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Principal Optical Engineer

Thales Defense & Security

Billerica, MA · Posted November 4, 2026

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About the job

Thales Defense & Security, Inc. (TDSI) Headquartered in Clarksburg, MD, is a U.S. company that has been serving domestic and international defense Air, Land and Sea domains for 60+ years. With over 1,000 employees, TDSI and its four subsidiaries (Advanced Acoustic Concepts, Digital Receiver Technology, Tampa Microwave, and Trusted Cyber Technologies), supports U.S. Joint Services, special operations forces and multi-national partners with a variety of communication, visualization, signal intelligence/electronic warfare, and sensor/sonar capabilities. TDSI’s key technologies include tactical handheld radios, expeditionary satellite terminals, helmet-mounted displays, optics and target recognition capability, advanced radars, undersea sensing and missile systems. Lives depend on what we do!

Top Benefits (Subject to terms of applicable policies/plans)

Competitive Salary

Yearly Incentive Compensation Plan

Medical insurance for self and eligible family members

Generous 401(k) program- up to 7% company contribution and 100% immediate vesting

Tuition Reimbursement

Paid wellness, vacation, and holiday leave

Paid maternity, paternity, and parental leave

9/80 Work Schedule (every other Friday off)

Hybrid working environment

We have an exciting opportunity for a Prinicpal Optical Engineer in our Billerica, MA office .

Responsibilities

Design, analyze and build optical systems and display devices, specifically Head-Mounted Displays (HMD)

Design and develop optical components (waveguide, projector, intervening optics)

Investigate and evaluate available COTS solutions

Investigate the adaption of available COTS

Capture and define optical characteristics and parameters

Develop product/development requirements and define the art of the possible

Propose research, technology advancement, and feasibility studies with a keen interest in how to productize the resulting technologies

Design and develop optical components of HMD (waveguide, projector, intervening optics)

Investigate and evaluate available COTS solutions

Investigate adaption of available COTS

Analyze performance of optical components: provide and defend first order (oversimplified) calculations with stated assumptions to recommend whether a technical approach is worth further investigation (for instance in the lab)

Test and characterize the performance of optical components (especially waveguides) in the lab

Evaluate vendor/partner samples

Evaluate prototype designs

Perform competitive comparisons

Debug and resolve any problems with current displays

Serve as lead engineer and SME by understanding the Head-Mounted Display (HMD) marketspace, its requirements, use cases, and customer needs. This includes:

Augmented Reality (AR) Displays

Visual Augmentation Systems (VAS) and Advanced Visual Augmentation Systems (AVAS)

Optical Head-Mounted Displays (OHMD)

Optical See-Through (OST) systems

Computer-generated Imagery (CGI), live imagery, or a combination

Serve as lead engineer and SME by understanding the various technologies, technology trends, emerging technologies, physics and math of optics, and displays fabrication and manufacturing processes.

Serve as lead engineer and SME by understanding and applying the core components and technologies. This includes:

Image generation - graphics and fused sensor data for real-time interaction and situational awareness

Display projection – microdisplays (Micro-LED, OLED, LCoS, or Micro-LED panels)

Optics – lenses, prisms, and waveguides

Motion synchronization – IMUs and cameras to track head movement (low latency)

Develop and maintain a network of contacts at vendors, customers, and industry working groups

Attend and participate as subject matter expert in relevant conferences and symposia

Provide technical support and expertise on proposals, bid efforts and customer interactions

Interact with customers, partners and vendors at a very technical level

Generate Make vs Buy recommendations based on solid analysis and market studies

Manage and influence vendors to successful conclusions, including providing milestones for evaluating next direction, and cutting bait if such evaluation finds no promising direction

Operate without close supervision, which probably means turning an open-ended problem into a course of action and then following it to an actionable conclusion

This means both avoiding rabbit holes and politely avoiding accepting too many assignments or assignments with insufficient time, money, or probability of success

Perform as an integral member of the HMD team interacting on a regular basis with inter/intra-company disciplines including engineering, contracts, programs management, business development, and manufacturing

Some domestic and international travel to vendors, customers, and conferences

By example, set the standards that embody the TDSI Core Value and Thales Leadership Model

Qualifications

The requirements listed below are representative of the knowledge, skill, and/or ability required. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions.

U.S. Citizenship required. - Applicants selected may be subject to a government security investigation and must meet eligibility requirements for access to classified information.

Minimum of Bachelor’s in engineering or equivalent technology field, master’s or PhD preferred

8+ years’ experience in hands on engineering role; with at least 6 dedicated to Optics and Optical Engineering

Proficiency with a variety of optical test and metrology equipment an instruments

Must be hands-on in laboratory

Experience with motion tracking integration into augmented reality devices (expertise preferred)

Excellent organizational skills and work ethic

Knowledge of software development lifecycle

Effective oral and written communication skills and the ability to manage multiple projects

The annualized pay range for this role is $146,151-$186,748 USD along with a target incentive compensation plan (ICP) of 5% . The pay range provided is a good faith estimate representative of the experience level for the role described above. TDSI considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.

For specific questions about this job posting, candidates may contact talent acquisition at careers@thalesdsi.com.

Thales Defense & Security, Inc. is committed to non-discrimination as applicable under federal, state and local laws. We are an E-Verify Employer.

If you need an accommodation or assistance in order to apply for a position with Thales Defense & Security, Inc., please call Human Resources at 240-864-7000.

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