---
title: 'Senior Product Engineer (Europe) at Polar'
canonical: 'https://feeny.ai/job/senior-product-engineer-europe-polar-europe-h66y3mqrbhkd'
type: 'job'
last_seen: '2026-09-10'
---

# Senior Product Engineer (Europe) at Polar

- **Company:** Polar
- **Location:** Europe
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2025-06-17
- **Last confirmed live:** 2026-09-10
- **Apply:** https://jobs.gem.com/polar/am9icG9zdDpzKcc8t-KY2aAP96pbMHP_

## Job description

## 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 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.

## 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

- 5+ 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.
- Offer 🎉

## About Polar

## Company Overview
- **One-liner**: Polar is a Finnish pioneer in wearable sports and fitness technology, designing heart rate monitors, activity trackers, and bike computers that help people improve their fitness, performance, and health.
- **Entity Type**: Private (Privately Held)
- **Headquarters**: Kempele, Finland
- **Founded**: 1977
- **Founders**: Seppo Säynäjäkangas

## Core Business
- Primary industry: Wellness and Fitness Services; wearable technology
- Target customers: B2C (athletes, fitness enthusiasts, health-conscious consumers) and B2B (partnerships with research institutions and organizations)
- Mission: To help people all over the world improve their fitness, performance, and health through accurate measurement and data-driven insights

## Products & Services
- **Polar Heart Rate Monitors**: Chest straps and wrist-based optical HR sensors (e.g., Polar H10, Verity Sense) – known for medical-grade accuracy.
- **Polar Activity Trackers & Sports Watches**: Product lines such as Polar Vantage, Grit X, Ignite, and the newly launched Polar Street X (urban sports watch with GPS, AMOLED, LED flashlight) and Polar Loop (screen-free fitness band).
- **Polar Bike Computers**: Devices like Polar V650 for cycling navigation and performance tracking.
- **Polar Flow**: Free web and mobile app for tracking training, activity, sleep, and analyzing progress; integrates seamlessly with Polar devices.
- **Polar Research Center**: Innovation hub conducting R&D in sensor technology, algorithms, physiology, data science, and AI; collaborates with academic and industry partners globally.

## Market Standing
- **Valuation**: Not publicly available (private company)
- **Key Metric**: Over 600 patents registered since 1977; 17,500 studies published in Polar Research Library; millions of active monthly users.
- **Notable Investors/Partners**: Not disclosed (privately held; no recent funding rounds reported)
- **Growth Signals**: Active hiring for Senior AI/ML Engineer positions; headcount of 951 employees with +2.2% monthly growth (as of LinkedIn data); launch of new products (Street X, Loop) and ongoing expansion of data analytics and AI capabilities.

## Competitive Advantages
- **First-mover advantage**: Launched the world’s first wearable heart rate monitor in 1977 and has led the industry for over four decades.
- **Deep scientific foundation**: Extensive in-house research library with thousands of peer-reviewed studies, giving credibility and precision that competitors struggle to match.
- **Patent moat**: Hundreds of patents protecting sensor technology, algorithms, and guidance systems.
- **Integrated ecosystem**: Hardware + software (Polar Flow) with no hidden fees – free app for all users.

## Strategic Focus
- **AI/ML expansion**: Hiring Senior AI/ML Engineers to build production-grade machine learning systems for advanced analytics, time-series sensor data, and on-device intelligence (e.g., TensorFlow Lite, ONNX Runtime).
- **Wearable innovation**: Continuing to push boundaries in urban sports, screen-free fitness, and health monitoring.
- **Personalization**: Leveraging self-supervised learning, transformers, and generative AI to deliver deeper insights and guidance to users.

## Why Work Here
- **Impactful mission**: Directly improve the health and fitness of millions of users worldwide with scientifically backed technology.
- **Multidisciplinary culture**: Work alongside experts in sensor tech, AI, physiology, exercise science, firmware, and mobile – strong R&D focus with a dedicated Polar Research Center.
- **Work environment**: Offices in Finland (Kempele, Helsinki, Jyväskylä, Tampere). Preferred HQ location is Kempele; other locations negotiable. Remote/hybrid options not stated explicitly but likely flexible within Finland.
- **Unique perks**: Opportunity to work on on-device ML, embedded systems, and cutting-edge wearables; strong team spirit with a global company that has the agility of a private firm.
- **Growth opportunity**: Active job postings indicate investment in AI/ML and data analytics teams, offering career development in a maturing tech stack.

## Sources
1. [polar.com – About Us](https://www.polar.com/us-en/about_polar/who_we_are)
2. [polar.com – Careers (Senior AI/ML Engineer posting)](https://www.polar.com/us-en/careers/)
3. [LinkedIn – Polar Global Company Page](https://linkedin.com/company/polar-global)
4. [polar.com – Products](https://www.polar.com/us-en)
5. [polar.com – Jobs](https://www.polar.com/en/careers)

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