Y Combinator Junior Software Engineer · Null Labs · Remote (US) or Orlando, FL · $45K-$100K + equity
Posted Updated 8
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Summary
Junior software engineer joining a small startup to build Argus, a fintech product that audits retail suppliers' payment deductions and automates disputes. Day to day: writing Python data pipelines, scrapers and portal automation, Postgres work, tests, and dashboard features, deployed via Docker on AWS.
Compensation: $45k – $100k • 0.1% – 1.0%
What Null Labs is
- We build Argus: software that recovers money retail suppliers lose to deductions, fines, and underpayments
- Suppliers to major US retailers get money taken off their payment checks across six portals with no APIs; most never fight it
- Argus logs in, audits every payment, classifies every deduction, matches it to invoices and shipping docs, and builds the dispute
- Deductions are feature one; the end goal is the supplier's entire retailer relationship running through one system
Who we need
- A junior engineer who ships
- 1-3 years of professional experience, or a portfolio of shipped projects that proves the equivalent
- Strong Python: you can build a data pipeline, an API integration, or a scraper from scratch and it holds up
- Solid SQL and comfort with Postgres: schemas, joins, migrations, not just SELECT statements
- Hands-on with at least one of: browser automation (Playwright/Puppeteer), ETL/data pipelines, or LLM agent workflows
- Experience writing tests (pytest) and working with Git/PRs on a shared codebase
- Comfortable with Docker and basic cloud deployment (AWS)
- Uses AI coding tools daily as a power user, not a tourist
- Honest about what you don't know: asks instead of assuming, flags uncertainty instead of guessing
- Works directly with our CTO and first engineer, so you learn fast and your work gets reviewed daily
What you'll be doing
- Building Argus end to end
- Parsers that turn messy portal data into clean structured records
- Automation that operates inside authenticated enterprise portals
- Pieces of the dashboard our client checks daily
- Tests, the data quarantine queue, and fixing what breaks
- Your code touches a paying client's real money in your first two weeks
$45K-$100K depending on experience and location, plus equity Salary ramps as our round closes this fall
To apply
Send your GitHub and one thing you built that works, with a note on what broke while building it No GitHub, no interview
