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Custom API Offerings

API Integration

Integrate existing business systems or third-party APIs to harness data and feature sharing in your applications.

Custom API Development Services

Custom APIs securely extend the functionality of your application with new and existing third-party systems and devices.

API as a

Build an API first business by building APIs as a Service (APIaaS) targetting common web protocols including HTTP/HTTPS, XML, JSON, REST, SOAP.

Automated API Testing Services

We use Unit testing, Functional testing, and Load testing to check the performance of individual APIs, end to end functionality, and performance of API layers.

Cloud Integration

Connect applications and data across multiple clouds by building API layers for business services using Mulesoft, Azure, Dell Boomi, etc.

Microservices Consulting Services

Break monolithic applications into a suite of microservices so that each service is configured to run as a unique process and can be changed independently.

Benefits of working with

Integrator experienced with API driven approach

With the rise of API first business movement, companies are opening up access to their functionalities and data for newer revenue generation streams. Opening up opportunities for mission-critical business applications and new software applications to build on top of these APIs.

Simform has been a proponent and system integration partner of many PaaS, SaaS, and Software solutions like Twilio, Dell Boomi, Amazon AWS, Google Cloud, Nexmo, Stripe, Cloudera, etc. We have worked hand-in-hand with them to develop and integrate a range of APIs for b2b and consumer-facing applications. Our API integration projects aim to save you money by reducing development time and cut costs.

Review and assessment

First, let us assess the API documentation of different providers and suggest the best fit. We then define the target architecture of apps and help refactor monolithic apps if needed.

Standardized API development

We expertise in a large variety of APIs using SOAP, REST and XML-RPC as well as JSON and other protocols. We also help develop APIs for mobile, desktop browser apps, databases, and intranet systems.

APIs designed for scale

Our APIs only expose the right pieces of your applications securely and efficiently. Evolutionary architecture gives flexibility for incremental additions. APIs are made to be platform independent so that any app can call the APIs.

Recent case studies

Customer testimonials

Our API development process

Sprint planning

Sprint roadmap is a collective planning effort. Team members collaborate to clarify items and ensure shared understanding.

Tech architecture

We break monolithic apps into microservices. Decoupling the code allows teams to move faster and more independently.

Stand-ups & weekly demos

Stand ups, weekly demos, and weekly reviews make sure everyone is on the same page and can raise their concerns.

Code reviews

Code reviews before release help detect issues like memory leaks, file leaks, performance signs, and general bad smells.

Industries We Serve

  • Sales
  • Marketing
  • Communication
  • eCommerce
  • Logistics
  • Social Login
  • Weather
  • Navigation

Sales API integration

Integrate Sales API into your Custom Software to seamlessly manage your CRM with in-built phone and email, to-dos, appointment, pipeline views and lead management.

Marketing & automation

Automate your marketing on-the-go! Manage your audience, find new customers, target custom audience, ad creation & management, reporting and analytics.

SMS & e-mail gateway integration

Integrate communication APIs to send sms and email from your mobile app with custom user targeting, user analytics, scheduling and drip marketing.

Shopping API integration

Integrate your e-commerce software with shopping platforms. Update product catalogues & details, user analytics and inventory from a single platform.

Shipping gateways

Integrate shipping capabilities directly to your mobile applications or e-commerce websites that helps you align your shipping & logistics activities.

Social login gateways

Simple sign-in process for end users using third-party social login providers, accesses richer user profiles, gaining additional information & user analytics.

Weather API integration

Get access to current weather data, hourly forecasts, UV index, air pollution and much more directly into your application by integrating weather APIs.

In-built maps integration

Integrate maps API into your mobile application to get seamless navigation, traffic forecasts, satellite & street view and saved places.

Tech stacks

Our API solutions

Integrate & Develop bespoke API with Simform Solutions

Payment Gateways

  • Paypal
  • Authorize.net
  • 2Checkout
  • BillDesk
  • PayU
  • EBS
  • Sage Pay


  • FedEx
  • UPS
  • USPS
  • DHL
  • EasyPost
  • Shippo
  • Gooten

SMS Gateway Integration

  • Nexmo SMS
  • TeleSign SMS
  • Twilio SMS and Lookup
  • D7SMS
  • Telnyx
  • MessageBird SMS
  • Octopush SMS
  • ClickSend

Social Network API Solution

  • Facebook
  • Instagram
  • Twitter
  • YouTube
  • Pinterest
  • Snapchat
  • Tumblr
  • Viber
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Simform Guarantee

  • Flexible, efficient scaling
    Flexible, efficient scaling

    Expand or reduce your remote team size on demand.

  • Team of 1,000+ engineers
    Team of 1,000+ engineers

    Access vetted experts in the tech stack of your choice.

  • Long-term predictability
    Long-term predictability

    Simform’s average engagement duration is 2 years.

Work with us


Custom APIs allow businesses to manage software-to-software integration between different apps smoothly. For example, the ability to share your favorite Spotify song on Instagram stories is due to the power of custom APIs. It has alleviated the way we assemble our applications. By making use of one another’s functionality, apps have enhanced the way they communicate with each other. In modern app development services, custom APIs play an important role since they allow us to innovate faster.

In general, businesses have their own specific requirements. Using the readily available APIs won’t be sufficient to cater to their own unique integration needs. This is where businesses are required to develop custom APIs that fits their requirement and helps in better product development.
The 3rd party API integration is the integration of APIs developed by a 3rd party (Facebook, Twitter) in one's custom software to gain partial access to services, features or functionalities for better business process.

A 3rd party API is an API developed by a 3rd party. By integrating these APIs, 1st parties can gain partial access to the features and functionalities of 3rd party services. Next time when you book an Uber, take a close look at the Maps. These maps are available due to the 3rd party integration of Google Maps API with Uber.
There are 7 types of APIs, however, the most commonly used are web services APIs. These are a piece of a software or system available that provides access to its services through a dedicated URL over the internet. These types of APIs pass the information in a way that is easy for other software to understand or parse. For example, Flicker API http://www.flickr.com/services/api/.

Web service APIs uses HTTP or HTTPS for information exchange. Whenever the client software wants to communicate, it sends an HTTP request which is returned with a HTTP response from the API. During these requests, the information is passed in the URL itself. The common types of web services API are


However, the widely used web service API is REST. REST APIs are known for providing faster communication due to less usage of internet bandwidth.
To deliver API development services with the user-centric approach, we have divided the whole process into simple steps:

1: Understand the API’s purpose and audience
2: Align your Team
3: Develop your API Incrementally
4: Define KPIs
5: Collecting and Acting on Feedback
6: Marketing the API
Managing a remote team is not easy. There are critical mistakes you can make when trying to leverage the vast amounts of remote talent.

Simform team integrates into your team, participating in standup and scrum meetings, weekly demos, weekly retrospectives.

Daily stand-ups - We do daily stand-ups where everyone gets on a video chat and tells you what they are working on that day and the previous day.

Weekly demonstrations - This one is simple: get everybody on a video chat, share screens, have people show their work, and then talk about it.

Weekly Retrospectives - A weekly retrospective is where you all collectively review what went well and what could have been improved based on the demo.

Have more questions?

Let us know and our experts will get in touch with you ASAP.

Talk to our experts