sevastian, a frontend developer with over 4 years of professional experience delivering mobile and web applications across Fintech, Logistics, AI-driven SaaS, and Enterprise Automation industries. I translate complex requirements into fast, stable, and scalable products that drive efficiency, user growth, and innovation.

I specialize in React and React Native, TailwindCSS, and modern AI stacks (LangChain, HuggingFace, Flask). I design clean architectures, implement automations, and collaborate with product and research teams to ship production-ready features and AI prototypes, improving performance and reducing costs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Ukrainian

Fluent

English

Advanced

Slovak

Advanced

German

Beginner

Work Experience

Front End Developer at GRUN Software

January 1, 2024 - Present

Delivered and maintained AI-driven SaaS platforms and internal tools for healthcare and insurance clients. Built modular RA(G)-based applications integrating document search, chatbots, and automation workflows, boosting operational throughput by 68.7%. Implemented multi-tenant authentication, vector search, and token streaming, reducing latency and infrastructure costs by 32.4%. Collaborated with product and research teams to ship AI prototypes (e.g., Medlab 2025 chatbot) within 1 month, generating 3+ enterprise leads. Improved backend scalability and accuracy for insurance AI modules, reducing policy processing time from 2 hours to 15 minutes.

Front End Developer at Miteyda

January 1, 2022 - January 1, 2024

Delivered production-ready mobile and web applications for logistics, e-commerce, and construction sectors. Built reliable cross-platform workflows, API integrations, and state management, improving operational efficiency by 37.3%. Implemented multilingual and offline capabilities, increasing accessibility and user retention across platforms. Partnered with business stakeholders to define requirements and deliver MVPs within 1–3 months, enabling faster go-to-market and measurable ROI. Optimized performance and UX across projects, reducing load times by up to 40% and improving mobile stability by 31.2%.