09/16/2026 updated

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Full Stack Engineer | React & Next.js Expert | Frontend Specialist

Krakow, Poland
Only remote
Bachelor of Computer Science (BCompSc)
Krakow, Poland
Only remote
Bachelor of Computer Science (BCompSc)

Profile attachments

Frontend_Resume_Filip_Kaczmarek.docx

About me

Performance-driven Frontend Engineer with 7+ years of experience building scalable, responsive web apps. Expert in React, Next.js, TypeScript, and modern state management, delivering production-ready platforms and MVPs fast.

GitHub CopilotGitHub ActionsTailwind CSSBootstrap (Software)DjangoGitHubPython (Programming Language)Next.jsReact.jsFastAPIReact NativeReact Redux
Frontend Architecture & Development
Expertise in building highly scalable, responsive, and user-centric web applications using React.js, Next.js, TypeScript, JavaScript (ES6+), Tailwind CSS, Vite, Flutter, HTML5, and CSS3. Proven track record of launching production-ready platforms and MVPs within weeks.

State & Data Management
Proficiency in Redux, Context API, React Query, RESTful APIs, and GraphQL APIs for robust state and data management in complex enterprise-level applications.

AI & Automation UI Integration
Design and implementation of interfaces for AI Agents, LLM-powered chatbots, RAG-driven analytics dashboards, and LangChain pipelines, enabling seamless interaction with AI-driven decision support systems.

Backend & Cloud Integration
Knowledge of Node.js, FastAPI, PostgreSQL, Supabase, AWS, Azure, and Docker for backend and cloud integration supporting frontend applications.

CI/CD & DevOps Workflows
Application of Git, CI/CD pipelines, Azure DevOps, and Agile/Scrum methodologies to standardize deployment processes and ensure efficient software delivery.

Compliance & Security
Implementation of secure, HIPAA-compliant UI workflows and data handling, including patient data dashboards with real-time analytics and secure API integrations with legacy EMR/EHR systems.

E-Commerce & Payment Integration
Development of e-commerce automation dashboards integrating AI-based inventory forecasting and Stripe payment processing UI components, scaling platforms to significant monthly revenue.

Data Pipeline Visualization
Building of front-facing data analytics interfaces communicating with pipelines processing millions of daily records, optimizing user data interactions.

Experience

Professional experience0 - 5 years
Freelancer since2026

Languages

EnglishFluent

Project history

Senior Software Engineer (Frontend Focus)

Sloan Valve Company
Lead the frontend design, development, and deployment of enterprise-level internal web applications using React, Tailwind CSS, and TypeScript. Designed complex user interfaces for AI-driven decision support systems, built and integrated robust RESTful UI layers for ERP, CRM, and inventory databases, collaborated with cross-border teams to implement CI/CD and security compliance, and optimized database configurations accelerating report generation time by 60%.

Full-Stack & AI Developer

Wizeline
Architected and implemented responsive, cloud-native web applications using React.js for enterprise clients in healthcare, finance, and e-commerce. Led frontend UI integration for AI-powered chatbots and LangChain pipelines, developed HIPAA-compliant patient data dashboards, designed an e-commerce automation dashboard with AI-based inventory forecasting and Stripe payment processing, and shipped MVPs within 4-6 weeks driving a 35-40% increase in product adoption.

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