HRMS migration
Field-level mapping, validation, and rollback between Unicorn ATS and BambooHR. We move data and schema; workflows are rebuilt natively in BambooHR.
Unicorn ATS
Source
BambooHR
Destination
Compatibility
7 of 10
objects map 1:1 between Unicorn ATS and BambooHR.
Complexity
BStandard
Timeline
4-8 weeks
Overview
Moving from Unicorn ATS to BambooHR is a platform-type migration: you are moving from a dedicated applicant tracking system into an HRIS platform whose ATS module is a thin layer over the core employee database. BambooHR's Hiring module handles job postings, candidate tracking, and basic offer management but lacks the pipeline customization, AI screening, and reporting depth of purpose-built ATS platforms. We migrate Candidates, Jobs, Employee Records, Custom Fields, Interview records, and Offer data while acknowledging that BambooHR's ATS is designed for teams hiring fewer than one or two roles per month at organizations with straightforward, non-matrixed structures. Activity history, which Unicorn ATS typically exports as flat CSV without candidate record IDs, is reattached through a fuzzy-match process on name, email, and application date. Workflows, automations, and scorecard templates do not migrate; we deliver a written inventory of these for the customer's admin to rebuild in BambooHR or a connected ATS if the organization's volume outgrows BambooHR's ATS limits.
Every standard and custom field arrives verified.
AI proposes the map; you confirm before any record moves.
Parent–child, lookups, and ownership stay linked.
Calls, emails, meetings — with original timestamps.
Documents, uploads, and inline notes move with the record.
Why teams make this switch
Leaving
What's pushing teams away
Choosing
What's pulling them in
Object mapping
Each row shows how a Unicorn ATS object lands in BambooHR, including any object-level transformations, lookup resolution, or schema-design dependencies.
Typical mapping — final map is confirmed during the sample migration step.
Unicorn ATS
Candidate
BambooHR
Applicant (within BambooHR Hiring)
1:1Unicorn ATS candidate records (name, contact information, resume, source channel, and application date) map to BambooHR Applicant records attached to Job openings. BambooHR flattens applicants as records directly linked to job postings rather than using a separate Candidate-to-Application split. We extract resume files as attachments linked to the Applicant record. Candidate source attribution migrates to BambooHR's standard source tracking fields. Any candidate status or stage history from Unicorn ATS is preserved as a note on the Applicant record because BambooHR does not natively store pipeline stage progression history per applicant.
Unicorn ATS
Job Requisition
BambooHR
Job Opening
1:1Unicorn ATS job records (title, department, location, employment type, posting dates, and hiring manager) map to BambooHR Job Opening records. BambooHR's Job Opening object includes the posting content, hiring team, and applicant pipeline view. We map the Unicorn ATS requisition status (open, paused, closed) to BambooHR's job status. Department and location mapping requires configuration in BambooHR's organizational structure before migration.
Unicorn ATS
Pipeline Stage
BambooHR
Applicant Status (within Job)
lossyUnicorn ATS pipeline stages (application through offer and hire) do not map directly to a named pipeline object in BambooHR. Instead, BambooHR uses per-job applicant status labels (Applied, Screening, Interview, Offer, Hired, Rejected) that are configurable per job opening. We document the current stage names and order from Unicorn ATS and create a BambooHR status configuration that mirrors the original funnel for each job. Stage automation rules from Unicorn ATS do not migrate; we inventory them for the customer's admin to configure in BambooHR's Hiring Settings.
Unicorn ATS
Employee Record
BambooHR
Employee
1:1If Unicorn ATS contains employee records (as distinct from candidate profiles), these map to BambooHR Employee records with fields including start date, department, job title, manager assignment, employment status, and compensation. BambooHR's employee data model includes tabs for Personal Info, Employment Info, Compensation, Time Off, and Benefits. We map source fields to their corresponding BambooHR employee fields and flag any custom employee fields that require BambooHR custom field configuration before migration.
Unicorn ATS
Custom Field (Candidate)
BambooHR
Custom Field (Applicant)
lossyUnicorn ATS custom candidate fields require explicit mapping to BambooHR Applicant custom fields or standard fields. BambooHR supports custom fields for Applicants with limitations: dropdown list fields require the exact option values to exist in BambooHR before migration; multi-select list fields are supported only if all values match; information fields and section headers do not migrate via API. We extract custom field definitions from Unicorn ATS, validate them against BambooHR's custom field type support, and pre-create the destination field schema in BambooHR before any applicant data imports.
Unicorn ATS
Custom Field (Employee)
BambooHR
Custom Field (Employee)
lossyUnicorn ATS employee custom fields map to BambooHR Employee custom fields. BambooHR limits which employee tabs accept custom fields (custom fields cannot be added to the Time Off, Benefits, Performance, or Onboarding tabs via API). We audit the source employee custom field set and map only to BambooHR-supported locations, flagging any source fields that have no valid BambooHR destination. Required-field constraints in BambooHR employee records must be satisfied at migration time or the record import fails.
Unicorn ATS
Interview Record
BambooHR
Interview (within Applicant Activity)
1:1Unicorn ATS interview records (scheduled date and time, interviewer assignments, interview type, and outcome notes) map to BambooHR Interview records attached to the Applicant. Interview scorecards from Unicorn ATS do not have a native BambooHR equivalent; we preserve scorecard data as a structured note attached to the Interview record. Interview scheduling data is mapped to BambooHR's interview scheduling fields, though BambooHR does not include native two-way calendar sync with external calendars for interview scheduling without third-party integration.
Unicorn ATS
Offer Record
BambooHR
Offer (within BambooHR Hiring)
1:1Unicorn ATS offer records (compensation details, start date, offer status, and approval workflow history) map to BambooHR Offer records associated with the Applicant. BambooHR offers an offer letter template feature with variable fields for compensation and start date. Approval routing logic from Unicorn ATS is not configurable in BambooHR in the same way; we document the original approval sequence and flag it for the customer's admin to configure within BambooHR's offer settings or through a separate approval tool. Offer history migrates as structured records with status preserved.
Unicorn ATS
Activity Note and History
BambooHR
Note (attached to Applicant)
1:1Unicorn ATS recruiter notes, email logs, and general activity history attached to candidates are among the hardest records to migrate. Most ATS platforms export activity logs as flat CSV with no linkage to the candidate record ID that can be automatically re-associated. We run a fuzzy-match process on candidate name, email, and application date to reattach activity history to the correct BambooHR Applicant record. We present the customer with a preview of unattached records (typically 5-15% in our experience with flat-CSV exports) before committing to the activity migration scope. Any activity records that cannot be confidently matched are exported as a separate reference file for manual lookup.
Unicorn ATS
Hiring Manager Assignment
BambooHR
Employee (as Hiring Team member)
1:1Unicorn ATS hiring manager assignments on job requisitions map to BambooHR Employee records added to the Hiring Team on the corresponding Job Opening. We resolve Unicorn ATS hiring manager references by email against BambooHR Employee records, provisioning any missing employee records if the hiring manager is not yet in the BambooHR system. BambooHR's hiring team permissions are job-specific rather than department-specific, which is a known limitation for matrixed organizations; we flag this during scoping for organizations with complex reporting structures.
| Unicorn ATS | BambooHR | Compatibility | |
|---|---|---|---|
| Candidate | Applicant (within BambooHR Hiring)1:1 | Fully supported | |
| Job Requisition | Job Opening1:1 | Fully supported | |
| Pipeline Stage | Applicant Status (within Job)lossy | Fully supported | |
| Employee Record | Employee1:1 | Fully supported | |
| Custom Field (Candidate) | Custom Field (Applicant)lossy | Fully supported | |
| Custom Field (Employee) | Custom Field (Employee)lossy | Fully supported | |
| Interview Record | Interview (within Applicant Activity)1:1 | Fully supported | |
| Offer Record | Offer (within BambooHR Hiring)1:1 | Fully supported | |
| Activity Note and History | Note (attached to Applicant)1:1 | Fully supported | |
| Hiring Manager Assignment | Employee (as Hiring Team member)1:1 | Fully supported |
Gotchas + challenges
Platform-specific issues from each side, plus the pair-specific challenges that don't show up on either platform's page on its own.
Unicorn ATS gotchas
Activity logs export as flat CSV, losing record associations
Migration timeline scales non-linearly with data volume
Dirty data imported from source pollutes the destination
BambooHR gotchas
Undocumented API rate limits can trigger 503 errors
Per-employee pricing model requires active record count verification
API credentials must be sent on every request to avoid extra round trips
Custom field schema varies per account and requires manual inventory
Document and attachment exports are not covered by standard report exports
Pair-specific challenges
Migration approach
Discovery and data audit
We audit the source Unicorn ATS instance across all active objects: candidate volume, job openings, employee records, custom field sets, interview records, offer history, and activity log volume. We assess data quality by flagging duplicate candidate records, records with missing required fields, and any job requisitions with outdated posting dates. We document the pipeline stage configuration, workflow rules, and scorecard templates for the automation inventory. The discovery output is a written scope document with record counts, data quality assessment, and a recommendation on whether BambooHR's native ATS is sufficient or whether the organization should pair BambooHR HRIS with a dedicated ATS integration.
Data cleaning and deduplication
We strongly recommend a data-cleaning phase of at least two weeks before migration. During this phase we generate a deduplication report identifying candidate records sharing the same email address, job requisitions with no attached candidates in the past 12 months, and employee records with missing required fields for BambooHR import. The customer reviews and approves the deduplication decisions (merge, archive, or delete). Custom field schema is validated against BambooHR's supported field types, and the destination field configuration is built in BambooHR before any data import begins.
Activity log re-attachment preparation
We run a fuzzy-match process on the exported activity CSV against the cleaned candidate list, using name, email, and application date as matching criteria. We generate a match confidence score for each activity record. Records scoring above 85% confidence are auto-assigned; records below 85% are flagged for manual review. We present the customer with the unattached record count and a sample of low-confidence matches before committing to the activity migration scope. Any records that cannot be confidently matched are exported as a reference file and excluded from the automated migration.
BambooHR schema configuration
We configure the BambooHR destination environment before migration: creating custom Applicant fields matching the validated Unicorn ATS custom field schema, configuring per-job applicant status labels to mirror the original pipeline stages, setting up the Hiring Team structure for each active job opening, and confirming the employee organizational hierarchy (departments, job titles, manager relationships). The configuration is validated in BambooHR's staging or test environment before production migration begins.
Production migration in dependency order
We run production migration in record-dependency order: Employee records (establishing the HRIS foundation), Job Openings (with status and department mapping), Applicants (with resume attachments and source attribution), Custom Field values (mapped to pre-created BambooHR fields), Interview records (with scheduling data and scorecard notes), Offer records (with compensation and approval status), and Activity history (via API batch import with fuzzy-match parent resolution). Each phase emits a row-count reconciliation report before the next phase begins. Active candidates in mid-pipeline are flagged for priority migration to avoid disruption to ongoing hiring.
Cutover, validation, and automation handoff
We freeze Unicorn ATS writes during the cutover window, run a final delta migration of any records modified during migration, then mark BambooHR as the system of record. We validate a random sample of migrated records against the source and present the customer with a migration summary report including record counts, unattached activity count, and any import errors. We deliver the automation and workflow inventory document to the customer's admin team for rebuild in BambooHR. We support a one-week post-migration window for reconciliation issues. We do not rebuild workflows, automations, or scorecards as part of the standard migration scope.
Platform deep dives
Unicorn ATS
Source
Strengths
Weaknesses
BambooHR
Destination
Strengths
Weaknesses
Complexity grading
Standard HRMS migration. 1 of 7 objects need a mapping; the rest are 1:1.
Overall complexity
Standard migration
Derived from compatibility, mapping clarity, API constraints, and data volume across Unicorn ATS and BambooHR.
Object compatibility
1 of 7 objects need a mapping; the rest are 1:1.
Field mapping clarity
Field mapping is derived from defaults — final spec confirmed during the sample migration.
Timeline complexity
7-object category — typical timelines run 2–7 days end-to-end.
API constraints
Unicorn ATS: Not publicly documented..
Data volume sensitivity
Unicorn ATS doesn't expose a bulk API — REST + parallelization used for high-volume runs.
Estimator
Rule-based pricing — no per-record fees, no manual quotes. Migrations over 2M records are scoped individually.
Step 1
Pick a category, then your source and destination platforms.
Category
FAQ
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