Founding Engineer - Backend & Data Platform ($175k-$225k + Equity) at Fintech startup trusted by Goldman Sachs and JPMorgan

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Founding Engineer - Backend & Data Platform Salary $175,000 - $225,000 + Equity Company Description Fintech startup automating mortgage lending for self-employed borrowers, backed by industry leaders and trusted by Goldman Sachs, JPMorgan, and Morgan Stanley. Job Description As the founding backend and data platform engineer, you will architect the infrastructure that powers non-traditional mortgage lending. You'll own the end-to-end data lifecycle—from ingesting banking and tax data via Plaid and Finicity to building canonical models and ML-ready pipelines. This high-agency role involves shaping the core product used by major global financial aggregators. Location San Francisco, Austin, NYC, Remote Why this role is remarkable

• Significant architectural influence as a founding team member, building greenfield infrastructure for a product already trusted by Goldman Sachs, JPM, and Morgan Stanley.
• High-agency environment led by a team from Airtable and Opendoor, operating with a flat structure where engineers participate in the entire product lifecycle.
• Aggressive equity upside in a fintech solving a massive market gap for 76 million self-employed Americans who are currently underserved by traditional lenders.

What You Will Do

• Design and operate resilient data ingestion and normalization pipelines for complex financial sources including banking, tax transcripts, and accounting platforms.
• Build core platform infrastructure including authentication, webhooks, rate limiting, and vendor-agnostic abstraction layers to ensure system reliability and scalability.
• Develop in-house feature extraction pipelines and productionize ML models for income categorization, anomaly detection, and automated financial insights.

The ideal candidate

• Senior or Staff-level engineer with deep experience building data-centric products from infancy, specifically involving complex Postgres schema design and SQL migrations.
• Practical experience consuming ML models via APIs/SDKs and building the supporting feature pipelines, though this is an engineering rather than research-focused role.
• Proficient in TypeScript and modern backend architectures, with a strong bias toward shipping and experience working in fast-paced, early-stage startup environments.

Who are Jack & Jill? Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support. And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate. Next steps Step 1. Visit the job listing. Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/founding-engineer-backend-and-data-platform-175k-225k-equity-at-fintech-startup--039cba14-9ae1-41eb-863b-857fbca3a395?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_039cba14-9ae1-41eb-863b-857fbca3a395 Step 3. Talk to Jack so he can understand your experience and ambitions. Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. Step 6. If not, Jack will find you excellent alternatives. All for free. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.