Jack is an AI-powered hiring platform transforming how talent is evaluated and distributed.

We:
• Automate job applications for candidates
• Rank candidates inside ATS systems
• Replace keyword screening with signal-based matching

Jack enables companies to reduce resume review time while improving candidate quality and enables job seekers to access more opportunities with less friction.

Jack

The company pairs Medicare beneficiaries with a dedicated healthcare advocate who navigates appointments, insurance, and care coordination on their behalf. Customers get the support of caring nurses while AI agents do the tedious backend work, all covered by Medicare. Today, 24/7 personalized health assistance is only available to the rich or extremely sick. Our vision is for everyone to be able to afford a health assistant who knows your health history deeply, navigates the healthcare system on your behalf, and propels you to become the healthiest version of yourself. Founded in 2025, backed by leading venture capital firms and top Silicon Valley angel investors. 9 employees, $6.5M total funding.
ResponsibilitiesAutomate tasks healthcare advocates currently do manually, including outbound voice calls to insurance, doctors, pharmacies, and patientsBuild and improve agentic search and multi-agent orchestration systems that coordinate across complex healthcare workflowsDesign evaluation infrastructure to measure and improve the quality of AI automations so advocates increasingly rely on themImplement reinforcement learning loops that use real nurse actions to train and improve models over timeShip fast and iterate directly with the team that listens to real conversations daily
Requirements1-10 years of experience in AI/ML engineering, building systems including voice AIHas shipped voice AI and agentic/LLM-powered systems to production (not demos)Production voice AI stack: streaming STT/TTS, telephony, latency optimization, endpointingAgentic systems: context engineering, multi-agent orchestration, tool use, RAGBuilt evaluation pipelines for voice systems - metrics, regression suites, production signalExperience as a founder or from a stalling later-stage company, or Big Tech with prior startup experienceRapid learner who thrives in ambiguity - builds the playbook rather than following oneWilling to relocate to SF in Q1 2027
Benefits$180K-$220K base salary plus competitive equity, higher for exceptional candidatesOpen to visa sponsorship (e.g. OPT, H1B transfers)

Senior AI Engineer — Voice Systems

What the job involves