Custom Web App Development Services

Upsilon is a web development company that covers the complex of the most diverse web solutions: from one-page landings to enterprise-grade web applications.

Being accomplished in both back-end and front-end sides of the professional web development services, we ensure your software's high performance, scalability, portability, and security.

Web Development Illustration
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Web Development Services We Offer

Back-end code

Back-end development services

Leverage Upsilon’s web app development services for building back-ends that perform fast, provide secure and reliable data storage, and scale on demand to meet your business needs.

Drawing on our experience in Python, Django, and other programming languages and development frameworks, we will help you design the core of your web-based application — with an eye for availability, robustness, and great new features.

Whether your project needs a custom API, be it GraphQL or REST - our architects and senior engineers will get you covered.

Front-end development services

Our front-end developers deliver visually rich and highly interactive custom web development solutions that attract, engage, and convert.

We can help you balance the stunning UI equal to the market-leading software products with the business logic of your web, mobile, and SaaS applications.

With React JS in the core of our custom web development services, we deliver high-performing apps without compromising your users' experiences.

Front-end result example

Discover our custom software development services

We are ready for challenges of any scale and complexity. Take a closer look at our service portfolio to find out how Upsilon can help you unlock the power of new tech and speed up your digital transformation.

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Types of Custom Web Applications We Build

Leverage our web development services to develop cutting-edge B2B and B2C web solutions with outstanding UX/UI design, robust architecture, increased scalability, and advanced functionality.

Internal Web Applications

As a company providing custom web app development services, we deliver software that helps businesses streamline internal processes and operations: project, resource, and financial management, workflow automation, communication within and between teams, and more.

SaaS Applications

Take advantage of the SaaS flexibility and scalability powered by Upsilon’s web application development services and boost your business’ bottom line with a robust subscription-based platform.

Whether you need to develop specific SaaS components like APIs or implement integrations like Stripe, our SaaS developers are at your service.

Two-sided Marketplace Systems

If you need to develop a feature-rich two-sided marketplace system - we will get you covered. By leveraging our expertise in this domain, businesses can receive tangible benefits from the network effects created through the commercial interaction between sellers and buyers.

AI/ML Web Applications

Drawing on our experience in NLP/NLU, we deliver AI-based and machine learning web solutions, including intelligent chat apps for logistics and supply chain management, banking and finance, e-learning, healthcare, and other business domains.

Decentralized Applications (DApps)

By offering a full spectrum of custom web application development services, we help businesses unfold the potential of blockchain technology.

Our blockchain developers are proficient in leveraging the Ethereum and web3.js technology capabilities to build a solution that will help your company stay on the competitive edge in the decentralized applications world.

Location-based Web Applications

From applying GPS and iBeacon technologies and mapping service integrations to developing complex route-planning, geofencing, or navigation apps, we help our clients implement location-based technologies into their web products, services, and business processes.

Looking for a company to fulfill your needs in web app development services?

Upsilon has more than 50 software engineers, QA experts, designers, data scientists, and DevOps who are ready to lend a helping head in the web development process, empowering your business. 

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Technologies We Use for Web Development

As a leading web development company, Upsilon utilizes the most cutting-edge front-end and back-end technologies.

We meticulously analyze all aspects of each business and offer the best-suited combination of front-end and back-end technologies to fulfill your project requirements.

Back-end

PythonDjangoFastAPINodejs

Front-end

ReactNextJSGatsby

Deployment

EC2S3CloudfrontRDSLambdaECS/ECRGCP

Advantages of Our Top-notch Web Development Services

Have web development initiatives on your company roadmap? Count on Upsilon’s custom web development services to strengthen your competitive edge by implementing and propelling to market the most advanced web-based software.

Upsilon knows how critical it is to fulfill clients’ requirements. Whether you need a turnkey, optimized, and visually stunning web app or need a fault-tolerant server solution and fast API to empower an existing solution, we will bring our professional web development services to the table.

Rich features

Keeping in sync with each project’s specific, we are ready to deliver an unparalleled solution craftly tailored to your business needs and equipped with features of any complexity: from push notifications and social media integration to in-app payments, custom big data analytics, and AI-based functionality.

Superior User Experience

Whether it’s a web app or website development, UX and UI are central pillars the user experience rests on. For Upsilon, delivering a top-class design means increasing user satisfaction and advancing their usability, accessibility, and efficiency with the website or app.

Flawless Integrations

Using a wide variety of integration tools and APIs, we enrich the functionality of web applications while accelerating time-to-market and reducing costs. With our web development services you will seamlessly connect your application with leading third-party software, be it ERP, CRM, payment, or analytical systems.

100% Security

We ensure your web solution protection at all levels: from user access and payment to digital signatures and data encryption. Our custom web app development services include code analysis and thorough testing that guarantees that your product will comply with all the industry's security standards.

Build a custom web application with Upsilon

Within its portfolio of custom web development services, Upsilon offers:

  • Business analysis for a well-rounded and in-depth understanding of the goals, scope, and limitations
  • Intuitive and responsive design to improve customer retention and loyalty
  • Stable, lightning-like, and error-free performance of your web solution
  • Regular updates to keep your product up to date and keep it competitive
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Agile Web Development Process

We follow a low-risk web development process underpinned by continuous delivery and seamless integration into the client’s release cycle from the discovery phase through design, development, QA, and maintenance.

Discovery & Planning

This stage aims to analyze your project vision, identify potential risks and benefits, and define business goals. Our specialists study and refine, if needed, project requirements to elaborate the best-suited tech stack, outline the project milestones, and opt for a most effective engagement model.

Design

From sketching & wireframing to pixel-perfect user interface design - we provide a full range of services that will make your web solution stand out in the market. By collaborating with our clients in Figma, we provide real-time involvement in the design process.

Development

We apply cutting-edge web development technologies and practices to create flexible, full-featured, and robust web software solutions for your business. 

Testing

We take care of product quality and ensure 100% stability and error-free performance of your web solution. We offer a wide range of testing services, including UX/UI tests and automated tests for complex projects.

Deployment

In this step, we transfer the project to the client’s hosting, connect the domain and test it on the production server. By combining the benefits of Docker containers and Kubernetes, we adhere to a well-established process of application deployment, scaling, and management.

Maintenance

Through continuous monitoring and troubleshooting, performance audit, and user feedback analysis, we accelerate new features implementation while speeding up the release cycle.

Release

Iterative development creates the conditions for quicker improvements and faster releases, contributing to early value delivery while ensuring stable and error-free functioning of the web solution.

Why Choose Our Custom Web Application Development Services

  • 35+ highly-qualified developers, flexible and adaptable in terms of innovation and cooperation
  • QA engineers, ensuring superior software quality during the whole project lifecycle
  • PMs with more than 3-5 years of commercial experience, guaranteeing on-time & on-budget delivery
  • UX/UI designers to ensure the best user experience with the combination of design trends and brand recognition
  • Agile web development services and processes to provide ongoing support and maintenance
  • More than 20 custom software solutions delivered through the deep focus on technology
  • 10 years on the market knowing how to get the most out of digital innovations and multi-year experience

Frequently Asked Questions

What are the web development services?

Web development services encompass a set of tasks associated with creating web-based solutions working via intranet or the internet.

More broadly, web development implies a certain sequence of activities and operations required to design, build, deploy, maintain and update a website or a web app to ensure user-friendliness, stability, and error-free performance.

What does a web development company do?

To build a web app or a website from scratch, a web development company typically complete the following scope of work:

  • Ideation and product concept development;
  • Choosing the best-suited technologies to deliver a web app according to the requirements;
  • Building a solution architecture;
  • Back-end web development: coding and programming;
  • Integration with 3rd party software: media, payments, video, etc.;
  • Publication of content and its optimization;
  • Front-end web development: UX and UI design;
  • Testing the app before it goes live (beta testing);
  • Identification of problems and bug fixing;
  • Implementing improvements and deployment;
  • Product maintenance and regular updating.

How much does it cost to build a custom web application?

The cost of web development services can vary greatly and mostly depends on two main factors: the complexity of web functionality and the hourly rate of developers (you may choose between having an in-house team or hiring an outsource tech partner).

A professional web app with medium functionality (landing pages, admin panel, user management, third-party integrations, database integration, etc.) can be developed within the range of $15,000-50,000.

The price for complex enterprise-grade web systems that need to maintain big data, handle thousands of users simultaneously and provide 360° security can go up to $100,000 and higher. Each complex solution is custom-made to meet the client’s requirements.

What are the best technologies used in web application development services?

Programming languages and frameworks used for web application development services can be divided into back-end technologies and front-end ones.

Python, Java, PHP, and C# are the most popular back-end languages. Among the front-end technologies, the leading positions are occupied by JavaScript, React, Angular, Vue.js.

While considering what programming language to choose for web development, consider the size and complexity of the application, extensibility, time, money, and team available. All projects are unique and require different tech stacks.