What Selleo does

Selleo is a Poland-based software development company founded in 2005 and headquartered in Bielsko-Biała, operating under the legal entity Selleo Labs spółka z o.o. The company sells custom software development, dedicated development teams, staff augmentation, MVP development, product discovery, DevOps, UX/UI design, mobile development, QA, and—since 2024—a distinct AI Agent Development and AI Product Development service line. Its technology stack centers on React, Node.js (including NestJS), React Native, Ruby on Rails, Ember, and Python, with cloud-native, API-first architecture. The firm has accumulated vertical expertise in EdTech and HRTech, supporting named customers such as Humly, Alyne, Defined Learning, Northpass, SquadLocker, Neutopia, and Studentvikarie across Europe, North America, the Middle East, and Oceania.

The company's most visible proprietary product is Mentingo, an AI-first Learning Management System offering personalized learning journeys, GPT-based assistants, and an AI Mentor in Teacher, Mentor, and Roleplay modes, available as open-source, SaaS subscription, or custom white-label; a white-label go-live is reported achievable in 7 days. Adjacent HRTech modules cover Performance Management, Time & Attendance, Payroll, Talent Management, Applicant Tracking, and HRIS, with integrations to Microsoft Teams, SSO, accounting, and Google Play/App Store distribution channels. Selleo has not disclosed external funding and appears to operate as a bootstrapped, founder-led private company under CEO Dawid Pośliński and CBO Dariusz Wylon.

Revenue derives primarily from professional-services engagements (project-based and retainer/hourly billing for senior full-stack developers and tech leads) supplemented by Mentingo SaaS subscriptions and an emerging AI-integration stream. The company positions itself as a 'product partner' rather than a ticket factory, differentiated by ISO 27001 and ISO 22301 certifications, AWS/ISTQB/Scrum-credentialed staff, a 4.7/5 Clutch rating, an average 4.5-year client tenure, and Forbes Diamonds 2025 recognition.

Name

Selleo

Legal name

Selleo Labs spółka z o.o.

Website

https://selleo.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

11–50 employees

Short description

Selleo is a Poland-based software development company founded in 2005 offering custom software development, dedicated teams, and an AI-first LMS product (Mentingo), with deep vertical expertise in EdTech and HRTech serving enterprise and mid-market clients across Europe, North America, and select MENA/Oceania markets.

Ownership category

akta.pro rank

Headquarters

HQ city

Bielsko-biala

HQ country

Poland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Staff Augmentation / Dedicated Teams: Providing dedicated developers, designers, and tech leads that integrate with client teams. Revenue generated through hourly or monthly retainer fees for team members.
2. Custom Software Development: Full-cycle product development from MVP to scaling. Typically project-based or milestone-based engagement with clear phases: pilot, rollout, optimization.
3. SaaS Product Development: Building and scaling SaaS products for founders and companies, including product discovery, architecture, and ongoing development.
4. AI Integration Services: Adding AI features to existing products - from early prototypes to full-scale implementations, integrating with existing infrastructure.
5. Mentingo LMS Platform: AI-powered LMS delivered as Open Source (free to use and modify), Subscription-based SaaS, or Custom-built. Generates recurring revenue through SaaS subscriptions.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels10 records

Core offering

Selleo is a Poland-based software development house that designs, builds, and scales custom web and mobile software for B2B clients, with deep specialization in EdTech, HRTech, and SaaS products. The core offering combines full-cycle product development (discovery, UX/UI, engineering, DevOps, QA) with staff augmentation via dedicated senior full-stack developers, plus AI integration and AI agent development services. The firm also operates its own AI-first LMS product, Mentingo, delivered as open source, SaaS, or custom white-label.

Product overview

Selleo is a Poland-based software development company (founded 2005) offering a combination of custom software development services and proprietary product modules. Its service portfolio spans custom software development, DevOps, SaaS development, UX/UI design, AI solutions, QA, staff augmentation, and software outsourcing. Within its product suite, Selleo has developed Mentingo, an AI-first Learning Management System available as open-source, SaaS, or custom white-label, which serves as both a standalone product and a demonstration of the company's LMS development capabilities. Supporting modules include Performance Management Software, Time & Attendance Software, Payroll Software Development, and Talent Management Software (with Applicant Tracking System), all designed to integrate with one another and with external HRIS, SSO, payroll, accounting, and Microsoft Teams systems. Selleo also publishes the Developer Path Framework as a public career development resource for engineering teams.

Differentiator

Problem solved

Functional benefit

Brands

• Mentingo: AI-first LMS (Learning Management System) that personalizes learning paths, automates content generation, and engages learners through intelligent assistants
• Developer Path

Products and services

• Mentingo LMS AI-first Learning Management System built by Selleo's EdTech team, delivering personalized learning paths, GPT-based AI assistants for course and quiz generation, and an AI Mentor with Teacher, Mentor, and Roleplay modes. Offered as open-source (self-hosted), SaaS subscription managed by Selleo, or custom white-label build for organizations that want their own branded LMS.
• Custom Software Development End-to-end custom software development services covering discovery, design, development, testing, and launch for web and mobile platforms. Targeted at B2B clients in EdTech, HRTech, fintech, healthcare, real estate, e-commerce, and SaaS.
• SaaS Development Design, build, and scale SaaS products for startups and scaleups with clean architecture, robust infrastructure, and long-term maintainability. Includes product discovery and ongoing development support.
• Staff Augmentation (Dedicated Development Teams) Embedding experienced backend, frontend, DevOps, QA, data, and AI specialists into client teams to scale engineering capacity on demand. Free 2-week developer trial is offered before commitment.
• DevOps & Cloud Services Cloud infrastructure setup, CI/CD pipelines, deployment automation, and observability for reliable, secure releases, leveraging AWS-certified team capabilities.
• UX/UI Design User experience research, wireframing, prototyping, high-fidelity UI design, usability testing, and WCAG accessibility compliance.
• Mobile Development Native and cross-platform mobile app development, including React Native, with secure authentication and role-based access for iOS and Android.
• MVP Development Rapid MVP delivery combining product discovery, scope definition, and senior-engineer-led build to validate ideas and reach market quickly, with full code ownership.
• Product Discovery Upfront discovery and scoping to define requirements, priorities, success metrics, and technical feasibility before development begins.
• Software Outsourcing Dedicated development teams and outsourcing engagements for full-cycle product delivery, available globally across multiple country markets (UK, US, DACH, Scandinavia, Australia, Canada, Saudi Arabia, Belgium, Ireland).
• Software Quality Assurance Comprehensive QA and testing services including regression testing, acceptance criteria gates, and audit trail coverage for compliance-sensitive systems. ISTQB-certified testers.
• Artificial Intelligence Solutions AI integration and AI agent development services for embedding production-ready AI features into existing products, covering model deployment, vector databases, MLOps, and AI product development. Includes AI Product Development and AI Agent Development sub-services.

Quantifiable outcome

• 4.7/5 rating on Clutch from client reviews
• +4 more outcomes

Named customers15 records

Segments5 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration7 records

AI capability8 records

Feature3 records

Scale indicators5 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• BinarApps: Polish software development agency providing web/mobile apps, SaaS, and MVP development for startups and enterprises. Overlaps with Selleo on services and Poland-based delivery.
• ELEKS: Large Eastern European software development and IT services firm offering custom software, data, and QA across multiple verticals. Directly comparable on services portfolio and target market, with broader scale.
• RubyGarage: Polish software development company specializing in Ruby on Rails, React, and Node.js with dedicated team and product development services. Comparable on tech stack emphasis and staff-augmentation model.
• Netguru: Polish software development and consulting house of similar scale, offering custom web/mobile development, AI, and product discovery to enterprise clients across Europe and the US. Directly comparable on services portfolio, size, and GTM.
• Infinum: Croatia-based (Central/Eastern European) software development company providing custom software, product design, and QA for enterprise and SaaS clients. Highly comparable on services mix, region, and target buyer profile.
• Brainhub: Polish full-stack software development house offering dedicated teams and custom product development using React, Node, and Ruby on Rails. Overlaps with Selleo on tech stack, delivery model, and mid-market/enterprise customer focus.
• Clearcode: Polish software house focused on adtech, SaaS, and custom product development with strong AWS/cloud capabilities. Comparable on services, Polish base, and engineering-led delivery for global clients.

Broad incumbents

• SoftServe: Large Ukrainian-headquartered IT services and digital transformation company with broad vertical coverage. Comparable on custom development and staff augmentation, but operates at much larger scale and broader portfolio.
• EPAM Systems: Global IT services and custom software development firm with deep Eastern European engineering roots. Comparable on core custom development and staff augmentation, but at materially larger scale and broader industry coverage.
• Ciklum: Global digital services company headquartered in Denmark with major delivery centers in Ukraine and Eastern Europe. Comparable on staff augmentation and custom development, with a broader geographic and vertical footprint.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/selleo
• YouTubeyoutube.com/user/SelleoWebMobileTV
• Facebookfacebook.com/MiksturaIT
• LinkedInlinkedin.com/company/selleo
• Instagraminstagram.com/team_selleo

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Selleo