Independence is the difference.
We are a software consultancy. Our purpose is to benefit our clients — their people, products, and services.
Our core strengths are software development, technology strategy, and UI/UX design. Our difference is a peerless capacity to safely and reliably deliver solutions on-time and on-budget.
Founded in 2002, we’re headquartered in New York City, and supported by a global team of talented professionals committed to building things of lasting value.
Benefit from our hyper-competent software development, insight-driven strategy, and award-winning design practices. Morgan Stanley benefited. As did AIG, FreshDirect, HP, and hundreds of other organizations.
Examples of what we do:
- Design and build high-performance, complex software — software that optimizes and runs departments or entire organization.
- Design and build transactional portals that connect you with your customers, suppliers, affiliates, or staff.
- Create transformative digital strategy that accelerates your organization’s objectives.
We bring empathy, creativity, and collaboration to all of our client relationships.

headquarters
other locations
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Ukraine
Focus
Portfolio
AIG, Everest, HP, Freedom Mortgage, Stillwell-Hansen, Hamilton, FreshDirect, Attune, Clinique, Morgan Stanley, Coty

Knowify SaaS ERP for Contractor Firms
Full lifecycle job management software for contracting and service professionals
DOOR3 partnered with Knowify’s founding team to create the initial version of the Knowify platform.
Knowify enables its customers to quickly and easily manage their project workflows across all their devices all with a world class user experience.
Just some of the features of the software include:
Bids and Estimates
Materials Costing, Ordering, and Tracking
Budget Management
Contract Management
Time Tracking & Scheduling
Reporting and dashboards
Fully Integrated with Quickbooks

Qello Historical Concerts
DOOR3 partnered with Qello to develop:
We partnered with Qello over several product generations to provide wraparound service from digital strategy and software architecture through design and development of:
- Online video streaming application
- Multi-device – Tablet, Smartphone & TV
- Web, iOS, Android, Samsung, Google apps
- Top app in the store
- Transactional (commerce)
- Advanced video integration
- Powerful social media integration
“DOOR3 has consistently shown themselves to be ahead of the competition . . . DOOR3 and delivering on promise should be considered synonymous.”
- Matt Carona, VP of Product and Business Development, Qello

Elsevier - Knovel Redesign
Elsevier hired DOOR3 to re-design Knovel, their premier product for the chemical engineering industry. This project employed an iterative approach that put users – and experience - first.
This means we began the project brainstorming all possible features... then talking to actual customers to hear their thoughts on which features they found valuable.
Based on these conversations we were able to prioritize these features and as a next step, we created simple wireframes for customers to review – ‘testing’ our feature assumptions.
After each design iteration, returned to these customers and obtained feedback on the designs. Once wireframes and requirements were tightly defined, we moved into visual design.
DOOR3's work with Elsevier earned us the coveted WMA WebAward for outstanding achievement in Web development.

Coty Drupal Framework Architecture and Development
Marketing's IT Partner
Developed "CotyCore," a standardized framework on top of DrupalCore in order to enable high-volume, economical deployment of marketing sites and microsites for Coty's brands across multiple marketing activations and geographies (including regulatory requirements, laguage and localization, etc.)
40+ brands (with multiple microsites) – standardized on single CMS, Web and mobile projects
Best practices oversight
Architecture
User experience
Mobile solutions
Code review, support, enhancements and upgrades
Agency regulations
Roadmap planning / FY IT planning
External and internal projects

Kasina WalletShare
FinTech Product Development for Data Visualization & Reporting
UX Design & Front End Implementation with API Specifications for new product development.
Created a centralized data storage and presentation solution for multiple structured data sources.
Applied best practices to create a set of data management and presentation interfaces.

AIG - Data Visualization System
DOOR3 created high-quality data visualization and dashboarding best practices for the firm’s new evidence-based department, AIG Science.
AIG is an American multinational insurance corporation serving 98% of Fortune 500 companies. AIG’s Science Team is made up of statisticians, computer engineers, and modelers who create automated solutions that address business strategies with available data. DOOR3 developed a standardized design and technology approach to optimize usability and accessibility for business critical dashboards created by the department. Deliverables- Best practices for data visualization and dashboarding
- Information architecture & interaction design best practices
- Brand & style guidelines
- Reusable code framework
- Consistent and user-friendly visual design applicable to all AIG dashboards
- One dashboard designed by DOOR3 is growing to become a business critical application across all AIG departments
Reviews
the project
Enterprise Software Development for Housing Non-Profit
"DOOR3's understanding of the business and the speed at which they understood the business was really impressive."
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Please describe your organization.
The company was a not-for-profit affordable housing company.
What is your position?
I was the CIO.
What business challenge were you trying to address with DOOR3?
This was before the housing market crashed, and we were experiencing a real spike in mortgages and applications and things like that. We just couldn’t keep up with the paper-based system, so we were looking to automate that whole thing and get better reporting out of it, better statistics, data, that kind of thing.
Please describe the scope of their involvement in greater detail.
They did the whole thing soup to nuts. DOOR3 came in; they did the requirements gathering, the design, they built it and they did the testing. They really did the entire scope of the project. It was a long project. Like most things, you built it and then you realize you want something more. We worked them for probably about three years and really what stopped it was the market turning around. We built a system for a business that was going up, and then all of a sudden, the business went down, and we had this really big system for something that we could actually handle on paper again. That’s what stopped the engagement.
I believe it was written in .NET, so in C#. It used pretty much the whole Microsoft stack: SSRS, SSIS, all that kind of stuff for reporting. It integrated with our existing mortgage management system. It really did a lot of things. It was really like a full ERP system almost by the time we ended because we built it for one specific area of the business and then other areas wanted it too.
The most useful feature, though, was definitely the closing board. It tracked mortgage applications and seeing which applications were coming in from which mortgage officer and for how much so we could see if they were meeting their goals and things like that. We could see what was in the pipeline coming along so we could tell what we were going to have in three months, six months, or nine months. The system that we had handled permanent loans very well, but it didn’t handle construction loans very well. That was one of the key things that we used it for, being able to see exactly how much an advance should be and to whom and when and being able to report on that. All of this was done on paper and Excel previously. To figure out how much money you actually dispersed and to whom and for what and for which loans and things like that were really difficult prior to this. It’s pretty hard to run a mortgage company when you don’t know who you’re giving your money to.
It was really revolutionary. Especially in our company, we were a small not-for-profit community-based lender, and we got pretty big pretty fast.
How did you come to work with DOOR3?
They were referred to us. It was our first big development project, so we definitely made some mistakes along the way, but they were there the whole time. They really helped us in every aspect of the development.
Could you provide a sense of the size of this initiative in financial terms?
It was several million. Basically, we outsourced our development to them. It was multiple smaller projects, but over the course of three to even four, five years, it was many millions.
What is the status of this engagement?
It’s completed.
Could you share any statistics or metrics from this engagement?
Nothing specific just because it was a while ago and I don’t remember. This was five to eight years ago.
How did DOOR3 perform from a project management standpoint?
Good. I was very happy with DOOR3. That was a project in and of itself, getting the right project management reports. We ended up building a project management tool just so we could see things in the way that my boss wanted to see them exactly.
What distinguishes DOOR3 from other providers?
One thing that many of my end-users and my subject matter experts commented on was just how quickly they picked up the business side of things, which is really important. DOOR3 were really good at the business requirements. I would say that’s probably their strongest suit. Multiple senior vice presidents came to me and said they were really impressed.
The first project that we did before we wrote any code is we did a bunch of dataflow diagrams and things like that just to really map out how the business works, and we used those things even outside of the software development project. That was a really useful tool. One of the things we discovered was one department would print out a form and walk it over to another department and hand it to them, and then they would scan it and save it in another directory. It was just ridiculous, unnecessary work that was going on that was uncovered by these guys. They didn’t have to do anything to fix it; we just told them look, just save a copy in this other folder. DOOR3's understanding of the business and the speed at which they understood the business was really impressive. I would say that was their number one quality for me.
Is there anything DOOR3 could have improved or done differently?
We took a while to get up to speed I would say, and I don’t think it was really their fault; it was really we had never done a development project before. Looking back on that whole project, if I were to do anything differently, it would be just to know what I was getting into before I got into it.
Again, that wasn’t really a knock on them. They would give their advice and then just the customer is always right kind of thing.
the project
Full-Service Web and Mobile Dev for a Museum
"DOOR3's development work provided a modern digital experience for our audience."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
I lead digital strategy and initiatives for a major museum in New York City.
For what projects/services did your company hire DOOR3?
We needed DOOR3 to redesign our mobile-responsive website and develop an app with a digital ticketing function.
What were your goals for this project?
We wanted to outsource web and mobile development.
How did you select this vendor?
We evaluated their proposals against comparable firms. For their proposals, they went above and beyond to understand our organization.
Can you go into detail about the services they provided and the scope of the project?
DOOR3 offered end-to-end software development services include design, development, and testing.
What was the team composition?
We worked with a project manager, account manager, designers, developer and testers.
Can you share any information that demonstrates the impact that this project has had on your business?
DOOR3's development work provided a modern digital experience for our audience.
How was project management arranged and how effective was it?
Their account manager and project manager achieved what I was looking for in administration, escalation, and problem-solving.
What did you find most impressive about this company?
They resolved issues as they arose.
Are there any areas where they can improve?
There are things to improve in every organization. I would suggest a focus on scaling as they continue to grow.
the project
ERP Vendor Comparison for Elevator Provider
"They are as good as it gets in this arena."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
I am the director of IT of TEI Group. We are an elevator construction, modernization, repair, and service company.
For what projects/services did your company hire DOOR3?
We were deciding between two ERP products. We brought in DOOR3 to determine which would be a better fit for our company.
What were your goals for this project?
We engaged DOOR3 to provide a vendor and product comparison of ERP providers.
How did you select this vendor?
I learned about the team through a mutual colleague in the industry.
Describe the project in detail.
DOOR3 held briefings with each vendor and then wrote summaries weighing the pros and cons of each product.
What was the team composition?
We worked with one person.
Can you share any outcomes from the project that demonstrate progress or success?
DOOR3 brought much-needed clarity to our decision-making process.
How effective was the workflow between your team and theirs?
The partnership was excellent.
What did you find most impressive about this company?
Their ERP expertise was very thorough.
Are there any areas for improvement?
No, we were very happy with their work.
the project
Digital Transformation for Auction Business
"Their expertise, creativity, and collaborative approach were all impressive."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
I am the Head of Solution Delivery & Transformation Programme Director at an art auctioneer.
For what projects/services did your company hire DOOR3?
We wanted them to perform a complete digital transformation for us.
What were your goals for this project?
We hoped the work would transform our interactions with customers, prospects, and agents to provide a world-class user experience across all channels and geographies.
How did you select this vendor?
They were recommended by a partner.
Describe the project in detail.
It was a multi-million-pound project that took place over 5 years and transformed all aspects of the business. Our aim was to retain our unique and historical reputation while moving towards more modern ways of interaction that was being demanded by customers. The overall program delivered online marketing and customer interaction tools as well as enterprise HCM, CRM, auction management, finance, treasury, and ERP solutions. All of these were rolled out globally.
What was the team composition?
The team had 40 to 50 team members in total, which included 5 from Door3. The team included consultants from one of the big 4 consultancies, a couple of system integrators and solution vendor staff, in addition to as my company's staff.
Can you share any outcomes from the project that demonstrate progress or success?
The project was delivered successfully.
How effective was the workflow between your team and theirs?
Their team maintained excellent communication and interaction throughout the project.
What did you find most impressive about this company?
Their expertise, creativity, and collaborative approach were all impressive.
DOOR3’s work was revolutionary and innovative, helping the organization reach the next level within their industry. The agency was able to understand the business climate quickly, which helped cut down on costly and time-consuming learning curves.