Your partner in web development!

We take care of the development of your web application following the latest UI/UX and programming trends. Contact us and let's talk about the development possibilities of your product.
web development services


projects in betting industry


of senior developers


employees onboard


active users of our apps


Development languages


Clutch rating

Web app development

Web app development

We are a web app development company which specializes in building highly performant web applications. We would love to create an MVP for your web app.

Deep knowledge about micro-services and SaaS solutions helps us in the creation of highly scalable web applications. To ensure the highest quality of our services, we designate a dedicated team of Quality Control engineers who are responsible for both full quality control of the web app under development and creation of automatic tests if appropriate.

Based on clickable mockups our front end team can create Responsible or even Progressive Web Applications. Our DevOps engineers build and maintain highly available and reliable infrastructure of your digital product.

We take responsibility for the entire web development process, from consulting your product vision, through UX/UI design, to development and maintenance. By choosing to work with CrustLab, you get a free project estimation and a two-week test period if you need to verify our skills and style of work. After completing the development phase, you gain full ownership of the product.

Full stack web development process

Ideation - CrustLab

The cognitive process, thanks to which we verify your product idea and advise on the best solutions.

Design - CrustLab

Our designers create low fidelity mockups and after your approval - final vision of your product.

Production - CrustLab

Source code of your product is created based on previously designed mockups.

Improvements - CrustLab

Even finished product needs improvements based on user behaviour and opinions.

Web development case studies - read more about our web apps

Sportech online betting platform

Next generation of multi-tenant Horse Racing betting system hosted by one of the biggest players in the betting industry.

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on production during the Triple Crown

16 → 24


Mean session time


as of 31/01/2020

241% increase in number weekly sessions per user

ICEO - Android widget application

Development of Android widget application which allows the user to follow the cryptocurrencies rates in realtime.

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of required network resources

85% → 99%

stable sessions




of widget optimization

Pretta - project management
pretta logo

Project management

Cost estimation

Pretta - project management iOS application

Readable and easy to use even for lay people iOS application designed to optimize project management processes.

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time needed to create the estimation



of estimation

Frontend development

Frontend development
MVP development

MVP development

Minimum Viable Product is an early version of the product, which has only the core features necessary to run it and collect user feedback, allowing to discover user needs and reduce the costs of further development.

Progressive Web App

Progressive Web App

PWA is a combination of web pages and native apps which providing website users full benefit of mobile experience whenever they want. PWA is a technology thanks to which your website will achieve high performance, like a mobile app experience, great usability, customer loyalty, and at the end of the day - better conversion and cost-effectiveness.

Responsive Web Design

Responsive Web Design

RWD is a necessary practice in web development nowadays which allows to display the page correctly regardless of screen sizes or the device used. RWD approach ensures usability and users satisfaction across all devices, through use fluid layouts, flexible images, proportion-based grids and CSS3 media queries. Responsive Web Design become especially important due to the fact that mobile accounts for half of the Internet traffic worldwide.

Mobile first design

Mobile first design

We live in the era of mobile, which forces businesses to be mobile-friendly. Therefore, the mobile-first design consists of the creation of websites with mobile in mind first and then the migration of solutions to the desktop. In mobile-first design, the content is one of the highest importance, together with simple design, high performance, easy contact, and visual attractiveness. It improves Google Ranking in a significant way due to the mobile-first indexing rule.

Backend development

Backend development
Cloud-based software development

Cloud-based software development

Would you like to move your business to the cloud? CrustLab provides expert consulting and comprehensive cloud development, making client’s market success possible. It’s a recommended solution for enterprise, scalable solutions.

Multi-tenant systems

Multi-tenant systems

We have an experience in developing multi-tenant solutions. We are ready to create an application that core will be the same for all of your clients but the UI part will be adjusted to your clients needs. There are a bunch of benefits using this solution starting from cost reduction, through ease of updates of your system (updates applied to the system affect all customers) and onboarding process (the environment is the same for all of your customers).

High-performance app

High-performance app

We pay particular attention to the system architecture, scalability and performance. Our systems are able to be used by thousand of users simultaneously.

Web development cooperation model

You choose the cooperation model yourself

Dedicated team - CrustLab

We can provide you with a dedicated team

Extension of your IT

Extension of your internal IT department

Custom web app development

Custom web app development

We will build your custom web app from the scratch. Tell us about your requirements and the difficulties you face, and we tailor solution to the individual needs of your business. Our custom apps permit to improve work through automation of internal company processes or support endeavour of your clients. By creating a custom web application you can simplify managing content, inventory, communication with customers, and human resources processes. If you are looking for authorial CMS system, custom CRM app, dedicated ERP system or other - fill in the contact form and let’s talk.

Web development for business

Web development for business

We are experienced and familiar with work on web development solutions for enterprise business, that can improve the overall efficiency, bring down costs, and boost business growth. We are at your disposal regardless of whether you need a dedicated solution created from scratch or you want to improve the performance of your current digital products - fill in the contact form and let’s talk.

How much web development cost?

How much web development cost?

Are you wondering how much your web development will cost? Fill in contact form and receive a free estimate. We value each project individually, and the valuation process itself is easy and transparent: - first we discover your needs and requirements - then we convert the list of requirements into user stories - after that we estimate time required to finish stories - based on time and required resources we are ready to send you our offer.

Technologies we use in web development

Wed development technology React

A library that helps us build innovative, simple and interactive user interfaces.

Wed development technology JVM

An excellent choice for building scalable, secure, enterprise solutions.

Wed development technology Node

A light, scalable platform which uses I/O model which makes it efficient. A great choice for both MVP and micro-services.

Wed development technology Python

Perfect for both fast prototyping and big data processing.

Adam Gontarz - CEO of CrustLab

Hi, I'm Adam - CEO of CrustLab

I would love to share my experience and talk about challenges you are facing! Feel free to reach out to me to discuss your ideas and needs for any project.

Why do you need to hire CrustLab as a custom web development partner?

Web development partner

Our company has three founders and one of them is always involved in your project,

because every web application is just as important to us.

We are flexible when it comes to team composition or cooperation model -

first of all we can help you to develop web app requirements and specification, you can have a dedicated web development team or app development team with product owner. We can also support your internal IT team - whatever you need to build and maintain your custom web application.

+10 projects implemented in the betting industry -

focus on horseracing, sports betting, online casinos and retail. We’ve created software for self service terminals, web and mobile apps. We have a lot of experience in this area but the scope of our portfolio is wider - we love working on the: e-commerce, trading platforms, investment software, medtech (healthcare), blockchain or custom CRM/CMS.

We will serve your project comprehensively -

starting from strategic and product workshops, through design, frontend and backend development to maintenance or even marketing activities.

What additional value do you gain through having CrustLab as a web development partner?

Free project estimate and deep understanding of your needs

before the web app project starts - this is your first saving you get thanks to cooperation with CrustLab.

Transparency and ease of communication

(100% office-based team) - when we work on your web application you have access to Issue Tracking Tool - JIRA, project documentation on Confluence, Slack channel dedicated to your project (but all binding provisions we determine by email). You can also contact directly with every member of the team, not only the Project Manager.

Proactive approach and project workshops -

we are not waiting for a ready-made action plan, we are here to help you in creation of product strategy and making the key decisions.

Excellent technical skills and work done on time -

are something that our clients always emphasize in the testimonials.


sensitive information and shared data regarding the project or your company are secure and protected by the law.

We follow the main principles of Agile and Lean Management -

we strive to ensure that the methodology of work allows us to achieve satisfying results.

Mobile development partner 2
bubbleQuotiation symbol

Trusted by leading brands

Sportech logo

CrustLab consistently adds value to our organization in many ways. We've received very positive feedback on the system CrustLab has delivered. Our customers regard it as an excellent product. Our experience working with them has far exceeded those of other vendors.

Scott Watterson

Director of Digital Development

Clutch logo
Nowe Motywacje logo

We take advantage of CrustLab's experience in the field of payments, new functionalities and user-friendly design. The development process itself ran smoothly and according to plan. It was important for us to complete the project on time, so I cannot imagine a better partner for this project.

Agata Kołodyńska

Director of Operations in Nowe Motywacje

Start working on your web development right away!


Contact us

Contact us

Fill out the contact form, briefly describe your project or ask us a question.


Discovery call

Discovery call

Adam - our CEO will arrange a video meeting with you in order to clarify the project assumptions.


Project estimation

Project estimation

On the basis of the collected information, we will prepare an estimate of the costs and duration of the project.

Frequently Asked Questions

In this section, we have collected questions that are repeated during conversations with customers, and we have explained some key terms that may raise doubts. We hope you find the information below helpful. If you have any questions, please write to us!

What is a web development service?

The web development service concerns software created for the Internet. It could even be a simple website. CrustLab as a web development company implements much more complex projects, i.e. web applications including frontend and backend development. As part of the web development service, we offer:

  • MVP development - Minimum Viable Product is the preparation of a basic version of your digital product.
  • PWA development - Progressive Web App is a combination of a website and a mobile application that achieves very good performance and works on various devices using the full potential of smartphones.
  • RWD development - Responsive Web Design is a flexible approach to designing websites and web applications, allowing for the correct display of the product also on mobile devices.
  • And many more, such as testing and maintenance.

What are the types of web development services?

On a general level, there are three types of web development services that differ in the technologies used:

  • frontend development
  • backend development
  • full-stack development

The scope of each of these services includes more detailed activities such as MVP development, Progressive Web App Development, Responsive Web Design, Mobile-First design, Cloud-based software development, multi-tenant systems, SaaS platforms development, test, maintenance, and more. Bigger services that require not only a common backend to be created but high optimization or even data mining could also be interpreted as a result of web development services provided but in general, the process of creation of such complicated applications should rather be called Custom Software Development.

What is a web application?

The web application runs in the browser and it’s optimized to be displayed on different devices, e.g. mobile phones without downloading. The Web app stores and displays information to users and allows them to interact with the content of the application thanks to such functionalities as customer account, adding forms and attachments, adding products to the shopping cart, making payments, and more. Web applications are much more complex than simple websites. They contain more information, so they operate on the basis of data transfer from an external server. Such web applications are stateless with some minor exceptions - backend services are responsible for the maintenance of data and the state of user details or even content that is displayed in the web application. The creation of a visual part of the web application requires knowledge of JavaScript, CSS, or HTML5.

What are the types of web applications?

There are several types of web applications that differ in functionality, way of operation and often appearance. Static web applications are built in a simple way, and modifications each time require interference in the source code. The structure of dynamic web applications is more complicated because they use data libraries to display information to users. This allows for easy content modification. Another type of web application are online stores and portals as well as content management systems. Nowadays, most of the IT products are web-based applications. Thanks to this software components do not have to be downloaded but are fully hosted by external services hosted locally or cloud services.

I'm not sure if I need a web app. How to make this decision?

First, answer the following questions. Is there already a web application similar to the one I want to create on the market? Does my competition have web apps? Can I afford it? How will the investment in a web app for my business pay off? If you are not sure whether a web application is a solution that your business needs, rely on the opinions of experts. Before starting work, we always discuss the client's business goals, current problems and possible solutions. After such analysis, we will be able to confirm whether you need a web application.

My web application was created by a company with which I ended my cooperation. Am I able to develop this project or do I have to start a new one?

To continue working on a web application that was created by another company, you need access to the source code created by your previous partner. The project could then be developed by another company. There are however a few very important points you have to have in mind. Some of them are: technological fit - a new company needs to be able to easily and quickly understand the web application. Some time will be needed for the new company to get to know the project. technical documentation - every time you order some software development service, make sure that you also allocate a part of the budget on the documentation. This might sound like a waste of funds at the very beginning but it pays off later on, especially when you’d like to hand over your project to another company technical debt - it is possible that your partner never updated technologies used in the project or the quality of source code is very low. In such cases, it might be extremely difficult to reduce that technical debt and as a result, it would be more profitable to rewrite the project than wasting time on creating hackly solutions that just work but the software is not extendable.

Keep in mind that predictable software development processes and quality of the source code are very important and you should always pay strong attention to that while choosing your partner in software development.

What type of web app should I choose?

It all depends on your business goals and assumptions of the web application. If you only need an online business card so that customers can find your data on the web, a simple static web application could be enough. If you’d like to modify the content of your company website a CMS system could be required. Headless CMS system would let you modify textual values displayed on your website but there is also an option to implement a full CMS technology that would allow you to modify all the content of your web application. If you need more functionalities that will allow users to perform certain actions, you need a dynamic web application. In other situations, the response to your needs will be a dedicated online store or a custom web application’s administration panel. If you still hesitate, the software house will help you make a decision before starting cooperation.

Is the web application efficient enough?

The performance of a web application depends on the quality of its source code and the technology it was created with. Work on improvements should be permanently included in the business strategy of each project. Extended web application loading time directly affects the exit rate. A well-optimized web application means more conversions with more value. As you can see, web applications can be efficient enough, but it all depends on what specific web application we are talking about. The most important thing here is the knowledge and quality of workmanship, not the type of web application.

When is it worth creating a web application?

Nowadays, this is one of the best business paths, having desktop applications is an alternative. It's a great way to reach a wide audience. Despite the constantly growing share of mobile traffic, desktop traffic still constitutes the majority in Google reports. The Web App is a better solution for products that need constant content updates and new functionalities. A progressive web application will be perfect if your clients need to use it quickly or without Internet access from mobile devices. Especially progressive web apps are perfect for the e-commerce industry.

What is web frontend development?

The web frontend is a presentation layer of the web application. Web frontend development is a service of the creation of graphically represented data elements of simply an implementation of a purely visual part of your web application. The whole process of web frontend development gives users the opportunity to interact with the web application. Frontend development is responsible for the external part of the web application used by users. A person working on frontend development should know JavaScript, CSS, and HTML very well, but also React, Redux, API integration mechanisms, REST - JSON, or GraphQL.

What is web backend development?

The so-called backend is a service of a set of services containing most of the web application logic and providing points of communication that could be used by external services or your web application’s UI - frontend. Web backend development is a service of the creation of a service that in the background carries out all the processes responsible for the correct operation of the web application and the server on which it is located. Simply put, backend development is responsible for making the web application or website work properly. Backend development is responsible for the internal part of the web application, which is not accessible to users. A person working on backend development should know technologies such as Python, Scala, Ruby Java, or other programming languages, depending on the project. Such a person needs to know a few types of databases such as MySQL, PostgreSQL, Firebird, MongoDB, Cassandra, SQLite, or Oracle. In addition to that, the person needs to know basics of API design, microservices architecture and a variety of communication protocols. The role is one of the most demanding as the backend is the root of your mobile or web application and the number of required technologies grows quickly over time.

What is PWA?

Progressive Web Application is a mix of website and mobile apps which is installed on the server, but users can use it via a web browser or install it just like a native mobile application on mobile devices. PWA provides the full benefit of native apps such as high performance and great usability. Unfortunately, progressive web applications do not use all smartphone features like geolocation or sensors, but they are perfect for selected industries, e.g. e-commerce. Users using PWA can save the web application in the memory of their phone and use it in the same way as with a native application, even without internet access.

What is RWD?

Responsive Web Design is not a trend anymore but a necessary practice in web development nowadays. Thanks to RWD the website is displayed correctly regardless of the device being used or screen size. RWD ensures user’s satisfaction and usability for all devices. It is a very flexible solution that emphasizes UX/UI design and adjusts the displayed interface to the screen size on which it is used. Due to the growing popularity of mobile phones in our daily lives, Responsive Web Design became especially important.

What is a mobile-first design approach?

In the era of mobile, it is important for businesses to be mobile-friendly. Mobile-first design consists of the creation of websites with mobile in mind first and then the migration of solutions to the desktop. The most important aspects of mobile-first design is a simple design, high performance, content, easy contact, and visual attractiveness. Mobile-first design is a solution that will not only appeal to your customers but will also positively influence your position in Google search results.

What technologies do you use for web development?

When implementing the web development service, we use different technologies depending on whether the work relates to frontend or backend development. In the first case, we focus mainly on JavaScript, PWA, and React.js. In the second, we use technologies such as Kotlin, Java, Scala, Node.js, Spring, or Kafka. Of course, there are many more. Everything depends on the software project we are being asked to implement.

What skills should a web developer have?

The skills most needed in the work of a web developer are primarily the knowledge of technologies such as JavaScript, HTML, PWA, React.js (frontend development) and Kotlin, Java, Scala, Node.js, Spring, Kafka (backend development). In addition, a web developer should have analytical skills, the ability to conduct tests, knowledge of web design trends and the basics of Search Engine Optimization. A web developer is a position that requires cooperation with the marketing department and graphic designers, therefore interpersonal skills and knowledge of English will be important.

What does the web development process look like?

The web development process is an instruction to follow the steps necessary to complete a web development project. The web development process at CrustLab consists of the following parts:

  • Planning which defines the entire product: technology, team structure, tools and specific tasks
  • Design which creates the visual layer of the product, from ideas written on paper through low-fidelity mockups to high-fidelity mockups which are the reflection of the project’s final version.
  • Development which transforms the assumptions planned and illustrated at the previous stages to the source code and a real product thanks to the work of programmers.
  • Launch, i.e. putting the web application into use

Both during web development and after the launch of the product, we perform manual and automatic tests and collect feedback from early users in order to fix errors and provide the highest quality web application.

How to use web development in business?

Web development supports various types of businesses in reaching online customers. Ranging from simple business card sites, through more complex web applications, enabling the growth of businesses in industries such as betting, e-commerce, fintech, healthcare, e-learning, transportation, entertainment and many more. If your customers are online, you can reach them thanks to the web application.

Do you provide web app maintenance?

Naturally. We have clients whose web applications we wrote a few years ago, and cooperation in maintenance and optimization continues until now. The situation in which the product is developed by programmers who know it well is beneficial for both the client and the web development company. Long term partnership in software development is one of our key targets.

Do you provide quality assurance?

Yes. Source code testing is an integral part of the web app development process. Application tests are performed before each subsequent deployment. If you have not used the CrustLab web development service, but want to order a source code audit for your web application, write to us.

ul. Nadwiślańska 1/10

30-527 Kraków, Poland

[email protected]

+48 795-856-491

See our location on map


VAT-UE: PL6793159393

NIP: 6793159393

REGON: 368770514

KRS: 0000703502

Copyright © 2018-2020 CrustLab Sp. z o.o. All rights reserved.