---
title: 'Full-Stack Engineer at Ascertain'
canonical: 'https://feeny.ai/job/full-stack-engineer-ascertain-new-york-vgybmc02fvjv'
type: 'job'
last_seen: '2026-09-12'
---

# Full-Stack Engineer at Ascertain

- **Company:** Ascertain
- **Location:** New York, NY
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-09-10
- **Last confirmed live:** 2026-09-12
- **Apply:** https://jobs.ashbyhq.com/ascertain/1382a9d7-d036-41df-971c-d067d5856dd2

## Job description

Meet Ascertain Ascertain is building AI agents to automate the administrative work that burdens care teams. We are in major health systems and large specialty groups, saving hundreds of staff hours every week. Our backers include Northwell Health, New York’s largest health system, and Deerfield Management, a leading healthcare investment firm. Together, we’re on a mission to restore time, trust, and focus to the people who keep healthcare running. Our work is urgent — not because of startup timelines, but because our customers rely on us to drive financial resilience and operational clarity in a system under strain.

As a Full-Stack Software Engineer at Ascertain, you'll ship product across the stack — from backend services and data infrastructure that power Ascertain’s healthcare AI platform to the web app that our partner operations team members use every day. You'll join a growing team of engineers, with real ownership over what we build, how we build it, and the engineering culture we grow into. We're headquartered in New York City with a hybrid team there. We operate with high autonomy, shared accountability, and deep respect for the people who use our software.

## What you'll do

- Own product features end-to-end, from design through production.
- Build user-facing experiences in React and TypeScript.
- Design and ship backend services with Python and FastAPI.
- Partner with product, design, and engineering peers to turn fuzzy problems into shipped software.
- Raise the bar in code review and help shape our engineering practices.
- Improve our development processes as we grow — testing, CI/CD, observability — the things that compound over time.

## What we're looking for

- 7+ years strong full-stack experience with Python (FastAPI or similar) and TypeScript with React.
- Comfort designing schemas and writing non-trivial SQL against relational databases (we use PostgreSQL).
- Working knowledge of containerization (Docker) and CI/CD pipelines.
- Ability to communicate clearly in English, written and verbal — most async work happens in writing, and you'll regularly join meetings with U.S.-based teammates.
- Meaningful overlap with U.S. Eastern business hours during the workday.
- Experience building AI agents

## Nice to have

- Experience in regulated environments (healthcare, fintech, etc.) and a security-minded approach to design.
- Infrastructure-as-code experience (Terraform).
- Familiarity with Redis, queueing systems, or other parts of a modern production stack.
- Background in ambiguous, early-stage environments where you've had to take ownership without much scaffolding.

## Who you are

You're excited — not just willing — to learn new things, push past your comfort zone, and ship in a fast-moving environment. You communicate clearly, take ownership without being asked, and care about the people on the other end of your code.

## Benefits & Perks

- Cutting-edge technology: Work directly with the latest advancements in generative AI and automation, tackling challenging problems that meaningfully impact healthcare.
- Ownership & growth: You’ll join Ascertain at a pivotal early stage, shaping our products, technical direction, and culture, with significant opportunities for career advancement.
- Collaborative team: Join a talented, passionate, and supportive team with backgrounds from top tech companies and clinical institutions.
- Competitive compensation: We offer competitive salary, meaningful equity, comprehensive health insurance, and more.

Why Ascertain? Make a real difference: Your work will directly impact healthcare organizations and improve patient care. Join Ascertain in transforming healthcare with AI!

## About Ascertain

## Company Overview
- **One-liner**: Ascertain provides an agentic AI platform that automates healthcare administrative workflows—prior authorizations, referrals, eligibility checks, care coordination, and claims management—across health systems, providers, and payers.
- **Entity Type**: Private (startup); raised $17.4M total (Seed + Series A)
- **Headquarters**: New York, New York, United States
- **Founded**: 2022
- **Founders**: Founded by a team of healthcare operators and technologists, including CEO Mark Michalski, MD (former healthcare executive) and CPO Eli Bernstein (others from Northwell Health and Aegis Ventures) [ascertain.com](https://www.ascertain.com/company) [linkedin.com](https://www.linkedin.com/company/ascertain-ai)

## Core Business
- **Primary industry**: Healthcare IT / AI-powered healthcare operations automation
- **Target customers**: B2B – health systems, specialty practices, management service organizations (MSOs), and health plans
- **Mission**: “To fundamentally transform medicine and create a more equitable healthcare future by addressing operational inefficiencies at scale” [linkedin.com](https://www.linkedin.com/company/ascertain-ai)

## Products & Services
Ascertain’s platform is a unified AI agent system that automates end-to-end care management and revenue cycle workflows. Key modules include:
- **Prior Authorization Automation**: Submits, reviews, and follows up on prior authorizations, reducing workload by up to 95% in pilot studies.
- **Referral Management**: Ingests unstructured data and automates referral processing.
- **Eligibility Verification**: Real-time checks integrated into existing workflows.
- **Care Coordination**: Automates discharge planning, care gap identification, and case management.
- **Claims Management**: Streamlines claims submission, denials, and appeals with built-in auditability.
- **Utilization Management**: Automates reviews and compliance checks.
- **Human-in-the-Loop**: Every process embeds human review for transparency and control [ascertain.com](https://www.ascertain.com/)

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Key Metric (Total Funding)**: $17.4M (Seed $7.4M in March 2024, Series A $10M in May 2025)
- **Notable Investors / Partners**: Deerfield Management (Series A lead), Northwell Health (strategic partner and investor), Aegis Ventures (co-founder/sponsor) [linkedin.com](https://www.linkedin.com/company/ascertain-ai) [ascertain.com](https://www.ascertain.com/company)
- **Growth Signals**:
  - Headcount: 31 employees (93.1% YoY growth) [linkedin.com](https://www.linkedin.com/company/ascertain-ai)
  - Pilot with Northwell Health: reduced user clicks by 80% and authorization submission time by 67% [ascertain.com](https://www.ascertain.com/)
  - Partnership with The Oncology Institute (100+ oncology clinics) went live in 8 weeks [ascertain.com](https://www.ascertain.com/)
  - Partnership with Cardiovascular Associates of America (CVAUSA) [ascertain.com](https://www.ascertain.com/)
  - Claims ROI in under 90 days [ascertain.com](https://www.ascertain.com/)

## Competitive Advantages
- **Healthcare-native design**: Built by former healthcare operators who understand workflow complexity.
- **Agentic AI, not RPA**: Platform adapts to new rules in real time, ingests both structured and unstructured data, and operates with explainable, auditable guardrails.
- **Fast deployment**: Live in 8 weeks; ROI measurable in months.
- **Transparency & compliance**: Human-in-the-loop, built-in audit trails, and compliance-ready for healthcare regulations.
- **Strong partnerships**: Deep ties with Northwell Health (one of the largest health systems in the U.S.) provide real-world validation and data access [ascertain.com](https://www.ascertain.com/) [builtin.com](https://builtin.com/company/ascertain)

## Strategic Focus
- **Scale existing platform** across more health systems, specialty practices, and payers.
- **Expand automation** into denials management, population health, and care gap identification.
- **Deepen AI capabilities** while maintaining transparency and auditability.
- **Grow the team** (active hiring for product, engineering, and customer-facing roles) [linkedin.com](https://www.linkedin.com/company/ascertain-ai) [jobs.ashbyhq.com](https://jobs.ashbyhq.com/ascertain)

## Why Work Here
- **Mission-driven impact**: Work on reducing administrative burden that delays patient care; directly improve healthcare access and equity.
- **Culture**: “Clinicians, engineers, and business leaders” united by the belief that “less admin means better outcomes” [ascertain.com](https://www.ascertain.com/company)
- **Remote / Hybrid**: Some roles are remote (e.g., Brazil-based engineers), others are in-office or hybrid in New York. The company supports flexibility [builtin.com](https://builtin.com/company/ascertain) [linkedin.com](https://www.linkedin.com/company/ascertain-ai)
- **Engineering environment**: Apply cutting-edge AI (agents, LLMs, NLP) to real-world healthcare problems; work on a modern stack with fast iteration cycles.
- **Growth trajectory**: Rapidly growing startup (93% headcount growth YoY) with strong funding and strategic partnerships; opportunities for ownership and advancement.
- **Notable perks**: Not explicitly detailed, but typical for venture-backed AI startups (equity, competitive salary, mission-focused culture).

## Sources
1. [ascertain.com](https://www.ascertain.com/)
2. [ascertain.com/company](https://www.ascertain.com/company)
3. [ascertain.com/careers](https://www.ascertain.com/careers)
4. [linkedin.com/company/ascertain-ai](https://www.linkedin.com/company/ascertain-ai)
5. [builtin.com/company/ascertain](https://builtin.com/company/ascertain)

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- [Forward Deployed Engineer](https://feeny.ai/job/forward-deployed-engineer-ascertain-remote-rd1xdrv0j2nx)
- [Prior Authorization Assistant, Cardiology](https://feeny.ai/job/prior-authorization-assistant-cardiology-ascertain-remote-zhbcpz97d0wx)
- [Partner Operations Manager](https://feeny.ai/job/partner-operations-manager-ascertain-remote-ynnqc36wjtya)
- [Staff Product Manager, Automation](https://feeny.ai/job/staff-product-manager-automation-ascertain-new-york-k5dsyb5va4vd) — New York, NY
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