Since 2013, I’ve been helping businesses and startups worldwide build high-quality WordPress, React, and AI solutions. I bring proven expertise and results-driven development to every collaboration. I specialize in scalable web solutions, AI engineering, and workflow automation using tools like n8n, Make.com, and Zapier, helping companies streamline processes, reduce costs, and accelerate growth. My Expertise • WordPress Development – custom themes (Figma, XD, PSD), bespoke plugins, WooCommerce, Gravity Forms, Formidable, Yoast • E-Commerce – WooCommerce, Shopify theme development • Frontend Development – React.js, modern UI/UX, pixel-perfect designs • Backend Development – Node.js, scalable APIs • AI Engineering – ChatGPT, OpenAI, DALL-E, TensorFlow, PyTorch, NLP, Machine Learning, Forecasting • Cloud & DevOps (AWS) – EC2, S3, RDS, Lambda, CloudFront, Amplify, API Gateway • Hosting and scaling WordPress websites on AWS • Serverless applications with AWS Lambda • Secure API development with API Gateway • AI/ML model deployment using AWS infrastructure • Cost-optimized cloud architecture for startups & enterprises • Automation & Integrations – n8n, Make.com (Integromat), Zapier • Automating workflows between apps and CRMs • Connecting e-commerce (Shopify/WooCommerce) with external services • AI + automation pipelines (e.g., ChatGPT + Zapier/Make for business processes) Why work with me? • Full-time freelancer – dedicated, reliable, and always delivering on time • Quality-focused – clean code, scalable solutions, and tailored approaches for each client • Client experience – I’ve worked with startups, agencies, and enterprises worldwide, adapting to diverse business needs Whether you need a reliable partner for a long-term project or a fast turnaround for a specific task, I bring the skills, experience, and proven results to help your business succeed. Let’s build something exceptional together.

Cezary Siwa

5.0 (1 review)

Since 2013, I’ve been helping businesses and startups worldwide build high-quality WordPress, React, and AI solutions. I bring proven expertise and results-driven development to every collaboration. I specialize in scalable web solutions, AI engineering, and workflow automation using tools like n8n, Make.com, and Zapier, helping companies streamline processes, reduce costs, and accelerate growth. My Expertise • WordPress Development – custom themes (Figma, XD, PSD), bespoke plugins, WooCommerce, Gravity Forms, Formidable, Yoast • E-Commerce – WooCommerce, Shopify theme development • Frontend Development – React.js, modern UI/UX, pixel-perfect designs • Backend Development – Node.js, scalable APIs • AI Engineering – ChatGPT, OpenAI, DALL-E, TensorFlow, PyTorch, NLP, Machine Learning, Forecasting • Cloud & DevOps (AWS) – EC2, S3, RDS, Lambda, CloudFront, Amplify, API Gateway • Hosting and scaling WordPress websites on AWS • Serverless applications with AWS Lambda • Secure API development with API Gateway • AI/ML model deployment using AWS infrastructure • Cost-optimized cloud architecture for startups & enterprises • Automation & Integrations – n8n, Make.com (Integromat), Zapier • Automating workflows between apps and CRMs • Connecting e-commerce (Shopify/WooCommerce) with external services • AI + automation pipelines (e.g., ChatGPT + Zapier/Make for business processes) Why work with me? • Full-time freelancer – dedicated, reliable, and always delivering on time • Quality-focused – clean code, scalable solutions, and tailored approaches for each client • Client experience – I’ve worked with startups, agencies, and enterprises worldwide, adapting to diverse business needs Whether you need a reliable partner for a long-term project or a fast turnaround for a specific task, I bring the skills, experience, and proven results to help your business succeed. Let’s build something exceptional together.

Available to hire

Since 2013, I’ve been helping businesses and startups worldwide build high-quality WordPress, React, and AI solutions. I bring proven expertise and results-driven development to every collaboration.

I specialize in scalable web solutions, AI engineering, and workflow automation using tools like n8n, Make.com, and Zapier, helping companies streamline processes, reduce costs, and accelerate growth.

My Expertise
• WordPress Development – custom themes (Figma, XD, PSD), bespoke plugins, WooCommerce, Gravity Forms, Formidable, Yoast
• E-Commerce – WooCommerce, Shopify theme development
• Frontend Development – React.js, modern UI/UX, pixel-perfect designs
• Backend Development – Node.js, scalable APIs
• AI Engineering – ChatGPT, OpenAI, DALL-E, TensorFlow, PyTorch, NLP, Machine Learning, Forecasting
• Cloud & DevOps (AWS) – EC2, S3, RDS, Lambda, CloudFront, Amplify, API Gateway
• Hosting and scaling WordPress websites on AWS
• Serverless applications with AWS Lambda
• Secure API development with API Gateway
• AI/ML model deployment using AWS infrastructure
• Cost-optimized cloud architecture for startups & enterprises
• Automation & Integrations – n8n, Make.com (Integromat), Zapier
• Automating workflows between apps and CRMs
• Connecting e-commerce (Shopify/WooCommerce) with external services
• AI + automation pipelines (e.g., ChatGPT + Zapier/Make for business processes)

Why work with me?
• Full-time freelancer – dedicated, reliable, and always delivering on time
• Quality-focused – clean code, scalable solutions, and tailored approaches for each client
• Client experience – I’ve worked with startups, agencies, and enterprises worldwide, adapting to diverse business needs

Whether you need a reliable partner for a long-term project or a fast turnaround for a specific task, I bring the skills, experience, and proven results to help your business succeed. Let’s build something exceptional together.

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Experience Level

Expert
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Expert
Intermediate
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Language

English
Advanced
Polish
Fluent

Work Experience

Freelance Web Developer at UpWork
March 17, 2013 - Present
Since March 2013, I’ve been working full-time as a freelance web developer, specializing in PHP and WordPress. On Upwork, I’ve successfully completed over 1,000 projects, earning more than $1 million in total.

Education

Bachelors of Computer Science at Nicolaus Copernicus University
October 1, 2006 - September 30, 2010

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Computers & Electronics

Experience Level

Expert
Expert
Expert
Expert
Expert
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Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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