Principal Software Engineer ($190,000-$240,000 + Equity) at $145M+ Series B embedded finance platform

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

Principal Software Engineer

Salary

$190,000-$240,000 + Equity

Company Description

$145M+ Series B embedded finance and card issuance platform backed by Oak HC/FT and Costanoa Ventures

Job Description

Join a high-velocity team founded by former Braintree and PayPal leaders to revolutionize modern card platform management. As a Principal Engineer, you will architect secure, scalable Java-based payment systems, integrate advanced AI-powered development tools into the SDLC, and build critical ledger and wallet functionalities for digital-first organizations globally.

Location

San Francisco, USA

Why this role is remarkable

• Build from the ground up at a flat organization where you have direct exposure to a leadership team comprised of payments industry veterans from PayPal and Lending Club.
• Influence the future of embedded finance with a company that has raised over $145M from top-tier investors like Westcap and Pinegrove Venture Partners.
• Work in a hybrid San Francisco environment that prioritizes face-to-face connection while providing a generous home office stipend and 100% healthcare coverage.

What You Will Do

• Architect and write high-quality, robustly tested Java code to build secure card issuer processor products and ledger functionalities.
• Lead the adoption of AI-powered development tools like Claude Code to accelerate design, prototyping, and the full software development lifecycle.
• Interface across multiple company domains to document and strengthen a rapidly-scaling platform that solves complex, real-world payment use cases.

The ideal candidate

• 12+ years of experience building production software systems with a mastery of scalable, performant, and maintainable backend engineering.
• Deep proficiency in Java (11+), JPA/ORM mapping, and SQL, with a strong interest in learning and implementing AI agent frameworks.
• Demonstrated passion for shipping customer-centric software and a drive to push the boundaries of engineering productivity using modern AI tools.

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/principal-software-engineer-190-000-240-000-equity-at-145m-series-b-embedded-fin-ce59a637-fca9-40f1-91d3-bc02ba46bc7c?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_ce59a637-fca9-40f1-91d3-bc02ba46bc7c

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.