SECTION I · THE BRIEF
Brief #91942Updated 24 AUG 2026MENLO PARK, CALeverKHOSLA VENTURES
Employbl Company Profile

Senior Software Engineer in Test

Onsite power generation for the net-zero carbon grid.

Location
Menlo Park, CA
Company size
100–500
Posted
1w ago
Via
Lever
Section II · Full ProfileFree with an account
  • 01Comp band & equity packageLocked
  • 02Seniority & experience requirementsLocked
  • 03Interview process & rubricLocked
  • 04Hiring manager & team contextLocked
  • 05Growth trajectory in this roleLocked
  • 06Offer & decision timelineLocked

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Mainspring Energy logo

Senior Software Engineer in Test · Mainspring Energy

View company profile
Job title
Senior Software Engineer in Test
Job location
Menlo Park, CA
Job description

About Mainspring

Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.

The core values that ground our work, guide our decisions, and connect us together:

  • Pragmatic Optimism
  • Excellence without Ego
  • Proactive Collaboration

Job Overview

Do you enjoy diving into building new automation systems and formulating new testing approaches in areas like cloud computing, networking, IoT with real time operating systems, controls, simulations (MIL, SIL, PIL), and algorithms? We combine this technology with our company vision of building a new category of power that is affordable, reliable, and targeting a net-zero carbon grid. This cornucopia of science and technology will be your daily career at Mainspring.


This is an opportunity for you to join a world-class engineering team: to build and run automated testing systems to ensure the quality of the product. This is an exciting opportunity to become part of a rapidly growing engineering team.


In this role. you will have significant influence over the quality of the product, engage with developers to understand new features and technologies, and create innovative automated testing solutions within tight requirements to solve complex scenarios with multiple components.

Responsibilities
  • Architect Automation: Design and scale robust test frameworks and CI/CD integrations
  • System Validation: Create workflows to validate complex hardware/software integrations and resolve system-level bottlenecks
  • Root Cause Analysis: Lead failure analysis and risk mitigation to ensure test stability and environment reliability
  • Strategic Coverage: Drive risk-based testing strategies to ensure comprehensive coverage of all critical-path functionalities
  • Qualifications
  • Experience & Education: Bachelor’s degree in Computer Science or a related field with 6+ years of professional experience, or a Master’s degree with 5+ years in an SDET or Software Engineering role
  • Engineering Mindset: A driven, self-directed contributor who views test infrastructure as a first-class product; you thrive on architecting scalable, automated systems that increase developer velocity
  • Strategic Test Design: Proven track record of leading complex automation projects from design to implementation, with the foundational ability to perform deep-dive manual exploratory testing and technical test case design
  • Technical Versatility: Strong hands-on experience developing in Python and C++, with the flexibility to navigate and contribute to diverse codebases as the project requires
  • AI Workflow Ownership: Demonstrated proficiency in leveraging AI coding assistants as a force multiplier for productivity, combined with the professional judgment to challenge and expand upon AI-generated solutions to ensure system integrity and long-term maintainability
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    Mainspring Energy headquarters

    Menlo Park, CA

    Company size

    100500 employees

    Founded

    2010

    Total raised

    $813,000,000

    View company profile ↗

    Funding rounds