The choice of the right software development partner is critical to the success of your SaaS product. It affects not only the quality of implementation but also the scalability, sustainability, and long-term maintainability of your solution. Eastern Europe has become a preferred region for software development due to its combination of highly skilled IT professionals, competitive rates, and a mature tech ecosystem.

Here, we’ve compiled a list of the top 10 SaaS app development companies, selected based on their expertise, proven track record, and industry recognition.

1. Seedium

Founded: 2017
Headquarters: Tallinn, Estonia
Locations: Estonia, Ukraine, USA
Rates: $25-49

Seedium is a trusted web & mobile development company with extensive expertise in building and scaling SaaS products. Established in 2017 as a development partner for startups, Seedium has since expanded its capabilities to support scale-ups, SMBs, and enterprises. The company combines best practices in cloud-based development with the latest advances in AI to deliver innovative solutions that meet both market demands and the unique business needs of its clients.

Over the past eight years, Seedium has successfully delivered more than 200 projects, earning industry recognition as a reliable SaaS development company across HRTech, Real Estate, Healthcare, FinTech, eCommerce, Sports & Fitness, and more.

With 95% of clients recommending its services and 60% returning for additional projects, Seedium continues to build lasting relationships with businesses worldwide, partnering with companies in the EU, the USA, the Middle East, Australia, and New Zealand.

2. Geniusee

Founded: 2017
Headquarters: Austin, USA
Locations: Poland, Ukraine, Sweden, USA
Rates: $25-49

Geniusee is a software product development company with a sales office in the USA and engineering hubs in Poland and Ukraine. The company specializes in delivering full-cycle software development services, including AI-powered applications, cloud infrastructure, and DevOps solutions.

Geniusee has completed over 180 projects across various industries, including FinTech, EdTech, Retail, and Real Estate. The company emphasizes a client-oriented approach, helping its clients gain competitive advantages and increase ROI.

3. Future Processing

Founded: 2000
Headquarters: Gliwice, Poland
Locations: Poland, Ukraine, Germany, UK, Switzerland, USA
Rates: $50–99

Future Processing is a technology consultancy and software delivery partner established in 2000 in Gliwice, Poland. With a team of over 1,000 professionals, the company specializes in delivering end-to-end IT solutions, from vision to reality. Future Processing works with SMEs and market-leading brands, including Fortune 500 companies.

The main company specializations include AI & ML, Cloud, Cybersecurity, Data Solutions, and Software Development. Consistently ranked among the top software developers for excellence in cloud consulting services.

4. 10Clouds

Founded: 2009
Headquarters: Warsaw, Poland
Locations: Poland
Rates: $50–99

10Clouds is a Poland-based agile software development company specializing in building top-quality web and mobile applications. Since its inception in 2009, the company has delivered a variety of projects for companies of all sizes, from one-person startups to enterprises, universities, and non-profits.

10Clouds is well-known for its expertise in HR, Fintech, GenAI, and Blockchain. With a team of over 100 experienced developers and designers, the company has built software for more than 90 businesses worldwide, primarily in the United States, Western Europe, and Australia.

5. Infinum

Founded: 2005
Headquarters: Zagreb, Croatia
Locations: Croatia, Slovenia, Macedonia, Netherlands, Montenegro, UK, USA
Rates: $150–$199

Infinum is a digital product agency specializing in custom software development, mobile and web applications, AI and data engineering, IoT solutions, enterprise platforms, and cybersecurity. Since its inception in 2005, Infinum has partnered with forward-thinking brands and organizations to build and scale digital products that transform businesses.

The company has a team of over 370 professionals across its global offices. Infinum is known for its agile approach and efficiency.

6. RubyGarage

Founded: 2011
Headquarters: Tallinn, Estonia
Locations: Ukraine, Estonia
Rates: $50-$99

RubyGarage is a full-cycle custom software development company specializing in web and mobile applications. The company has delivered over 60 successful projects in Fintech, EdTech, Telehealth, and eCommerce. Their client base includes enterprises, startups, and accelerators.

The company's core expertise lies in Ruby on Rails, complemented by a range of modern technologies to build robust frontend, backend, and infrastructure solutions. RubyGarage follows CISQ standards to ensure the development of reliable, maintainable, secure, and efficient software.

7. Brights

Founded: 2011
Headquarters: Kyiv, Ukraine
Locations: Ukraine, Poland, USA
Rates: $25–$49

Brights is a software development company specializing in custom web and mobile applications, MVP development, AI solutions, and SaaS platforms. With a team of over 100 specialists, Brights collaborates with startups and enterprises across the US, UK, and Europe.

The company offers services for Finance, Insurance, Logistics, eCommerce, Media, Travel, and Hospitality. Brights is known for its strategic approach, agile methodologies, and commitment to delivering high-quality, user-centric solutions.

8. Dreamix

Founded: 2006
Headquarters: Sofia, Bulgaria
Locations: Bulgaria, UK, USA
Rates: $25–$49

Dreamix is a software development company specializing in building end-to-end digital products, from ideation and prototyping to design, testing, and launch. With over 18 years of experience, Dreamix has built a reputation for delivering innovative, scalable, and secure software solutions tailored to meet the unique needs of each client.

The company has successfully partnered with global enterprises across various industries, including Aviation, Healthcare, Transportation, and Fintech.

9. Langate Software

Founded: 2001
Headquarters: New York, USA
Locations: Ukraine, USA
Rates: $50–$99

Langate is a custom software development provider with over 20 years of experience. The company is focusing on delivering innovative solutions to businesses of all sizes. Langate has proven expertise in developing software solutions for the Healthcare and enterprise sectors, including HR, eCommerce, Finance, Marketing, and more.

Langate has a strong track record in developing SaaS platforms, particularly in the healthcare sector. The company has successfully collaborated with major organizations, including Microsoft Corp., to deliver large-scale healthcare projects.

10. Innowise

Founded: 2007
Headquarters: Warsaw, Poland
Locations: Poland, Lithuania, Germany, Switzerland, Italy, France, Georgia, UAE, UK
Rates: $50-$99

Innowise Group is a global software development company specializing in staff augmentation and software development. Innowise works with a wide range of industries, including Finance, Retail, Healthcare, Telecommunications, Government, and more.

Innowise Group has significant experience in SaaS development. They build custom SaaS applications that are cloud-native, scalable, and secure, integrating features like data analytics, AI/ML, and advanced UI/UX.

A Brief Comparison of the Top SaaS Application Development Companies

Let’s take a brief look at the listed companies, focusing on factors that matter for your choice, including rates, locations, and the industries they serve.

Company	Rates	Locations	Industries
Seedium	$25-49	Estonia, Ukraine, USA	HRTech, Real Estate, Healthcare, FinTech, eCommerce, Sports & Fitness, and more
Geniusee	$25-49	Poland, Ukraine, Sweden, USA	FinTech, EdTech, Retail, and Real Estate, and more
Future Processing	$50-99	Poland, Ukraine, Germany, UK, Switzerland, USA	Finance, Insurance, Media, and more
10Clouds	$50-99	Poland	HR, Fintech, GenAI, and Blockchain
Infinum	$150-199	Croatia, Slovenia, Macedonia, Netherlands, Montenegro, UK, USA	Finance, Healthcare, Retail, Telecom, and more
RubyGarage	$50-99	Ukraine, Estonia	Fintech, EdTech, Telehealth, and eCommerce
Brights	$25-49	Ukraine, Poland, USA	Finance, Insurance, Logistics, eCommerce, Media, Travel, and Hospitality
Dreamix	$25-49	Bulgaria, UK, USA	Aviation, Healthcare, Transportation, and Fintech
Langate Software	$50-99	Ukraine, USA	HR, eCommerce, Finance, Marketing, and more
Innowise	$50-99	Poland, Lithuania, Germany, Switzerland, Italy, France, Georgia, UAE, UK	Finance, Retail, Healthcare, Telecommunications, Government, and more

How to Choose a Top SaaS App Development Company for Your Project

The best way to choose a SaaS app development partner is to make a clear list of your requirements and see which companies meet them. You can contact several providers to discuss your project and evaluate their engagement.

Consider factors such as:

• Relevant technical and industry expertise

• Experience with similar projects

• Company size and team capacity

• Client references and case studies

• Cooperation and contract options

Remember that the best company is the one that can meet your unique needs and shows a genuine interest in your project's success.