Senior Software Engineer

Why Shuttlebase?

Every day, millions of people decide whether to buy something online, and the reasons behind those decisions are still mostly guesswork. We want to change that.

We're working to quantify human psychology: to build an embedding model for human behavior that understands how people react to a page, a price, or a single sentence, and can predict what will work before anyone runs a test.

Every experiment our AI runs on a live store teaches that model something about how people decide. Our goal is for any company to be able to ask, "I'm selling product X to audience Y, how do I optimize for Z?" and get an answer it can trust.

We're early and well funded. The people who join now will pick the tools, design the models, and help choose who joins next. If that's a problem you want to spend the next few years on, we'd like to meet you.

Senior Fullstack Engineer

Tens of millions of shopper events flow through our systems every day, and every experiment our AI runs adds another piece of evidence about why people buy. You'll build the systems that capture that evidence, turn it into something a model can learn from, and put the model's ideas in front of real shoppers without breaking anything. It's hands-on work across the whole stack, on a small team where you'll design most of what you build.

What you'll work on

• The data behind the model. Our pipeline (AWS, ClickHouse) takes in tens of millions of web events a day. You'll make it faster and more reliable, and shape it into data a behavior model can learn from.

• The model itself. You'll help decide how we represent shoppers, pages, and changes so the model can tell what will work before we test it.

• From idea to live test. When the AI proposes a change, your code turns it into a working version of the page, checks that it doesn't break checkout or tracking, and serves it to real shoppers.

• What clients see. The dashboard where clients review what the AI wants to try, approve it, and follow the results.

We mostly work in Python on serverless AWS, JavaScript on the frontend, and Postgres alongside ClickHouse.

You'll love this job if

• You want to work on an open research problem and still ship to production every week.

• You like moving across the stack, from a ClickHouse query to a dashboard screen, in the same week.

• You'd rather put a rough version in front of real data in three days than polish a design for a month.

• You get excited when a result surprises you and you have to figure out why.

What you bring

• 5+ years of experience

• You've built and run production systems end to end, and you've fixed them when they broke. We mostly use Python and JavaScript, and you can pick up whichever one you know less.

• You've worked with data at scale: event pipelines, streaming, or analytics databases.

• You've led a major project or a small team, from the design decisions to the launch.

• You've built with LLMs or other ML models, and you know where they fail.

• Bonus: you've trained or deployed ML models in production, or you've built a product from zero at a startup.

What We Value

• Curiosity and excellence: We're trying to understand why people decide what they do, so asking questions is the job. We push on each other's ideas, and a failed experiment teaches us as much as a winning one.

• Whatever it takes: If something needs doing, whoever can do it does it, whatever their title. Our clients' results are our results.

• Ownership: Shipping something is where the work starts. You follow it all the way to the result, and when you get something wrong, you say so and fix it. We keep our promises, the big ones and the small ones.

• Agility: Most ideas go from whiteboard to working prototype in two or three days. If something isn't working, we drop it fast, and nobody holds it against you.

• Enjoy the ride: Building something new comes with rough weeks. We get through them together and celebrate the good ones.

What We Offer

• Competitive compensation

• Meaningful equity - real ownership in Shuttlebase’s success.

• Medical, dental, and vision coverage for you and your family.

• Unlimited PTO - we trust you to take the time you need.

• Tax free commuter and parking benefits

• Office-first culture (4 days/week) - Midtown Manhattan, in the middle of it all.

• Work directly with the founding team - your impact is immediate, visible, and career-defining.

• Free One Medical Membership

• 401k