AI Legal Guidance for the American Arbitration Association
A small team
that moves fast
and gets AI right
Founded by a scientist. Built by engineers who’ve been working together since 2008. We dive into your industry — fintech, legal, education — before we write a line of code. 100+ products shipped, and we take responsibility for every one.
- RAG & LLM systems
- AI agents & automation
- Web & mobile apps
1–5
Days to start
$500M+
Raised by our clients
15+
years of experience
Innovating Wealth Management
AdvisorEngine
Redefining Incident Management
GroupDoLists
Transforming Running Experience
HumanRace
How we work?
Step 1: Research & Development
We thoroughly assess your idea, analyze competitors, and identify core differentiators. Our team designs a comprehensive list of features to ensure your product stands out in the market.
Step 2: Planning & Design
We create a core roadmap and user flows for your project. Our experts collaborate with you to understand your vision and translate it into a well-defined plan, ensuring a smooth development process.
Step 3: Development
Our small, but skilled team brings your idea to life by developing a minimal viable product. We find a balance between functionality, usability, and scalability to deliver a high-quality product that meets the idea.
Step 4: Launch
We handle the entire process of packaging your product for a successful launch. From optimizing performance to ensuring a seamless user experience, we make sure your product is ready to make a strong impact in the market.
Ready!
Step 5: Presentation
We assist you in effectively presenting your product to potential investors, stakeholders, or customers. Our team helps you craft compelling pitches and demonstrations that showcase the unique value of your offering.
Step 6: Transfer or Maintenance
After launch, we offer options to either transfer the project to your team (and help you to build one if necessary) or provide ongoing maintenance and support. We ensure a smooth transition or provide reliable maintenance services to keep your product running smoothly.
Done!
Why work with us?
- 1
Experienced and Cohesive Team
Our small and focused team has been working together for over 10 years, bringing a wealth of experience and a seamless collaboration that ensures exceptional results for your project.
- 2
Rapid Development
We understand the importance of speed without compromising quality. Our agile approach allows us to deliver your web and mobile app projects swiftly, ensuring quick market entry and a competitive edge.
- 3
Comprehensive Expertise
With our all-in-one approach, we provide expertise in development, marketing, and sales. From crafting exceptional code to implementing effective marketing strategies and driving sales, we offer a holistic solution for your startup's success.
They write about the projects we have built
What Our Clients say?
Their passion, their energy, and their youthfulness impress me. Their management and leadership are senior, which is a good thing, but the development team is composed of younger, hipper, smarter, cutting-edge application users who are able to transfer ideas from cool apps and implement those ideas.
Michael Sher
CEO, GroupDoLists
Our team feels that 4xxi is incredibly responsive, dedicated and smart. When something is not clear, they ask the right questions. I have been particularly impressed with the skills of the lead engineer, the architect, and project manager being able to take a business requirement and really turn it into technical specs.
Emily Jipson
General Manager, WorthFM
They did a great job. The biggest challenge for me when outsourcing, was that I was outsourcing. 4xxi is not an in-house team, but they were phenomenal. I definitely needed people who could help 4xxi understand what’s going on, but there was never a question of them not being able to deliver against what was being put in front of them.
Gayle Meyers
CEO, IndustryIndex
They are a fantastic team and we wouldn't be where we are today without them!
Josh Lewis
Director & Co-Founder, Challenge Social
I’ve been working with them for 15 years. I’ve known them for a long time. ... I haven’t given them a project yet that they couldn’t handle… they’ve always delivered.
David Nadezhdin
Founder, Circus Intersection
I’ve been very happy with 4xxi. They deliver on time. So far, new and complex features are delivered according to our specifications.
Trivago Team
Product manager, Trivago
Working with the team has been one of the best commercial experiences of my business life.
Steven Emanuel
President, Emanuel Quant Services
They have confidence in the IT, education, and financial area, which is impressive. It’s been a really good relationship so far, and we consider them partners.
Konstantin Seregin
Manager of Digital Projects, Smart School
They take what they do seriously, doing things well so they can be proud of the work. Based on our 5 years of experience together, they’ve always taken the product as a challenge. They brought ideas and asked why we wanted to do it in a certain way. If I were building a new product, I would definitely get their feedback since I respect their opinion a lot. They are generally a good team to work with. ... They builds software to their own quality standards, which are high even compared to Silicon Valley.
Sergey Fedorov
Director of Product, AnchorFree
Made with ❤ by 4xxi
Beyond client work, we build and launch our own products — from idea to production. Here are some of them.
AI-powered dream interpretation rooted in Jungian psychology. Explore the symbols and meanings behind your dreams.
individuate.me
A personality test based on narrative psychology. Tell your life story and discover how you make meaning.
whatsmyarc.com
M
arginalia
Expert-curated scientific digests. Domain experts review and annotate academic papers for a broader audience.
readmarginalia.com
Accounting and tax compliance for Serbian lump-sum entrepreneurs. Invoices, KPO ledger, and tax tracking.
preduzmi.com