Full-Time

Upstream Bioprocess Engineer

Posted on 9/18/2025

Celgard

Celgard

201-500 employees

High-performance membranes for energy storage

Compensation Overview

$80k - $90k/yr

+ Health benefits + Retirement plan 401K matches up to 8% + Paid time off two weeks + Holidays 10 days + Sick leave 5 days

Fremont, CA, USA

In Person

Category
Process Engineering
Requirements
  • BA/BS in Biological Science, Biotechnology, or Biochemical Engineering with 4 years’ experience in upstream pharmaceutical manufacturing; OR MS with 2 years’ experience in GMP upstream operations.
  • Hands-on experience with mammalian cell culture, seed train expansion, and bioreactor operations.
  • Knowledge of process automation and single-use technologies.
  • Familiarity with scientific principles driving biologics production.
  • Strong deviation ownership, CAPA development, and technical writing skills.
  • Ability to troubleshoot complex upstream issues and coach others effectively.
  • Strong problem-solving and facilitation skills.
  • Experience in training/mentoring operators in GMP upstream processes.
  • Project management or Operational Excellence/Six Sigma background.
Responsibilities
  • Serve as SME for upstream unit operations (media prep, inoculation, seed train, bioreactor operation, harvest).
  • Provide technical guidance to operators and support resolution of real-time process or equipment issues.
  • Monitor upstream process parameters (CPPs, CQAs) to ensure compliance with process control strategies.
  • Material management and coordination with Supply Chain
  • Investigate, manage, and own upstream-related deviations in the Quality Management System.
  • Perform root cause analysis and implement effective CAPAs.
  • Manage upstream-related change controls and ensure successful implementation.
  • Develop and deliver upstream-specific GMP and technical training for manufacturing staff.
  • Mentor operators on aseptic technique, bioreactor operations, and harvest practices.
  • Ensure training records are current and compliant with Bionova's standards.
  • Support MSAT with technology transfer.
  • Identify and implement process improvements to increase yield, robustness, and efficiency in upstream operations.
  • Apply Lean/Six Sigma tools to optimize workflows and reduce variability.
  • Author, revise, and review upstream SOPs, Electronic batch records, and work instructions.
  • Ensure readiness for audits by maintaining GMP compliance across upstream operations.

Celgard makes and sells high-performance membrane materials and thin separators used inside batteries, as well as fabrics for outdoor apparel and medical PPE. The membranes sit between battery electrodes to prevent contact while allowing ions to pass, enabling safe and efficient operation in lithium-ion and other chemistries. The company stands out through its Asahi Kasei Group affiliation and strategic alliances (such as with Æsir Technologies) to pursue new battery chemistries, while expanding manufacturing capacity. Its goal is to provide reliable membranes and protective fabrics at scale to support safer, longer-lasting energy storage and protective textiles, and to drive industry growth through collaborations.

Company Size

201-500

Company Stage

N/A

Total Funding

N/A

Headquarters

Charlotte, North Carolina

Founded

N/A

Simplify Jobs

Simplify's Take

What believers are saying

  • Charlotte plant expansion adds 100 jobs, boosts LIB separator capacity for EVs.
  • Asahi Kasei invests in Hipore wet-process coating lines at Charlotte site.
  • Proven separators serve CATL, Panasonic in high-performance EV, ESS applications.

What critics are saying

  • CATL's in-house separators capture 39% EV market, cut Celgard revenue 10-15% by 2027.
  • SK Innovation, Toray wet-process tech displaces dry-process, erodes share in 12 months.
  • Solid-state batteries from Toyota, QuantumScape eliminate separators by 2028.

What makes Celgard unique

  • Celgard specializes in solvent-free dry-process microporous membranes for lithium-ion batteries.
  • Global facilities in USA, China anchor manufacturing for EV battery separators.
  • Strategic alliances with Æsir, Lithion, C4V target Ni-Zn, LFP, BM-LMP batteries.

Help us improve and share your feedback! Did you find this helpful?

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Life Insurance

Disability Insurance

401(k) Company Match

Paid Vacation

Paid Sick Leave

Paid Holidays

Company News

Yahoo Finance
Jan 29th, 2024
Celgard and Æsir Technologies Forge Strategic Alliance to Drive Industry Innovation in Nickel-Zinc, Zinc-Air and Lithium-Zinc Batteries

Together, Celgard and Æsir will collaborate on joint research projects to further develop high-technology next-generation Nickel-Zinc (Ni-Zn), Zinc-Air (Zn-Air), Lithium-Zinc (Li-Zn) and Sodium-Zinc (Na-Zn) batteries used primarily in aviation, data centers, telecom, energy infrastructure and electric vehicle (EV) charging applications.

Plant Services
Nov 30th, 2023
Celgard expands North Carolina manufacturing plant to support electric vehicle supply chain

Celgard, LLC has announced plans to expand its manufacturing facility in Charlotte, North Carolina, generating 100 new jobs in the process.

PR Newswire
Oct 31st, 2023
Celgard Charlotte Manufacturing Facility To Expand Battery Separator Capacity And Create New Jobs

Celgard to expand facilities, workforce and product portfolio to better serve the EV battery separator supply chain. Post thisThe Biden-Harris Administration and the U.S. Department of Energy (DOE) have identified the domestic U.S. battery market as a critical supply chain focus area for the nation. Investments in Celgard's Charlotte plant will allow the company to expand existing infrastructure to quickly meet demand of the lithium-ion battery (LIB) separator supply chain and domestic customers.Celgard manufactures dry-process membrane separator also used in vehicle electrification. The company already has a skilled employee base capable of applying technical coatings to base film shipped from Hipore™ sister locations and completing finishing steps required to meet customer specifications

Tamarindo
Jun 13th, 2023
Celgard & Lithion Battery form battery storage alliance | Tamarindo

US-headquartered Celgard, a subsidiary of Polypore International, has formed a strategic alliance with Lithion Battery, whereby the two companies will undertake joint development of battery separators for lithium-ion cells for energy storage systems and microgrids.

PR Newswire Asia
Jun 7th, 2023
Celgard Takes Another Step In Energy Storage Growth As It Forms Strategic Alliance With Lithion Battery For Next-Generation Battery Cells

CHARLOTTE, N.C., June 7, 2023 /PRNewswire/ -- Celgard, LLC (Celgard), a subsidiary of Polypore International, LP (Polypore), is pleased to announce a newly formed strategic alliance with Lithion Battery, Inc. (Lithion), whereby the two companies will undertake joint development of battery separators for next generation lithium-ion cells with Lithium Iron Phosphate (LFP) cathode material. Through this collaborative effort, the companies will meet the ever-growing demand of supplying consistent power to those in need with energy storage systems (ESS) for uses such as micro-grid power applications. The cells could also be deployed in medical tools and military and industrial markets, where Celgard has been providing separator solutions for decades.

INACTIVE