Belitsoft > API Modernization Services

API Modernization Services

If your software fails to align with your business processes or lacks integration options, Belitsoft offers app modernization that is as easy as updating APIs to ensure the required level of security, functionality, and scalability.

What is API Modernization?

API modernization updates legacy APIs (Application Programming Interfaces) to meet the latest security standards like OAuth 2.0 and JWT/JWS.

The service enhances API efficiency, security, and scalability for easier use with RESTful architecture.

API modernization seeks to improve integration, user experiences, and enable new digital service development and applications.

Clear API strategy, right technology environments, and expert engineers and product owners are Belitsoft's best practices for API modernization, establishing a seamless transition to modern solutions. Let's transform the outdated and pave the way for efficient application modernization.

If your legacy application lags, you need to upgrade it. The challenge is that as a business owner, especially without tech expertise, you don't know how to modernize legacy applications. Who's creating a modernization plan? Who's executing this plan? How do you find staff with the necessary experience or choose the right external partner? How much does legacy software modernization cost? Conducting business and technical audits helps you find your modernization path.

Dmitry Baraishuk Belitsoft's CTO on


Benefits of API Modernization

On average, 31% of an organization’s technology is made up of legacy systems. Maintaining those systems can be a costly burden, with an average of 60–80% of IT budgets allocated to keeping them running

Fast and Cheap Legacy Systems Modernization

API integration enables modern, flexible architectures for businesses.

Handling Large Data Volumes

API integration aids in handling larger volumes of data efficiently and reliably for businesses.

Real-Time Data Processing

API integration supports real-time data processing and event-driven interactions, meeting modern business demands and improving responsiveness.


API integration enables scalability, adapting to demand or fluctuating traffic patterns, ensuring reliable performance under heavy load.

Improved System Interoperability

API integration improves interoperability, simplifying the connection and coordination of various systems, apps, and services.

Better Performance

API integration can significantly improve system performance, reducing latency, and ensuring smooth and efficient operations.

Enhanced User Experience

Faster response times and intuitive interfaces through API integration can increase customer satisfaction and loyalty.


Updated APIs create adaptable systems for future tech and requirements.

API Modernization Pipeline by Belitsoft

API Assessment and Strategy Planning. Our specialists analyze your API-based architecture and identify gaps and areas for improvement. We offer support for API management best practices and modernization roadmap development. Our modernization recommendations vary based on app size and complexity: refactor, rearchitect, or replace with modern alternatives. This step requires the right API team to be assembled.

API Design and Development. Belitsoft assists in new API development and upgraded systems for improved performance, flexibility, and compatibility. For that, we migrate from a traditional SOAP-based API to a RESTful API or build GraphQL APIs.

API Integration. Developers ensure APIs connect and work with other software systems. This involves creating custom connectors or optimizing APIs for effective handling of diverse data sources.

API Security Enhancement. Belitsoft makes sure APIs are secure and compliant. This may require implementing security protocols like Auth and JWT and managing keys, tokens, and certificates.

API Testing and Monitoring. To ensure proper API functionality, API testing services can perform functional, load, and security testing. Setting up API monitoring can track performance and prevent major issues early.

The architecture of a solution to manage both internal and external APIs through Azure API Management

Azure API Management for API Modernization

We can use Azure API Management to modernize your APIs instead of rewriting them from scratch, which is preferable in certain situations. We can add new features without disrupting existing functionalities or users and without the time and expense of a full overhaul. This also allows us to test experimental functionalities on a subset of users without affecting the entire user base. Security enhancements, such as OAuth protocols, can be integrated more easily without altering the core API code. Effective version management is achieved by routing requests to the appropriate API version. Efficient API gateway, the developer portal, response caching and automatic scaling for high-performing and scalable APIs are well-known advantages of using this service. Azure API Management is a logical choice for companies who are in the process of Azure cloud migration, as it works well with other Azure services like Azure Functions, Logic Apps, and Event Grid to build robust, cloud-native applications.

Apigee API Management for API Modernization

Our Apigee services:
  • Utilizing Apigee tools for API design, development, and testing
  • Managing API traffic, caching, and payload transformation through Apigee's API gateway
  • Customizing the developer portal for improved understanding, exploration, and API accessibility
  • Leveraging API analytics for real-time insights into API traffic, response times, and error rates
  • Providing monetization assistance to maximize returns on your API investments
  • Implementing Apigee Microgateway for effective microservices architecture management

Amazon API Gateway for API Modernization

Our development team provides:
  • API development and deployment for seamless application integration
  • Traffic Management with throttling rules and caching capabilities for optimal performance and responsiveness
  • Security Implementation measures using AWS Identity and Access Management (IAM), Amazon Cognito, and Lambda authorizers to safeguard data against threats
  • Integration with AWS CloudWatch and X-Ray for comprehensive monitoring of API execution, facilitating issue identification and performance enhancement
  • Real-time API analytics reports for data-driven decision

Stay Calm with No Surprise Expenses

  • You get a detailed project plan with costs associated with each feature developed
  • Before bidding on a project, we conduct a review to filter out non-essential inquiries that can lead to overestimation
  • Weekly reports help you maintain control over the budget

Don’t Stress About Work Not Being Done

  • We sign the Statement of Work to specify the budget, deliverables and the schedule
  • You see who’s responsible for what tasks in your favorite task management system
  • We hold weekly status meetings to provide demos of what’s been achieved to hit the milestones
  • Low personnel turnover rate at Belitsoft is below 12% per annum. The risk of losing key people on your projects is low, and thus we keep knowledge in your projects and save your money

Be Confident Your Secrets are Secure

  • We guarantee your property protection policy using Master Service Agreement, Non-Disclosure Agreement, and Employee Confidentiality Contract signed prior to the start of work
  • Your legal team is welcome to make any necessary modifications to the documents to ensure they align with your requirements
  • We also implement multi-factor authentication and data encryption to add an extra layer of protection to your sensitive information while working with your software

No Need to Explain Twice

  • With minimal input from you and without overwhelming you with technical buzzwords, your needs are converted into a project requirements document any engineer can easily understand. This allows you to assign less technical staff to a project on your end, if necessary
  • Our communication goes through your preferred video/audio meeting tools like Microsoft Teams and more

Mentally Synced With Your Team

  • Commitment to business English proficiency enables the staff of our offshore software development company to collaborate as effectively as native English speakers, saving you time
  • We create a hybrid composition with engineers working in tandem with your team members
  • Work with individuals who comprehend US and EU business climate and business requirements
G2 Gartner good-firms Microsoft Forbes

Technologies and tools we use

API Development
Rest API
Bluetooth Low Energy API
Apple Pay
Google Pay
Apple Maps
Fingerprint API
API testing tools
Charles proxy
Ready API
Katalon Platform

Frequently Asked Questions

API modernization involves transforming traditional APIs and services into contemporary REST APIs compliant with the OpenAPI Specification. It incorporates up-to-date security standards like OAuth 2.0, JWT/JWS, and more.

API modernization for legacy software entails exposing its functionality through an API, enabling interaction with other applications. This integration streamlines enhancing legacy systems without requiring a complete overhaul.

A strong API strategy is necessary for overall business success, since APIs can be profitable. It creates digital platform business models with amplified transaction value through network effects.

Organizations can improve business compatibility by repackaging legacy services. They can achieve this by:

  • encapsulating services with RESTful APIs, providing access to underlying web service operations
  • constructing microservices by restructuring the foundational application code and exposing functions through APIs
  1. API-first facade approach. Belitsoft uses an API Management Layer as a facade for your existing legacy APIs and services while working on modernizing your legacy API-based architecture and infrastructure. Your software gets OpenAPI 2.0 / 3.0 compliant REST APIs using the latest security standards such as OAuth 2.0 / JWT.
  2. Hybrid approach. Our development team utilizes containerization and Service Mesh to manage microservices, which can be hosted in the current On-Prem environment along with the API Management layer.

According to the State of APIs Report, developers significantly increased their API utilization in 2022 and intend to continue this trend in 2023. APIs are recognized as a pivotal driver for achieving business agility, growth, and adaptability.


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