Handle SmartRecruiters Posting/Customer API rate limits, concurrency limits, and offset pagination

Steps

1. Paginate list endpoints using offset and limit query params, reading totalFound from the response's ListResult wrapper (SmartRecruiters does not use page/pageSize).
2. Watch the X-RateLimit-Limit and X-RateLimit-Remaining response headers — most Customer API endpoints allow about 10 requests/sec.
3. Note tighter per-endpoint limits: roughly 2 req/sec for job publication (POST/DELETE /jobs/{id}/publication) and offer-document downloads.
4. Track concurrency separately via X-RateLimit-Concurrent-Limit/Remaining — most endpoints cap at 8 concurrent requests, but GET /candidates is capped at 1.
5. For bulk data needs, use the Reporting API instead of paginating the Posting/Candidates API directly.
6. Set client timeouts of 128 seconds or more and randomize request timing to avoid synchronized retry storms.