At 4xxi, we specialise in launching startups and crafting exceptional products that revolutionise industries and transform lives. Our philosophy revolves around creating products that truly make a difference. With over 15 years of experience, we've collaborated on world-class projects, and our clients have raised over $500M+.

Our services include:
- Backend Development
- Frontend Development
- DevOps
- AI/ML Solutions
- Mobile Development

Under-the-hood:

- ⏳ 12+ years on the global markets (🇺🇸, 🇬🇧, 🇻🇬, Asia, Eastern & Western Europe)
- 🗞 Publications about our client in TechCrunch, Forbes, Business Insider, NY Times, Wired
- 🏅 Became "Top #2 Web Development Company in the world" (c) Manifesto
- 🏪 HQ in London
- 🚀 100+ completed projects we are proud of
- 🧗♀️ Own awesome Startup Competitions in London in partnerships with WeWork, Barclays, F6S, 11FS, Capital Enterprise, VCs

4xxi

Evgeny Smirnov

This department focuses on building and maintaining the server-side logic and infrastructure for web applications.

Backend Development

This department oversees international market strategies and financial operations.

4xxi

Org chart

Teams

Backend Development

Global Markets

Offices

4xxi

Org chart

Teams

Backend Development

Global Markets

Offices

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