Senior Hardware Security Engineer, Lime
Salary not provided
Senior and Expert level
Remote from UK
Electric bike and scooter rentals
Be an early applicant
Electric bike and scooter rentals
1001+ employees
B2CTransportMobility
Be an early applicant
Salary not provided
Senior and Expert level
Remote from UK
1001+ employees
B2CTransportMobility
Company mission
To build a future where transportation is shared, affordable and carbon-free.
Role
Who you are
- Experience: 5+ years of experience in a dedicated hardware or firmware security engineering role, with a strong focus on embedded systems, platform security, or product security
- Technical Depth: Demonstrated expertise across hardware security domains, with strong proficiency in at least one or two specialized sub-disciplines:
- Firmware security: Secure boot, trusted execution environments (TEEs), firmware integrity, secure update mechanisms
- Platform security: Hardware root of trust, TPM/secure enclaves, cryptographic implementations, SoC security properties
- Physical attack assessment: Fault injection, side-channel analysis, hardware reverse engineering, debug interface security
- Embedded systems security: Microcontroller hardening, RTOS security, hardware-software interface security
- Working familiarity across other hardware security domains and eagerness to grow breadth over time
- Hands-On Skills: Practical experience with hardware security testing methodologies, tools, and lab equipment. Ability to perform black-box security characterization, vulnerability assessment, and security validation of hardware components and firmware
- Problem-Solver: Excellent analytical and problem-solving skills with a proven ability to troubleshoot complex hardware security issues and propose effective, practical solutions that balance security with product requirements
- Communication: Strong written and verbal communication skills, with the ability to articulate complex technical hardware security concepts to both technical and non-technical audiences, including engineering peers and product stakeholders
- Team Player: Ability to work independently and as part of a lean, highly collaborative team, comfortable with remote work environments and cross-functional collaboration with firmware, hardware, and platform engineering teams
- Startup Mindset: Experience or comfort working in a dynamic, fast-paced startup or high-growth environment where you'll need to build processes and programs from the ground up
- Continuous Learner: Passion for hardware security and a commitment to staying current with the latest hardware security trends, attack techniques, and defensive technologies
- Education & Certifications: Bachelor's degree in Computer Engineering, Electrical Engineering, Computer Science, Cybersecurity, or a related field is preferred but not required. Relevant industry certifications such as GIAC Reverse Engineering Malware (GREM), Offensive Security Certified Professional (OSCP), or hardware-focused security certifications are a plus
- If you want to make an impact, Lime is the place for you. Not sure if you meet all the qualifications? If this role excites you we encourage you to apply. Explore all opportunities on our career page
What the job involves
- Lime is the largest global shared micromobility business, operating in close to 30 countries across five continents
- We’re on a mission to build a future where transportation is shared, affordable and carbon-free
- Our electric bikes and scooters have powered more than one billion rides in cities around the world
- Named a 2025 Time 100 Most Influential Company, Lime continues to set the pace for shared micromobility globally, spurring a new generation of clean alternatives to car ownership
- Lime is seeking an experienced Senior Hardware Security Engineer to join our Product Security team
- In this role, you'll be a foundational member of our hardware security efforts, directly contributing to the confidentiality, integrity, and availability of Lime's hardware and firmware platforms
- You will report to the Director of Security and play a key role in building out our hardware security program across our micromobility product portfolio
- We're a fast-paced, lean, and remote-first company, so we're looking for someone who thrives in an evolving environment, is a proactive problem-solver, and is passionate about building scalable and robust security solutions for embedded systems and physical products
- This role is a fantastic opportunity for someone who wants to make a significant impact and help shape the future of hardware security at Lime
- This is a remote position with a requirement for candidates to reside in the United Kingdom to maintain effective collaboration across teams
- This position requires occasional travel to support business operations, which is considered an essential function of the role
- Lime will provide reasonable accommodations as needed
- Security Architecture & Design: Contribute to hardware security architecture reviews for product platforms, providing security input on secure boot chains, hardware roots of trust, trusted execution environments (TEEs), and cryptographic implementations
- Evaluate silicon and SoC security properties through vendor assessment, datasheet review, black-box testing, and security characterization of off-the-shelf and custom components
- Research and evaluate emerging hardware security technologies (e.g., confidential computing, post-quantum cryptographic hardware, hardware-backed attestation) and provide recommendations to the team
- Threat Modeling & Risk Assessment: Conduct threat modeling exercises for hardware and firmware components, identifying attack surfaces across the product stack
- Perform security risk assessments for new and existing hardware designs, quantifying risk and recommending mitigations with clear priority and business context
- Communicate hardware security tradeoffs clearly to engineering peers and product stakeholders
- Security Assessment & Testing: Perform hands-on security assessments of hardware platforms, including side-channel analysis, fault injection testing, firmware reverse engineering, and debug interface evaluation
- Contribute to building and maintaining a hardware security testing methodology and lab environment, including tooling for automated and repeatable assessments
- Participate in vulnerability management for hardware and firmware components, including coordinating disclosure, remediation tracking, and validation of fixes
- Firmware & Platform Security: Develop firmware hardening recommendations and work with firmware engineering teams to implement secure boot, firmware update integrity, tamper detection and runtime protection mechanisms across product platforms
- Contribute to security standards for embedded systems, microcontrollers, and platform firmware across the product portfolio
- Work with platform teams to review hardware-software interfaces (e.g., UEFI, BMC, TPM interactions) for security concerns
- Incident Response & Forensics: Participate in incident response efforts for hardware and firmware security incidents, contributing to investigation, root-cause analysis, and corrective action to prevent recurrence
- Tooling & Automation: Develop and maintain automated security tooling for hardware and firmware analysis, vulnerability scanning, and compliance validation
- Contribute to defining security gates within CI/CD and build pipelines for firmware, working with DevOps and firmware teams to support automated enforcement before production release
- Standards, Policy & Compliance: Contribute to hardware security standards, policies, and procedures that align with industry frameworks (e.g., NIST SP 800-193, Common Criteria, FIPS 140, IEC 62443)
- Support product security certifications and compliance efforts where hardware security attestation is required
- Stay current with the evolving hardware threat landscape, supply chain security concerns, and regulatory requirements
- Collaboration & Mentorship: Serve as a subject matter expert on hardware security within the product security team, providing technical guidance to engineering peers
- Share knowledge and help develop junior team members' hardware security skills through assessment reviews and design reviews
- Help drive adoption of hardware security best practices within your project scope through clear documentation and hands-on support
- Stay Ahead of Threats: Continuously research and evaluate emerging hardware security threats, technologies, and best practices to recommend new approaches and solutions
- Travel: This role requires up to 10% of travel within EMEA and North America
Our take
In recent years, electric-powered mobility companies have attracted an extraordinary amount of interest and funding, in part due to rising eco-friendly sentiment, and in part because of the race to "find the next Uber". Lime is one such company, that has rapidly scaled across multiple geographies to be a key player in the fight for market leadership.
Lime, along with its competitors, has had to grapple with regulation in many of its target markets, but nonetheless has steadily increased its footprint. Since its launch, the company has facilitated millions of trips, making it one of the biggest companies of its kind. Interestingly, the CEO has stated that "cars are our true business rivals—not other scooter companies", suggesting that its biggest business challenge will be to get families to give up their second cars.
With a presence that spans an impressive number of regions - in 2023, Lime began operating in Qatar - the company has cemented itself in the micromobility market and stands to profit from the increasing popularity of these types of services. A substantial increase in ridership enabled Lime to achieve "free cash flow positivity" two years in a row, with suggestions it will pursue a US IPO in 2027.
Freddie
Company Specialist at Welcome to the Jungle
Insights
Top investors
17% employee growth in 12 months
Company
Funding (last 2 of 7 rounds)
Nov 2021
$523m
CONVERTIBLE
May 2020
$170m
SERIES E
Total funding: $1.5bn
Company benefits
- Disability insurance
- 401(k)
Company HQ
The East Cut, San Francisco, CA
Leadership
Toby
(Co-Founder & Board Advisor)Founder and CEO of ZERO&. Was a Marketing Manager at Pepsi for 6 years before doing an MBA at Berkeley. Moved into consulting and VC for 5 years before starting Lime.
Brad
(Co-Founder & Chairman)VP of Business Development at Tencent for 8 years. Managing Partner of a VC firm for 3 years, where he worked with Toby. Has an MBA from Berkeley.
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