API Modernization Services

Transform your legacy systems into modern, high-performing APIs that open up new business opportunities and streamline operations.

Intellias: Powering digital transformation through API modernization

Modern APIs enable seamless, interconnected processes. APIs are the driving force behind the slick digital experiences that customers love. They also allow your company to create coherent, efficient processes and automated workflows.

Yet APIs built on outdated technologies and architectures struggle to meet the needs of modern businesses. Instead of being catalysts for innovation and growth, they hinder performance, limit scalability, and pose security risks.

This is where Intellias can help. Our API modernization services empower companies to transform their legacy systems into modern, high-performing APIs that help to scale and integrate new services.

Let’s talk

API modernization challenges we solve 

If you still rely on legacy APIs, you are limiting your business’s potential for growth and innovation. Our API modernization development services help you overcome these key challenges and pain points:

Outdated tech stack

Legacy APIs built on outdated technologies or architectures can be challenging to maintain and integrate with modern systems and third-party services, resulting in limited scalability and suboptimal performance. We can help you modernize these systems, laying a foundation for seamless compatibility and growth.

Performance bottlenecks

Slow, unreliable APIs lead to a clunky user experience, frustrated customers, and operational disruptions. With our API modernization services, you can overcome performance bottlenecks to deliver fast, responsive experiences and maintain business continuity across platforms.

Security vulnerabilities

Outdated APIs aren’t just a hindrance to performance — they’re a security issue as well. Older APIs lack the robust authentication, encryption, and access controls required to protect modern digital assets. We implement security protocols like OAuth 2.0 and JWT/JWS, helping you safeguard data and ensure compliance.

Limited scalability

The scalability of your applications depends on the quality of their APIs. Legacy APIs often struggle to handle increased demand, limiting your business’s ability to grow and serve new customers. Through our API modernization development services, we can help your business realize its full potential.

Lack of in-house API expertise

Without specialized knowledge, modernizing legacy APIs can be daunting. Solving technical problems in-house can lead to delays, inefficiencies, and expensive workarounds. By partnering with Intellias, you get access to top API experts who can help you achieve your goals quickly and cost-effectively.

High maintenance costs

Legacy APIs can be expensive to maintain. They often require ongoing patching, manual oversight, and complex workarounds to keep outdated systems running. We can help you reduce costs and enhance operational efficiency by implementing APIs that are secure and scalable.

Our API modernization services 

We can help you at every stage of your API modernization journey, from consulting and strategy through deployment and beyond.

Legacy system modernization 

Our expert team specializes in upgrading legacy applications, providing a foundation for seamless connectivity. Whether you’re moving to the cloud, switching to a microservices architecture, or replacing outdated SOAP-based interfaces, we can help you deliver scalable, secure, and future-proof solutions.

API modernization consulting services 

Successful modernization starts with the right strategy. Our API modernization consulting services guide you through the complexity of transforming legacy systems, starting with a thorough API assessment to understand performance bottlenecks, integration challenges, and potential opportunities.

Custom API development

We design and build custom APIs tailored to your specific business needs. Whether you want to launch a powerful new app, enable third-party connections, or update internal systems, our developers can help you leverage custom RESTful APIs, GraphQL, and event-driven architectures to make it happen.

API management and monitoring 

Once an API is launched, you must control, monitor, and continually optimize it to ensure high performance. Our API management services ensure that your APIs perform reliably, scale efficiently, and remain secure as your business grows.

API integration services

Seamless integration is key to unlocking the full potential of modern APIs and the applications they power. Our experts ensure that your APIs connect seamlessly with third-party systems, cloud platforms, and internal software for smooth data transfer and incredible user experiences.

Our approach to API modernization 

At Intellias, we believe that a collaborative, strategic approach to API modernization yields the best results. We work closely with your team to understand your current systems, performance issues, and business goals before delivering API solutions that power business success. To achieve this, we follow a tried-and-tested methodology.

01

Discovery and assessment

We start by performing a comprehensive audit of your existing APIs to understand your current infrastructure, identify pain points, and define goals.

02

Strategy
development

Next, we work with you to develop a roadmap that aligns with your business objectives, outlining the steps and timelines needed to modernize your APIs.

03

Design and
development

With a clear strategy in place, our developers design modern APIs that prioritize performance, scalability, and security.

04

Implementation and integration

We implement your new APIs with precision, ensuring seamless integration with existing systems and third-party connections.

05

Testing and
optimization

We perform rigorous testing to ensure your APIs perform flawlessly under real-world conditions, optimizing for speed, reliability, and scalability.

06

Ongoing management
and support

Post-implementation, we provide ongoing management and support to ensure your APIs remain secure, efficient, and aligned with your evolving needs.

Delivering value to forward-thinking businesses worldwide 

zeekr logo (1)cricut logohere logoHello_Fresh logotravis-perkins-logoRGB_Verdane_Logotype_OceanBlueZooPlus logoTomTom logoDKV-LogoCRX markets logo 1Swissquote logoOMIO_blue 1
API modernization in action: Real-world client stories

Telco modernization and cloud migration

To stay competitive in a rapidly evolving landscape, a leading European telecommunications provider partnered with Intellias to modernize their IT infrastructure.

As part of the project, we helped the client overhaul legacy systems through a comprehensive architectural redesign and cloud migration. The project focused on modernizing APIs, harmonizing internal systems, and adopting a multi-cloud strategy to reduce costs, enhance scalability, and accelerate time to market.

Discover more
API modernization in action: Real-world client stories

B2B API for digital fulfillment

When a UK-based B2B retailer decided to automate their fulfillment process, they turned to Intellias for technical support.

Our expert team built a custom API to enable the business’s large customer base to directly access backend systems for stock queries and bulk orders. At the same time, the new API helped the client streamline operations and reduce manual processes.

Discover more

What our clients have to say 

Mark Andrews
Head of Architecture, Highbourne Group, Trading as City Plumbing 
Charles Webb
Technology Transformation Leader, DD Group
Why choose Intellias image

Why choose Intellias?

With more than 20 years of experience as a leading technology partner, Intellias has guided hundreds of businesses worldwide through digital transformation. API development and modernization play a pivotal role in this journey, unlocking opportunities for our clients to innovate and grow.

We understand that every business is unique. Instead of cookie-cutter services, we offer a tailored approach built on a deep understanding of your business, your team, and your goals. The result is a customized API transformation strategy that aligns with your objectives.

FAQs about API modernization

API modernization is the process of updating legacy APIs and systems to leverage modern architectures, technologies, and standards. Ultimately, it helps improve performance, scalability, and integration.

If your APIs are slow, insecure, or difficult to integrate with third-party tools or mobile platforms, it’s likely time to modernize. We can help you understand your current setup and potential improvements by conducting a thorough API audit.

Yes. Our API modernization development services include seamless integration with legacy applications and systems.

We use industry-standard technologies such as REST, GraphQL, OpenAPI, Node.js, .NET, Java, Spring Boot, AWS Lambda, and leading API management platforms. The exact technologies we use depend on the project, industry, and client needs.

Timelines vary depending on a project’s scope and complexity. Some projects can be completed within a few weeks, while others may take several months. We can provide a detailed timeline after conducting a thorough API assessment.

How can we help you?

Get in touch with us. We'd love to hear from you.

We use cookies to bring you a personalized experience.
By clicking “Accept,” you agree to our use of cookies as described in our Cookie Policy

Thank you for your message.
We will get back to you shortly.