Top AI Development Companies in Eastern Europe (2026)

AI development companies to consider in Eastern Europe include Lexis Solutions, N-iX, SoftServe, STX Next, deepsense.ai, Neoteric and ASSIST Software. They range from a senior team of around 15 to firms with more than 10,000 people, and they deliver from Bulgaria, Poland, Romania, Ukraine and other countries in the region.

Eastern Europe has become one of the main places where companies in Western Europe and North America build AI systems. The region combines strong engineering education, overlapping working hours with Europe and part of the US day, and, in EU countries, the same data protection rules as the rest of the EU. The differences between companies are large, though: some are AI specialists, some are broad engineering firms with AI practices, and some are small senior teams.

This guide compares seven AI development companies in the region, what their public materials say about their AI work, and the questions to ask before you hire one.

Published by Lexis Solutions, which is included in this guide. Company information was reviewed on 5 November 2026 using each company's public website and the other linked sources. Suggested fit is our editorial assessment; listing order is not a ranking.

How we selected these companies

We considered the following when choosing which companies to include:

AI delivery: public service pages, case studies or partner status covering AI agents, generative AI, RAG or machine learning.
Engineering in Eastern Europe: headquarters or main delivery teams in the region.
Range of sizes and focus: AI specialists, large engineering firms and small senior teams, so buyers can compare different ways of working.
Spread across the region: companies from Bulgaria, Poland, Romania and Ukraine.

What to expect from an AI development company in Eastern Europe

Rates: on Clutch's list of AI companies in Eastern Europe, most firms list hourly rates between $25 and $99, with a few specialists listing $100 to $199.
Time zones: Poland is on Central European Time. Romania, Bulgaria and Ukraine are one hour ahead. Teams overlap with the whole Western European day and with the morning of the US East Coast.
Data protection: Poland, Romania and Bulgaria are EU members, so partners delivering from there work under the GDPR. Delivery from outside the EU, such as Ukraine, needs a transfer mechanism such as standard contractual clauses.
Team model: most companies offer fixed-scope projects, dedicated teams or individual engineers added to your team. Ask who will actually work on your system.

A quick comparison of AI development companies in Eastern Europe

| Company | Based in | Founded | Size | AI focus | |---|---|---|---|---| | Lexis Solutions | Sofia, Bulgaria | 2017 | Around 15 | AI agents, RAG, AI internal tools, data pipelines | | N-iX | Malta HQ, delivery across Eastern Europe | 2002 | 2,400+ engineers | AI agents, generative AI, RAG, data platforms | | SoftServe | Lviv, Ukraine and Austin, US | 1993 | 10,000+ | Generative AI and agents at enterprise scale | | STX Next | Poznań, Poland | 2005 | 450+ | AI agents, enterprise RAG, document processing | | deepsense.ai | Warsaw, Poland | 2014 | About 120 AI experts | AI agents, LLMs, RAG, MLOps, computer vision | | Neoteric | Gdańsk, Poland | 12+ years ago | 50+ | Generative AI, GPT integration, AI MVPs | | ASSIST Software | Suceava, Romania | Not stated | About 350 | AI and ML, data engineering |

Seven AI development companies in Eastern Europe

1. Lexis Solutions

Lexis Solutions is an AI engineering company founded in 2017 and headquartered in Sofia, Bulgaria. It is a Select Partner in Anthropic's Claude Partner Network, and 90% of its engineers are Claude Certified Architects. The senior-led team of around 15 works with startups, SMEs and enterprises in Germany, the US, the UK and Finland.

It builds AI-native and agentic software: AI agents and multi-agent systems with tool calling and custom MCP servers, RAG and knowledge systems with evaluated answer accuracy, AI-powered internal tools for triage, routing, reporting and document processing, and the web and mobile interfaces around them. It works across Anthropic, OpenAI, AWS Bedrock, Google Vertex AI and xAI models and chooses the model per task. Data access is scoped to each user's identity by the underlying system. Lexis Solutions is ISO 9001:2015 certified and has 30+ verified client reviews on Clutch.

Best fit: companies that want a small senior team to take one AI system from scoping to production. AI development at Lexis Solutions

2. N-iX

N-iX was founded in 2002 in Lviv, Ukraine, is headquartered in Malta and has more than 2,400 engineers. It lists offices in ten countries, including Poland, Bulgaria, Romania, Ukraine, the UK and the US. Its AI offering covers AI agent development, generative AI, RAG, machine learning and computer vision, backed by data engineering, data warehouse and data governance services.

Best fit: larger programmes where AI depends on substantial data platform work. N-iX company overview

3. SoftServe

SoftServe was founded in 1993 in Lviv, Ukraine, and has headquarters in Lviv and Austin, Texas, with more than 10,000 people and offices in over a dozen countries. Its generative AI lab reported building more than 200 AI solutions for over 100 clients in two years, including agents for software development and business tasks, and taking solutions from prototype to large-scale deployment for clients such as Cisco and Dell.

Best fit: large enterprises that need AI delivered at scale alongside cloud and platform partners. SoftServe on Wikipedia

4. STX Next

STX Next was founded in 2005 and is headquartered in Poznań, Poland, with more than 450 specialists and offices including London, Eschborn and Houston. Its AI services include AI agent development, enterprise RAG, OCR and intelligent document processing, AI strategy consulting and responsible AI implementation, alongside long-standing Python and data engineering work.

Best fit: companies that want a larger Polish partner with strong Python and data skills. STX Next

5. deepsense.ai

deepsense.ai was founded in 2014 and is headquartered in Warsaw, Poland, with an office in Palo Alto, California. Its team of about 120 AI experts works on AI agents, generative AI, LLMs, RAG including agentic RAG pipelines, MLOps and computer vision. It lists itself as an Anthropic Service Partner, an OpenAI Services Partner and a Gemini Enterprise Implementation Partner, and reports 200 completed commercial AI projects. Clients include Unstructured, Sky, Hexagon, Zebra Technologies and Brainly.

Best fit: companies that want an AI-specialist firm with deep machine learning experience. deepsense.ai

6. Neoteric

Neoteric is headquartered in Gdańsk, Poland, with an office in New York, and has more than 50 people, over 90% of them at senior level. Its AI services include AI development, generative AI, GPT integration, AI consulting, AI MVP development and an AI exploratory workshop. It reports more than 300 delivered projects over 12+ years.

Best fit: startups and product teams that want to validate an AI product idea and build an MVP. Neoteric

7. ASSIST Software

ASSIST Software is based in Suceava, Romania, and had about 350 employees in 2024. It runs a dedicated AI department and opened an AI Center in Suceava in 2024. Clutch named it among Romania's best AI and machine learning companies in 2024.

Best fit: companies that want a mid-sized Romanian engineering partner with a dedicated AI team. ASSIST Software AI Center

How to choose an AI development company in Eastern Europe

Ask each candidate the same questions:

Who will build the system? Meet the engineers and confirm whether they are employees or subcontractors.
What have you put into production? Ask for a system that real users rely on, and how its accuracy and reliability are measured.
Where is our data processed? Ask for the data processing agreement, the sub-processors and the countries where the team and the AI models run.
How are permissions enforced? AI agents should only reach data the user is allowed to see, enforced by the system rather than by prompt instructions.
Which models do you use, and why? A good partner can explain when it uses Claude, GPT, Gemini or open models, and how it evaluates the choice.
What happens after launch? Clarify monitoring, support, handover and ownership of code and models.

Start with one measurable workflow

The most reliable way to test an AI development partner is a short, scoped project around one workflow you can measure, such as triaging support tickets, answering questions over internal documents or extracting data from contracts. It shows how the team works, how they handle your data and whether the result holds up with real users.

If you are planning an AI system that has to work in production, Lexis Solutions can help you scope a first workflow.