How much does it cost to hire a REST API developer?

The cost to hire a REST API developer is on average $65 per hour, though there is a large range of hourly prices for developers who create and integrate REST API. The total hourly rate range is $56/h and goes up to $76/h, according to Glassdoor.com

How expensive is a REST API call?

The cost of a REST API call varies between providers, the type of call in question, and how much their services you use. The prices may go as low as $0.01 per call, but most of the APIs have free tiers that come with limited numbers of calls. It’s best to check their website for pricing details from an API provider.

How much does a custom API cost?

The price of a custom API differs depending on the complexity, functionality, the rate of the development team, and time. Less complex APIs are done within $2,000 to $10,000 for light tasks, which take 1–2 weeks to perform. More complex APIs are done from $10,000 up to $50,000 or even more and take several weeks or months. Besides, hosting, maintenance, and support are associated with recurring costs, generally adding $100-$500 per month to your infrastructure and $1,000-$5,000 per year to support. Generally, this is what freelancers charge: $50-$150 per hour, while agencies usually charge $100–$300 per hour. Comprehensive security measures and detailed documentation may also increase the project cost.

Is API development profitable?

Yes, API development can be profitable nowadays. This is not only because there is a huge demand for integration and increased functionality of businesses. But, also because of the different models of generating revenue that include subscriptions, pay-per-use, freemium, and licensing. Besides that, scalability and reusability of APIs reduce development costs connected with expansion, while trends in the market, like the growth in microservices, IoT, and mobile applications, increase the need for APIs. It is also worth noting that new features are generally associated with better user experiences, and higher retention rates, and can also speed up innovation; therefore, APIs act as a solid accelerator of growth in the tech space.

API stands for Application Programming Interface. It is basically a middleman that enables different software programs to talk between themselves and interchange data. API defines methods and data formats that may be used by applications to request information and exchange data. APIs are joining the different services and applications, including web services, mobile apps, and cloud platforms, allowing functions like data retrieving, updating, and communication of various software components to be carried out.

How long does it take to build a REST API?

Building a REST API can take between 1-2 weeks for a somewhat simple API with simple CRUD operations and minimal authentication. A medium-complexity API that has multiple resources with basic authentication and some advanced features would take 4–8 weeks to engineer. An API with even more advanced features like OAuth authentication, rate limiting, integration with multiple services, and detailed documentation can run into several months of development time. Again, the duration will vary depending on the experience of the engineering team and the requirements for the API.

What is the best technology to build REST API?

The best tech for your REST API really depends on your experience and the nature of your project. For beginners, Flask (Python) or Express.js (JavaScript) will do just fine due to their relative user-friendliness. On the other hand, quite complex projects— like those needing scalability, high performance, and strict maintenance — might need Django or Spring Boot. Also, pick the technology that works with your favorite programming language.

Are REST API developers still in demand?

Yes, REST API developers are still in high demand due to business needs: relying on APIs for integrating systems, enabling data exchange, and building scalable applications. The need for skilled REST API developers remains strong. Additionally, they play a vital role in facilitating seamless data flow and enhancing overall system functionality and performance.

Can I test the developer skills during the no-risk trial period?

Yes, you can assess a REST API developer’s abilities during the trial phase. We provide a risk-free paid evaluation period for new clients – up to 20 hours, enabling you to evaluate the developer’s performance on assignments before committing to a subscription. In case of underperformance and if the developer does not meet expectations, we will introduce you to another remote developer under our guarantee of risk-free replacement.

How quickly can I hire a REST API developer through Lemon.io?

You can hire a REST API developer through Lemon.io in 48 hours – this time is enough to manually check the relevant REST API developers in our community and find the perfect candidate for you. All the candidates who have already joined the community are pre-vetted, which means that our recruiters have already checked their CVs, the candidates have successfully passed the screening calls and tech interviews, and they are ready to join the interview with the client.

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Why hire REST API developers through our platform?

by Inna Chernova

Recruiting Lead at Lemon.io

Verified Expert

Hiring Guide: REST API Developers

If you’re planning to hire REST API developers, you’re investing in the backbone of modern web and mobile applications. REST (Representational State Transfer) APIs power data communication between systems, allowing scalable, secure, and efficient exchanges between clients and servers. Skilled REST API developers ensure your software ecosystem is robust, interoperable, and optimized for performance.

Why Hire REST API Developers?

Hiring a REST API developer ensures your applications can communicate seamlessly across platforms and devices. These developers design well-documented, secure APIs that follow industry standards—enabling smooth integration with frontend interfaces, third-party services, and cloud infrastructure. A well-built REST API improves system reliability, scalability, and developer productivity by providing a stable foundation for your product.

Core Responsibilities of REST API Developers

Design and develop RESTful APIs for web, mobile, and enterprise systems.

Implement secure authentication and authorization using OAuth2, JWT, or API keys.

Write clean, scalable code for data exchange and application integration.

Collaborate with front-end and mobile developers to ensure consistent data delivery.

Integrate APIs with third-party services such as payment gateways or CRMs.

Monitor API performance and manage versioning, scalability, and rate limits.

Maintain clear API documentation using Swagger, Postman, or OpenAPI specifications.

Key Technical Skills to Look For

Languages & Frameworks: Node.js, Python (Flask/Django), Java (Spring Boot), PHP (Laravel), Ruby on Rails, or Go.

API Standards: RESTful principles, JSON, XML, HTTP methods (GET, POST, PUT, DELETE).

Security: OAuth2, JWT, HTTPS, CORS configuration, rate limiting, and API gateway design.

Testing: Postman, Jest, Mocha, or Pytest for API testing and automation.

Database Integration: MySQL, PostgreSQL, MongoDB, or Redis.

Version Control & CI/CD: Git, GitHub Actions, Jenkins, or CircleCI.

Documentation Tools: Swagger/OpenAPI, Redoc, and API Blueprint.

When to Hire REST API Developers

When building or expanding backend infrastructure for web or mobile apps.

When connecting third-party applications or cloud services to your system.

When improving performance, scalability, and reliability of existing APIs.

When migrating from monolithic systems to microservice architectures.

When establishing secure integrations with partner platforms or internal services.

How to Hire the Right REST API Developer

1. Define Your Integration Needs

Determine what your API should accomplish—data delivery, user authentication, or external service integration. This clarity helps identify whether you need backend developers, full-stack engineers, or API specialists.

2. Evaluate Practical Experience

Experienced REST API developers understand API architecture, error handling, rate limiting, and scalability patterns. Review their experience with frameworks and tools like Express.js, Flask, or Spring Boot, and request examples of live APIs they’ve deployed.

3. Interview Questions

What are the key principles of RESTful architecture?

How do you handle authentication and authorization in REST APIs?

Explain how you’d version an API while maintaining backward compatibility.

How do you handle rate limiting and request throttling?

What’s the difference between REST and GraphQL?

Describe how you monitor and optimize API performance.

4. Practical Assessment

Ask candidates to design and implement a simple REST API for managing users and posts. Assess code readability, error handling, and adherence to REST conventions.

Average Cost of Hiring REST API Developers

Developer rates vary based on experience and tech stack expertise:

Junior Developers (1–3 years): £35–£55/hour

Mid-Level Developers (3–6 years): £60–£90/hour

Senior Developers (7+ years): £100–£140/hour

By hiring through Lemon.io, you can access pre-vetted REST API developers who specialize in building secure, scalable, and high-performance APIs across multiple industries.

Why Hire Through Lemon.io?

Lemon.io connects businesses with skilled REST API developers who understand how to create clean, well-documented, and efficient APIs. Whether you need to build an API from scratch or optimize existing integrations, Lemon.io ensures you find developers who can deliver reliability and scalability for your backend systems.

Hire Expert REST API Developers →

Hire Node.js Developers – Build high-performance RESTful APIs using JavaScript and Express.

Hire Python Developers – Create clean, scalable APIs with Flask or Django REST Framework.

Hire Go Developers – Develop ultra-fast, concurrent backend APIs for cloud systems.

Hire Backend Developers – Strengthen your infrastructure and manage complex integrations.

Hire GraphQL Developers – Enhance data queries and streamline modern API development.

FAQs About Hiring REST API Developers

What does a REST API developer do?

A REST API developer designs, builds, and maintains APIs that allow data exchange between systems using RESTful architecture and HTTP protocols.

What technologies are used for REST API development?

Common technologies include Node.js, Python (Flask/Django), Java (Spring Boot), PHP (Laravel), and Go for backend API development.

How do REST APIs differ from GraphQL?

REST uses fixed endpoints for resources, while GraphQL allows flexible data queries in a single request, minimizing over-fetching or under-fetching data.

How can I ensure my REST API is secure?

Use HTTPS, implement OAuth2 or JWT authentication, validate inputs, and limit request rates to prevent abuse and unauthorized access.

Can I hire remote REST API developers through Lemon.io?

Yes. Lemon.io connects you with vetted remote REST API developers experienced in secure, scalable backend integrations.

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Why hire REST API

Over 6500 companies use REST API as their main framework, including giants like Google, Amazon and Lyft.

High-quality web apps

REST API's modular approach lets devs reuse components, so they can seamlessly manage app complexity.

Faster development process

REST API's architecture and a vast library of pre-built components speed up development, so you can get to market sooner.

Enjoyable user experience

From smooth, responsive interfaces to reduced loading times, devs can use REST API to boost usability.

Scaling made easy

REST API's modular, component-based architecture makes it easy to scale applications as traffic grows.

Case studies

Aerospace

The experience with Lemon.io has been fantastic. The interview process has been good, the caliber of people – excellent and integration has been very smooth.