Blog>Human Resources

Greenhouse's API for Custom Integrations

Evgeniya Ioffe - January 26th 2024 - 6 minutes read

In the ever-evolving landscape of recruitment, the power to tailor your technological tools to meet unique organizational demands has become not just an advantage, but a necessity. Greenhouse, a leader in recruitment software, offers an array of APIs designed to unlock a world of custom integration possibilities. From seamlessly embedding innovative functionalities into your existing systems to enhancing the candidate experience, mastering Greenhouse's APIs opens the door to endless customization and efficiency. In this comprehensive guide, we will journey through the capabilities of Greenhouse’s APIs, pragmatically craft effective custom integrations, navigate the common challenges inherent in such technological endeavors, and finally, explore the tangible impacts these integrations have on team efficiency and the overall recruitment process. Prepare to transform your recruitment operations and propel your team towards unprecedented success.

Exploring the Capabilities of Greenhouse’s APIs

Greenhouse’s APIs offer a broad spectrum of capabilities designed to extend and customize the Greenhouse platform to meet specific organizational requirements, encompassing five main areas: the Harvest, Job Board, Assessment, Ingestion, and Onboarding APIs. Each API plays a critical role in facilitating seamless data flow and interaction between external systems and the Greenhouse ecosystem. The Harvest API, for example, is pivotal for creating high-level integrations such as HRIS, candidate offer, and job approval integrations. It provides comprehensive access to the internal workings of Greenhouse Recruiting, allowing for both the extraction of candidate and job information through GET endpoints and the ability to perform actions through POST, PUT, PATCH, and DELETE endpoints. This API is instrumental in automating and enhancing internal productivity tools by leveraging full access to Greenhouse Recruiting data.

The Job Board and Assessment APIs target more specific functionalities within the recruitment process. The Job Board API enables the creation of custom career pages by allowing programmatic access to job listing information and the submission of applications directly into the Greenhouse system, thus facilitating a seamless candidate experience from the initial job search to application. The Assessment API, on the other hand, enhances the candidate selection process by enabling the integration of third-party assessments, including coding tests, video interviews, and personality tests. By allowing these external systems to push test options and updates directly into Greenhouse Recruiting based on predetermined job stages, it ensures that the assessment process is both streamlined and efficiently managed within the Greenhouse ecosystem.

Lastly, the Ingestion and Onboarding APIs focus on sourcing candidates and streamlining the onboarding process, respectively. The Ingestion API is particularly useful for building new sourcing integrations, offering methods to source candidates and prospects from third-party systems into Greenhouse Recruiting and to retrieve the stage and status of existing candidates. Meanwhile, the Onboarding API facilitates the creation of custom integrations aimed at improving and personalizing the onboarding experience. By allowing external systems to interact with and update Greenhouse data in real-time, these APIs collectively enhance the recruitment and onboarding processes, making them more adaptable, efficient, and tailored to the unique needs of each organization.

Designing Effective Custom Integrations with Greenhouse

To effectively leverage Greenhouse's APIs for custom integrations, it's paramount to initiate with a clear understanding of your organizational needs and how these align with the capabilities offered by the APIs. Before diving into the technical development, identifying the processes within your recruitment operations that could benefit from automation or enhancement via API integration is crucial. Whether it's streamlining the way job offers are generated and approved, improving the background check process, or creating more dynamic job boards, the goal is to identify specific areas where API integration can solve a problem or create value. This strategic alignment ensures that the integration will not only be successful but also sustainable and scalable, addressing both immediate needs and supporting long-term business objectives.

From a technical standpoint, establishing a secure and efficient connection to Greenhouse's APIs involves a few key prerequisites. Firstly, securing developer resources—whether in-house or external—is essential for the creation and maintenance of the custom integration. These developers will need to work with middleware platforms, such as Mulesoft, Boomi, or Workato, to ensure the smooth transposition of data between your systems and Greenhouse. Additionally, creating a mapping schema is necessary to ensure that data fields from your applications correctly map to those within Greenhouse Recruiting. This step is critical in avoiding data mismatches and ensuring data integrity. Emphasizing the security of data transfer and API interactions is also crucial, underscored by implementing robust authentication and encryption measures to protect sensitive information.

Adhering to best practices for API integration can significantly enhance the integration experience and outcome. This includes thorough testing in a controlled environment before full deployment, to identify and resolve any issues with data flow or functionality. Regularly updating the integration to accommodate any changes in the Greenhouse API or your internal systems is also essential for maintaining the effectiveness of the integration over time. Moreover, documenting the integration process and creating clear guidelines for its operation can facilitate smoother maintenance and troubleshooting. By following these guidelines, businesses can maximize the potential of their custom Greenhouse integrations, leading to a more streamlined, efficient, and responsive recruitment process.

Navigating the complex terrain of API integration, especially with a rich and multifaceted platform like Greenhouse, presents an array of challenges. One prominent issue is data security, a critical concern when transferring sensitive information between systems. Ensuring that data remains secure while in transit and at rest requires implementing robust encryption protocols and managing access controls meticulously. Additionally, the integration process may be hindered by rate limiting, where the number of API calls exceeds the limits imposed by Greenhouse, resulting in potential data delays or losses.

To address these concerns, teams can employ several strategies. For data security, it's essential to use secure transport protocols like HTTPS for all data exchanges and to leverage OAuth for authentication, ensuring that only authorized users and systems can access the API. Middleware platforms can play a crucial role here, acting as secure intermediaries that manage data flow and transformation securely. Regarding rate limiting, a creative workaround involves implementing efficient caching mechanisms to reduce the number of API calls needed, as well as designing your integration to batch requests and spread them out over time to stay within the rate limit boundaries.

Furthermore, mapping discrepancies between the data models of third-party systems and Greenhouse can create integration headaches, necessitating a comprehensive understanding of both schemas to ensure accurate data mapping and transformation. This often involves custom development work to create an adapter layer within the middleware that can translate and map data fields correctly between systems. Regular communication between development teams and clear documentation of data structures and transformations can mitigate these issues, ensuring a smoother integration process that enhances the capabilities of both the Greenhouse platform and the third-party system involved.

Evaluating the Impact of Custom Integrations on Team Efficiency and Candidate Experience

Custom integrations using Greenhouse's APIs have a profound influence on team efficiency by streamlining recruitment workflows. For example, an HRIS integration can automate the transfer of candidate data into employee records, reducing manual data entry and the possibility of errors. This not only saves time for HR professionals but also allows them to focus on more strategic tasks, such as talent development and employee engagement. Furthermore, integrating background check and assessment tools directly into the recruitment process can speed up decision-making, ensuring that top candidates are identified and engaged more swiftly. The accelerated workflows contribute to a more efficient team operation, maximizing the productivity of each recruitment cycle.

On the candidate side, custom integrations can significantly enhance the application and onboarding experience. By creating a seamless journey from the initial application through to onboarding – for instance, via custom job boards that directly feed into the Greenhouse system or automated offer letter generation – candidates encounter a streamlined process that is both engaging and professional. This not only improves the candidate's perception of the organization but also increases the likelihood of acceptance when an offer is extended. Such positive experiences can turn successful candidates into brand ambassadors, amplifying the company's appeal to future talent.

Considering these improvements, it's crucial for organizations to measure and analyze the impact of their custom integrations on both team efficiency and candidate experience. This could involve tracking key metrics such as time-to-fill, candidate satisfaction scores, and the ratio of offers accepted. By systematically assessing these outcomes, organizations can identify areas for further refinement, ensuring their recruitment process remains agile and responsive to the evolving demands of both the business and its prospective employees. Encouraging a culture of continuous improvement in this way ensures that the benefits of custom integrations are fully realized, driving sustained advantages in recruitment efficiency and effectiveness.


Greenhouse's APIs for Custom Integrations offer a wide range of capabilities and benefits for organizations in the recruitment process. By utilizing these APIs, businesses can tailor their technological tools to meet specific organizational demands, automate workflows, enhance the candidate experience, and improve team efficiency. The article discusses the capabilities of Greenhouse's APIs, provides guidance on designing effective custom integrations, offers solutions for navigating challenges, and evaluates the impact of these integrations on team efficiency and the candidate experience. Key takeaways include understanding organizational needs, securing developer resources, emphasizing data security, addressing rate limiting, resolving mapping discrepancies, and measuring the impact of custom integrations on recruitment processes.