Senior Staff Engineer - Battery Cell Stack

Archer Aviation is developing all-electric vertical takeoff and landing (eVTOL) aircraft in San Jose, California. The company’s mission centers on creating sustainable air mobility solutions, with aircraft designed to carry four passengers while minimizing noise for quieter, cleaner transportation. Archer values diversity and inclusion, encouraging every team member’s perspective and fostering equity throughout the workplace. Role overview The Senior Staff Engineer - Battery Cell Stack will lead the design and development of high-voltage battery pack components for both commercial and defense eVTOL aircraft. This position plays a key role in shaping battery technology for multiple aircraft programs. What you will do Oversee the full design process for high-voltage battery pack components across several aircraft platforms. Collaborate with CAE engineers, quality assurance, testing, supply chain, and manufacturing teams to align on project goals. Engage in hands-on prototyping, assembly, and root cause analysis during the design cycle. Work with integration and certification teams to ensure battery systems meet FAA certification standards. Create and refine battery design solutions that fulfill strict aerospace requirements. Establish and promote design standards and best practices for Archer’s battery systems. Mentor junior engineers working on battery design. Develop and maintain the battery hardware technology roadmap for future products and applications.

Archer, an innovative aerospace company located in San Jose, California, is pioneering the development of an all-electric vertical takeoff and landing aircraft. Our mission is to enhance sustainable air mobility, designing and manufacturing aircraft capable of carrying four passengers with minimal noise pollution.We set ambitious goals and tackle complex challenges, believing that a diverse workplace fosters smarter solutions and deeper insights, driving our collective success. We are committed to creating an equitable and inclusive environment that values our differences and supports all team members.What You’ll DoLead and execute comprehensive abuse testing for cells, modules, and battery packs, focusing on Thermal Runaway, Short Circuit, Over-Temperature, Overcharge, and Overdischarge scenarios.Conduct thorough data analysis and compile detailed reports.Design and develop sub-scale and full-scale test rigs for Safety/Abuse tests, including PCBA/hardware and software integration.Create and deploy custom thermal abuse test equipment and controllers.Develop bespoke test equipment and automation software to facilitate cross-functional battery R&D testing.Utilize NX CAD software for the mechanical design of test rigs.Enhance test development using LabVIEW, Python, and other relevant tools.Assist in the assembly of small-scale buck and prototype builds.Provide support for troubleshooting and preventative maintenance of battery testing equipment and setups.Contribute to failure review processes.Work alongside the battery engineering team on cell, buck, and pack teardown procedures.Innovate and implement new test procedures, executing them effectively.Generate reports for submission to the FAA.

Archer Aviation, based in San Jose, California, develops all-electric vertical takeoff and landing aircraft. The company focuses on advancing sustainable air mobility, designing vehicles that carry four passengers and operate with low noise. Archer values a diverse team and aims to create an inclusive workplace where different perspectives drive better solutions. The company encourages collaboration and respects the unique contributions of every employee. Role Overview The Senior Battery Design Engineer will lead efforts to design high voltage battery pack components for multiple aircraft programs, including both commercial and defense projects. This role covers the full design process, from initial concept through completion. What You Will Do Lead design of high voltage battery pack components across various aircraft programs, from concept to final product. Collaborate with CAE engineers, quality assurance, testing, supply chain, and manufacturing teams to ensure strong design and product quality. Provide hands-on support for prototyping, assembly, and troubleshooting throughout the design cycle. Work with integration and certification teams to meet all FAA certification requirements. Develop innovative battery designs tailored to the demands of aerospace applications.

Archer Aviation is a pioneering aerospace firm headquartered in San Jose, California, dedicated to developing an all-electric vertical takeoff and landing (eVTOL) aircraft. Our mission is to enhance sustainable air mobility, designing and manufacturing an aircraft that can transport four passengers with minimal noise and environmental impact.We aim high and tackle challenging problems, believing that a diverse workforce fosters innovation, insights, and collective success. Our commitment is to create an equitable and inclusive workplace that values our unique perspectives and supports every member of our team.Key Responsibilities:Conduct electrical and environmental testing of prototype and certified batteries for eVTOL aircraft.Collaborate with cross-functional teams to create and implement test plans for flight-critical hardware.Execute acceptance testing on battery modules, packs, and charge port assemblies.Design sub-scale test rigs for mechanical and environmental testing, involving PCBA/hardware and software development.Develop and deploy custom test equipment and controllers.Create bespoke test equipment and automation software to facilitate cross-functional battery R&D testing.Perform mechanical design of test rigs using NX CAD software.Utilize LabVIEW, Python, and other test development tools for testing purposes.Analyze test data and collaborate with engineering teams to share insights.Develop automated test equipment as required.Innovate test procedures and oversee testing execution.Generate reports for FAA submission.

Archer is a pioneering aerospace company located in San Jose, California, dedicated to developing an innovative all-electric vertical takeoff and landing aircraft. Our mission is to promote sustainable air mobility, designing, manufacturing, and operating an aircraft that accommodates four passengers while minimizing noise pollution.We aim high and tackle complex challenges, believing that a diverse workforce enriches our insights and propels us towards collective success. Archer is committed to fostering an equitable and inclusive environment that values differences and celebrates each team member.What You’ll Do:As a Battery Controls Integration Engineer at Archer, your primary responsibilities will include the integration of our high-voltage battery controls system onto test platforms, ensuring the verification of Battery Management System (BMS) safety-critical functions. This role is essential for facilitating the use of electric vertical-takeoff-and-landing aircraft in urban air mobility settings. Your contributions will encompass all stages of the product development lifecycle, including development, implementation, validation, and ongoing improvement.Core Responsibilities and Development Focus:Verification and Testing Strategy: Design and implement verification procedures and test plans across various testing environments including Simulation, Software-in-the-Loop (SIL), and Hardware-in-the-Loop (HIL).Integrated Testing Ownership: Lead the testing of the Battery Management System (BMS) controls hardware/software integrated system functionalities on safety-critical components, utilizing HIL, SIL, and high-voltage (HV) integrated labs.Automation and Infrastructure: Update and maintain automated test cases in alignment with BMS functionality development for effective verification and regression testing, particularly in model-based environments.Test System Development: Offer commissioning and maintenance support for the comprehensive testing infrastructure required for HIL testing of BMS controls, algorithms, and software.Process and Infrastructure Improvement: Take responsibility for the automated testing platform, enhancing efficiency, accuracy, and automation level for BMS control system verification. Contribute to continuous improvement of test infrastructure, including writing and debugging test scripts for HV HIL systems.Cross-Functional Collaboration and Integration:...

Archer Aviation, an innovative aerospace firm headquartered in San Jose, California, is on a mission to revolutionize air travel with our all-electric vertical takeoff and landing aircraft. Our commitment to sustainable air mobility drives us to design, manufacture, and operate an aircraft capable of carrying four passengers while minimizing noise pollution.We are passionate about addressing complex challenges and believe that a diverse workforce enhances our problem-solving capabilities, leading to superior insights and success. We strive to foster an equitable and inclusive workplace that celebrates the unique contributions of every team member.Key Responsibilities:Conduct verification and validation of safety-critical software components for the aircraft battery management system (BMS) in alignment with DO-178C standards.Develop and document detailed test plans, cases, and procedures based on software requirements.Perform Software-in-the-Loop (SIL) and Hardware-in-the-Loop (HIL) testing to validate battery algorithms and drivers.Identify, document, and manage software defects using automated tracking systems; collaborate with development teams to analyze root causes and validate resolutions.Create and uphold automated test scripts and frameworks (C/C++, Python) to optimize testing efficiency and coverage.Design and implement tests for verifying software fault detection and diagnostic algorithms, including insulation breakdown, short circuits, and sensor failures.Analyze sensor data (cell voltages, pack current) and test outcomes to ensure accurate state estimation and protective function performance.Engage in software audits and reviews to ensure compliance with DO-178C certification requirements.

About Archer Aviation Archer Aviation, based in San Jose, California, is developing an all-electric vertical takeoff and landing (eVTOL) aircraft designed for sustainable air mobility. The company aims to create a quiet, environmentally conscious aircraft that seats four passengers. Archer values ambitious goals, technical challenges, and a workplace that welcomes diverse perspectives and backgrounds. Role Overview: Battery Test Engineer - Electrical The Battery Test Engineer - Electrical will focus on the testing and validation of battery and battery management system (BMS) components for Archer's eVTOL aircraft. This role involves hands-on work with prototype and certified hardware, as well as collaboration with multiple engineering teams. Main Responsibilities Conduct systems and integration testing for prototype and certified battery and BMS components. Work with teams across BMS, Controls, Engines, Flight, Integration, and Systems to develop and execute testing plans for flight hardware. Assist with regression testing activities. Support testing related to electromagnetic compatibility (EMC), short circuit, and electrical design infrastructure. Develop and test mission profiles for battery systems. Help build digital testing infrastructure for data storage and analysis. Analyze test data and collaborate with engineering teams to drive improvements. Design and implement automated test equipment as needed. Support electrical infrastructure design for Production and Reliability labs. Prepare technical reports for FAA regulatory submissions.

Join Archer, a pioneering aerospace company headquartered in San Jose, California, where we are dedicated to revolutionizing sustainable air mobility through the development of all-electric vertical takeoff and landing (eVTOL) aircraft. Our innovative designs prioritize minimal noise and environmental impact while enabling efficient transportation for up to four passengers.At Archer, we are committed to tackling complex challenges and fostering a diverse workplace, believing that inclusivity drives greater insights and collective success. We strive to create an equitable environment that values and celebrates the unique contributions of all our team members.Your Role:As a Battery Controls Engineer, you will be instrumental in defining, validating, implementing, and verifying advanced high-voltage battery charging and thermal management algorithms tailored for our Midnight eVTOL aircraft. You will oversee the entire product development life cycle, from initial concept to final certification.Design and enhance cutting-edge control algorithms for high-voltage battery charging and thermal management.Conduct comprehensive validation of control software through SIL (Software-in-the-Loop), MIL (Model-in-the-Loop), HIL (Hardware-in-the-Loop), and aircraft-level integration testing to ensure optimal system reliability under all operating and environmental conditions.Analyze lab, flight, and field data to troubleshoot complex issues, refine algorithms, and enhance charging performance continuously.Collaborate closely with hardware, software, and systems engineering teams to establish requirements for charge control subsystems.

Drive Innovation with PurposeAt BILL, we empower businesses that fuel our economy by modernizing outdated financial processes with cutting-edge tools. We aid companies—ranging from startups to established enterprises—in making informed decisions and gaining operational control. Our mission extends beyond mere solutions; we are pioneering the future of financial automation, allowing businesses to focus on what truly matters.Joining us means being part of a visionary team eager to confront challenges and develop innovative solutions. We cherish purpose, drive, and curiosity, thriving in a dynamic and fast-paced environment. Whether you're based in our San Jose, CA office, our Draper, UT location, or working remotely, BILLers collaborate to create substantial impact for businesses seeking additional time in their busy schedules.At BILL, we build high-performing teams and actively seek the best talent for every position. We are committed to fostering a workplace that embraces inclusion and diverse perspectives, appreciating each individual’s unique skills and experiences. We would love to hear from you—your skills may be just what we need, whether for this role or another. Let’s give businesses more time for what matters.Make an Impact at a Rapidly Growing Fintech CompanyJoin BILL’s Account Payables - Multi-Entity team, where we are revolutionizing the management of complex financial operations across multiple entities, subsidiaries, and locations. As a Senior Software Engineer, you will design and scale innovative back-office solutions, handling enterprise-level data volumes and intricate workflows that empower Lower Mid-Market Customers and Accountants to optimize operations through our flagship Multi-Entity (ME) offering.This team operates with a “startup” mentality within the broader AP operations, having developed a core platform from the ground up in the last year that efficiently manages data across hundreds of entities with a focus on reliability, performance, and availability. This is your chance to thrive in a collaborative, high-growth environment where your technical expertise will directly shape BILL’s vision to empower businesses through financial automation. Please note that this position operates in a hybrid work model from our San Jose office.

At Archer, we are pioneering the future of aviation with our all-electric vertical takeoff and landing aircraft, designed to enhance sustainable air mobility. Our innovative engineering team is dedicated to creating an aircraft that accommodates four passengers with minimal noise pollution.We believe that tackling complex challenges requires a diverse team, and we are committed to fostering an inclusive workplace that values and celebrates our unique perspectives. Join us in our mission to revolutionize air travel.Key Responsibilities:As an Electrical Analysis Engineer, you will play a critical role in the analysis of circuits within Archer's high voltage battery management system. Your contributions will directly impact the safety and reliability of our innovative aircraft.Conduct thorough circuit schematic analyses, collaborating with safety engineers to identify potential single-point failures.Evaluate the system-level implications of individual component failures within printed circuit board assemblies (PCBAs).Aggregate power consumption data of the BMS PCBAs across various operational modes and correlate findings with laboratory tests.Perform worst-case accuracy analyses on measurement circuits.Utilize circuit simulation tools to model and analyze hardware circuits to support accuracy evaluations.Employ software for automated circuit analysis to facilitate schematic-level Failure Modes and Effects Analyses (FMEAs).Assess the system-level impacts of single-event upsets and latch-ups.Collaborate with reliability engineers to understand electrical operating conditions and determine failure rates.Carry out electrical stress analyses and component derating evaluations for individual components.Work closely with design engineers to ensure BMS hardware meets Archer's stringent safety, accuracy, and reliability standards.

At Antora, we are revolutionizing industrial energy solutions by developing advanced thermal batteries designed to deliver continuous, low-cost energy for industrial operations. Proudly manufactured in the U.S., our modular thermal batteries provide dependable heat and power, empowering industrial facilities of any size to achieve predictable and profitable decarbonization. We are on a mission to electrify global industry while supporting American manufacturing, reducing energy costs for consumers, and enhancing the competitiveness of U.S. industry.We are expanding our team with individuals who prioritize collaboration and purpose, cherish connection through laughter and joy, and approach their work with humility and openness. Our commitment to fostering a diverse, passionate, and innovative team is unwavering as we strive for a future where every industrial facility worldwide is powered by abundant, clean, low-cost energy.Position SummaryWe are on the lookout for a Senior / Staff Systems Engineer in San Jose—an enthusiastic, inquisitive, and dedicated engineer to join our Technology Development team. Your expertise will contribute to delivering zero-carbon industrial heat and power through our innovative solid-state thermal battery solutions.This role is deeply collaborative and central to system innovation. You will engage across various disciplines to influence the architecture and operational philosophy of Antora’s future offerings. Leveraging first-principles modeling, data analytics, and real-world performance insights, you will accelerate our mission to decarbonize the industrial sector at scale.

About Archer Archer, based in San Jose, California, designs and builds all-electric vertical takeoff and landing aircraft. The company focuses on sustainable air mobility and aims to transport four passengers while reducing noise pollution. Archer values diversity and strives to create an inclusive workplace where every team member’s perspective contributes to smarter solutions. Role Overview The Thermal Analysis Engineer for Battery Systems will support the design and performance of battery packs and modules for Archer’s aircraft. This position involves simulation, testing, and collaboration across multiple engineering teams to ensure reliable and safe thermal management. Main Responsibilities Run thermal analysis and simulations on battery packs and modules using advanced CAE tools. Develop simulation methods and workflows to improve team productivity. Design and optimize battery thermal management systems, including cold plates and phase change materials, to achieve high performance and safety. Plan and conduct thermal testing to validate and refine analytical models. Work closely with mechanical, electrical, control, and systems engineering teams to integrate thermal solutions and models. Prepare detailed reports and presentations documenting findings, design recommendations, and test results.

About Archer Aviation Archer Aviation, based in San Jose, California, is developing all-electric vertical takeoff and landing aircraft designed to transport four passengers with low noise and minimal environmental impact. The company is committed to advancing sustainable air mobility and values a diverse, equitable, and inclusive workplace where every team member can grow professionally. Role Overview The Battery Test and Build Technician will support the design, assembly, and testing of battery systems and related components. This hands-on role involves building prototypes, supporting equipment assembly, and assisting with battery charging operations for ongoing projects. What You Will Do Build battery packs, cell bucks, and components for Battery BMS, including design and testing tasks. Assist with assembling Battery EOL (End of Line) equipment. Support mechanical builds for advanced project testing. Fabricate securing hardware and harnesses for use with testing equipment and assets. Construct test fixtures for cells, bucks, and packs. Perform small-scale buck and prototype builds. Assist with battery pack charging operations. Location San Jose, California, United States

Archer Aviation Inc., situated in the heart of San Jose, California, is at the forefront of aerospace innovation, dedicated to constructing an all-electric vertical takeoff and landing aircraft. Our mission is to revolutionize sustainable air mobility by designing, manufacturing, and operating aircraft capable of transporting four passengers with minimal noise pollution.We aspire to achieve remarkable advancements while tackling complex challenges. We firmly believe that a diverse workforce enhances our intelligence, drives insightful solutions, and propels us toward collective success. Our commitment is to foster an equitable and inclusive work environment that honors our differences and uplifts every member of our team.The RoleIn the role of Senior Staff Systems Engineer within the Air Vehicle group, you will focus on Mechanical Systems. You will engage with various systems including Landing Gear, Cabin, Closures, Environmental Control, Airframe, and Wiring Systems, taking on the responsibility as the Systems Engineer for one of these areas. This position allows you to bridge the gap between high-level aircraft requirements and detailed component design, ensuring seamless interfaces. Your confidence and eagerness to collaborate with multiple disciplines across the organization will be paramount to your success.What you’ll do:Collaborate with diverse engineering teams to design high-reliability, safety-critical systems for aircraft.Lead the preparation of reports to validate system readiness for key milestone reviews.Serve as the primary contact for system-level documentation and reporting.Drive change management initiatives within a complex product structure.Lead efforts to:Conduct operational and functional analyses,Define and decompose system requirements with traceability through overall system architecture,Establish and manage technical/programmatic performance metrics (cost, weight, performance objectives),Ensure full compliance with safety regulations.Collaborate with technical disciplines to develop verification plans, support verification/test planning, and conduct assessments to demonstrate compliance with system requirements.

Join FloQast as a Senior Staff Engineer, Data, and become an integral part of our technical leadership team. In this role, you will spearhead the design, implementation, and continuous enhancement of FloQast’s core data platform. You will set the standards for data ingestion, governance, storage, processing, and access that empower our product and analytics systems. Your contributions will establish a robust, scalable, and secure data foundation that enables our engineering, product, and business operations teams to thrive.Note: Visa sponsorship is not available at this time.

The Trade Desk is looking for a Senior Full Stack Software Engineer to join the Omnichannel division. This position centers on designing and building software that enhances user experiences across a range of platforms. Projects involve both web applications and integrated advertising technology. Key responsibilities Collaborate with engineering, product, and design teams to deliver applications for the omnichannel platform Develop and maintain software that integrates with The Trade Desk’s advertising technology stack Work on both front-end and back-end systems to support seamless user interactions Locations This role is open in Bellevue, Boston, Boulder, Chicago, Denver, Irvine, Los Angeles, New York, San Francisco, San Jose, Seattle, and Ventura.

Location: San Jose or Los Angeles, CA (Hybrid)At FloQast, we are on a mission to revolutionize the way accounting teams function by leveraging AI-driven workflows. Our platform, recognized and trusted by thousands of companies worldwide, serves as a robust operating system for accounting, simplifying complex financial processes into quick, dependable, and scalable systems.We are seeking a Senior Staff Software Engineer who is not just a software builder, but a platform architect who accelerates team performance and catalyzes significant innovations.This pivotal role involves making architectural choices that will shape the entire FloQast application ecosystem, significantly enhancing innovation across our product suite.

Antora is on a mission to revolutionize industrial energy solutions by designing and implementing cutting-edge thermal batteries that provide reliable, low-cost energy for industrial operations. We are looking for a dynamic and driven Senior Mechanical/Process Engineer to join our San Jose, California team. In this pivotal role, you will be instrumental in optimizing our balance of plant (BOP) systems, focusing on cost efficiency and performance enhancements. Your expertise will be integral in developing and refining cost models based on comprehensive technical and commercial data, guiding the design and evolution of high-performance plant processes and systems. You will also take charge of scoping, defining, and designing BOP systems for our commercial thermal energy storage projects. As a key player in our rapidly growing cross-functional organization, your contributions will directly support the deployment and scaling of innovative long-duration energy storage technologies.

Archer Aviation builds all-electric vertical takeoff and landing aircraft in San Jose, California. The company focuses on sustainable air mobility, designing aircraft for four passengers with an emphasis on reducing noise. Diversity and inclusion matter here. Archer values a workplace where different perspectives drive better solutions and support every team member’s growth. Role Overview The Senior Staff Backend Engineer, Platform Core, shapes the core services that support Archer’s platform. This includes building and maintaining the Entity Registry, implementing change tracking, developing typed source system connectors, and supporting integration infrastructure used by all applications. The role centers on backend development in Go, tuning PostgreSQL for performance, and designing robust infrastructure. These systems are accessed by application teams through the Platform SDK.

Join Us at BetterHelpAt BetterHelp, we are dedicated to eliminating traditional obstacles to therapy and making mental health support accessible to all. Founded in 2013, we have become the world's largest online therapy service, ensuring affordable and convenient therapy options globally. With a network of over 30,000 licensed therapists, we have empowered millions to take charge of their mental well-being. As the demand for mental health services continues to rise, BetterHelp stands committed to being an integral part of the solution.As a Senior Full Stack Software Engineer, you will be a key member of a diverse team that includes clinicians, engineers, product experts, creatives, marketers, and business leaders—all passionate about expanding therapy access. We prioritize our employees' mental health as much as our mission, investing in their well-being and professional growth because we believe that organizational and personal development go hand in hand. At BetterHelp, you will forge your own path, make a significant impact, and face daily challenges, supported by a nurturing community.