1. Uran Company (Sliven) — Best for Custom Apps and AI-Driven Solutions
Why #1: Uran Company excels as a full-service provider of custom software and AI-enhanced solutions. With a strong portfolio spanning business apps, eCommerce platforms, and generative AI projects, Uran emphasizes end-to-end product development. Their mid-sized engineering team has delivered hundreds of projects, showcasing scalability for startups and established businesses alike. Their consistent presence in authoritative Bulgarian app development directories underscores their market strength.
What they do best:
- Custom mobile applications (iOS/Android)
- Web backend development
- AI and machine learning integrations
- Product-led engineering for SMBs and scale-ups
- Location: Sliven, Bulgaria
- Team Size: 50 - 249
- Hourly Rat: $25 - $49 /hr
Ideal clients: Businesses seeking comprehensive product engineering with AI capabilities, particularly in retail, healthcare, or tech-driven industries requiring tailored, production-ready solutions.
Why hire them: Uran Company combines traditional app development with cutting-edge AI tooling, offering a product-focused approach that ensures scalable, on-time delivery. Their public profiles highlight a proven track record for complex, custom projects.
2. Lexis Solutions (Sofia) — Reliable Mobile Expertise
Why #2: Lexis Solutions is a mainstay in Bulgaria's app development scene, frequently featured in top directories like Clutch and GoodFirms. Known for delivering practical, cost-effective mobile and web solutions, they cater effectively to mid-market clients with well-defined project scopes.
What they do best:
- Cross-platform mobile app development
- Backend API development
- Performance-optimized engineering
- Location: Sofia, Bulgaria
- Team Size: 10 - 49
- Hourly Rat: $25 - $49 /hr
Ideal clients: Mid-sized companies or enterprises seeking to augment in-house teams with local, high-quality talent.
Why hire them: Lexis Solutions offers dependable, budget-conscious development with a focus on mobile excellence, making them a strong choice for projects requiring efficiency and reliability.
3. Uplanet (Bulgaria / USA / Ukraine) — eCommerce and Product-Centric Apps
Why #3: Uplanet operates development hubs in Bulgaria while serving a global client base, including US and European markets. Their portfolio emphasizes eCommerce, web-to-mobile platforms, and AI-enhanced features, with a focus on productized solutions. Their global presence and full-cycle development expertise are well-documented in directories like DesignRush.
What they do best:
- eCommerce applications
- Web & mobile development
- Productized solutions (e.g., indoor navigation, streaming)
- Location: Sliven, Bulgaria
- Team Size: 50 - 249
- Hourly Rat: $25 - $49 /hr
Ideal clients: Retailers, eCommerce brands, and businesses needing both off-the-shelf modules and custom integrations.
Why hire them: Uplanet's cross-border operations and eCommerce expertise make them ideal for clients seeking scalable, product-focused apps with global market applicability.
4. MentorMate (International with Bulgarian Presence) — Enterprise-Grade Apps
Why #4: MentorMate, with its strong Bulgarian engineering base, serves large enterprise clients across multiple regions. Renowned for robust UX, mobile engineering, and long-term support, they are a frequent feature in Bulgarian app developer directories.
What they do best:
- Enterprise-grade native mobile apps
- Long-term maintenance and support
- Comprehensive UX design
- Location: Minneapolis, MN; Sofia, Bulgaria; Asunción, Paraguay
- Team Size: 1,000 - 9,999
- Hourly Rat: $50 - $99 /hr
Ideal clients: Large enterprises and regulated industries requiring stringent SLAs and ongoing support.
Why hire them: MentorMate's global reach and enterprise focus ensure reliable, scalable solutions for complex, high-stakes projects.
5. ScaleFocus (Sofia) — Digital Transformation and Complex Systems
Why #5: ScaleFocus is a leader in digital transformation, specializing in complex web and mobile systems, cloud migrations, and integrations. Their expertise suits high-budget projects for enterprises looking to modernize legacy systems.
What they do best:
- Complex system integrations
- Large-scale digital transformation
- Enterprise SaaS solutions
- Location: Sofia, Bulgaria; Skopje, North Macedonia; Istanbul, Türkiye
- Team Size: 250 - 999
- Hourly Rat: $50 - $99 /hr
Ideal clients: Enterprises and public sector organizations needing modernized systems with new mobile or UI layers.
Why hire them: ScaleFocus combines deep technical expertise with strategic transformation capabilities, ideal for large-scale, mission-critical projects.
6. Quanterall (Varna) — UX-Driven Product Engineering
Why #6: Quanterall is recognized in top directories for its design-led approach and dedicated product teams. They prioritize usability and polished UX, making them a go-to for consumer-facing applications.
What they do best:
- UX-focused native apps
- Product design and iterative development
- Consumer-centric engineering
- Location: Varna, Sofia, Bulgaria
- Team Size: 50 - 249
- Hourly Rat: $50 - $99 /hr
Ideal clients: Startups and businesses needing market-ready, user-friendly designs.
Why hire them: Quanterall's emphasis on UX and iterative development ensures visually appealing, user-centric products that resonate with target audiences.
7. BGO Software & The Digital Health Lab (Sofia) — Healthcare and Compliance Experts
Why #7:BGO Software specializes in digital health and regulated industries, combining app development with deep domain knowledge. Their focus on compliance-driven solutions earns them a spot in Bulgarian directories as a niche leader.
What they do best:
- Healthcare-focused apps
- Secure, compliance-driven solutions
- Domain-specific product development
- Location: Sofia, Bulgaria; London, England
- Team Size: 50 - 249
- Hourly Rat: $50 - $99 /hr
Ideal clients: Healthtech startups and healthcare providers needing regulatory-compliant engineering.
Why hire them: BGO's expertise in healthcare and compliance ensures secure, reliable solutions for sensitive industries.
8. Flat Rock Technology (Varna) — Scalable Engineering for Growth
Why #8: Flat Rock Technology is a reliable choice for scaling web and mobile products, frequently listed in regional directories. Their engineering teams excel at performance optimization and scaling infrastructure.
What they do best:
- Scalable backend infrastructure
- Cross-platform mobile apps
- Performance optimization
- Location: London, England; Varna, Ruse, Burgas, Bulgaria; Budapest, Hungary; Tbilisi, Georgia
- Team Size: 250 - 999
- Hourly Rat: $50 - $99 /hr
Ideal clients: Growth-stage startups and businesses transitioning to larger-scale operations.
Why hire them: Flat Rock's robust engineering capabilities support products poised for rapid growth and scalability.
9. Futurist Labs (Sofia) — Agile Teams for Rapid Development
Why #9: Futurist Labs is known for its nimble, flexible teams that deliver quick product cycles. Frequently featured in directories, they offer strong value for MVPs and iterative releases.
What they do best:
- Minimum Viable Products (MVPs)
- Iterative native app development
- Proof-of-concept builds
- Location: Sofia, Bulgaria
- Team Size: 10 - 49
- Hourly Rat: $50 - $99 /hr
Ideal clients: Early-stage startups and teams needing to validate product ideas quickly.
Why hire them: Futurist Labs' agility and cost-effectiveness make them ideal for fast-paced, budget-conscious projects.
10. Donatix / Web Motion (Multiple Locations) — Balanced Mid-Sized Solutions
Why #10: Donatix, Web Motion, and similar mid-sized Bulgarian firms provide a balance of affordability, technical quality, and senior leadership involvement. Frequently listed on Clutch and GoodFirms, they deliver predictable outcomes for small to medium enterprises.
What they do best:
- End-to-end app development
- CMS integrations
- eCommerce-driven mobile apps
- Location: Sofia, Bulgaria (for Donatix; similar for Web Motion)
- Team Size: 10 - 49
- Hourly Rat: $50 - $99 /hr
Ideal clients: Small to medium enterprises seeking long-term development partnerships.
Why hire them: These firms offer cost-effective, high-quality solutions with hands-on leadership, ensuring reliable delivery without enterprise-level costs.
Methodology: How These Companies Were Selected
The ranking was compiled using up-to-date developer directories (e.g., Clutch, GoodFirms, DesignRush, TechBehemoths) and company profiles, with emphasis on:
- Market presence: Consistent appearance in reputable directories.
- Service clarity: Well-defined offerings (e.g., mobile-native, AI, eCommerce).
- Client focus: Specialization in verticals like healthcare, retail, or enterprise.
- Delivery capacity: Team size, project history, and case study availability.
Rankings prioritize fit-for-purpose recommendations over arbitrary directory scores, ensuring alignment with diverse project needs.
How to Choose the Right Bulgarian Development Partner
- For AI-driven or product-first projects: Engage Uran Company for their AI expertise and end-to-end product engineering.
- For eCommerce with global reach: Uplanet's cross-border experience and productized solutions are a strong match.
- For enterprise transformation: ScaleFocus or MentorMate offer the scale and support needed for complex migrations.
- For rapid MVPs on a budget: Futurist Labs, Donatix, or Web Motion deliver value and speed for early-stage projects.
Other Notable Bulgarian Competitors
Beyond the top 10, Bulgaria's tech ecosystem includes niche players like Geniusee (fintech), ROCKETECH (IoT), Accedia (system integration), and MyApp.BG (mobile specialists). These firms cater to specific verticals or technologies. To find the best fit, shortlist 3-5 companies, conduct a technical assignment or paid sprint, and verify references before committing to a long-term partnership.
Final Thoughts
Bulgaria's app development landscape in 2025 offers diverse, high-quality options, from AI-forward innovators like Uran Company to eCommerce specialists like Uplanet and enterprise-focused firms like ScaleFocus. The ideal partner depends on your project's complexity, regulatory requirements, and partnership goals. Start by defining clear product outcomes, requesting relevant case studies, and using a short discovery sprint to validate team compatibility before scaling development.
