Senior Software Engineer (Full Stack)

Ersilia; New York (NY); Hybrid; USD 180,000 - 220,000; Full time

Benefits offered by this job

Competitive equity

Job summary

Ersilia, a fast-growing AI healthcare startup in New York City, seeks a Senior Full Stack Engineer with 3+ years of experience to own greenfield projects across the entire stack. You will build greenfield products that automate healthcare recruiting and scale from thousands to millions of interactions, working closely with the founding team.

You will ship key features in a TypeScript-first, serverless AWS environment, collaborating with leadership and contributing to engineering standards in a

Qualifications

• Must have: 3+ years of experience in full-stack software engineering.
• Strong foundation in Python.
• Proficient in TypeScript end-to-end (frontend, backend, infra).
• Experience building and scaling distributed systems in production.

Responsibilities

• Own and deliver greenfield projects across the full stack (backend, infrastructure, and frontend).
• Evolve and scale the backend architecture as the platform grows.
• Build and ship end-to-end features in a TypeScript-first environment on serverless AWS infrastructure.
• Collaborate with the Director of Engineering and founding team with short feedback loops and high autonomy.

Skills

Python

TypeScript

Distributed systems

Observability/monitoring

Frontend development

Education

BS in Computer Science or Computer Engineering

Tools

AWS

Serverless architectures

Job description

Job Description

Senior Software Engineer (Full Stack)

Salary

$180K - $220K

Equity

Competitive equity

Hybrid work policy

4 days in-office in Midtown, New York City (Mon-Thu)

Visa Sponsorship Details

Open to visa transfers(e.g. OPT, H1B transfers)

Hiring Count

Looking to hire2candidatesfor this role

Location

New York City, NY

About this role

We are looking for a Senior Full Stack Engineer with 3-5+ years of experience to join a fast-growing AI healthcare startup and own projects that span the entire stack. You'll be building greenfield products that automate the healthcare recruiting pipeline — from sourcing to onboarding — at a company that’s already powering thousands of candidate interactions monthly and scaling to millions. You should have experience at both an early-stage VC-backed startup and a larger tech company, bringing best practices without being rigid. This is a high-ownership role where you’ll work closely with the founding team, ship quickly, and see your work in production with real feedback loops the next day.

What will you be doing?

• Own and deliver greenfield projects across the full stack (backend, infrastructure, and frontend) powering Take2's new product suite

• Evolve and scale the backend architecture as the platform grows from thousands to millions of candidate interactions

• Build and ship end-to-end features in a TypeScript-first environment on serverless AWS infrastructure

• Collaborate directly with the Director of Engineering and founding team with extremely short feedback loops and high autonomy

• Help establish engineering standards and technical culture as a key early member of an 11-person team

Why candidates should join

• We build AI agents that automate the entire healthcare recruiting pipeline — from screening interviews to license verifications to job offers. They already power thousands of candidate conversations monthly and are scaling to millions.

• Backed by Human Capital (a $3B fund behind SpaceX) with a $19M Series A raised in under a month. Zero to $4M revenue in 8 months and on track for a Series B by year-end. Board advisors include ex-CHROs of Google, HP, Visa, and Disney.

• Senior full-stack (backend-leaning) role with significant greenfield ownership. $180K-220K base + competitive equity. Hybrid in NYC (Mon-Thu) with a tight 3-round interview process.

Requirements

Role Requirement

Seniority

• Required: 3+ years of experience in full- stack software engineering, strong foundation in Python

Work experience

• Must have: Building and scaling high- throughput and distributed systems (observability/monitoring and reliability for mission- critical systems)

• Required: 2+ years at an early- stage, VC- backed startup

• Nice to have: Experience at a big tech company or tier- one startup (e. g. , Ramp, Stripe)

Education

• Required: BS in Computer Science or Computer Engineering

Hard skills

• Must have: Proficient in TypeScript end- to- end (frontend, backend, and infra)

• Required: Experience building and scaling distributed systems in production

• Nice to have: Built or deployed AI applications (LLMs, ML pipelines) in production

Soft skills

• Must have: Mission- driven; eager to build from scratch

• Must have: Low ego; changes mind quickly when presented with better arguments

Miscellaneous

• Must have: Based in NYC; able to work in- office Mon-Thu