Onix-Systems

Onix is a Ukraine-based custom software development and IT services firm that builds, modernizes, and rescues digital products. The company has 25+ years of combined software development experience and works with clients across travel, healthcare, fintech, edtech, and fitness sectors. Their offering spans custom development, AI integration, legacy system rescue, and ongoing support—with 82% of clients returning for additional projects and an average client retention of 3+ years.

Services and capabilities

Onix structures its work around five core service lines. Custom software development covers web and mobile apps, scalable platforms, and complex solutions. Travel and hospitality software is a named speciality: the company builds booking engines, reservation systems, scheduling tools, fraud detection, and AI-powered personalization for the travel sector. Discovery and product strategy help clients bridge the gap between business concept and technical execution. UI/UX design focuses on intuitive interfaces and workflow simplification. They also offer CRM/ERP customization and integration, 24/7 support and maintenance, and what they call "rescue" services—stabilization and refactoring of failing or stalled projects.

AI and automation are woven through much of their work. The company integrates intelligent features like smart search and recommendations into products, implements generative AI for content automation and workflow efficiency, and builds cloud-native architectures designed to scale. They develop computer vision features for visual recognition and verification tasks, and create AR/XR experiences. According to their site, 100% of recovery workflows are powered by AI.

Notable work

MisterB&B is their flagship case study: Onix delivered custom travel software development for the LGBTQ-friendly booking platform, upgrading an outdated system, integrating third-party services, and building fraud detection and secure payments. The result is 1 million accommodations across 200 countries and 900K+ members, with Forbes recognition as the "gay Airbnb."

Other projects with measurable outcomes include a digital health white-label solution (6 branded apps live across platforms), a fitness and nutrition coaching platform (rebuilt architecture, new website and mobile apps), and an AI-powered cosmetics app that analyzed 45,000+ products with an ML-driven ingredient database, reaching 100K+ users.

Golf Live, an online golf coaching app, was stabilized over 2+ years with an 8-person team. Vyra, a learning platform, grew from MVP to full-scale B2B solution over 4+ years. Adoric, a SaaS marketing platform, underwent complete product rescue after 10+ years with a bug-fix cycle. Phlex, a smart swim training tracker, went from concept to launch in 3+ years.

Client testimonials highlight specific outcomes: a 30% reduction in legacy code–related bug reports and 35% fewer critical post-launch issues on one project; another client noted the codebase became "maintainable and scalable" after refactoring.

How they work

Onix offers five engagement models. Staff augmentation adds specialists to existing teams. Dedicated team provides a remote squad focused solely on a single project. Time & materials charges for actual hours and resources used. Fixed price delivers defined scope on budget and timeline. Full-process development covers design, development, QA, and support end-to-end. The company emphasizes flexibility, positioning itself to work with startups, SMBs, and enterprises. Communication and transparency are mentioned as guarantees, and clients describe them as feeling "like an extension of our team."

Team and credentials

Onix is based in Ukraine (Kyiv and Lviv implied in source). Specific team size and founder names are not mentioned in the available material. The company cites 25+ years of cumulative software development experience and reports that 95% of clients say the team "uncovered issues their previous team missed." The firm highlights 87% of rescue audits leading to vendor change within 10 days, suggesting expertise in identifying and fixing systemic problems. No third-party certifications (ISO, SOC 2, etc.), partner badges, or awards are mentioned in the source material.