Sofia has quietly grown into one of the more capable AI ecosystems in Eastern Europe. The combination of strong technical talent, very solid engineering culture and still-reasonable rates makes the city attractive for companies that want production-grade AI work rather than just proofs of concept or flashy prototypes. Many of the top players here have already shipped serious machine-learning pipelines, computer-vision systems, recommendation engines, predictive-maintenance models and - increasingly - large language model integrations that actually deliver measurable value inside real business processes.

What sets the strongest Sofia-based AI consulting teams apart is their end-to-end approach. They usually start with structured discovery sessions to separate hype from opportunity, move into data assessment and architecture design, then build, deploy and monitor solutions that are meant to run reliably for years, not just impress in a demo. Clients from finance, logistics, retail, manufacturing and healthcare frequently choose these providers because they get nearshore speed and communication without sacrificing quality or depth. When the goal is to move from “we should probably do something with AI” to “this model is now saving us X hours / € per month”, the better Sofia teams know how to make that journey practical and predictable.

 

1. OSKI Solutions

At OSKI Solutions we build custom software and web solutions that help businesses in Sofia modernize their operations and scale effectively. We take projects from initial planning and design all the way through development, deployment, and long-term support. A large part of our work involves updating legacy systems, creating new scalable applications, and connecting different business processes into a unified digital environment.

We help companies incorporate artificial intelligence into their existing systems in a practical way. While we are not a narrow AI-only firm, we have been regularly adding machine learning and AI-driven features to our .NET and Python projects for several years - usually as part of larger digital transformation work. Clients typically come to us when they want AI to become a functional part of their core product or internal workflows rather than remain a separate experiment.

Key Highlights:

• Handle full-cycle development with integrated AI functionality
• Modernize legacy systems and migrate them to the cloud while adding AI capabilities
• Build web applications using .NET together with modern frontend frameworks
• Offer dedicated development teams and IT outsourcing services
• Integrate third-party systems (CRM, ERP, payment gateways) and AI services
• Implement AI and machine learning features within C# and Python environments

Services:

• Custom software development
• Web application development
• .NET and C# development
• Frontend development (React, Angular, Vue)
• Cloud solutions on Azure and AWS
• API development and third-party integrations
• Legacy system modernization
• Dedicated development teams
• CMS-based solutions including Umbraco
• Microservices and serverless architecture
• Machine learning and AI feature implementation

Contact Information:

• Website: oski.site
• Phone: +48571282759
• Email: contact@oski.site
• Address: Kaupmehe tn 7, 10114 Tallinn, Estonia
• LinkedIn: www.linkedin.com/company/oski-solutions

 

 

 

 

2. Sigma Software

Sigma Software handles the full spectrum of AI work, from initial planning to getting systems running in production. The company focuses on matching AI approaches to real business needs, setting up governance, and building structures that let organizations use AI in a responsible way. Much of the effort goes into turning separate experiments into something that works across different parts of a company.

The work covers deploying agent-based platforms, automating workflows, creating search tools for internal knowledge, and integrating AI into software development processes. Additional attention goes to compliance with regulations, securing AI systems, and creating custom tools like corporate assistants that connect documents and communication channels. The emphasis stays on practical, measurable changes rather than just adding new technology.

Key Highlights:

• Covers AI strategy through to deployment and ongoing maintenance
• Builds agentic automation and knowledge retrieval systems
• Develops proprietary tools like corporate navigators
• Implements compliance frameworks for AI systems
• Focuses on AI in software engineering processes

Services:

• AI strategy and advisory
• Data governance and readiness assessments
• Enterprise generative AI platform deployment
• Agentic workflow automation
• Corporate search and knowledge management
• AI prototype development
• AI solution verification and validation
• AI compliance and cybersecurity

Contact Information:

• Website: sigma.software
• Email: info@sigma.software
• Address: Boulevard "Cherni vrah" 51, 1407, Promishlena zona Hladilnika, Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/sigma-software-group
• Facebook: www.facebook.com/SIGMASOFTWAREGROUP
• Twitter: x.com/sigmaswgroup
• Instagram: www.instagram.com/sigma_software

 

3. Dreamix

Dreamix builds custom AI and machine learning solutions that fit into specific business data and processes. The company handles development of models trained on client information, along with systems for visual analysis, recommendations, and large-scale data processing. Projects often aim at improving efficiency or customer interactions through practical implementations.

Consulting starts with evaluating where AI fits best, followed by roadmaps for adoption. The approach includes generative AI setups, computer vision for monitoring, and recommender systems based on user behavior. Everything stays tied to the existing setup while allowing for future expansion.

Key Highlights:

• Develops models using client-specific data
• Works on computer vision and recommender systems
• Builds scalable machine learning architectures
• Provides AI consulting and roadmaps
• Integrates generative AI for task handling

Services:

• Custom AI and ML development
• Generative AI model creation
• Computer vision implementations
• Recommender system design
• Deep learning at scale
• AI/ML consulting

Contact Information:

• Website: dreamix.eu
• Phone: (+359) 884116309
• Email: business@dreamix.eu
• Address: Tintyava 15-17 Str., Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/dreamix-ltd
• Facebook: www.facebook.com/dreamix.eu
• Twitter: x.com/Dreamix_Ltd

 

4. Civitta

Civitta works on AI projects that apply computer vision and process automation to make operations smoother or improve user experiences. The company deals with object detection, image recognition, and training custom models for specific needs. Some projects focus on practical applications like monitoring or automation in different industries.

For companies in Finland, Civitta assists with funding applications for generative AI initiatives, helping with idea development, application preparation, and implementation. The focus remains on delivering functional solutions rather than broad experimentation.

Key Highlights:

• Applies computer vision for object and motion recognition
• Automates business processes using AI
• Supports funding for generative AI projects in Finland
• Handles model training and implementation
• Works on both server and client-side processing

Services:

• Computer vision development
• Process automation with AI
• Custom model training
• AI project ideation and funding assistance
• Implementation of AI solutions

Contact Information:

• Website: civitta.com
• Phone: +40 722 316 036 
• Address: Bulgaria, Tsaribrodska st. 94, Sofia, 1309
• LinkedIn: www.linkedin.com/company/civitta
• Facebook: www.facebook.com/civitta.int
• Twitter: x.com/CivittaX
• Instagram: www.instagram.com/civittainternational

 

5. App Streams

App Streams implements AI solutions that integrate with mobile and web applications. The company uses tools like OpenAI, LangChain, and various databases to add AI features to existing systems. Work often combines AI with mobile development, backend setup, and user interface design.

The scope includes building responsive applications that incorporate AI capabilities alongside standard development practices. Quality checks ensure everything functions as intended across different devices and environments.

Key Highlights:

• Integrates AI into mobile and web projects
• Uses OpenAI and related frameworks for implementation
• Handles backend and DevOps alongside AI
• Develops native and hybrid mobile apps
• Focuses on user experience in AI-enhanced solutions

Services:

• AI implementation and integration
• Mobile app development
• Web application development
• Backend and DevOps services
• UX/UI design
• Quality assurance testing

Contact Information:

• Website: www.app-streams.com
• Email: info@app-streams.com
• Address: ul. Burel 1, Sofia
• LinkedIn: www.linkedin.com/company/app-streams-ltd
• Facebook: www.facebook.com/appstreamss
• Instagram: www.instagram.com/app_streams

 

6. Ontotext

Ontotext works with knowledge graphs and semantic technologies, with a strong focus on biomedical and life sciences applications. The company builds systems that connect structured and unstructured data from scientific publications, patents, and various public sources. This approach helps organize scattered biomedical information into a single, searchable structure where relationships between genes, proteins, diseases, and compounds become easier to explore and analyze.

The main product in this area is a platform designed for target discovery in drug research. It uses natural language processing to extract facts and connections automatically, then makes those visible through search and analytics tools. Researchers and organizations use it to find possible new drug targets or repurposing opportunities by looking at patterns and links that would be hard to spot manually across millions of documents.

Key Highlights:

• Builds centralized knowledge graphs from biomedical sources
• Extracts relationships from publications and patents using NLP
• Provides data provenance and confidence scores for results
• Allows integration of custom machine learning algorithms
• Offers user-friendly exploration without requiring deep technical skills

Services:

• AI-powered target discovery for drug research
• Biomedical knowledge graph creation and enrichment
• Relationship extraction from scientific literature
• Predictive analytics for novel target identification
• Data integration from public biomedical databases

Contact Information:

• Website: www.ontotext.com
• Phone: +359 2 974 61 60
• Email: info@ontotext.com
• Address: 111R Tsarigradsko Shosse blvd., Synergy Tower, fl. 12, Sofia 1784, Bulgaria
• LinkedIn: www.linkedin.com/company/ontotext-ad
• Twitter: x.com/ontotext

 

7. Delogica

Delogica operates as an AI agency based in Sofia with a focus on practical business applications of artificial intelligence. The company handles projects involving text processing, image analysis, code-related tasks, and information extraction. It delivers solutions built around machine learning models and generative AI techniques to automate and improve different business processes.

The work covers robotic process automation, predictive modeling, and custom language model applications. Clients come from various sectors looking for ways to handle repetitive tasks or gain insights from existing data. The agency also participates in the local AI community through AI Cluster Bulgaria.

Key Highlights:

• Focuses on text, image, code and information processing
• Builds solutions with generative AI and neural networks
• Offers robotic process automation implementations
• Develops predictive analysis models
• Works on custom language model applications

Services:

• Robotic Process Automation (RPA)
• Machine learning development
• Predictive analysis solutions
• Information analysis systems
• Language model implementations

Contact Information:

• Website: delogica.eu
• Phone: +359 892 990 970
• Email: sbonchev@icloud.com
• Address: Vrubnitsa 537 A1, Sofia, Bulgaria
• Facebook: www.facebook.com/delogica

 

8. N-iX

N-iX offers AI consulting that centers on building custom solutions for data handling and process automation. The company works with enterprises to connect AI approaches to specific business objectives, mainly in areas like finance, manufacturing, retail, and healthcare. Projects usually involve analyzing existing data flows and creating systems that produce practical outputs for decision-making or operational improvements.

The scope covers everything from initial strategy discussions to actual model building and deployment. Attention goes toward generative AI setups, computer vision applications, and predictive models, with an emphasis on fitting solutions into current infrastructure. Case examples include work on logistics optimization, customer retention prediction, and finance process improvements using different AI techniques.

Key Highlights:

• Works on AI strategy and implementation across several industries
• Builds solutions using generative AI, computer vision, and predictive analytics
• Focuses on connecting AI outputs to existing business processes
• Develops agent-based and multi-agent systems
• Creates retrieval-augmented generation pipelines

Services:

• AI strategy consulting
• Data strategy and architecture design
• AI implementation roadmaps
• Feasibility assessments for AI projects
• Custom AI solution design and development
• Generative AI consulting
• Natural language processing applications
• Predictive and prescriptive analytics

Contact Information:

• Website: www.n-ix.com
• Phone: +17273415669
• Email: contact@n-ix.com
• Address: 51 Cherni Vrah Blvd, 1407 Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/n-ix
• Facebook: www.facebook.com/N.iX.Company
• Twitter: x.com/N_iX_Global

 

9. Vector Labs

Vector Labs concentrates on guiding companies through the planning and building of AI and machine learning initiatives. The process starts with evaluating current data and AI readiness, then moves into creating a clear plan that lists use cases, priorities, needed resources, and steps from early prototypes to live systems. The aim is to keep things realistic and tied to actual business return.

Development covers building models and applications, while ongoing support handles monitoring and updates after deployment. The company deals with common challenges like moving from prototypes to stable production systems, making sure models stay accurate when connected to live data and business workflows.

Key Highlights:

• Helps create AI strategies with step-by-step execution plans
• Covers full cycle from idea to production deployment
• Works on model monitoring and performance maintenance
• Focuses on measurable and controlled AI solutions
• Integrates AI outputs into existing organizational processes

Services:

• AI and ML strategy development
• AI maturity and readiness assessments
• Use case identification and prioritization
• AI solution development from POC to production
• Forecasting and predictive model building
• Recommendation systems
• Natural language processing solutions
• Computer vision applications
• AI operations and pipeline maintenance

Contact Information:

• Website: vector-labs.ai  
• Email: team@vector-labs.ai
• Address: Sofia, Bulgaria, 40 Tsarigradsko shose Blvd
• LinkedIn: www.linkedin.com/company/vectorlabsai
• Facebook: www.facebook.com/vectorlabsai

 

10. Lexis Solutions

Lexis Solutions provides AI consulting and implementation services with an emphasis on fitting solutions into existing business systems. The company works on projects that automate routine tasks, improve data analysis, support forecasting, and enhance customer-facing platforms. Attention stays on making adoption smooth and keeping systems flexible as needs change.

Projects often involve creating custom setups that deliver insights or automate decisions in real time. The approach includes defining requirements, estimating costs, and moving forward with development that stays aligned with the specific context of each business.

Key Highlights:

• Focuses on integration of AI into current workflows
• Works on solutions for data analytics and forecasting
• Handles automation of repetitive business tasks
• Builds customer service related AI platforms
• Emphasizes scalable and adaptable AI infrastructure

Services:

• AI strategy and consulting
• AI-driven business optimization
• Data analytics and forecasting solutions
• Task automation systems
• Customer service AI platforms

Contact Information:

• Website: www.lexis.solutions
• Phone: +359 898 548 929
• Email: deyan.denchev@lexis.solutions
• Address: 10 Bratya Chakrin Str, Vitosha District, 1113 Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/lexis-solutions
• Twitter: x.com/lexissol

 

11. Accedia

Accedia runs an AI-focused practice that develops solutions in areas like deep learning, computer vision, natural language processing, and predictive analytics. The company combines model-building with full application development to address specific business problems. Work includes preparing data, training models, evaluating results, and deploying systems that require ongoing oversight.

The process usually begins by mapping out business needs and available data, followed by planning, model creation, and performance checks. Examples cover predictive maintenance through image analysis, demand forecasting, marketing response modeling, sentiment tracking, and specialized text classification tasks.

Key Highlights:

• Develops solutions across computer vision and natural language processing
• Builds predictive models for business forecasting
• Creates process automation systems
• Works on sentiment and text classification models
• Handles end-to-end AI implementation

Services:

• Deep learning model development
• Computer vision solutions
• Natural language processing applications
• Predictive analytics models
• Process automation systems
• Enterprise security AI applications

Contact Information:

• Website: accedia.com
• Phone: +359 (2) 444 20 03
• Email: info@accedia.com
• Address: 13 Henrik Ibsen Str., 1407, Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/accedia
• Facebook: www.facebook.com/accediajsc
• Twitter: x.com/AccediaIT
• Instagram: www.instagram.com/accedia_jsc

 

12. PWR Teams

PWR Teams helps companies build and scale tech teams, providing reliable talent without long hiring cycles. They create long-term dedicated teams, as well as quick QA setups and short-term specialist groups for projects requiring specific skills. Their focus is on matching people to ongoing product development or handling testing before launches.

Clients typically seek support to engage experienced developers or bring niche expertise on board without building everything in-house. This approach allows full control over the team while removing much of the day-to-day people management. Examples include IoT systems for healthcare access control and data-driven projects like automated irrigation scheduling.

Key Highlights:

• Builds long-term dedicated development teams
• AI consulting
• Offers very quick start for QA and testing projects
• Provides short-term specialist teams for niche needs
• Handles recruitment and retention internally
• Works with companies that already have product direction

Services:

• Dedicated Teams
• TestLab QA services
• Team as a Service
• Long-term team augmentation
• Rapid QA team deployment

Contact Information:

• Website: pwrteams.com
• Address: 17 Henrik Ibsen Street, 5th floor, Lozenetz District, Sofia 1407, Bulgaria
• LinkedIn: www.linkedin.com/company/pwrteams
• Facebook: www.facebook.com/pwrteams.company
• Twitter: x.com/pwrteams_global
• Instagram: www.instagram.com/pwrteams

 

13. Bulcode

Bulcode provides technology consulting that covers the early strategic side through to actual delivery of digital products. The company carries out IT audits, designs solution architecture, does business analysis, creates user interfaces, and takes care of cybersecurity questions. Projects often involve complete website builds or platform overhauls combined with DevOps practices and quality checks.

Clients range from airports modernizing passenger-facing digital services to travel agencies building booking systems and edtech platforms focused on personal development. The approach usually mixes several disciplines at once - analysis, design, development, testing, deployment - so the result fits into existing business operations rather than forcing big changes.

Key Highlights:

• Conducts comprehensive IT audits
• Designs scalable solution architecture
• Performs detailed business analysis
• Creates user-centered UX/UI
• Implements cybersecurity measures

Services:

• Technology consulting
• IT audit services
• Solution architecture
• Business analysis
• UX/UI design
• Cybersecurity services
• Web development
• DevOps
• Project management
• Quality assurance

Contact Information:

• Website: www.bulcode.com
• Phone: +359883312438
• Email: hello@bulcode.com
• Address: 47A bul. Cherni vrah, Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/bulcode
• Facebook: www.facebook.com/bulcode
• Twitter: x.com/bulcode_com
• Instagram: www.instagram.com/bulcode_com

 

14. AIAssist.bg

AIAssist.bg develops custom AI ecosystems built around autonomous agents designed for specific business workflows. The company follows a structured process that starts with assessing readiness, runs strategy sessions, carries out audits, builds tailored agents, tests everything thoroughly, deploys, and then provides ongoing support. Emphasis stays on making solutions fit inside the existing organization rather than replacing people outright.

The approach combines technical implementation with strategic alignment and workforce preparation. Training programs and workshops help internal teams get comfortable working alongside AI tools. The focus is on measurable outcomes like efficiency gains and cost reductions while keeping systems adaptable as the company grows.

Key Highlights:

• Builds custom autonomous AI agents
• Uses a three-pillar framework (technology, strategy, people)
• Offers end-to-end implementation from audit to ongoing support
• Runs AI readiness assessments and strategy sessions
• Provides workforce upskilling programs

Services:

• Strategic AI consulting
• Custom AI agent development
• AI readiness audits
• AI ecosystem integration
• Workforce AI upskilling
• Ongoing AI management and support

Contact Information:

• Website: aiassist.bg
• Email: info@aiassist.bg
• Address: “8-mi Dekemvri” boulevard No. 13, Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/ai-assist-bg
• Facebook: www.facebook.com/people/AI-Assist-BG/61554908662701
• Instagram: www.instagram.com/ai.assist.bg

 

15. Protiviti

Protiviti delivers artificial intelligence consulting services with a strong emphasis on responsible and practical adoption. The company helps organizations identify high-value AI use cases, build custom solutions or leverage existing technologies, and integrate them into daily operations. A big part of the work revolves around balancing opportunity with risk - especially around transparency, data privacy, security, and changing regulations.

Many projects focus on automation and efficiency gains in areas like invoice processing, CV screening, compliance reporting, and financial-crime alert handling. Protiviti operates its own AI Studio - a physical, hands-on space where clients can experiment with their own data and challenges under guidance. The company also maintains proprietary platforms (Protiviti Atlas and Protiviti GPT) that speed up delivery while keeping things compliant and secure. It's a mix of strategic consulting, hands-on building, and long-term support rather than one-off implementations.

Key Highlights:

• Runs an in-person AI Studio for client experimentation
• Maintains proprietary AI platforms (Atlas and GPT)
• Focuses heavily on responsible AI practices
• Handles both custom builds and integration of existing AI tools
• Covers a wide range of industries and business functions

Services:

• AI strategy and opportunity identification
• Custom AI solution development
• AI-powered automation (RPA + ML)
• Responsible AI governance and compliance
• AI Studio sessions and prototyping
• Industry-specific AI use cases
• Risk & compliance AI applications

Contact Information:

• Website: www.protiviti.com
• Phone: +359 894 313999
• Address: RING TOWER, blv. Okolovrasten pat 251Е, fl.14, Sofia, Bulgaria
• LinkedIn: www.linkedin.com/company/protiviti
• Facebook: www.facebook.com/protiviti
• Twitter: x.com/protiviti
• Instagram: www.instagram.com/protiviti

 

16. Cosmos Thrace

Cosmos Thrace works on production-ready AI solutions that range from straightforward predictive models to more advanced LLM agents. The company puts a lot of effort into making sure everyone involved - executives, technical people, business users - actually understands what the system is doing and why the results look the way they do. It's not about throwing fancy models at problems; the focus stays on getting something reliable that people trust enough to use every day.

Many projects start because internal know-how is limited or data quality isn't quite there yet. Cosmos Thrace usually steps in with clear documentation for every prediction, built-in governance from the beginning, and suggestions on what makes sense to build first. They keep things platform-agnostic so the solution can live on Databricks, Azure, AWS, or whatever stack the client already has. The whole point seems to be avoiding the usual situation where something gets deployed and then nobody really knows how to maintain it or measure whether it's worth the money.

Key Highlights:

• Builds explainable models with full documentation
• Designs AI systems with governance and security from the start
• Works on any major cloud or existing infrastructure
• Offers proactive advice on use cases and priorities
• Focuses on making AI understandable for non-technical stakeholders

Services:

• AI consulting
• Machine learning development
• Predictive analytics
• LLM agent implementation
• Governed AI architecture design
• Model explainability and documentation
• AI deployment and observability

Contact Information:

• Website: cosmosthrace.com
• Phone: +359 876102110
• Email: hi@cosmosthrace.com
• Address: Sofia Tech Park,
Incubator Building, 
111 B Tsarigradsko Shosse Blvd., 
1784 Sofia, Bulgaria

Conclusion

Sofia has become a surprisingly capable spot for companies looking to work with AI in a serious, no-nonsense way. What stands out is not flashy promises or massive hype, but rather a lot of engineers and consultants who actually ship working solutions - often at a pace and price point that’s hard to match in Western Europe or North America. Whether the goal is to automate something painful, get better predictions from existing data, or carefully integrate large language models into day-to-day operations, there are people here who have done it before and know the difference between a demo and production reality.

The practical side of AI adoption still matters more than the theory. Most businesses don’t need another proof-of-concept; they need partners who can map out what’s realistic, handle the messy data situations, avoid the common traps, and deliver something that keeps running after the consultants leave. Sofia’s strength lies exactly in that kind of grounded, engineering-first approach. If you’re thinking about starting (or restarting) an AI initiative, it’s worth looking at what’s happening here. You might find the combination of skill, pragmatism and reasonable cost is exactly what makes the difference between a project that sounds good on paper and one that actually moves the needle.