Senior Software Engineer, Firmware

Purposebrands

. Own, design, create, and maintain the connected fleet of devices .

Posted 10/8/2026full-timeUnited StatesSenior💰 $140,000 - $155,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and maintaining firmware for microcontrollers, integrating hardware with backend systems, and developing automated testing frameworks. Proven ability to manage complex hardware projects and collaborate effectively across teams to ensure product stability and performance.

Highest-signal resume keywords

C++ Firmware DevelopmentMultithreaded Application ProgrammingAutomated Testing (GTest, GMock)Microcontroller Integration (I2C, RS485, SPI, BLE)Cloud-Native Backend Development (.NET, Java, Kotlin)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Firmware DevelopmentMicrocontroller Programming (C/C++)Automated TestingHardware IntegrationDebugging Wiring DiagramsReal-Time Systems DevelopmentInfrastructure as Code (Terraform)CI/CD Management (GitHub Actions)Mobile Development (iOS, Android)Microservices Development

Soft Skills

Self-DirectedOrganizational SkillsCollaborationProblem-SolvingTechnical Communication

Tools & Technologies

CMakeESP32NRFRaspberry PiArduinoTeamCityCryptographic ToolsTechnical DocumentationSupply Chain ManagementLogistics Coordination

Industry Keywords

Connected FleetAccess Control SystemHardware SpecializationBackend SpecializationReal-Time Connected Systems

Tech Stack

Tools & technologies

AndroidCloudiOSJavaKotlinMicroservicesTerraformC++.NET

About the role

Key responsibilities & impact

Own, design, create, and maintain the connected fleet of devices
Design, write, and maintain C++ firmware code for the Access Control System
Manage integration between hardware and backend systems
Identify, design, and develop internal tools for fleet management
Write and maintain the automated testing suite
Write and maintain technical documentation
Collaborate with firmware, backend, QA, and lead engineers
Work with hardware design vendors to specify and deliver new hardware revisions
Write, develop, and execute acceptability and manual test plans
Assist the support team in debugging intricate hardware problems globally
Serve as the go-to resource for deep technical questions about the hardware technology stack
Collaborate with hardware and SaaS vendors
Collaborate with Supply Chain, Warehouse, and Provisioning teams to ensure stable product availability

Requirements

What you’ll need

Proven ability to set and hit commitments while maintaining technical excellence
Proven ability to self-direct and organize in a fast-paced distributed collaborative environment
Proficiency in writing firmware for microcontrollers (C/C++)
Proficiency in multithreaded applications (mutexes/threads/pthreads/etc.)
Experience in writing and integrating automated test cases (GTest, GMock, etc.)
Deep knowledge in at least one Nice-to-have section
Over 5 years of experience developing hardware products from design to rollout (hardware specialization)
Experience integrating I2C / RS485 / SPI / BLE / digital IO
Deep experience with microcontrollers or projects (ESP32, nRF, Raspberry Pi / Arduino, etc.)
Experience reading and debugging wiring diagrams
Experience designing hardware projects end-to-end
Experience reading and integrating technical specification documentation
Experience working with contract manufacturers and logistics
Experience with toolchains and build chains (CMake/linkers/etc.)
Proven ability debugging intricate hardware problems at global scale
Over 5 years of experience delivering real-time connected backend systems (backend specialization)
Experience developing cloud-native backend applications (.NET/Java/Kotlin/other)
Experience developing and integrating microservices
Experience developing and integrating AuthZ/AuthN/OAuth2
Experience managing certificates and working with cryptographic tools
Experience with Infrastructure as Code (Terraform/CDK/other)
Experience developing build systems and/or managing CI/CD (GitHub Actions, TeamCity, etc.)
Experience in mobile development (iOS or Android or both)
Experience interfacing with microcontroller BLE in Peripheral and Central modes
Experience developing real-time hardware integrations
Degree in an appropriate field is mentioned as something that would excite us, not required

Benefits

Comp & perks

Medical, Dental and Vision Coverage
Hybrid Work Environment
Life and Disability Insurance
Unlimited Time off + Paid Holidays
Flexible Friday's between Memorial Day and Labor Day
401(K) Savings Plan Matching at 4%
10 Coaching and Therapy sessions
Mental Health Benefits
Brand Discounts & Reimbursements
In-house workout facilities
Professional Development Opportunities
Team Building, Employee Engagement Activities & so much more