Application Guide

How to Apply for Senior Firmware Engineer

at Lime

🏢 About Lime

Lime is a leader in micromobility, offering shared electric scooters and bikes in cities worldwide to reduce car dependency and carbon emissions. Working here means contributing to sustainable urban transportation with a global impact, backed by a strong engineering culture that values innovation and rapid iteration.

About This Role

As a Senior Firmware Engineer, you'll architect and develop the embedded software powering Lime's vehicle fleet, including next-gen unreleased products. Your work directly affects vehicle safety, performance, and user experience, collaborating with hardware teams to bring robust, real-time systems to life.

💡 A Day in the Life

Start your day with a stand-up meeting with your distributed team in Canada and the US, then dive into coding a new motor control algorithm in C++. After lunch, you might debug a device driver issue on a test bench, then review a hardware design proposal for the next-gen scooter. The afternoon includes a design review for a new OTA update protocol, followed by testing your firmware on a prototype vehicle.

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Interview Prep

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🎯 Who Lime Is Looking For

  • Experienced in embedded C/C++ with 5+ years in consumer electronics, automotive, or similar fields, with hands-on board bring-up and device driver development.
  • Proficient in embedded Linux and RTOS environments, including multicore system design and debugging.
  • Comfortable working across the full stack—from hardware interfaces to application logic—and owning features end-to-end.
  • A collaborative problem-solver who thrives in a fast-paced, globally distributed team and is passionate about sustainable mobility.

📝 Tips for Applying to Lime

1

Highlight any experience with battery management systems, motor control, or IoT connectivity, as these are core to Lime's vehicles.

2

Mention specific projects where you optimized firmware for power efficiency or real-time performance, given the constraints of battery-powered devices.

3

If you've worked with Rust in embedded contexts, emphasize it—Lime's JD lists Rust as a key language alongside C/C++.

4

Tailor your resume to show remote collaboration experience, especially with cross-timezone teams, as this role is remote in Canada.

5

Include metrics or outcomes from your firmware work (e.g., reduced boot time by 30%, improved OTA update success rate).

✉️ What to Emphasize in Your Cover Letter

["Your passion for sustainable transportation and how your skills can directly improve Lime's vehicle reliability and safety.", "Specific examples of embedded systems you've designed from concept to production, especially in safety-critical or battery-powered contexts.", "Your experience with Linux device drivers and RTOS, and how you've handled real-time constraints.", 'Ability to work autonomously in a remote environment while collaborating effectively with hardware and software teams.']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read Lime's engineering blog (if available) or recent press releases about their vehicle technology and sustainability goals.
  • → Understand Lime's vehicle models (e.g., Lime-S, Lime-E) and their key firmware challenges like battery management and motor control.
  • → Familiarize yourself with Lime's approach to OTA updates and fleet management, as this is a critical firmware responsibility.
  • → Check Lime's values and diversity initiatives to see how your background aligns with their culture.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Describe a time you debugged a tricky firmware issue involving hardware-software interaction (e.g., I2C/SPI communication failure).
2 How would you design a firmware update mechanism for a fleet of thousands of scooters with limited connectivity?
3 Explain your approach to power management in an RTOS-based embedded system.
4 Walk through your experience with multicore processors: how did you handle synchronization and resource sharing?
5 How do you ensure firmware reliability in the face of harsh environmental conditions (e.g., vibration, temperature extremes)?
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⚠️ Common Mistakes to Avoid

  • Don't submit a generic resume—ensure it clearly shows embedded systems focus, not general software engineering.
  • Avoid downplaying hardware knowledge; Lime emphasizes close collaboration with hardware teams, so show comfort with schematics and datasheets.
  • Don't neglect to mention remote work experience or self-discipline; the role is remote, and they'll look for evidence of effective remote collaboration.

📅 Application Timeline

This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.

Typical hiring timeline:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to Lime!

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