Mainspring Energy - Senior Electrical Systems & Sustaining Engineer

• 5+ years of experience with a Bachelor's degree, or 4+ years of experience with a Master's degree, in Electrical Engineering or a related field. This background must be in an Electrical, Product, or Reliability Engineering capacity with a clear track record of owning complex circuit/schematic analysis, physics-based root-cause investigations, and the full engineering change (EC) design lifecycle • Technical Acumen: Strong foundational expertise in complex electronics and hardware systems (preference for broad mechatronics/electronics experience over purely facility power systems) • Hands-on Lab Experience: Proven competency in a physical hardware lab environment setting up test benches, instrumenting hardware under test, and maintaining clean, safe laboratory testing practices • Problem-Solving DNA: A genuine passion for hardware debugging and structured root-cause failure analysis (e.g., 8D, 5 Why, Fishbone diagrams) on complex physical systems. You are not satisfied with the first layer of failure and have a tenacity towards finding the true root cause • Design Ownership for Reliability: Directly drive the continuous improvement of our deployed hardware ecosystem. You will have the technical authority to own and execute the engineering change lifecycle—from designing and releasing targeted PCBA revisions to identifying, testing, and qualifying strategic off-the-shelf (OTS) components—to permanently eliminate failure modes and elevate system robustness • Systems-Level Perspective: The ability to zoom out and understand complex interdependencies across circuitry, firmware, manufacturing and mechanical wear mechanisms within a massive multi-domain machine • Cultural Alignment: Embody Mainspring's foundational pillars on a daily basis: bring Pragmatic Optimism to highly complex engineering challenges, exercise Excellence without Ego when collecting or delivering rigorous technical feedback, and drive Proactive Collaboration across separate team boundaries • Full Hardware Lifecycle Exposure: Experience navigating the full hardware development life cycle—from initial requirements gathering and schematic capture through manufacturing optimization and sustaining field support • Process Discipline & Tools: Prior experience working within formal CAPA structures, quality management frameworks, and bug/incident tracking ecosystems (e.g., Jira, Confluence) • Fast-Paced Environments: Prior experience working within a startup, rapid product development environment, or a scaling hardware company where agility and self-direction are mandatory • ECAD Tools: Proficiency with professional ECAD software layout and schematic design tools, preferably Altium Designer • Software & Scripting: Familiarity with the Python for data parsing, automated test script creation, or querying hardware telemetry logs • Modern Version Control: Experience utilizing Git-based version control workflows (GitHub or GitLab) for tracking hardware code, scripts, or engineering documentation • $130,050 - $153,000 a year • This is a hybrid position (onsite + remote) and will require you to be onsite as required to perform testing, troubleshooting, manufacturing support, etc. The salary will be adjusted to reflect local market conditions based on employee location as well as the experience of the employee. Along with the base salary, Mainspring offers pre-IPO stock options + benefits.