Application Guide

How to Apply for Senior Security Engineer

at Lime

🏢 About Lime

Lime is a leading micromobility company that operates shared electric scooters and bikes in over 200 cities globally, with a mission to build a future where transportation is shared, affordable, and carbon-free. Working at Lime means contributing to sustainability while tackling complex engineering challenges in a fast-paced, remote-first environment.

About This Role

As a Senior Security Engineer, you'll embed security into Lime's software development lifecycle, partnering with product and engineering teams to secure APIs, mobile apps, and cloud infrastructure. Your work directly protects millions of riders and supports Lime's growth by enabling safe and scalable innovation.

💡 A Day in the Life

You might start the day reviewing a threat model for a new feature from the product team, then join a standup to discuss security findings from the latest bug bounty submissions. After lunch, you could be writing a custom security scanner to detect misconfigurations in AWS, followed by a 1:1 mentoring a junior engineer on secure API design. The day ends with triaging vulnerability reports and updating the team's security roadmap.

🚀 Application Tools

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Interview Prep

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🎯 Who Lime Is Looking For

  • Has 5+ years of product/application security experience with deep expertise in mobile (iOS/Android) and API security, plus hands-on cloud security in AWS or GCP.
  • Thrives in a lean, remote-first environment and can independently drive security initiatives like threat modeling, bug bounty programs, and security tooling.
  • Possesses strong communication skills to mentor engineers and advocate for security-by-default practices across cross-functional teams.
  • Is comfortable with detection engineering, vulnerability management, and automating security testing (SAST/DAST/SCA) in CI/CD pipelines.

📝 Tips for Applying to Lime

1

Tailor your resume to highlight specific mobile security (iOS/Android) projects and API security reviews, as these are core to the role.

2

In your cover letter, mention your experience with bug bounty programs and how you've improved vulnerability management in past roles.

3

Showcase any work you've done with cloud security on AWS/GCP, especially securing microservices or serverless architectures.

4

Prepare a portfolio or examples of security tools you've built or automated (e.g., custom scanners, CI/CD integrations) to demonstrate your impact.

5

Since Lime is remote-first, emphasize your ability to work asynchronously, communicate clearly in writing, and collaborate across time zones.

✉️ What to Emphasize in Your Cover Letter

["Highlight your experience with mobile security and API threat modeling, directly aligning with Lime's product stack.", 'Emphasize your ability to work autonomously in a remote, lean team and drive security initiatives without heavy oversight.', "Show passion for sustainability and micromobility, connecting your security work to Lime's mission of reducing carbon emissions.", "Mention specific tools or frameworks you've used for SAST/DAST/SCA and how you've integrated them into CI/CD to reduce vulnerabilities."]

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read Lime's engineering blog or tech talks to understand their stack and security challenges.
  • → Familiarize yourself with Lime's bug bounty program on HackerOne or Bugcrowd, if public.
  • → Research Lime's recent security incidents or public disclosures to understand their threat landscape.
  • → Learn about Lime's remote culture and values from their careers page or employee reviews on Glassdoor.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Walk me through how you would perform a threat model for a new scooter-sharing API endpoint.
2 Describe a time you automated a security testing pipeline; what tools did you use and what was the outcome?
3 How would you handle a critical vulnerability found in a third-party dependency in production?
4 Explain your approach to mentoring junior engineers on secure coding practices in a remote setting.
5 What's your experience with bug bounty programs? How would you improve Lime's program?
Practice Interview Questions →

⚠️ Common Mistakes to Avoid

  • Don't focus only on network security or infrastructure security; this role is product-focused (apps, APIs, cloud).
  • Avoid generic statements like 'I love security' without backing them up with specific mobile/API examples.
  • Don't overlook the remote aspect; failing to demonstrate remote collaboration skills can hurt your application.

📅 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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