Senior Software Engineer (Remote)

About the role

FirstWork is building the next generation of agentic AI products for frontline hiring, the work that gets roughly 80% of the world's workforce hired, verified, and paid.

We're looking for a Senior Software Engineer to own a significant part of the platform and ship the AI capability that runs on top of it.

In this role, you'll lead projects end to end, from the first design doc through rollout and follow-through, collaborating closely with product managers, designers, and the engineers building our AI infrastructure. You'll set the standard for the engineers around you and see your work meet live enterprise volume every week.

The scale we run at

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~50,000 workers a week move through our hiring and onboarding flows.

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2.5 million API requests a day across the platform.

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Millions of document pages a year processed by AI agents, across 40+ countries and a dozen-plus languages.

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Single accounts running hundreds of thousands of AI document extractions in one month, and compliance engines evaluating thousands of customer-specific rules per tenant.

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Global staffing, logistics, healthcare, marketplace, and employment platforms across the US, UK, EU, LATAM, and India.

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Billing on work performed, per document validated and per agent action executed, which makes product design, cost per unit, and gross margin one conversation.

What you'll do

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Own a subsystem end to end document processing, workflow automation, compliance rules, communications, or integrations; and lead the projects inside it from design doc through rollout.

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Ship AI agent capability into production: extraction and validation pipelines, confidence handling, human review routing, and the feedback loop that raises accuracy document type by document type.

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Build AI browsing agents that drive government and third-party portals through the browser, where the only interface is the UI.

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Own accuracy and cost for the AI you ship, across prompts, structured output, evaluation, model selection, and spend per document.

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Design and evolve the REST APIs and webhooks that customer ATS, HR, and payroll integrations run on.

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Write durable async workflows in Temporal for automations, AI jobs, and bulk actions, built so that a retry is always safe.

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Design schema and data models that hold up as tenants, volume, and product surface grow.

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Improve latency and throughput with production evidence: profile it, fix it, prove the win.

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Raise the engineering bar around you through design review, code review, and mentoring.

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Work directly with product and operations to turn a customer's real process into product.