Staff Engineer - Stack Integration
Ohmium
Company Overview
Ohmium International
Fremont, CA, United States
2019
Approximately 550 employees (source: linkedin.com). Total funding raised of $311.2 million as of 2023 (source: cbinsights.com).
What They Do
Ohmium specializes in the production of green hydrogen through advanced Proton Exchange Membrane (PEM) electrolyzers. These electrolyzers utilize water and renewable energy sources to generate high-purity hydrogen without relying on fossil fuels (source: ohmium.com). Their flagship product, the Lotus Mark 2 electrolyzer, features a hyper-modular design that includes a centralized water purification unit, glycol-based cooling, and proprietary power electronics, all integrated into a compact footprint that allows for vertical stacking and deployment in various climates (source: ohmium.com). The company offers services such as global remote monitoring and maintenance, ensuring scalability from megawatt to gigawatt levels through standardized designs manufactured in India (source: ohmium.com). Target markets include industrial applications, power generation, and transportation fuels, focusing on sectors that are challenging to decarbonize across the U.S., Europe, India, and the Middle East (source: ohmium.com). Ohmium's competitive edge lies in its high current density, dynamic ramping capabilities, and superior iridium utilization, positioning it favorably against industry competitors like ITM Power and Siemens Energy (source: ohmium.com).
Projects & Track Record
Ohmium has established a robust global project pipeline exceeding 2 GW, demonstrating its reliability in extreme conditions (source: ohmium.com). Among its notable projects is the supply of a 10 MW PEM electrolyzer for Croatia's INA Rijeka Refinery, which aims to decarbonize operations and fuel transport, supported by the EU Recovery and Resilience Facility (source: advancedbiofuelsusa.info). In Spain, Ohmium has committed to supplying up to 52 tons of green hydrogen annually for the EFFI SOLAR GREENH2 PORTUARIO project, which will replace methane in gas flares, significantly reducing CO2 emissions (source: ohmium.com). Additionally, the company signed a term sheet for 300 MW PEM electrolyzers for the OFFSET offshore floating green hydrogen and ammonia project in Southern Europe, with production expected by 2029 (source: canvasbusinessmodel.com). Ohmium's partnerships include collaborations with Invenergy for turbine cooling at the Nelson Energy Center and involvement in India's first green methanol plant (source: cbinsights.com).
Recent Developments
In 2023, Ohmium successfully raised $250 million in Series C financing led by TPG Rise Climate, aimed at scaling manufacturing to 2 GW annual capacity and expanding R&D efforts (source: esgtoday.com). This followed a $45 million Series B round in April 2022, bringing total funding to $311.2 million by late 2025 (source: cbinsights.com). The company also inaugurated a PEM electrolyzer gigafactory in India, which is expected to abate 4 million tons of CO2 annually (source: ohmium.com). In 2024, Ohmium secured a term sheet for a 300 MW project in Southern Europe and partnered for India's first green methanol plant, showcasing its commitment to expanding its footprint in the green hydrogen sector (source: canvasbusinessmodel.com). By 2025, Ohmium achieved UL Solutions' first industrial certification for hydrogen generators using water electrolysis, further solidifying its position in the market (source: ohmium.com).
Working There
Ohmium offers a diverse range of roles across engineering, manufacturing, operations, R&D, compliance, and executive positions, attracting talent from various sectors including electrolyzer and fuel cell technology (source: ohmium.com). The company is primarily hiring for its Fremont, California headquarters, with additional opportunities linked to its gigafactory in India and projects across the U.S., Europe, and the Middle East (source: builtin.com). Ohmium's culture emphasizes innovative problem-solving, speed of execution, and a commitment to human rights compliance, reflecting its mission to advance efficient PEM technology (source: ohmium.com). While specific employee benefits are not publicly documented, the company promotes operational perks through roles in global remote monitoring and performance guarantees (source: ohmium.com). Job seekers are encouraged to visit their careers page for current openings (source: ohmium.com).
Last updated on Feb 23, 2026 | Report an issue
Job Description
We are seeking a highly skilled Senior Stack Integration Engineer to lead the integration and optimization of electrolyzer stack architectures. This role focuses on ensuring robust mechanical, electrochemical, and pressure-performance integration across stack layers to achieve superior durability, efficiency, and operability.
The ideal candidate will have deep expertise in load transfer mechanisms, compression behaviour, and torque-induced sealing performance, along with a strong understanding of electrochemical stack physics.
Ohmium is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.
Key Responsibilities
- Lead the integration of multi-layer electrolyzer stack components (MEA, PTL, gaskets, bipolar plates) to ensure proper fit, function, and performance.
- Define and optimize stack compression strategy, including compression windows, tolerances, and assembly sequences.
- Analyse and control load transfer mechanisms across layers under hydraulic pressing and bolt torquing conditions.
- Ensure uniform contact pressure distribution to balance sealing integrity, electrical contact resistance, and component durability.
- Evaluate mechanical behaviour of layers (elastic/plastic deformation, creep, stress relaxation) under assembly and operating conditions.
- Improve pressure handling capability of the stack, including resistance to leakage, deformation, and mechanical failure.
- Correlate mechanical compression with electrochemical performance (efficiency, voltage losses, degradation).
- Develop and use FEA models to predict stress, strain, and contact pressure distribution across the stack.
- Design and execute validation tests (compression mapping, torque-tension, leak and pressure cycling tests).
- Collaborate cross-functionally to ensure design robustness, manufacturability, and scalability of stack integration solutions.
Required Qualifications
- B.E or M.E in Mechanical or Chemical or Material science background
- 5 to 10 years of experience required in Electrolyzer, fuel cell, or similar electrochemical stack systems or EV systems
- Mechanical integration of multi-layer assemblies.
- Strong understanding of:
- Stack compression mechanics
- Load transfer through layered structures
- Torque-preload relationships in bolted joints
- Experience with:
- Hydraulic press assembly processes
- Gasket sealing mechanics and material behaviour
- Porous transport layer (PTL) compression characteristics
- Ability to interpret:
- Stress-strain curves
- Contact mechanics
- Nonlinear material behaviour.
Apply now
Job expired?Please let Ohmium know you found this job on Rejobs. It helps us grow and get more people working in renewable energy.
Apply now
Job expired?Please let Ohmium know you found this job on Rejobs. It helps us grow and get more people working in renewable energy.
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About the role
June 10, 2026
Full time
Company
- Bengaluru, India
5 to 10 years
UTC+05:30