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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.

Read More About Us
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

New Year’s Resolutions: Notes from Inside Greenice
New Year’s Resolutions: Notes from Inside Greenice

The past year was intense, fast, and sometimes unpredictable. We worked on very different products, solved very different problems, and learned (again) that flexibility is not a “nice to have” - it’s a requirement. Overall, it was a year that pushed us to think deeper, move smarter, and appreciate the people we work with even more.

Inna Lebedeva
16.01.2026
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 $7,000 — based on white-label solutions. 
    • $15,000–25,000 — for CRMs built from scratch.
  • Modern trends (2026): 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
15.01.2026
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
15.01.2026
Custom software development cost 2026: Key factors and how to manage them
Start a Project Custom software development cost 2026: Key factors and how to manage them

Are you an entrepreneur who wants to know “how much does software development cost?”

Drawing from over a decade of experience as a top-rated web development agency with a global clientele, we've observed that the average web development project typically takes 1 to 6 months, with costs ranging between $5,000 and $30,000. However, these figures can vary significantly based on a multitude of factors. To learn more about what influences these costs, continue reading.

At Greenice, we deeply understand the nuances of software development costs and are dedicated to delivering solutions tailored to meet your business needs. Since our inception in 2007, we have successfully completed over 200 projects, collaborating with clients across the globe.

Sergii Opanasenko
15.01.2026
Web app development cost: Comprehensive 2026 pricing guide
Start a Project Web app development cost: Comprehensive 2026 pricing guide

Do you have a decent idea for an app and need to know “how much does it cost to build a web application”?

Drawing on more than ten years of experience as a leading web development agency with clients around the world, we've found that most web app projects take between 1 to 6 months to complete, with costs usually falling between $5,000 and $30,000. But this is a very average estimate and many of our clients have spent $100,000+ to create the applications of their dreams.

In this article, we will tell you how to estimate your future web app and what factors affect the cost. 

At Greenice, we're experts in crafting cost-effective web apps tailored to your business needs. Since 2007, we've successfully completed over 200 projects across various industries, proving our versatility and expertise.

Sergii Opanasenko
15.01.2026
AI agent development trends 2026: Tools, industries, and rates
Technologies AI agent development trends 2026: 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 2026. 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
15.01.2026
AI
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