Application Guide

How to Apply for Staff Software Engineer

at SPAN

🏢 About SPAN

SPAN is revolutionizing clean energy adoption with intuitive, user-friendly home interfaces that make solar and battery storage accessible to everyone. Their focus on hardware-software integration and sustainability offers a unique opportunity to work on products that directly impact the environment.

About This Role

As a Staff Software Engineer, you'll lead the design of test automation infrastructure, ensuring reliability across firmware, hardware, and test systems. Your work managing a fleet of 50+ hardware test rigs and diagnosing cross-domain failures will be critical to delivering robust, customer-ready products.

💡 A Day in the Life

You might start by reviewing overnight test results from the fleet of 50+ rigs, then dive into diagnosing a flaky failure that involves a firmware bug. After a cross-team sync with Systems and Test Infra, you'll write Python code to improve monitoring dashboards or automate rig provisioning, ensuring engineers can rely on the test infrastructure.

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🎯 Who SPAN Is Looking For

  • An engineer with deep Python expertise in building reliable tools and services, especially for test automation or infrastructure.
  • Experience with hardware-adjacent software, such as controlling or monitoring physical devices (e.g., via I2C, SPI, serial, or data ingestion from sensors).
  • Proven track record of owning internal platform infrastructure used by other engineers, including CI/CD pipelines that run on physical hardware.
  • A systems thinker who can diagnose failures spanning firmware, hardware, and test infrastructure, and improve overall system health.

📝 Tips for Applying to SPAN

1

Highlight specific examples of Python tools you built for test automation or hardware control, including metrics on reliability or efficiency gains.

2

If you've managed a fleet of test devices, describe the scale (50+ rigs) and how you handled monitoring, updates, and failure diagnosis.

3

Emphasize experience with CI/CD pipelines that involve physical hardware (e.g., testing firmware on embedded devices) rather than just cloud services.

4

Tailor your resume to show ownership of infrastructure used by other engineers, including how you gathered requirements and prioritized features.

5

Mention any experience with clean energy or IoT devices, but focus on the intersection of software and hardware reliability.

✉️ What to Emphasize in Your Cover Letter

["Your passion for clean energy and SPAN's mission to simplify home energy management.", 'Specific examples of building test automation infrastructure that improved reliability for hardware-software systems.', 'Your experience scaling and maintaining a fleet of physical test rigs, including monitoring and failure diagnosis.', "How you've collaborated with cross-functional teams (Systems, Test Infrastructure) to co-design solutions."]

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read SPAN's blog or news about their panel and energy management system to understand the product's hardware-software interface.
  • → Look into their engineering culture and values, especially around sustainability and user experience.
  • → Check their GitHub or tech talks for insights into their test infrastructure and Python usage.
  • → Understand the challenges of testing hardware-adjacent software at scale, especially in the clean energy space.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Design a test automation framework for a fleet of 50+ hardware devices with varying firmware versions.
2 How would you diagnose a flaky test failure that sometimes occurs in hardware but not in simulation?
3 Describe a time you improved the reliability of a CI/CD pipeline that involved physical devices.
4 How would you monitor the health of a distributed fleet of test rigs across multiple offices?
5 Walk through your experience with Python libraries for hardware control (e.g., pyserial, pyvisa, or similar).
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⚠️ Common Mistakes to Avoid

  • Focusing only on software abstractions without showing awareness of hardware constraints or failure modes.
  • Ignoring the scale aspect—managing 50+ rigs requires systematic approaches, not ad-hoc scripting.
  • Not demonstrating ownership of infrastructure used by others; avoid vague references to 'team projects' without your specific role.

📅 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 SPAN!

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