Senior Full Stack Engineer

Ersilia; San Francisco (CA); On-site; USD 160,000 - 230,000; Full time

Job summary

Ersilia in San Francisco seeks a Senior Full Stack Engineer to own and build net-new product areas at a high-growth AI startup transforming insurance operations. You will join a 15-person team and build from scratch 80% of the time, driving a new browser automation and document intelligence platform.

You’ll ship features quickly on a modern TS/React/Node.js stack, collaborate cross-functionally, and demo to customers. 4–8 years of experience required; on-site in SF.

Qualifications

• 4-8 years of experience in full-stack engineering, shipping customer-facing products end-to-end
• Proficiency in modern stack: TypeScript/React/Node.js
• Experience deploying AI/LLM-based solutions is a plus
• Strong academic performance encouraged (GPA 3.7+); IIT/JEE ranking positive signal

Responsibilities

• Own and build conversational, real-time AI agents for insurance operations, end-to-end
• Ship net-new features rapidly (first PR to production in week one) across a modern TS/React/Node.js stack
• Work cross-functionally with product and forward-deployed engineering teams, and demo features to customers
• Shape technical decisions on architecture, tooling, and infrastructure as an early engineer
• Mentor newer engineers and help establish engineering best practices as the team grows

Skills

TypeScript/React/Node.js

Education

GPA 3.7+ preferred

IIT/JEE ranking

Job description

Job Description

Senior Full Stack Engineer

Salary:$160K - $230K

Equity:0.2-0.6%

On-site work policy:5 days in-office

Visa Sponsorship Details:Open to visa transfers(e.g. OPT, H1B transfers)

Hiring Count:Looking to hire1 - 2candidatesfor this role

Location:San Francisco, California, United States

About this role

We are looking for a Senior Full Stack Engineer with 4-8 years of experience to own and build net-new product areas at a high-growth AI startup transforming insurance operations. You'll join a 15-person team (10 in eng/prod) that's grown from $0 to $3M in revenue in just 15 months, building AI agents that handle complex insurance workflows across voice, chat, email, and SMS. This is a high-ownership role where you'll be building from scratch 80% of the time, specifically driving the company's new browser automation and document intelligence platform. You'll report directly to the CEO and work alongside a tight-knit, ambitious team in San Francisco.

Will you be doing?

• Own and build conversational, real-time AI agents for insurance operations, end-to-end


• Ship net-new features rapidly (first PR to production in week one) across a modern TypeScript/React/Node.js stack


• Work cross-functionally with product and forward-deployed engineering teams, and selectively join customer meetings to demo features you've built


• Shape technical decisions on architecture, tooling, and infrastructure as an early engineer at a company scaling fast


• Help establish engineering best practices and mentor newer engineers as the team grows toward 30 people by year-end

Why candidates should join

1. We build AI agents that handle complex insurance operations — from claims intake to policy servicing — across voice, chat, email, and SMS for carriers representing $10B+ in annual premiums.


2. Y Combinator-backed, $0 to $3M revenue in 15 months, team of 15 with plans to hit 30 by year-end. You'd be joining at the perfect inflection point before a Series A raise.


3. Senior Full Stack Engineer role with $160K–$230K base + 0.2%–0.6% equity. On-site in SF, owning net-new product areas end-to-end.

Role Requirements

Seniority

1. Requirement: 4 - 8 years of experience in full- stack engineering, shipping customer- facing products end- to- end

Requirement: 4 - 8 years of experience in full- stack engineering, shipping customer- facing products end- to- end

Requirement: Senior Software Engineer or Software Engineer approaching end of mid- career, already performing at a senior level and looking for more end- to- end ownership

Nice to have: Experience deploying LLM- based/agentic solutions in production

Nice to have: Big tech to YC startup (Seed to Series A) pipeline

Education

1. Requirement: Strong academic performance(GPA 3. 7+ preferred; IIT/JEE ranking is a strong positive signal)

Hard skills

1. Must have: Proficiency in a modern languagewith willingness to work in TypeScript/React/Node. js

Soft skills

Nice to have: Customer- facing comfort; willing to demo and join client calls

Miscellaneous

Must have: Must work on- site in San Francisco 5 days/week

Must have:Beenpromoted multiple times at previous companyand looking for new challenge