Monterail

Monterail is a software development agency founded in 2010 in Wrocław, Poland. The company has 130+ in-house experts across engineering, design, and product, and has completed over 900 projects globally. It works with startups, scaleups, and enterprises across healthtech, fintech, proptech, HR tech, and retail—including clients like Merck, Pizza Hut, Flink, Cooleaf, and SharkNinja. The agency positions itself as "AI-native," meaning it integrates AI-assisted development into its workflow rather than offering it as a separate service. Its current NPS is 71.

Monterail was recognized as one of the fastest-growing tech companies in Central Europe by Deloitte in 2016 and 2017, and listed in the Financial Times 1000 in 2018. In 2019, it secured an official partnership with Vue.js; in 2024, it became an official Nuxt partner. Since 2024–2025, the company has acquired three agencies: Untitled Kingdom (a MedTech software and product development firm), ElPassion (product design and development), and Lakeview Labs (a startup-focused app development shop). This suggests a strategy of expanding capabilities and deepening vertical expertise, particularly in healthcare.

Services and capabilities

Monterail offers end-to-end product development: discovery, product design, web and mobile development, and ongoing support. It handles both greenfield builds and scaling of existing products.

Web development covers high-traffic platforms and SaaS products using modern frameworks. Mobile development spans native iOS and Android as well as cross-platform solutions. The company emphasizes UI/UX throughout both: Cooleaf's co-founder noted that "customers love Monterail's design. They praise the app for being performant and super-slick."

Product design involves user research, ideation, prototyping, and MVP validation. The agency has shipped clickable prototypes and development-ready designs for medtech startups (e.g., Infinant Health for infant gut-health monitoring, Matrix Health & Care for pelvic assessment devices). It also offers "dedicated AI implementation"—deploying ML models, natural language processing, and data-driven automation—though the source does not detail specific AI project outcomes.

Core tech stack: Vue.js (official partner), Ruby on Rails, React Native, Flutter, and Node.js. Oracle is mentioned in several healthtech projects. The agency works across regulated (healthcare, fintech) and consumer-facing (e-commerce, travel) environments.

Notable work

Merck partnership on a diabetes-management web app expanding to eight African markets with multiple language versions. Cooleaf (an HR-tech platform) scaled from startup to 110,000+ users across 103 organizations over a 12-year partnership. Seat Unique, a premium ticketing marketplace, was described as "the 3rd fastest-growing consumer startup in Europe" after Monterail evolved it from an initial MVP.

Flink, an online grocery delivery app, had its platform rewritten by Monterail to handle "massive pandemic-driven growth." Pizza Hut saw a rebuilding of its web ordering app that "raised conversions by 30% in the Polish market."

In healthtech specifically, Monterail has shipped prototypes and MVPs for Convatec (Apple Watch heart-rate variability data collection for clinical trials), Emm (smart menstrual cup with data analytics), Lyv (endometriosis care app), Spoke (multi-award-winning mental health and music therapy app), Elvie Trainer (pelvic floor device with native mobile apps), MindMics (medical earbuds for vital signs monitoring), and Vave Health (wireless ultrasound platform that conducted 1M+ scanning sessions and won six awards). Most of these were startups; many are described as award-winning or clinically validated.

How they work

Monterail describes its approach as combining product strategy, design, and engineering to ship "production-ready software that supports real business growth." The company emphasizes measurable outcomes and transparent communication. Clients report speed and reliability: Pizza Hut's product owner said Monterail "managed to deliver a business-critical feature with an insanely short time – while also ensuring high quality." Merck's Head of Digitization Africa noted that "working with Monterail feels much more like working with your own team."

The agency operates remotely and has successful partnerships across Europe and beyond. Its leadership team includes co-CEOs Szymon Boniecki and Bartosz Rega, Chief Delivery Officer Grzegorz Hajdukiewicz, Head of Technology Hubert Białęcki, and Head of Design Krzysztof Kaiser. Pricing and engagement models (fixed-price, T&M, dedicated team) are not detailed in the source.

Team and credentials

130+ in-house experts. Founded in 2010 by a team of developers in Wrocław, Poland. Official partnerships with Vue.js (2019) and Nuxt (2024). Recognized by Deloitte as one of the fastest-growing tech companies in Central Europe (2016, 2017). Listed in the Financial Times 1000 (2018). Current NPS of 71. The company has also acquired three agencies since 2024, signaling expansion in design, medtech consulting, and startup-focused development. No certifications (ISO 27001, SOC 2, GDPR/HIPAA compliance) are mentioned in the source.