About this role.
Polar is hiring a senior full-stack product engineer to build and scale a monetization platform for software companies. The role spans frontend, backend, and infrastructure, using React, Next.js, Python/FastAPI, Postgres, Redis, cloud services, and related tooling. This Europe-remote position emphasizes rapid daily shipping, product judgment, developer experience, and independent end-to-end ownership. The engineer will collaborate on architecture and quality while engaging directly with the developer community to identify and solve problems. Candidates need at least seven years of experience and comfort operating in a lean, high-velocity startup environment.
Role DNA
A quick view of the complexity, pace, ownership and collaboration implied by the job description.
Job Complexity
5/5Pace & Pressure
5/5Autonomy Level
5/5Communication Load
4/5Salary analysis
Estimated compensation compared with the broader US market for similar roles.
Core skills
Skills and capabilities most closely associated with this opportunity.
Sample interview questions
I would explain the user problem, the success metric, and how I designed the architecture, implemented the interface and API or data model, provisioned deployment and observability, and iterated after launch using customer feedback and production data.
I keep changes small and reversible, use automated tests and typed interfaces for critical paths, add monitoring before or alongside release, and rely on feature flags or staged rollouts when risk is higher. I prioritize the safeguards that match the blast radius rather than adding process indiscriminately.
I would first define the pricing and entitlement model, event semantics, idempotency rules, and audit requirements. Then I would build a reliable usage-ingestion path, calculation and reconciliation workflows, clear customer-facing reporting, and monitoring for data correctness and payment failures.
I would identify a repeated source of friction through support requests, telemetry, or direct user conversations, then simplify the workflow through clearer APIs, documentation, defaults, or tooling. I would validate the result through reduced integration time, fewer support tickets, or improved adoption.
I clarify the irreversible decisions and expected near-term use cases, choose a simple design that supports likely extension, and document assumptions. I then ship a focused version, observe real usage, and deliberately revisit the design once evidence justifies additional complexity.
Why Polar?
It’s never been easier to build, ship and scale software.
But it’s never been harder to monetize it.
Modern startups look fundamentally different than prior generations:
Smaller teams
Exponential revenue growth relative to headcount
Higher variability in costs (LLMs) requiring more frequent pricing iterations
Laser focused on product development and distribution
Delegating and automating everything that is boilerplate – be it in their codebase or business operations.
Exceptional billing primitives, APIs and SDKs are essential, but delightful integration is not enough.
Startups need a billing platform designed for their speed of iteration. Combining billing and analytics in one platform to offer customer- and feature unit economics in real-time. Offering built-in pricing and cost insights, simulations and optimizations while simultaneously handling international compliance, tax management, fraud prevention and more.
That’s Polar. We’re building the next standard for applied AI startups.
Join our small, talented and engineering-led team across Europe as we build the infrastructure powering the next generation of software companies.
We focus on shipping at high velocity to serve startup founders scale their businesses. Everything else is secondary.
Product Engineering at Polar
Fullstack engineerings with a strong product sense and taste. As we grow, we’ll gradually move towards more specialized roles between backend vs. frontend vs. product engineering. Therefore, we ask about your main strength in the application to ensure we maintain a strong & balanced team across the spectrum.
Our Stack
Frontend: React & Next.js with Tailwind CSS, Shadcn, TanStack Router and more.
Backend: Python (FastAPI), Postgres, Redis, Dramatiq.
Cloud: Vercel, Render & AWS.
Always subject to change as we scale and new technologies emerge.
Role & responsibilities
We’re hiring exceptional Senior Product Engineers to join our growing remote-first team in Europe. You’ll work across our entire stack to ship innovative features, enhancements and delights; obsessing over the developer experience and empowering them to scale their businesses. You’re very comfortable jumping between frontend, backend, and infrastructure to autonomously identify, build, ship and scale features.
We don’t have a lot of meetings, red tape or code reviews. We celebrate and optimize our organisation for shipping high-quality software fast – each engineer deploys countless times a day. So you’ll be given a lot of agency and autonomy to move fast towards our mission and serving our developer community.
Ship daily towards building the best monetization platform for developers in the world.
Design, build, and ship features, enhancements and delights end-to-end – jumping between frontend, backend, and infrastructure.
Collaborate with the team on architecture design, best practices, and ensuring high-quality code across our stack.
Continuously improve the quality of services and the overall developer experience.
Engage frequently with our developer community to identify pain points and solve them.
What we’re looking for
7+ years of experience building, shipping and scaling high-quality software.
You ship fast and can solve any problem thrown at you end-to-end.
Strong proficiency with our stack or a variety of similar programming languages and ability + desire to quickly learn and pickup new tools.
Strong problem-solving abilities with an eye for developer experience.
Experience with cloud infrastructure and multi-cloud environments.
Excellent collaboration skills – comfortable working closely with a small, high-performing team. It’s a startup so we all have to lean-in across the board to.
You care deeply about your craft – be it delightful animations, thoughtful edge-case handling, developer experience or performance optimizations.
(Bonus) You’re an ex-founder/startup CTO, open source maintainer or indie hacker.
(Bonus) Experience working with payments, billing, or developer tools.
What we offer
Meaningful ownership: Small team & large surface area. You’ll directly influence how the company and platform scale.
Product-driven culture: We build to empower the next generation of software companies – and operate with the same builder mindset internally.
Competitive compensation: Salary and equity aligned with the impact of the role.
Exceptional team: Work with highly talented team members distributed across Europe.
Remote-first environment: Work from anywhere in Europe, with a home office setup budget available.
Annual team offsites: As the team is spread across Europe, we gather in person at least once a year to collaborate, plan, and spend time.
Health Benefits: Comprehensive health coverage to support you and your family.
Parental leave: Paid parental leave aligned with the standards and regulations of your local jurisdiction.
How We Hire
Polar is a remote-first company, with team members across Europe, and our hiring process is fully remote via video calls and email.
Hiring Process
Application Review: We review your application and previous work.
Intro call: A short conversation with Birk (Founder and CEO) to learn more about you and give you a chance to learn more about Polar.
Take-home Assignment: A practical exercise designed to reflect the kind of problems you would work on in the role.
Assignment Review: We review your assignment and feedback together
Team Conversations: 2-3 video calls where you get the chance to meet future team members.
Offer 🎉
Reference Calls
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