What Is an ATS? A Practical Guide to Applicant Tracking
Learn how an applicant tracking system connects job requests, applications, interviews, offers and onboarding while improving hiring visibility.
What Is an ATS? A Practical Guide to Applicant Tracking Systems
Recruitment becomes difficult to manage when applications are spread across job boards, shared inboxes, spreadsheets and individual recruiter notes.
The immediate problem is administrative: teams cannot quickly see where each candidate is in the process. The wider problem is strategic: the organisation cannot measure why hiring takes too long, which sourcing channels perform well or where qualified candidates disengage.
An applicant tracking system creates a structured hiring workflow from requisition to onboarding.
What is an applicant tracking system?
An applicant tracking system, or ATS, is software used to collect, organise and manage candidates throughout the recruitment process.
A modern ATS can support:
Job requisitions
Approval workflows
Career sites
Job posting
Application capture
Candidate profiles
Screening
Interview scheduling
Evaluation forms
Offer approvals
Talent pools
Hiring analytics
Onboarding handover
The ATS should operate as a system of record for recruitment, not merely as a database containing uploaded résumés.
How does an ATS work?
A hiring need becomes a requisition
A manager or HR user creates a request describing the role, location, employment type, required capabilities, target start date and budget.
The request moves through the appropriate approval route before recruitment activity begins. This reduces the risk of advertising roles without confirmed authority or budget.
The role is published
Recruiters create the job posting and publish it through the company career site and relevant recruitment channels.
A connected process helps the organisation maintain one approved version of the role description.
Applications create candidate profiles
Candidates can apply through a career portal, referral programme, recruitment event or job-board integration.
Each application should be linked to the relevant vacancy while retaining the candidate’s wider interaction history. If the same person applies for another role, recruiters should be able to identify the existing profile.
Candidates move through a defined pipeline
Recruiters review applications and move suitable candidates through stages such as:
New application
Initial screening
Recruiter conversation
Hiring-manager review
Interview
Assessment
Offer
Hired or closed
The stages should be configurable because a graduate role, technical position and senior leadership search will not follow identical processes.
Feedback is captured
Interviewers complete structured evaluation forms. Recruiters can compare feedback without collecting separate spreadsheets or searching through email threads.
The selected candidate enters onboarding
Once the offer is accepted, approved candidate information can be transferred to onboarding and the core HR platform.
Core ATS capabilities
Job requisition management
The system should record why the role is needed, who approved it and which budget or organisational unit it belongs to.
Candidate relationship history
Recruiters should see the candidate’s applications, communication, interviews, evaluations and status changes in one profile.
Configurable pipelines
Each hiring process should have appropriate stages, owners, notifications and decision points.
Interview coordination
Calendar connectivity, automated invitations and interviewer reminders reduce scheduling delays.
Structured evaluation
Scorecards and role-related questions create a more consistent basis for discussion than unstructured impressions.
Offer management
The ATS can route compensation and offer details through an approval workflow before documents are sent to the candidate.
Reporting
Recruitment teams need visibility into speed, conversion, source quality, workload and candidate outcomes.
HR platform integration
A successful hire should transfer into onboarding and employee records without unnecessary re-entry.
How an ATS shortens time to hire
It removes repeated data collection
Candidate information is captured once and made available to authorised participants throughout the process.
It makes stalled candidates visible
Recruiters can identify candidates waiting for manager review, interview feedback or offer approval.
It automates routine communication
Acknowledgements, interview instructions and status updates can use approved templates and triggers.
Automation should support communication rather than create impersonal or misleading messages.
It reuses existing talent
Recruiters can search previous applicants and talent communities before starting a search from zero.
It accelerates internal collaboration
Managers receive access to the candidates they need to review without downloading résumés or maintaining separate lists.
It connects hiring with onboarding
Approved candidate data can create onboarding tasks, document requests and the initial employee record.
ATS versus spreadsheets
A spreadsheet can provide a list of candidates, but it has significant limitations as a hiring system.
Hiring activitySpreadsheetATSCandidate recordsManual rowsConnected profilesRésumé storageSeparate filesAttached to profilePipeline trackingManual status updatesWorkflow stagesManager feedbackEmail or commentsStructured scorecardsInterview schedulingSeparate calendarConnected workflowCandidate messagesManually sentTemplates and triggersReportingFormula-dependentReal-time dashboardsAccess controlFile-levelRole-basedAudit historyLimitedUser and event historyOnboarding handoverManual re-entryIntegrated transfer
The difference is not simply convenience. An ATS creates process visibility that a shared spreadsheet cannot reliably provide.
Recruitment metrics an ATS should support
Time to fill
Time to fill measures the period between the approved hiring need and the completed hire. It helps organisations understand workforce-planning speed.
Time to hire
Time to hire focuses on the candidate journey, commonly measuring the period from entry into the active process to acceptance.
Stage conversion
Conversion rates show how candidates move between application, screening, interview and offer stages.
Time in stage
This metric identifies bottlenecks. A high-quality pipeline can still perform poorly when candidates wait too long for feedback.
Source performance
Teams can compare candidate volume, qualified applicants, interviews and hires by source.
Offer acceptance
Low acceptance may indicate issues with compensation, process speed, role clarity or candidate experience.
Candidate withdrawal
Understanding when candidates leave the process can reveal excessive delays or unclear communication.
Metrics should diagnose the process, not encourage recruiters to move candidates quickly at the expense of hiring quality.
Candidate experience and communication
An ATS can improve candidate experience when it supports timely, accurate and respectful communication.
Good practices include:
Confirming receipt of the application
Explaining major recruitment stages
Providing interview instructions
Avoiding unnecessary requests for duplicate information
Updating candidates when timelines change
Communicating closure respectfully
Offering accessible application and interview options
Directing privacy questions to the appropriate channel
Automation should not send a rejection message before the responsible recruiter has confirmed the decision.
Responsible use of AI in applicant tracking
AI can assist with:
Drafting role descriptions
Structuring résumé content
Suggesting potentially relevant candidates
Creating role-related interview questions
Summarising interview notes
Identifying pipeline patterns
However, ranking models may reproduce patterns from historical hiring decisions. An apparently neutral algorithm can disadvantage candidates if it learns from biased outcomes or uses irrelevant proxy data.
Organisations should therefore:
Use job-related selection criteria
Test for unequal outcomes
Keep human review
Explain how recommendations are used
Allow users to challenge or override suggestions
Avoid relying on photographs or unrelated personal characteristics
Review models and configurations regularly
AI should help recruiters find relevant evidence—not replace accountable hiring decisions.
Candidate data and access control
Candidate records may include contact details, work history, education, interview feedback and compensation expectations.
A well-designed ATS should support:
Clear privacy information
Purpose-based data collection
Role-based access
Configurable retention periods
Deletion or anonymisation workflows
Consent or communication preference records where required
Controlled downloads and exports
Audit history
Secure integration with other HR systems
Hiring managers should only access candidates connected with the roles they are authorised to review.
How to choose an ATS
Ask providers to demonstrate:
Requisition creation and approval
Career-site application
Duplicate candidate detection
Configurable pipeline stages
Hiring-manager access
Interview scheduling
Structured scorecards
Candidate communication
Offer approval
Retention and deletion settings
Recruitment analytics
Onboarding and HRIS integration
AI explainability and human override
Mobile recruiter and manager experience
A useful demonstration should follow one candidate through the complete journey rather than showing disconnected feature screens.
Frequently asked questions
Is an ATS only for large organisations?
No. Smaller organisations with recurring recruitment activity may benefit from replacing shared inboxes and spreadsheets with a structured workflow.
Does an ATS automatically reject candidates?
Some systems can apply configured screening rules, but organisations should use automation carefully and retain appropriate human review.
Is a career site the same as an ATS?
No. The career site is the candidate-facing application experience. The ATS manages recruitment activity behind it.
Can previous applicants be contacted about new roles?
Potentially, subject to the organisation’s privacy notice, retention policy, communication preferences and applicable requirements.
What happens after a candidate is hired?
An integrated system can transfer approved information into onboarding, employee records and other core HR workflows.
Build a connected journey from applicant to employee
HR&Tomorrow ATS connects requisitions, applications, candidate pipelines, interviews, evaluations and offers. Once the selected candidate accepts, the process can continue into digital onboarding and employee records.
Request an HR&Tomorrow demo to see how a connected ATS can reduce administrative delays and create a clearer hiring experience.