ATS integration refers to connecting an applicant tracking system to the other tools a hiring team relies on, including HR information systems, background check and assessment vendors, calendars, email, job boards and single sign-on, so data moves between them without re-entry. Integrations vary widely in depth, cost and who maintains them.
Six categories cover most of what a team actually connects. The HR information system, so a hired candidate becomes an employee record without anyone retyping it. Background check and assessment vendors, so an order is placed and a result returns against the right candidate. Calendar and email, which is what makes scheduling and correspondence work from inside the recruiting tool rather than beside it. Job boards and the careers site, for posting and application capture. Single sign-on, so access follows the same rules as every other business system. Beyond those, teams add an analytics or data warehouse feed, e-signature for offers, and occasionally payroll. The pattern worth noticing is that the highest-value connections sit at the boundaries of the hiring process, where a record changes hands. Teams comparing [ATS features](/ats-features) should start at those boundaries rather than with a long connector count.
Native integrations are built and maintained by the ATS vendor, configured with a few settings, and generally the least trouble. Marketplace or partner integrations are built jointly with the other vendor and listed in a directory. Quality varies with how invested each side is, and support questions can bounce between two companies. Middleware, sometimes called an integration platform, sits between systems and connects things neither vendor supports directly, which is flexible but adds a third subscription and a third place for failures. Custom work means your team or an implementation partner writes the connection, which delivers exactly what you need and becomes yours to maintain forever. Cost and fragility rise as you move down that list. Underneath any of them sits a technical mechanic for moving each event, most often a webhook or a scheduled call, which is a separate topic from this buying decision.
Ask which of the connections you need are native and which were built by someone else, since that determines who fixes them. Ask whether data flows one way or both, and what triggers a sync. Ask what happens when the receiving system is unavailable, and how you find out. Ask which fields transfer and whether custom fields are included, because the standard set rarely matches how a real team works. Ask about cost, since some integrations are included, some sit behind a plan tier, and some require a paid connector on the other vendor's side. Ask for a sandbox or a reference customer running the same combination. Finally, ask who supports it after go-live and get that answer in writing during procurement. A [demonstration of the actual connection](/book-demo) is worth more than a grid of partner logos.
Field mapping is the agreement about which field in one system corresponds to which field in the other, and it is where integrations quietly go wrong. Two products rarely model the same concept identically. One stores a single full name, the other first and last. One has a fixed list of departments, the other free text. Date formats and country codes differ. Unmapped fields silently drop, and a mismatched picklist writes values that only surface as nonsense in reporting months later. Ownership is the second half of the problem. Decide which system is authoritative for each piece of data, so that when the ATS and the [HR information system](/ats-vs-hris) disagree about a job title there is a rule instead of an argument. Write the map down, review it whenever either system changes, and test with real records rather than clean sample data.
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