Jedrzej Siewierski – Senior Backend Software Engineer & Web Development

Providing Efficient Web Development & Building Scalable Web Apps with Node.js

I am an experienced Software Engineer specializing in backend web development with a strong focus on scalable architectures, API integrations, and cloud-based solutions. My expertise lies in building high-performance applications using Node.js, designing microservices, and optimizing databases for efficiency and scalability.

My Services

🚀 Empowering Businesses with Scalable Web Application, Automations and Solutions

I specialize in building custom ERP, CRM, automation, and e-commerce platforms—not just simple websites. Whether you need a experienced Software Engineer, technical consultant or are you looking a mentor for web development, I’m here to help you.

Creating Custom Web Applications

ERP, CRM, E-commerce & more automation solutions to optimize your business operations.

Software Consulting

Expert guidance on backend architecture, scalability, and API design.

Learn Code - Mentorship & Training

1-on-1 mentoring for junior developers learning Node.js & web development.

frequently asked questions

Explore our collection of frequently asked questions for helpful insights.

What’s the difference between a website and a web application?

A website is typically static, providing information like a digital brochure (e.g., WordPress pages). A web application, on the other hand, is interactive—it allows users to perform tasks, manage data, and integrate with external services. If you need custom logic, authentication, and advanced backend functionalities, you need a web application, not just a website.

When should I choose a custom web application instead of WordPress?

✅ If you need a simple blog or a marketing website → WordPress is fine
✅ If you need user accounts, complex workflows, API integrations, or automation → You need a custom-built web application using Node.js, NestJS, or Next.js

How much does it cost to build a custom web application?

The cost depends on the complexity of the app, required features, and integrations. A basic MVP (Minimum Viable Product) can start from $5,000-$15,000, while enterprise-grade applications with cloud infrastructure and security can go beyond $50,000+.

How long does it take to develop a web application?

The timeline depends on the project scope:
⏳ Simple apps (MVPs): 4-8 weeks
📊 Medium complexity apps: 3-6 months
🏢 Enterprise-grade apps: 6+ months

I use Agile methodologies to deliver working versions quickly, so you can start seeing results early.

Which technologies do you use?

I specialize in modern backend and full-stack development, including:

Backend: Node.js, NestJS, Express.js
Frontend: React.js, Next.js
Databases: PostgreSQL, MongoDB, Redis
Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD

Can you scale my existing web application?

Yes! If your current app is slow, unscalable, or outdated, I can optimize it, migrate to microservices, and implement caching solutions using Redis, AWS Lambda, and Kubernetes.

What is your process for developing a new application?

My 5-step development process ensures success:
1️⃣ Consultation & Planning – Understanding your business goals
2️⃣ Architecture & Design – Defining the tech stack & user experience
3️⃣ Development – Writing clean, scalable code
4️⃣ Testing & Deployment – Ensuring security & performance
5️⃣ Ongoing Support – Helping you scale & maintain the app

Can you migrate my existing application to a better technology?

Yes! If your app is outdated or built on an inefficient stack, I can migrate it to a modern architecture using Node.js, cloud services, and containerized environments.

Do you work with startups and small businesses?

Absolutely! I help startups build MVPs quickly and cost-effectively and assist small businesses in automating and scaling their operations.

How can I get started?

📩 Let’s talk! Contact me via:

Email: jedrzej.siewierski@gmail.com
LinkedIn: linkedin.com/in/jedrzej-siewierski
GitHub: github.com/EnDriash