7 API Questions to Ask When Choosing a Recruitment CRM

When comparing recruitment CRM platforms, UK agencies should focus on seven things: who controls API access, what data is available, whether data flows both ways, and how back-office systems connect. The remaining three are how permissions are managed, whether recruitment, sales and marketing data connect, and whether the API helps you get more value from your database.

The strongest API isn't the one with the most endpoints. It's the one that helps recruiters act faster on real opportunities.

For mid-market recruitment agencies in temp and contract markets, speed and visibility directly impact revenue. When candidate, client, placement and billing data sit in different systems, opportunities are lost.

So here are the seven questions to ask.

A quick way to assess any recruitment CRM API

You don't need to be technical to evaluate an API.

Focus on four areas:

• Access: Can you connect tools without vendor delays?
• Coverage: Does it include candidate, client, job and placement data?
• Control: Can you decide what each system can see or change?
• Commercial value: Does it improve speed, visibility or revenue?

If you want a full market view, see our comparison of 10 recruitment CRMs with public APIs in Europe (2026). This guide focuses on what to ask after shortlisting.

1. Can your team create integrations without waiting for the vendor?

Your team should be able to set up integrations in-house, without a vendor request every time your stack changes.

A good recruitment CRM API should let your team manage integrations without supplier bottlenecks.

In Firefish, authorised users create API profiles, set permissions and generate credentials inside the platform.

That matters because recruitment tech stacks change constantly — new payroll tools, automation platforms and comms systems are added all the time.

If every integration needs vendor support, growth slows.

It's also worth asking whether there's a sandbox or test environment to build against, and how the API is documented.

Ask: Can we manage integrations ourselves when our stack changes?

2. Does the API cover the full recruitment lifecycle?

Coverage should run from job through to placement completion, including offers, communications, extensions and terminations.

A strong API should include more than candidates and jobs — it must include placements and activity data.

For reference, the Firefish API covers candidates, contacts, companies, jobs, placements, offers, communications and activity data, including extensions and terminations.

This is critical in temp and contract recruitment, where small changes affect availability, redeployment and revenue.

If a placement changes, your CRM should reflect it instantly across systems.

Ask: Does the API cover the full lifecycle from job to placement completion?

3. Does the API support two-way data flow?

A recruitment CRM API should support read and write access. Connected systems should be able to update core records, not only extract them.

Two-way data flow prevents duplicate or outdated records across systems.

Firefish supports read and write access across candidates, contacts, jobs and placements.

Without write capability, integrations become one-way exports — which quickly leads to conflicting versions of the truth across systems.

Recruiters end up checking spreadsheets instead of trusting their CRM.

Two other things shape what an integration can realistically do: whether the API supports webhooks, so connected systems react to changes rather than polling for them, and what the rate limits are, which determine how much data you can move and how often.

Ask: Can connected systems update data, or only extract it?

4. Can it connect payroll, timesheet and accounting systems?

Placement, pay and charge data should reach timesheet, payroll and accounting systems without manual re-entry.

For temp and contract agencies, API value is proven in back-office automation.

Firefish connects with timesheet, payroll and accounting systems, passing placement, pay and charge data between them.

Timesheet Portal and TBOS are two examples, sending placement and contractor data into back-office systems.

This removes manual re-entry and reduces billing errors.

Ask: Can placements flow directly into payroll and billing systems?

5. How much control do you have over API access?

Permissions should be set per integration, so each connected system reaches only the data it needs.

A secure API should allow granular control over what each system can access.

Firefish uses scope-based permissions and token-based authentication.

This is important because different systems need different levels of access — payroll doesn't need the same data as marketing tools.

Good APIs follow the principle of least privilege. Authentication methods vary between platforms, so check whether access uses OAuth or another token-based approach, and how credentials are revoked.

Ask: Can we control exactly what each integration can see or change?

6. Can the API connect recruitment, sales and marketing data?

Candidate, client, job and activity data should be readable together, so recruitment, sales and marketing teams work from the same picture.

Recruitment opportunities often start in unexpected places — a candidate conversation, a past placement or a client interaction.

If that data sits in separate systems, opportunities are missed.

In Firefish, candidates, contacts, companies, jobs, activity and marketing data sit behind the same API, which is what allows segmentation based on recruitment behaviour rather than static fields.

Ask: Can candidate, client, job and activity data work together across teams?

7. Can it help you get more value from your existing database?

The API should reach the data that makes a database usable: saved searches, candidate preferences, hiring preferences and lead data.

A strong API should activate your existing recruitment database, not just store it.

Firefish research shows agencies are shifting towards database reactivation and higher-quality communication, with 54% prioritising communication quality.

The API supports saved searches, candidate preferences, hiring preferences and lead data, enabling more targeted engagement.

This helps recruiters answer better questions:

• Who in our database is now relevant again?
• Which clients match current demand?
• Where is a past relationship becoming active again?

Most agencies already have the data — the challenge is using it.

Ask: Does the API help us activate our database, not just store it?

What a good recruitment CRM API should actually do

A strong API isn't defined by technical depth alone.

It should:

• Connect recruitment data across systems
• Reduce manual work and duplication
• Improve visibility of commercial opportunities
• Support faster decision-making

For temp and contract agencies, placement and back-office integration is especially important, as it directly affects billing speed and revenue accuracy.

The goal is simple: less fragmented data, faster action, better commercial outcomes.

That's what turns recruitment data into pipeline, placements and repeat revenue.