We want to be your Ultimate App Development Partner!

Elite Mobile Development Agency that Treats Your Product as Our Own!
We are a Top Rated Upwork Mobile Development Agency. We are also acclaimed as Top Mobile Development Agency on The East Coast Philadelphia according to Clutch.

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We’re a top tier partner

Your application is safe with us! We currently manage over 25 mobile app-based businesses. We are officially recognized as Upwork.com’s Top-Rated Mobile Developer. We’re featured in Business Insider and ranked us among the Top 3 Mobile Developers in Philadelphia & East Coast by Clutch.com.

One-Stop 360° service

We optimize the whole customer journey, right from discovery and development to testing and product growth. Our services include design, front and back-end development, database architecture, testing, launch, and product support and growth. That’s our secret sauce to providing clear, predictable & stable outcome for each application we produce.

Your Dedicated Partner

We are keen to fully understand your business and integrate into the current structure as your trusted IT department. With a long-term approach, we work on a daily basis to amplify your business with flawless software solutions.

Hands-on Experts

You will not get web developers with minimal mobile expertise to work on your products. Our developers pass the 4-step interview process and are capable of supporting you through the whole product development.

Why clients choose us as their Mobile Development Partner

Human approach, clear communication & development process, focus on your vision & rich expertise in the field – that’s Interexy

Who do we work with?


  • Validate your idea on the marketplace
  • Create a technical outline of the product from scratch
  • Clearly state the main USPs for the MVP
  • Get to the market quickly with strong IT support
  • Engage with your audience base & apply analytics for product growth

From Web to Mobile

  • Expand into $80B+ mobile industry
  • Carefully specify & project the mobile version for existing web product
  • Launch MVP at the earliest to start iterating with a test group
  • Figure out what your users love about mobile version and work on it

Enchanting an App

  • Find out the main issues that are hampering your progress in the niche
  • Improve application performance, usability, and user experience
  • Improve users’ retention rate by at least 25%
  • Rich enterprise quality level

Companies we helped build an app

What we do?

Mobile Application Development

  • Join an 80-billion dollar mobile industry
  • Build a market-winning application from scratch
  • Get advice on the best technologies specific to your business
  • Skyrocket your business growth with a flawless mobile product

Backend & Web Development

  • We take full responsibility for the products we are working on
  • We insist on providing full-scale 360° services inside our company to improve the quality of the end-product & follow our processes
  • Close front-end and back-end teams to support your product and perfect each part

User Interface & User Experience Design

  • Give your product the best chance to succeed fast, go viral, and reap large sales figures
  • Build anticipation and brand awareness with our pre-sale strategies and contest campaigns
  • Test creatives and copywriting in the most cost-effective and speedy manner with our scientific testing methodology

Our Workflow Process

From Specification & Estimation to final
product, follow our workflow from the
begining till the very end

1. Specification & Estimation

We’re thoroughly working on the preparation of a full, clear & professional SRS document for your product.

2. UI/UX Design

You cannot find a good product on the marketplace that has bad UI/UX. Our experts make sure you get a market-winning product.

3. Development

The main stage of the process – development. We take care of the product with sprints, retrospective, presentations, and product management.

4. Testing & Bug Fixing

We relentlessly test the whole product. Through each & every screen, we ensure that the product is polished and perfect.

5. Release

Final point! App Store’s publishing process might be an obstacle. With our standardized development process, it is almost a cakewalk.


We are not leaving you hanging. You get 6-12 months of guarantee and support since we are confident in our products’ quality.

Your business is in good hands

We thank every one of our clients for trusting us with their mobile projects. Here’s how they feel about collaborating with us:

Saad Saeed

Founder & CEO @ Crumb

“Within its first nine weeks, the app received 8,000 users and a 4.7-star rating. The platform is well designed and hasn’t had many bugs. Interexy LLC is fast and efficient at building new features as well as taking scope changes in stride. Expertise and responsiveness are hallmarks of their work.”

Will von Behr

Founder @ Urbs Travel

“I got an amazing product that was exactly what I envisioned when I first sat out & drew the plans. The two areas that I think where Stan & his team particularly excel: first is attention to detail (…) & secondly the kind of support they’ve provided after the app was largely complete. I’m sure the number of teams just do the bug work & leave it but they are [Interexy team] always on hand to answer any questions really at any time of day which is incredible.
So I’d encourage anyone who wants to build any sort of product to use Stan & his team. It’ll accelerate your business and make your life a whole lot easier. “

Doug Scibilia

Founder & CEO @ SQRK – Squaker

“Before choosing Interexy, I’ve hired a firm out of India – they gave me a great price, great timeline (…). And after close to a year, they told me they couldn’t get the project done.
Then I started to talk with Stan from Interexy. I hired them, they quoted me 8 weeks to get this project done, well, 8 weeks later – the project is done. Now I just have nothing but a great thing to say about the company – they were on time, great communication and just great people there. I’d 100% recommend Interexy for any web development or app development project that you have out there, they’re just fantastic.”

Jason Kelley

Founder @ MUSL

“I was always looking at where it intersects with the skill base of the team and the customer service, communication, project management. You can have a really really amazing team of talented developers and programmers but you’re going to end up spending a great deal of your time actually trying to self-manage them. Versus you have the opposite which is really good project management and really excellent communication but not so great development team. And what I’ve enjoyed working with Interexy is the fact that I get both of those pieces together and that has been very satisfactory.”

People who trust us

Mutual trust is vital when working with a development partner.
See what our other partners have to say about working with us.

Christian Marougi

COO & Co-Founder @ Vloggle, LLC

“Great work! They were able to adapt to our current codebase very well, and successfully completed all the required features. Will definitely come to them again for future projects!”

Peter Standish

Founder & CEO @ Risk Mentor

“Good builders of iOS and Android apps”

Nik Ivanoff

Co-Founder @ The Collective

“Best Developer around. Every aspect we needed, they had it covered with resources in their group, it was amazing. Cannot wait to work with them again.”
“Excellent Work, dream team to work with.”

Ernest Wolfe

CEO @ Wolfe Education Solutions

“Stan & his team are hands down one of the best developers I’ve worked with on this site. They did the job quickly with the utmost professionalism, and on top of that their code was very well documented and organized. One of the best iOS Swift developers on Upwork whom I recommend as highly as possible!”
“One of the best!! A job well done”

Armen Youssefian

Co-Founder and CMO @ ARK Behavioral Health

“Stan & his team has been very easy to work with and extremely professional from our first contact. I would strongly recommend them for IOS App Development.”

Chris Aplin

Co-Founder @ Soutboards

“Easy to work with, very knowledgeable.”

Aiden Dolores

Investment Analyst @ Strategic Global Fund

“Interexy was very good to work with. They were efficient with the completion of required tasks. Would recommend them to people looking for quality UI and UX work.”

Austin Wood

CTO @ JustHive

“Interexy team are great developers. Very good communication and easy to work with. I would hire them again.”

Patrick Azogni

Senior Devops Consultant @ Red Hat

“They did a great job and were always very available and reactive will use them again on my future projects”

Damir Anicic

Software Engineer @ FELL Group

“Great communication skills and knowledge about development of iOS apps”

Rob Gray

CEO @ Cold Storage Coins

“Really great job!”

Peter Larsen

Managing Partner @ Candor Venture Partners

“Interexy were great. Extremely responsive and easy to work with. Very knowledgeable and efficient with iOS. Will definitely use them in the future!”

Saad Saeed

Co-Founder & CEO @ Crumb

“Within its first nine weeks, the app received 8,000 users and a 4.7-star rating. The platform is well-designed and hasn’t had many bugs. Interexy LLC is fast and efficient at building new features as well as taking scope changes in stride. Expertise and responsiveness are hallmarks of their work.”

About us

Stan Sakharchuk

Co-Founder & CEO

I have seen how typical development agencies operate: too many clients, not enough time, prioritizing their own gains over the client’s results. It is my mission to ensure that we, at Interexy, always stick to our values. We have an obsession with our clients’ success and the laser focuses on a select few businesses. Staying at the forefront of mobile development to help our clients beat the competition is our goal.

Evgeny Mahnach

Co-Founder & CTO

I am a scientist turned Software Engineer turned Senior IT Consultant. I am the bridge between your business objectives and development strategies. I am strategic and pragmatic to the bone, so I will never waste your time or money. I believe meritocracy shall reign so you will always get my honest perspective. My intention is to be the last developer you will ever need to partner with.

Ilia Stakhno

Chief Project Manager

I’m obsessed with processes. Life is a huge process to go from point A to B to C and so on. My job is to make sure we are following the best practices when developing the software solution for your business. Jira, Scrum, Agile, daily standups, grooming & presentation sessions are my best friends. If you do not have a clear development process on your project – we are coming to you!

Elizabeth Ermakova

UI/UX Designer

Bad UI/UX shall not pass! Following modern guidelines, tying up the UI solutions to your target users’ base, carefully applying best user experience practices is my day-to-day duty. Perfect UI/UX is one of the most important things that can differentiate your app from the tight competition in the marketplace. Ask me how to design RIGHT!

Learn More

See if you qualify

We only work with companies if we believe we can bring them awesome results. To see if your business qualifies for our services, click the button below, fill in the short questionnaire and choose a suitable time for a Free Consultation Call with one of our mobile consultants.

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