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Custom API Development

Cut time-to-market and development costs with our API development services. MindK builds custom APIs using REST, GraphQL, SOAP, and gRPC protocols.

Leading API development experts

Since 2009, MindK has been building scalable backends and connecting enterprise systems with the help of APIs. 

Faster development speed, lower costs

With the API-first approach, our developers need less effort to reuse components and upgrade apps.

Better scalability

Build modular applications with decoupled architectures. MindK uses load balancing, API gateways, containers, and autoscaling to handle varying loads.

High availability and fault-tolerance

Well-designed APIs help us build resilient systems that distribute requests across multiple instances. We ensure there's no single point of failure with health checks, circuit breakers, and data replication.

Easier security and compliance

MindK developers use secure API frameworks, code inspection tools, and dedicated security layers. Our DevSecOps services include infrastructure & policy as code, compliance checks in CI/CD pipelines, API secrets management, and robust incident plans.

Build APIs that are secure, scalable, and high-performance.

Our API development services

Our API development company can help you design the right API strategy, define requirements, and turn them into software.

API development success stories

Take a look at some of our 170+ projects across a dozen industries.

  • GraphQL backend for a serverless medical app

    Custom healthcare software, the USA

    MindK developed an AI-powered app that provides 200+ occupational health services. Its backend uses a GraphQL API. This allows us to structure request data as graphs to save bandwidth. The API uses load balancing and AWS Serverless Computing to handle any fluctuations in demand. 

    Challenges solved:

    • Integrating with poorly documented legacy lab systems with an API adapter that converts SOAP/XML to JSON.
    • Developing a GraphQL API for better performance and lower costs with. AWS Lambda autoscaling.
    • Integrating the client’s UI into external systems, allowing partners to order lab tests from inside their own apps.
    • Scoring 92% on AWS Security Hub with the best HIPAA practices for S3 buckets, hardware MFA, EC2, and security groups.
  • Choo i Skyen

    Public REST API for a SaaS CRM system

    Custom SaaS product, Norway

    AlreadyOn is building a cloud-based CRM and an association management application. Some of its new customers requested extensive customization. They also needed to integrate the SaaS app into their own products via an API. 

    Challenges solved:

    • Developing a public REST API.
    • Meeting high availability, scalability, and security requirements.
    • Acquiring 3 large new customers via the API.
  • Aim Analytics

    3rd-party integrations for a unique marketing analytics software

    Data-driven ad management solution, the USA

    MindK helped to develop a first-of-its-kind application for direct-response ad analytics. We integrated the system with a variety of APIs to collect a wide range of data from streaming services, TV, and radio stations. 

    Challenges solved:

    • Integrating Marchex, BVS, and Extreme Reach for data collection and analytics.
    • Process huge files without decreasing performance by integrating AWS Kinesis, AWS Glue, and AWS Lambda.
  • Two-way HIPAA-compliant Salesforce integration

    Custom medical system, the USA

    Our team is developing a massive medical system to connect patients and lactation specialists.

    • HIPAA-compliant integration with the company’s Salesforce as a single source of truth.
    • Google Outlook, eFax, and eSignature integrations.
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    Ensure high non-functional requirements for your APIs – including high availability, fault tolerance, scalability, usability, performance, and security.

    Our API development
    tech stack

    Our API development tech stack Since MindK works with APIs on most projects, we have experience with numerous API development technologies – using both serverless and on-premise (Kubernetes) approaches.
    • NestJS NestJS
    • Express.js Express.js
    • Amazon Web Services Amazon Web Services
    • Microsoft Azure Microsoft Azure
    • DataDog DataDog
    • Prometheus Prometheus
    • Grafana Grafana
    • ELK stack
    • Loki Loki
    • MySQL MySQL
    • PostgreSQL PostgreSQL
    • MongoDB MongoDB
    • ArangoDB ArangoDB
    • Kubernetes Kubernetes
    • Amazon EKS Amazon EKS
    • Azure Kubernetes Service (AKS) Azure Kubernetes Service (AKS)
    • SonarQube SonarQube

    How it works

    The 5-step process we use at our API development company.

    Requirements analysis

    Our Business Analysts and the Tech Lead dive deep into your functional and non-functional requirements. They include the expected user locations, request types and quantity, government requirements, and the frequency of API updates.

    API architecture design

    Based on the analysis, we design a suitable API architecture. Meeting your requirements might include complex data aggregation, compliance measures, infrastructure as code, caching mechanisms, load balancing, autoscaling, Elasticsearch, and various databases.

    Iterative API development

    Our engineers implement the selected design using an Agile approach that accelerates time-to-market. At the same time, we continuously optimize performance and document the API.

    API testing

    Using API virtualization, we can start testing your API as early as possible.

    API monitoring and improvement

    We deploy your API using a secure gateway. MindK keeps monitoring its availability, behavior, and performance.

    Our industry expertise

    Since 2009, MindK has been helping startups, scale-ups, and enterprises in tightly regulated industries.

    Choose your service option

    Why MindK

    We're a custom API development & integration company with 14+ years of experience and over 170 successful projects.

    AWS partners

    MindK became a certified AWS partner to prove our expertise in cloud-native technologies and API development.


    Certified DevSecOps engineers

    Our DevOps engineers integrate compliance checks into CI/CD pipelines and design secure infrastructure as code to protect your systems.


    API performance testing

    We run a variety of server-side performance tests to satisfy your non-functional requirements.


    9/10 clients recommend us

    96% of clients are ready to recommend MindK to their friends and partners. Our client relationships last an average of 5 years.



    • Zaheer Mohiuddin

      Zaheer Mohiuddin

      Co-Founder, Levels.fyi

      Zaheer Mohiuddin

      This isn't your typical outsourcing shop

      «The quality of work and the interactions with the team felt akin to anyone that I've worked within the Bay Area in technology. MindK's expertise is for real and the bar is high. This isn't your typical outsourcing shop, MindK has top-notch engineers and PMs.»

    • Jordan Crone

      Jordan Crone

      Chief Experience Officer, Melody

      Jordan Crone

      communication flow

      «Our project has been going smoother than I could have imagined... It's the first time I've worked with a dev team a distance away that didn't have major (or any, for that matter) hiccups or have things lost in communication. I wish we could snatch them and make them a part of our team.»

    • Al Hariri

      Al Hariri

      Co-Founder, Vitagene

      Al Hariri

      Results-oriented and

      «I can tell you confidently that they are different from your regular agency that just wants to charge as much money for their work as they can get away with. MindK is completely results-oriented and outcome-driven.»

    • Jens Christian Bang

      Jens Christian Bang

      CEO, Already On

      Jens Christian Bang

      MindK always finds a solution

      «We've been successfully cooperating with MindK since 2010. What we were impressed with about people at MindK during all years of partnership — they never give up. We're not worried, as we know that MindK always finds a solution.»

    • Per Otto Larsen

      Per Otto Larsen

      Head of CSR Services, CEMAsys.com

      Per Otto Larsen

      High level of detail
      and thoughtfulness

      «The level of detail and thoughtfulness of what they deliver is so good, that a simple explanation of the next idea serves as the basis for them to take it and turn into reality. MindK’s support allows us to focus on core business, product growth and our customers’ needs.»

      More services to improve your product

      Start your API development now

      Tell us about your challenges and we'll help you
      turn them into an opportunity.

      Frequently Asked Questions

      • What are the 4 types of API?

        Depending on the availability to users, there are four types of Application Programming Interfaces:

        Public APIs are available to external developers with authentication or permission keys in place to track usage.  

        Internal or private APIs restrict access for developers outside the company that owns the API.

        Partner APIs are available to specific companies. They use strong authorization, authentication, and security policies.

        Composite APIs allow engineers to bundle requests to several different APIs. This cuts down the total number of interfaces.

        You can also group APIs depending on the protocols used, including REST, SOAP,  GraphQL, gRPC, and more. You can learn more in our detailed article on APIs.

      • How much does it cost to develop an API?

        API development costs vary from $10,000 to $50,000. Such a wide range is explained by multiple factors that affect the costs. They include the project complexity, API type, quantity of endpoints, technologies and protocols used, and non-functional requirements like security. You can share the project details with MindK to get a more precise quote.

      • How long will it take to build my API?

        API development time varies based on many factors. They include the number of endpoints, integrations, team experience, and non-functional requirements. For large, complex APIs, the entire process takes anywhere from 6 months to over a year. We can accelerate this timeline with Agile methodologies and modern API development frameworks.

      • What engagement models do you offer as an API development company?

        Our engagement models include fixed-price contracts for projects with well-defined requirements. We also offer time and material billing for projects where requirements tend to change over time.

      • How do you ensure that my API is secure?

        MindK follows the latest best practices for API security. Using Amazon Web Services (AWS) gives us access to a lot of helpful services for Web Application Firewalls (WAF), application & infrastructure access control, system monitoring & alerting, and more. We use the platform’s recommended architecture, as well as encrypt the data in transit and at rest if necessary.

      • What factors should I consider when choosing an API development company?

        Before you hire an API developer, consider factors such as the provider’s expertise, experience, and track record. Also, assess their ability to work with your existing systems and provide ongoing support and maintenance.

      • How do I integrate an API into my existing applications?

        The integration process will depend on the specific API and applications you are working with. Typically, you’ll need to get an API key or access token, which allows your application to authenticate and communicate with the API. You then need to write code into your application that uses the API to access data or functionality.

      Our approach

      API development explained

      What is an API in Software Development? Types, Protocols, Examples

      Read more
      api development superhero

      How to Build an API: a Comprehensive Guide

      Read more
      API Testing cover photo

      What is API Testing: Types, Tools, Approach

      Read more

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