Our Services

We have a wide range portfolio based on years of experience designing and implementing software solutions for our clients. Over the years, we have specialized in the areas of communications, backend systems and infrastructure development.

Custom Software Development

Custom software development is the process of creating a specialized IT solution that can accommodate customer's particular preferences and expectations. Our software engineering process collects and translates business requirements into imaginative technology solutions that become reality with custom software development.

In an ever-changing world, staying ahead of the competition is now harder than ever before. Optimisation of business processes and performance is a continuous necessity if we are to improve customer engagement, realise increased efficiency and ultimately generate increased turnover and profit. To achieve this, organisations must implement software solutions that are specifically designed and developed to their unique business processes. We offer leading-edge technical knowledge and proven experience, taking a consultative approach to understanding your needs in order to support you in choosing the most suitable development approach.

Backend and Infrastructure Development

Backend development is centered in building the infrastructure that supports a user facing application, using a diverse range of languages and systems. The backend system may include functionality for the information processing and analysis, databases, content management systems, as well as many other necessities, critical for the application’s health, including external systems communication.

Our backend development team creates customized systems for what matters to your business, and opens up areas of potential growth. We make technology work together behind the scenes so you can focus on the more important business processes.

Our backend systems developers can get your business moving by:

  • Tapping into our specialized focus in systems engineering, development and integration
  • Building custom Content Management Systems (CMS)
  • Developing new digital enterprises and enterprise systems for greater mobility and growth
  • Applying RESTful APIs to create secure interactions among integrated services
  • Creating secure and efficient cloud platforms, cloud frameworks, and system frameworks
  • Creating your digital solution’s SDK (software development kit), lending extendibility to products and services through third parties

Big Data Services

Big Data is a term of data sets that are so large or complex that traditional data processing applications are inadequate. Nowadays, more and more companies and organizations are beginning to use the potential of this technology in order to make faster and smarter decisions in modern and dynamically changing market. With our experience in building Big Data infrastructure, we help our customers take advantage of the vast amount of information which surrounds us.

Let us help your organization to take advantage of the bleeding edge big data technologies used by Google, Facebook, Amazon, Yahoo, eBay, and other data giants.

We have expertise in the following areas:

  • Big Data architecture and system design
  • Installation and Configuration of Cloudera, Hortonworks, and other Hadoop distributions
  • Data processing using Hive, Sqoop, Pig, Kafka and Spark
  • Data analytics and development using R, Java, Python, and Scala
  • Data processing with tools like Knime and Pentaho
  • Integration with cloud providers like Amazon Web Services (AWS) and Microsoft Azure environments
  • Visualization and analysis with Datameer, Tableau, and others

Cloud Service Development

The popularity of SaaS is becoming stronger every day, and today's Cloud solutions can bring competitive advantages (such as flexible fees, remote access, fast deployment, ongoing support etc.) and tremendous increase of efficiency and effectiveness to your business.

Taking advantage of cloud services you will receive the following benefits:

  • Reducing time for software update on users' computers
  • Infrastructure for users' computers becomes less expensive
  • Access to software and data from many offices
  • Flexible software maintenance and updates
  • Centralized backup
  • Rapid scalability to meet demand

Some of the cloud providers we work with:

  • Amazon Web Service
  • Google Cloud Platform
  • Microsoft Azure
  • Digital Ocean
  • Rackspace

Mobile App Development

Mobile apps are essential to every modern business. From employees to customers, mobile apps make it possible for people to stay constantly connected and productive. Every year the demand for mobile technologies grows on average by 15-20%, and today they are widely used not only by the end-users but also by large corporations for resolving their business critical challenges.

Our mobile development expertise ranges from creating native mobile applications for specific operating systems (including iOS, Android and Windows), to cross platform apps that work regardless of the chosen platform. We design and create mobile applications from the architecture, through functionality, to user interface.

Platforms we develop on:

  • Android
  • iOS
  • Win Phone 7,8,10
  • Windows Mobile
  • Smart TV

Web App Development

At CST, we offer unique and highly scalable web application development solutions matching customer’s business strategies and requirements. With latest technologies, reinforced frameworks and flexible methodologies, our experts create enterprise apps, facilitating business transformation. We work closely with customers for better understanding of their business goals and deliver high-quality business value combined with technology and process.

Technologies we use:

  • .NET
  • PHP
  • JAVA
  • HTML5
  • CSS3
  • Rails
  • Ajax
  • Django
  • Python

WebRTC Development

WebRTC (Web Real-Time Communication) is state of the art web technology which support browser-to-browser applications for voice calling, video chat and P2P data transfer without the need of either external plugins.

This technology advancement is meant to make communication on the web simple and convenient.

If your company planning to start a new WebRTC service or want to update your current product and need information for the technology, we provide professional WebRTC programming services and already implemented the technology in own solutions as well in our client’s products.

Want to learn more about WebRTC and it's many benefits? Check out our detailed WebRTC page.

VoIP Development

The VoIP uses the Internet Protocol (IP) to support the communication with highest possible quality. The VoIP technology enables the transfer of voice and video over the public internet. VoIP telephony has established itself as a flexible, cost effective communication technology.

We offer various VoIP development services to keep your organization's infrastructure ready for tomorrow. It is well known that collaboration is a key to success in the current business scenario and a well connected communication system is what is required to accomplish the desired level of collaboration within and across the organizations.

Our experience covers all areas of VoIP solutions and we can provide expertise in developing:

  • VoIP platforms (PBX)
  • Conferencing
  • CDR processing
  • VoIP server failover, clustering and call encryption
  • Call Center
  • VoIP service architecture
  • Desktop VoIP applications
  • Enterprise grade VoIP solutions
  • Custom VoIP feature development
  • WebRTC integration
  • SIP trunking/PSTN termination
  • VoIP service provider integration: Twilio, Tropo and others
  • SIP Load balancer
  • SIP and RTP proxies


Based on our extensive experience and accumulated know-how, we can provide professional and expert consulting to our customers. Our consultants carry out customer project planning and design, and cost estimation.

Our major strength is the ability to provide high quality services to clients with very complex platforms and systems that require optimization to increase efficiency and adopt new technologies.

We approach each client’s project individually. We uncover and explore the requirements, design implementation roadmaps and implement a solution that best suits the client’s budget, schedule and technical constraints.


Bulgaria is a preferred nearshore and offshore IT outsourcing location and is currently listed as one of the top 5 outsourcing destinations in the world. We provide a very good combination of high quality experts, excellent language skills and low costs. Our company implement the newest business practices, so we keep up with the high standards and industry requirements.

Here are some of the key advantages of outsourcing:

  • Reduction in operation costs - One of the main arguments for outsourcing a business is the opportunity for the outsourcing company to lower its operation costs. The transfer of a business function to a third party in a foreign country is related to significant reduction of costs due to the fact that same activities are paid several times less in countries where business is outsourced.
  • Focus on the core of the business - Outsourcing gives companies the opportunity to focus on their core competences, thus being more efficient in their business operations.
  • Quality improvement - Outsourcing is a process of delegating operations or jobs to an external entity that specializes in that operation, and thus offers a high quality of implementation.
  • Better location in terms of new markets - Outsourcing gives the opportunity to approach new clients faster and more efficiently. Very often it saves time for distribution and increases the competitive advantages.
  • Trained, experienced and qualified staff - Working with a quality IT outsourcing provider means you instantly gain access to highly trained and experienced staff with specialized knowledge about the latest technology and trends.

Looking for professional IT services? We can help. Just contact us at contact@cst-bg.net.