Founding Full-Stack Engineer - Fintech Platform (Hybrid NYC)

LendKoi, Inc.; New York (NY); Hybrid; USD 150,000 - 210,000; Full time

Benefits offered by this job

Equity

Hybrid work (New York City)

Job summary

LendKoi, Inc. is looking for a Founding Full Stack Engineer in New York City with a hybrid work model to build our lending platform end-to-end—from borrower web app to the Django API and fintech integrations.

You will own features across both frontend and backend, focusing on testing, observability, performance, and security in a regulated fintech domain. You will work with leaders and partners to raise the engineering bar, design scalable solutions, and shape product architecture as the team

Qualifications

• Strong TS/React (Next.js App Router a plus) and Python/Django (DRF).
• Experience with PostgreSQL data modeling and Celery-based async patterns.
• Production familiarity with AWS Beanstalk/EC2, RDS, SQS.
• Proficient with Git, CI/CD pipelines, and automated deployment.
• Testing discipline with Vitest, Testing Library, Playwright, or pytest.
• Familiar with AI coding tools and data-privacy guardrails.
• Clear documentation and scalable, well-structured code.
• Care about correctness in money movement and fintech.
• Founding-engineer mindset: end-to-end ownership, self-starter.
• New York City hybrid work; background check and references.

Responsibilities

• Full-stack feature delivery across borrower app and Django API.
• Fintech integration work: new vendor APIs, webhooks, retries, and workflows.
• Infrastructure evolution and scaling.
• Raising the engineering bar: testing, observability, performance, and security.

Skills

TypeScript

React

Next.js

Python

Django

PostgreSQL

Celery

AWS

Git

CI/CD

Testing (Vitest/Playwright/pytest)

OpenAPI / API clients

AI coding tools

Documentation

Education

CS degree or equivalent hands-on experience

Tools

Django REST Framework

OpenAPI

AWS Beanstalk

EC2

RDS

SQS

GitHub Actions

Typed API clients

Job description

LendKoi, Inc. is looking for a Founding Full Stack Engineer in New York City with a hybrid work model to build our lending platform end-to-end—from borrower web app to the Django API and fintech integrations.

You will own features across both frontend and backend, focusing on testing, observability, performance, and security in a regulated fintech domain. You will work with leaders and partners to raise the engineering bar, design scalable solutions, and shape product architecture as the team