Custom API Development Services

For more than a decade, we've developed highly secure and resource-efficient custom APIs for enterprise-grade apps—and consumer facing products.

We help businesses of all sizes rapidly develop custom APIs that enable new applications and strengthen their core competencies.

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Our Custom API Development Advantages

Our experienced team provides many benefits: our clients enjoy fast delivery, high quality of service, advanced technology and other perks.

Fast Iterating

You can use our custom API development services to add some critical features to your current app—or build a brand-new product from scratch. We’ll deliver spectacular results within the shortest time possible!

Expenses Optimization

When it comes to time and money, our investment in software is low-risk. We can save you 50% on development costs compared to the industry average speed of implementation.

Our extensive experience in custom API development will give your product a boost by launching quickly and staying within budget.

Smart Scaling

Custom API development services let you keep up with your customers' demands by scaling and adding new features without losing capacity.

Custom Api Software Products We Developed

Laravel Agile ReactJS React Native WordPress
A Pet Sitting Community

MadPaws is a Sydney-based pet services startup. 6 members of the A2 Design team are currently working with the Mad Paws team to develop the main site backend (Laravel framework), frontend, blog (WordPress CMS), and mobile applications (React Native framework).

Raised $5 million of investments through Series A funding from investors including Qantas, and Airtasker CEO Tim Fung.

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React.js React Native Node.js Ruby on Rails WordPress
Online Tutoring Marketplace

TutorTime is an Australian based tutoring marketplace founded by team of expert educators.

The marketplace allows you to choose an individual tutor for any subject within the school curriculum, as well as extracurricular leisure activities (sports, art).

The Tutoring Marketplace is available through the web interface and through mobile applications for iOS and Android.

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Custom API Development Services We Provide

Private APIs

Build native applications for Android or iOS and reach a broad audience segment. We build solutions that run on any device, regardless of its operating system.

Public APIs

Make your software available to partners so they can incorporate it into their own apps, allowing you access to a wider potential market.

E-commerce API Integration

You can connect your app to external services, take orders with custom payment gateways, share sales data—including tax and shipping information—with your accounting system, send orders to a warehouse for fulfillment by way of an integration with Google or Apple services that tracks deliveries in real-time.

CRM API integration

Using a CRM API, sync all information into one central location to eliminate issues of multiple data sources. Get the ability to manage leads directly from your email like Gmail or Outlook so that you can engage with prospects more effectively through email marketing and not miss important notifications.

Payment API integration

Payment APIs can make the checkout process more enjoyable and seamless for both merchants and customers by allowing businesses to incorporate payment processing capabilities into their existing software.

With payment APIs or gateway services, online retailers can issue refunds for online payments, enable recurring subscriptions for SaaS-based businesses and track customer orders.

Logistics API integration

Third-party logistics companies need to provide shippers and carriers with information exchange, as well as facilitate connections between them and cloud providers. APIs—such as JSON or XML—allow for seamless integration by connecting ERPs, TMSs, WMSs (and finance systems).

Our Custom API Development Process

A2 Design provides full-cycle services for development of custom APIs. We’re passionate about creating great software, and we continually strive to improve our skills and processes. We have an established workflow that allows us to create applications quickly and efficiently.

1. Discovery and Ideation

During the discovery phase, we gather your requirements for an API and create a plan to build it. Once those steps are complete, we provide you with cost and timeline estimates. The discovery phase is essential because it helps you reduce the likelihood of failure, ensures that you’re getting exactly what you want — and if not, gives you time to make changes.

2. API Design

To ensure scalability and high-quality software, we design the API architecture.

A well-designed API is easy to understand, use, and maintain.

It should follow consistent style conventions, include built-in security mechanisms for authentication and data encryption, and reliably handle large volumes of traffic.

The first step in designing an API is to clearly define its business use case.

An API that is responsible for an authentication workflow will have different requirements than an API that allows a user to browse a product catalog, so it's important to align on the use case before making any other decisions.

The second step is to decide how each resource should be structured, what sort of data it will need to contain, and how the information should relate to other resources.

It's also important to determine which levels of abstraction and encapsulation you want in your API, so that you balance reusability with legibility.

The product needs to be easily accessible: lightweight registration, testing features and documentation included.

3. Custom API Development

It's time to make the concept a digital reality by creating an API that can handle any component and is up-to-date with technology.

Our teams of developers use a combination of the test-driven development (TDD) and agile methodologies to produce software that meet market demands.

4. Maintenance and Support

Our team offers maintenance plans that cover a range of services, from emergency fixes to long-term support and product updates.

5. Further Development

We continue to make improvements after an API launch in order to guarantee smooth and error-free app operation. To do this, we keep an eye on performance indicators (such as the response time of the server) and user input (to respond quickly if there are any issues).

A clear understanding of how a product is used by real users makes it easier to plan new business development phases, prioritize features and create long-term roadmaps.

How much does it cost?

Expect that your business needs will be recognized and met when you choose our custom API development services. Because of our expertise, we can come up with workable solutions that adhere to any set of needs and financial constraints.

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Benefits you get with A2 Design custom API development services

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We care about projects we work on

Intuitive API design

We ensure that the user experience is smooth, so developers don't have to waste time learning how to work with our API. We save them time and resources by ensuring a seamless process from start to finish.

Smart authentication

Advanced authentication provides control over who has access to an API, including paying customers and business partners.

High-level security

API authentication rules protect your endpoints and server resources by preventing unauthorized use. We build role-based permission systems that enforce strong access controls to prevent the abuse of all or specific parts of your API.

Complete documentation

Our documentation clearly explains what kind of data developers can request from our system and how they should format the requests.


Our APIs can grow or shrink their capacity depending on your team’s or customers' needs. So, if you're starting with 100 users and want to expand tenfold within a month, we can handle that without sacrificing performance.

High speed

Our custom APIs are designed to respond within 100 milliseconds— a rate that ensures your applications will run smoothly and quickly.

80% of our clients work with us
for more than one year


We wanted to automate our business and reduce administrative costs. A2 Design developed multiple components for us: Sales CRM, mobile drivers app, invoicing and dispatching modules, and much more. A2 used agile approach to cater for our ever-changing and growing needs and developed a software that allowed us to face everyday challenges! They were very helpful so the project was very successful.

John Estrada


First of all I'm very satisfied. Words can not express my satisfaction and the professional work from Alex, the head of A2 Design Team. But not only the work was superb, the contact, the conversations, the UNDERSTANDING and the good portion of humanity was the key to successful job. Next time I don't need to look, I already found the right person for every job. RESPECT!

John Macintosh


Very fast and effective work, met all my expectations and much more. A very competent team, who I definitely recommend to anyone! Thank you very much!

Andrew Hersch

Frequently Asked Questions

We’re glad to answer your questions about our custom API development services.

  • What is API development? >

    API development is the creation of programming interfaces that allow apps or websites to interact with other software.

    It includes all the code needed to build out a database, server and application — from migrating databases to custom API integration services.

  • Is API development time consuming? >
    Yes, API development takes time. However, if you choose experienced and reliable API development consultants at A2 Design, you will get your APIs right on time.
  • What technologies does A2 Design use to develop APIs? >
    We use the most innovative and latest technology to develop our APIs. REST, JSON, OAuth, are frequently used, but we are certainly not limited to only these. If you have certain requests when it comes to the intricate technicalities, our highly qualified team would be more than willing to accommodate them.
  • Do we sign an NDA? >
    We do, indeed. We always sign an NDA as a SaaS development company to protect your organization's confidential information, project information, and intellectual property. Our first goal is safeguarding the trade secrets and privacy of our clients.

Contact us

Let's discuss your project in more detail! P.S. If you want to offer any other proposals or you are searching for a job, please send a message here: SALES@A2DESIGN.BIZ