Top 4 Win-Back & Reactivation Calls for Engineering Recruiting Firms

Most engineering recruiting firms are sitting on a database they never work. Candidates who were placed two years ago, engineers who were screened but never placed, hiring managers who sent three roles in 2023 and then went quiet. The research is blunt about what that's worth: re-engagement outreach to people who already know your firm converts at 8 to 15 percent, versus 1 to 3 percent for cold outreach to strangers, according to industry data compiled for recruiting firms. Add personalization and it climbs higher. The problem is that nobody on your team has time to call 2,000 dormant contacts, and a single "just checking in" email sequence rarely cuts through. In 2026, you have real options: managed AI calling services, recruiting CRM sequencers, ATS-native automation, and human-agent reactivation shops. This guide compares four that genuinely fit the win-back use case for engineering recruiting firms, so you can pick the one that matches your stack, your budget, and your tolerance for running campaigns yourself.

#1 My AI Call Center — Calling starts at 9¢ per connected minute, tiered by volume. Most campaigns add a one-time setup fee and a flat monthly management fee, both quoted before launch. No per-seat charges, no platform bill, and the rate is locked for the campaign.

My AI Call Center is a done-for-you managed outbound calling service that runs structured, AI-powered calling campaigns against approved, permissioned, or reviewed contact lists only. It never does indiscriminate cold calling, which matters for recruiting firms: your dormant candidates and past clients are people with a relationship to your firm, and the service treats them that way. Owned and operated by AIQ Labs, with a base in Halifax, Nova Scotia and an operating presence in Austin, Texas, the company's pitch is simple: run more useful calls without building a bigger call center. You buy campaigns that the team runs for you, each scoped around one clear goal and quoted before launch. For an engineering recruiting firm, the Win-Back & Reactivation Calling campaign typically targets contacts dormant for 12 to 24 months, exactly the window where lapsed candidates and past clients live. There's also a Database Reactivation Blitz option: a structured multi-touch campaign across calls, texts, and emails, run over two to four weeks. Outcomes route back into the CRM and scheduling tools you already run, so a hot candidate transfers to your team live or lands in your ATS workflow with a disposition code attached. Every campaign ends with a named outcome report: dispositioned contact list, outcome counts, routed follow-ups, completion report, and opt-out and DNC logs. What separates the service is list discipline and pricing honesty. List source and consent records are checked before any campaign launches; bought lists without clear permission records are flagged and in most cases declined, and you're told plainly if the list won't support the campaign before you spend anything. Compliance is built in: AI voices are treated as artificial voices under the TCPA, prior express consent is required, AI disclosure happens on every call, opt-outs are logged and honored immediately, and state-specific quiet hours are respected. The rate is locked for the campaign, and the company commits to reporting what actually happened, with no invented numbers.

Best for: Engineering recruiting and staffing firms that want a hands-off, compliance-first way to reactivate dormant candidates and past clients without buying software or hiring callers.

#2 Gem — $5,000 to $12,000 per year depending on team size, according to the research.

Gem is a candidate CRM and sequencing platform purpose-built for recruiting, and according to the research it's a strong fit for candidate win-back at white-collar firms. It sits on top of your ATS and LinkedIn and manages multi-step outreach sequences to candidates and passive prospects. For re-engagement, you can build a segment like "last active 12 to 24 months ago, placed in [skill category]" and run a four-step sequence across LinkedIn InMail and email automatically. The recruiter personalizes the first message and the follow-up touches run on their own. Responses route back to the owning recruiter's Gem inbox, synced with the ATS, which matters when a lapsed engineer replies and needs to land with someone who has context. It's worth being clear about what Gem is and isn't. It's a sequencer, not a calling service: the touches are written, not spoken, so it covers the email and LinkedIn side of a win-back program rather than the phone side. The research also notes that client win-back, meaning former hiring manager re-engagement, is not its primary design use case. It's candidate-focused, so an engineering recruiting firm running both candidate and client reactivation would need a separate tool for the client side. Still, for firms with 5 or more recruiters doing active sourcing, the LinkedIn integration and attribution routing are hard to beat.

Best for: Contingency and retained search firms in white-collar verticals with 5 or more recruiters doing active sourcing.

#3 Herefish by Bullhorn — Bundled with Bullhorn Enterprise licensing; standalone pricing varies by firm size. Contact Bullhorn for current rates.

Herefish is an automation and engagement platform built specifically for Bullhorn ATS users, and if your engineering recruiting firm runs Bullhorn, it's the most tightly integrated win-back option in this list. According to the research, Herefish reads directly from Bullhorn's candidate and contact records, identifies lapsed contacts by date-last-contacted, and runs multi-step email and SMS sequences without any data export. The trigger fires from Bullhorn itself: a candidate record whose date_last_updated passes a threshold automatically enters the win-back sequence. That's a real advantage, because the automation runs on live ATS data rather than a stale spreadsheet you exported six months ago. Herefish also supports both candidate and client contact sequences in one platform, which addresses a gap that pure candidate tools like Gem leave open. A firm can run one workflow for dormant engineers and another for past hiring managers who haven't sent a role in 12 months, both from the same system. The obvious limitation is the flip side of the strength: it's not useful if you're not on Bullhorn, and its reach outside the Bullhorn ecosystem is limited. Pricing is bundled with Bullhorn Enterprise licensing, and standalone rates vary by firm size, so you'd need to talk to Bullhorn for current numbers.

Best for: Recruiting and staffing firms already running Bullhorn that want zero-friction, ATS-native win-back automation.

#4 Loxo — $119 to $179 per user per month, according to the research.

Loxo combines an ATS, a CRM, and an outreach sequencer in a single platform, and for smaller engineering recruiting firms that haven't separated those systems, it offers the fastest path to a working win-back workflow. According to the research, Loxo's "people intelligence" layer scores candidates by recency and relevance, and a filter for "candidate in your ATS, last contacted 12 to 18 months ago, in [skill category]" produces a win-back segment in minutes. The outreach module sends email sequences from the recruiter's own email address, with follow-up scheduling handled automatically. The single-platform simplicity is the draw for boutique firms of roughly 3 to 10 recruiters that can't justify a separate Gem plus Bullhorn stack. The trade-off is redundancy: if your firm is already invested in Greenhouse or Lever as its ATS, Loxo's ATS becomes an expensive duplicate, and a sequencing-only tool that integrates with your existing ATS is usually the better call. Loxo also doesn't handle phone outreach, so firms that want actual reactivation calls, not just email sequences, will need to pair it with a calling service. At $119 to $179 per user per month, it's competitive for teams in that middle band.

Best for: Boutique engineering recruiting firms of 3 to 10 recruiters that want ATS, CRM, and outreach in a single product.

The right win-back tool depends on where your dormant pipeline lives and who's going to work it. If your engineering candidates and past clients are in Bullhorn, Herefish automates re-engagement straight off live ATS data. If you're a boutique firm without a separated stack, Loxo gets a sequence running in minutes. Gem is the strongest option for LinkedIn-heavy candidate re-engagement at firms with several recruiters. And if what you actually want is for someone to pick up the phone and call your 12 to 24 month dormant list for you, My AI Call Center runs the whole campaign as a managed service, with consent-checked lists, AI disclosure on every call, outcomes routed back into your CRM, and pricing from 9¢ per connected minute that's locked before launch. The first campaign review is free, and you'll know the full number before you approve anything. Book a campaign review at myaicallcenter.app and find out what your dormant database can actually produce.

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