Note: The job is a remote job and is open to candidates in USA. LendKoi is a financial technology company that provides credit and a digital financial suite for immigrants and US citizens new to credit. The Lead Full Stack Engineer will build and deliver features across the borrower-facing web app, Django API, and fintech integrations while helping set technical direction. The role also involves owning production problems, mentoring engineers, and improving testing, observability, performance, security, and infrastructure as the company scales.
Responsibilities
- Hands-on, full-stack feature delivery across the borrower app and the Django API - most features span both
- Fintech integration work: new vendor APIs, reliable webhook handling, retry and reconciliation semantics, and payment and loan-servicing workflows
- Infrastructure evolution - growing with scale
- Raising the engineering bar: testing strategy, observability, performance, and security in a regulated lending domain
Skills
- • 5+ years of hands-on experience building and deploying applications in production, including technical leadership
- • Technical experience as a lead engineer, VP of Engineering, Head of Engineering, senior staff engineer, CTO, or similar
- • Strong TypeScript/React (Next.js App Router experience a plus) and strong Python/Django (including Django REST Framework) - this is a genuinely full-stack role
- • Comfortable with PostgreSQL data modeling, Celery/queue-based async patterns, and third-party API integration at production quality (idempotency, retries, webhooks)
- • Working AWS knowledge (Beanstalk/EC2, RDS, SQS) - enough to own deploys and debug production
- • Strong familiarity with Git, CI/CD pipelines, and automated deployment
- • A testing habit - you write tests without being asked (Vitest / Testing Library, Playwright, pytest)
- • Strong command of AI coding tools, with disciplined verification and data-privacy guardrails
- • Excellent documentation skills and a commitment to organized, understandable code that scales as the team grows
- • Care about correctness with money movement
- • Curiosity about fintech and empathy for users - you're passionate about building technology that solves real-world financial challenges
- • Founding-engineer temperament: owns problems end-to-end, pragmatic about scope, comfortable with ambiguity and vendor quirks; a self-starter who builds without constant oversight
- • Must be based in the United States
- • Fintech or lending experience - a plus, not a requirement
- • Experience with schema-first / OpenAPI-driven development and typed API clients
- • Experience with payment processing, loan origination, or loan servicing systems
- • Zero-downtime migration discipline and on-call / runbook experience
- • Familiarity with MLOps, ML engineering, or supporting the AI/data-science model lifecycle
- • Understanding of data structures and distributed systems for large-scale data processing
Benefits
- Equity
- Flexible New York City remote/hybrid
- Full-time employment
- Mission-driven work focused on providing fair and accessible credit and unlocking opportunities for underbanked communities
- High-impact role shaping how thousands first experience and understand the company
- Creative freedom to test ideas, iterate quickly, and bring personality to fintech
- Small, fast team with plenty of ownership and close collaboration with the executive team
- Opportunities to learn from incredibly talented leaders and genuinely good people
- Paid, full-time, flexible remote/hybrid role
Company Overview