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Services

We develop websites and apps that do exactly what you need. We specialize in custom web development services, which means that your solution will be tailored to perfectly fit your business.

Technologies

We use mostly open-source technologies, which significantly cuts development costs without compromising on quality and security.

Company

Greenice is a Top Rated web development agency established in 2007.

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Sergii Opanasenko
Sergii Opanasenko - Co-founder and COO at Greenice

Sergii is responsible for establishing and overseeing the main business operations at Greenice. In particular, he supervises web development, QA, project management, HR, and sales. Sergii’s job is to ensure that all puzzle pieces of the business come together to provide the best service to our clients. 

Sergii is a problem-solver and critical-thinker. Teammates come to him with challenging questions from both the technical and business areas.  

Opanasenko has a strong technical background. When launching Greenice, he already had extensive experience in web development and project management. He started as a freelancer and then decided to create an agency with his partner Ismet Beckirov (learn more about this in ‘Our Story’). 

He has a bachelor’s degree in Precision Mechanics and Metrology Engineering. 

Outside of work, Sergii enjoys spending time with his family. He also loves yachting and travelling.

Connect with Sergii on Linkedin

 

Specializes
Business Automation Marketplace Start a Project Technologies eLearning

Articles

Building a CRM system: A step-by-step guide for businesses
Business Automation Building a CRM system: A step-by-step guide for businesses

A Customer Relationship Management (CRM) system is the heart of any modern business — helping you organize leads, automate sales, and deliver better customer experiences. But with so many ready-made, no-code, and custom options on the market, choosing the right path can be overwhelming.

In this guide, we’ll walk you through everything you need to know about how to build a CRM — from defining goals and planning workflows to selecting features, estimating costs, and understanding today’s key trends.

Key takeaways:

  • Start with clear goals. Define your customer journey, workflows, and priorities before development.
  • Choose the right approach. Use open-source or no-code tools for speed and budget — or go fully custom for unique processes and integrations.
  • CRM development costs vary by scope
    • From $5,000 — based on white-label solutions. 
    • $15,000–25,000 — for CRMs built from scratch.
  • Modern trends (2025–26): AI-driven automation, modular architectures, vertical CRMs, compliance-by-design, and hybrid open-source setups.
  • Adoption is key. Training and support ensure your team actually uses and benefits from the system.
  • Partner with experts. A skilled agency like Greenice can help you plan, build, and scale a CRM that truly fits your business.
Sergii Opanasenko
24.10.2025
AI agent development trends 2025: Tools, industries, and rates
Technologies AI agent development trends 2025: Tools, industries, and rates

AI agents are no longer science fiction sidekicks - they’re slipping quietly into spreadsheets, call centers, and CRMs. What began as experiments in automation is now reshaping how businesses operate day to day.

To map this shift, we analyzed 542 AI agent development jobs posted on Upwork - one of the world’s largest freelance marketplaces. This dataset gives a rare, bottom-up view of what businesses are actually building and paying for in 2025. The picture that emerges is less about flashy demos and more about real infrastructure - agents that handle the grunt work, amplify human teams, and are fast becoming a standard feature of modern business.

And we’re not just observers: as a Top Rated Upwork agency with a long track record in AI development, we see these trends firsthand in client projects, giving us a unique vantage point to speak about where agent technology is headed.

Inna Lebedeva
16.10.2025
How much does an AI agent cost? A detailed breakdown
Business Automation How much does an AI agent cost? A detailed breakdown

So, how much does it cost to build an AI agent?

In most cases, the answer depends on complexity, integrations, and data requirements — but here’s a quick snapshot:

Simple Agent - Basic chatbot or FAQ assistant - $3K-$15K

Medium Agent - NLP, API integrations, basic learning - $20K-$50K 

Advanced Agent - Custom-trained, real-time, multimodal - $80K+ 

At Greenice, we’ve analyzed over 500+ AI agent development projects on Upwork and found that most businesses underestimate the true cost — especially when moving beyond prototypes to production-ready systems. 

In this article, we’ll break down what drives AI agent pricing, what clients typically expect versus actual market rates, and how you can plan your budget wisely. Whether you’re building a simple chatbot or a complex autonomous assistant, this guide will help you understand where your investment goes — and how to make every dollar count. Let’s dive into the agent development cost guide for 2025.

Inna Lebedeva
16.10.2025
AI software development: AIaaS vs. open-source vs. bespoke - Which is best?
Technologies AI software development: AIaaS vs. open-source vs. bespoke - Which is best?

Artificial intelligence (AI) represents a significant shift, promising to transform operations and drive innovation across industries. With the AI software market projected to hit $2 trillion by 2030 and more than half of businesses already integrating AI into their operations, the excitement around AI's potential is palpable. Yet, it poses challenges for many entrepreneurs.

As an experienced agency in the domain of Artificial Intelligence, we stand ready to guide you through these challenges. While over 76% of enterprises planned to increase their AI investments in 2023, we understand the challenges of adopting and scaling this technology.

Let us be your ally in creating AI software to unlock its power with confidence and precision.

What is AI software?

AI software refers to apps, websites, or programs that are powered by artificial intelligence to perform tasks that usually require human intelligence. These applications can range from chatbots that help answer your questions and recommendation systems on shopping sites that suggest products you may like, to more complex programs that can analyze large sets of data to find patterns.

Unlike traditional software that follows a strict set of rules, AI applications learn from the data they process, allowing them to improve over time and make decisions or provide insights that weren't explicitly programmed into them. For example, this is the case with AI chatbots.

Inna Lebedeva
19.09.2025
How to Create a Stock Photo Website Like Shutterstock, But Better
Marketplace How to Create a Stock Photo Website Like Shutterstock, But Better

Visual content is a powerful tool used by marketers and bloggers. It can increase audience engagement, brand awareness, and click-through rate on websites. Taking into account the incrementally growing interest in visuals for the years to come, why not build a website like Shutterstock?

We will give you the most important things you need to know based on a decade of experience in web development! Dive in.

Sergii Opanasenko
08.09.2025
How to Build an eLearning Website like Coursera (or Udemy)?
Marketplace How to Build an eLearning Website like Coursera (or Udemy)?

Platforms like Coursera, Udemy, Udacity, and edX have transformed online education. With more than 50 MOOC platforms operating in 23 countries, there are opportunities to create similar platforms. This article explores the feasibility and differences in building an eLearning website like Coursera or Udemy, uncovering the exciting possibilities within this field.

Sergii Opanasenko
05.09.2025
AI
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