Custom web applications

UpsilonIT is a web app development company with over 7 years of experience. We build world-class B2B and B2C solutions: from web portals to Progressive Web Apps (PWAs) and complex customized web apps. We create apps that reach the goals of our customers and steal the hearts of end-users.

Our experts leverage superior market know-how and the best-in-class technologies for web application design and development. Our solutions will enhance visibility and boost the conversion of your digital business and thus help you beat competitors.

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Features of our custom web applications

We make multi-integrated, easily customizable and fully controllable web applications.


Our web application solutions will take your business to the next level. Leverage our hands-on experience in delivering dynamic, complex, and challenging web applications that perform

Integration capabilities

All web applications we deliver have in-built integration capabilities. We create future-ready connections to third-party services, including payment gateways and business automation services


We implement top-grade security features in the process of web application development, including role-based permission, transaction, and data sharing protection systems


UpsilonIT helps to embrace the benefits of cloud computing - high speed of work, scalability, reliability, easy maintenance, 24/7 availability, cost-efficiency, etc.

Custom web applications we build

Web Portals

Our long-term experience in web portals development helps us to deliver the best result for our clients. We apply up-to-the-minute technologies to develop company- and customer-focused, partner/vendor, learning, healthcare and other types of web portals. Our well-trained developers know how to implement all necessary functionality and represent it in a user-friendly format. UpsilonIT can also develop and test websites that can handle a huge number of user traffic and requests without system failures. Web portals with a high-load scalable architecture function smoothly and reliably allowing you to provide an engaging UX and increase ROI.

Progressive web applications

Progressive Web Applications (PWAs) is a relatively new technology that is taking the world by storm. Introduced and promoted by Google, PWA recognized by Gartner as the one to substitute more than 50% of mobile native apps. The technology behind PWA development makes it possible to combine the best features of browsers and mobile apps, i.e. PWAs offer an alternative way to target and engage users and increase conversions.

Why PWAs instead of a web apps?

  • It acts as a web page but lets you engage with customers through push notifications
  • It works across platforms and delivers a native-like user experience
  • It loads when users have a weak or unstable Internet connection thanks to the Service Workers’ technology
  • It syncs in the background and updates automatically without user interaction

Single-page applications

Tap into our single-page application development services to remain competitive on the web and uncover a host of benefits for your business. We utilize the latest technology to deliver fast, efficient and flexible applications with cross-browser compatibility. UpsiloIT combines the best features of single-page applications (SPAs) to provide excellent app performance and provide a seamless experience for your end-users.

Technologies we utilize

Our top priority is to build high-quality web applications that meet and surpass customer expectations.

For the front-end part, we prefer to use JS and its frameworks and libraries. We build interfaces of any complexity with the help of React. If you need server-rendered apps, we will recommend using Next.js and Gatsby.

From a variety of programming languages that power back-end development, we turn to Python with Django, Flask, and Falcon frameworks.

We empower our web app solutions with elaborate UX/UI that help create a truly great user experience.

Our development process

Clarify and set project requirements
Create a system design and UX/UI wireframes
Define and prioritize development tasks, create a backlog, prioritize all the tasks and provide estimates
Select the tasks from the top of the backlog for a 2-week sprint cycle
Deliver sprint results and iterate based on the feedback
Finally, deploy the project after all goals were met

Our projects


Web Development for a Telemedicine Service in Ophthalmology

Web Development for a Telemedicine Service in Ophthalmology

Charity Donation Platform Development

Charity Donation Platform Development

Web Development Services for a Music Tech Company

Web Development Services for a Music Tech Company
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Get in touch
Communication is the key. Let's discuss your project together.
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Kenny R. Lienhard

CTO, Medignition Inc

We wanted to implement a new education platform that offered online courses in finance. The scope focused on the implementation of multiple user interfaces. UpsilonIT used React, GraphQL, and GatsbyJS. UpsilonIT had strong coding skills. The app had a clean codebase and complied with all specifications. They complied with our requirements for the UI. We communicated daily via Slack.

Matt Wong

CTO, Civic Connect

Upsilon’s work was always on time and met all customer expectations. Their team had an ease of communication but what was the most impressive about them is the integrity and work ethic of each member. We had a business manager, a lead architect, and a mix of senior and regular engineers. The workflow was extremely effective - the teams had a regular cadence for communication.

Zhanar Serikpayeva

Creative Consultant, Etage Group

We needed help with mobile app development, data analytics, and beacon installation to be able to collect, store, and analyze our customer data. The finished application met the requirements perfectly, with the team finding an excellent solution to collect, analyze, and store customer data. They were highly professional throughout the work, always making themselves available, and responding well to any changes.

Dmitry Tsybin

Director of Engineering, Carggo

Upsilon provided front- and backend development for an online logistics platform. The team designed and launched a business intelligence platform and ensured scalability according to customer requirements. We were most impressed by the technical background of the specialists, their meaningful approach to task accomplishment, and aspiration to deliver the results in due time. We’re also pleased with how fast the team started the development.

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