Staff Product Engineer (Europe)

Remote from: Europe
Annual salary: Undisclosed
Salary information is not provided for this position. Check our Salary Directory to estimate the average compensation for similar roles.
Department: Software Engineering
Employment type: Full Time,
Job posted: 16 Jun 2026
Apply before: 16 Jul 2026
Experience level: Senior
Views / Applies: 25 / 4

About company

About Polar

Polar is the financial layer for a new generation of intelligent software.

Computer Software
2023

Actively Hiring

AI Summary

Polar is building an open-source monetization platform for developers. As a Staff Product Engineer, you will work across the entire stack to ship features end-to-end, with high autonomy and no bureaucracy. You'll engage with the developer community and contribute to scaling infrastructure. The role is remote-first based in Europe and requires 8+ years of experience, a startup mindset, and expertise in modern web technologies.

Role DNA

Job Complexity

Easy Hard

Pace & Pressure

Relaxed Fast-paced

Autonomy Level

Guided Full Ownership

Communication Load

Independent Highly Collaborative

AI Insight The role demands 8+ years of experience, deep technical breadth across frontend, backend, and infrastructure, and the ability to autonomously ship high-quality software daily. This is a senior staff-level position with high expectations.

Salary Analysis

AI Insight The job listing does not specify salary, but for a Staff Product Engineer role in the US market, the typical range is $150,000 to $250,000, with a median around $200,000. The offered compensation is likely competitive, including equity and benefits, aligning with market rates for senior engineering talent.

Key Skills

React Next.js Python FastAPI PostgreSQL Redis Cloud Infrastructure DevOps Open Source Developer Experience

Cover Letter Sample

Dear Hiring Team,

I am excited to apply for the Staff Product Engineer position at Polar. With over 8 years of experience building and scaling high-quality software, I have a strong track record of owning features end-to-end and shipping rapidly. My background as a former startup CTO and contributor to open-source projects aligns perfectly with Polar's mission to empower developers.

I am particularly drawn to Polar's culture of autonomy and fast iteration, where engineers are trusted to deploy multiple times a day. My proficiency in React, Python, and cloud infrastructure, combined with a deep focus on developer experience, makes me confident in my ability to contribute to your platform from day one.

I look forward to the opportunity to help shape the future of software monetization. Thank you for your consideration.

Sincerely,
[Your Name]

Possible Interview Questions

Describe a time you shipped a complex feature end-to-end with high autonomy. How did you ensure quality and speed?

I once led the development of a real-time billing dashboard. I worked independently on the frontend and backend, using automated tests and monitoring to catch issues early. I deployed frequently, iterating based on user feedback, and delivered the feature two weeks ahead of schedule.

How do you approach designing for developer experience?

I put myself in the developer's shoes, minimizing friction and ensuring clear documentation. I focus on intuitive APIs, sensible defaults, and error messages that guide users. I also gather feedback from the community to continuously improve.

Explain how you would optimize a slow database query in our stack (Postgres).

I would start by identifying the slow query using EXPLAIN ANALYZE. Then, I would consider adding indexes, rewriting the query to reduce joins, or using caching with Redis. If necessary, I might denormalize data or partition the table.

Given Polar's remote-first culture, how do you collaborate effectively with a small team across time zones?

I prioritize asynchronous communication via written docs and clear updates. I use tools like Slack and Notion for transparency. I also ensure that I am available during core overlap hours for quick syncs, but I trust my teammates to manage their own time.

Walk me through your experience with cloud infrastructure and multi-cloud environments.

I have worked extensively with AWS and GCP, managing Kubernetes clusters, CI/CD pipelines, and monitoring. For multi-cloud, I have used Terraform for infrastructure as code and ensured redundancies across providers. I am comfortable with on-call and incident response.

About Polar

It’s never been easier to build, ship, and scale software. Yet, it’s never been harder to monetize software. It’s a bottleneck for the future.

We’re building the open-source monetization platform to empower future one-developer unicorns. Going beyond great billing primitives to offer a more comprehensive platform for the next generation of developers to scale global businesses around their software.

Today, Polar is used and loved by thousands of developers from 100+ countries, and growing quickly.

About the Role

We’re hiring an exceptional Staff 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.

What You’ll Do

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.
Contribute to scaling our infrastructure to handle growing traffic and complexity, including optimizing database queries and services for performance.
Continuously improve the quality of services and the overall developer experience.
Engage frequently with our developer community to identify pain points and solve them

About You

8+ years of experience building, shipping and scaling high-quality software.
You’re an ex-founder/startup CTO, open source maintainer or have side hustles
You ship fast and can solve any problem thrown at you
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.
Experience working with DevOps and comfortable maintaining, scaling and improving our infrastructure and participating in on-call
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) Experience working with payments, billing, or developer tools

Our Stack

Frontend: React & Next.js with Tailwind CSS, Shadcn, TanStack Router and more.
Backend: Python (FastAPI), Postgres, Redis, Dramatiq,
Cloud: Cloudflare, Render & AWS

We Offer

Competitive compensation & equity.
Remote-first & open source culture. Work from anywhere in Europe (CET ±2 hours) and contribute to Polar in the open
Generous workspace allowance. Budget for an initial home office setup or co-working membership
High ownership. Help shape our product, architecture, open source libraries, SDKs, and developer experience from the ground up
Twice-yearly team offsites. We gather in our teammates’ cities to experience their local life, brainstorm the future, and write pseudo-code for what delightful billing should look like
Fast-moving and pragmatic environment. A small, senior team focused on momentum over perfection. We cut scope before we cut craft to keep shipping fast and iterating often
Mission with leverage. Build tools that empower other builders; your work compounds through theirs

About the Team

We’ve written books on FastAPI, built Shop.app & Shop Pay, helped ship the Battlefield React UI, and contributed to (and maintained) a lot of open source. We’re ex-founders and open source maintainers who care deeply about craft, velocity, entrepreneurship, and developer experience.

How to Apply

Submit your application with a suggestion on how to improve Polar’s developer experience today – we’d love to hear your ideas.

Process

Our entire process is fully remote, and all communication happens via email, GitHub issues/PRs, and video calls. Here’s what to expect:

Application Review – We’ll review your application and may reach out for a 15–30 minute video call with Birk (Founder)

Team Interviews – You’ll meet a few team members for a deeper technical and cultural conversation

Open Source Assignment – We’ll follow up with a GitHub issue scoped within Polar or one of our open source dependencies. You’ll collaborate with us asynchronously—from your first PR draft to final merge

Final Call – A video chat to discuss your work, your feedback, and suggestions on how to improve the DX of working with Polar

Reference Calls. We believe reference calls are great and help us confirm our impression and ramp up our understanding and abilities to ensure we hit the ground running productively.