A collaborative startup software development services and solutions

  • For startups, speed to market is paramount. Whether it’s finding engineers to quickly build a proof of concept or rapidly scaling up an MVP, it’s essential to get their product in the hands of users as soon as possible, with minimal missteps.

    DOOR3 makes it easy for growing companies to access the expertise they need. DOOR3 is a startup software development specialist with extensive experience successfully launching applications at speed and scale. With our nearly 20 years in business consulting, UX design, and development, we offer startups the partnership they need to help them refine their ideas, hone their market position, and create startup software products that will delight their customers and grow their business.

“DOOR3 is a collaborative group that works with my team and not for my team. It makes a lot of difference knowing that they care about our project and are willing to cooperate with us to help meet our needs.”
Thomas Finnegan, Founder, Appsetters

Our Startup Software Development Capabilities

  • Idea Development

    If you’re just getting started, we can help you develop and mature your concept and create requirements for your product.

  • Proof of Concept

    We can take your idea and rapidly develop an MVP to get it into the market quickly.

  • Startup Development at Scale

    We can help you harden your startup software development application, build the tech infrastructure you need, and make it market-ready.

  • Barclaycard
  • Freshdirect
  • Aarong
  • IDT
  • Olympus
  • COTY
  • WWE
  • IDG
  • Time Warner
  • Elizabeth Arden
  • New Balance
  • Wells Fargo

DOOR3 Offers Software Development Services For Startups

  • Launch MVPs quickly and reliably
  • Scale POCs up to be market-ready
  • Access specialists and technical expertise quickly
  • Benefit from a consultative relationship
  • Hone their business idea and market position
  • Gain a long-term partner invested in their vision
Our Work

Native mobile app for international long distance calls

Why DOOR3?

DOOR3 is an independent technology consultancy and startup software development specialist headquartered in New York City. With nearly two decades of experience creating custom software development solutions for startups, we specialize in launching successful startup software applications quickly and scaling up digital products. We help startups hone their business and have the expertise to create smart, forward-thinking startup software development applications that will set your company up for success.

Learn More About DOOR3’s Services

“They are an extremely professional and knowledgeable company. Not only did they guide us in structuring the development process of our platform they also provided savvy advice on the strategic direction of our company, which included helping us define our niche in the marketplace. … They’re a very smart group of individuals. They’re collaborative, strategic, and intelligent. As a startup, those qualities are very important.”

Paula Balzer, CEO, gigHire

Let’s see what we can build together.

How can we help you?

Get in touch

This could be the start of something beautiful.