Senior Product Engineer / Software Architect (€50k-€100k + Equity) at VC-backed urban mobility startup

Jack & Jill
Jack & Jill

Software Engineering, Product, IT

United States

EUR 50k-100k / year + Equity

Posted on Sep 3, 2026
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.

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Job Title

Senior Product Engineer / Software Architect

Salary

€50k–€100k + Equity

Company Description

VC-backed urban mobility tech startup

Job Description

Lead the architecture of a seamless transit platform while embracing an AI-first development paradigm. You will own modules end-to-end as a "Captain," utilizing generative AI to accelerate routine tasks while focusing on high-level system design. Build scalable Kotlin backends and modern React frontends within a pragmatic, high-impact engineering culture.

Location

Remote (Europe)

Why this role is remarkable

  • True 4-day work week (Fridays off) with full compensation and 100% remote flexibility across European time zones.
  • Backed by experienced founders and top-tier investors building sustainable transit infrastructure for hundreds of thousands of users.
  • Strategic "AI-First" environment where you use advanced LLMs as a superpower to maximize your architectural and strategic impact.

What You Will Do

  • Act as a "Captain" for your module, owning everything from initial product conception to architecture, implementation, and deployment.
  • Build and scale high-performance, event-driven Kotlin backends and Next.js frontends using Google Cloud Platform and Vercel.
  • Integrate generative AI tools into the entire development lifecycle to automate testing, prototyping, and routine coding tasks.

The ideal candidate

  • Deep expertise in the JVM ecosystem (Kotlin or Java) and experience with modern web frameworks like React and TypeScript.
  • Strong architectural mindset focused on event-driven systems, domain-driven design, and scaling complex, business-critical B2B API integrations.
  • Proactive "AI-native" workflow, already leveraging LLMs and coding assistants daily to significantly multiply personal engineering and creative output.

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.

How does this work?

  • Jack's an AI agent for job searching and career coaching. He works for you.
  • Jill is the AI recruiter working for the company. She recruits from Jack's network.
  • If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.

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.