Lead Optical Systems Engineer

eXalt; Paris (TX); On-site; USD 150,000 - 190,000; Full time

Job summary

eXalt seeks a Lead Optical Systems Engineer to own the optical discipline across products, guiding architecture, design, and validation from modelling through to hardware integration.

You will lead trade-offs with mechanical, thermal and electrical constraints, mentor engineers, and ensure robust documentation and metrology for repeatable results in demanding environments.

Qualifications

• Advanced degree in optics or related field.
• Experience designing, analysing, integrating and validating complex optical systems.
• Proficiency with Zemax, FRED or Code V and Python scripting.

Responsibilities

• Participate in system-level analyses and architecture trade-offs across optical subsystems.
• Design optical trains and complete prescriptions for manufacturing or procurement.
• Build and run optical models to assess image quality and radiometry.
• Develop and maintain analytical models to validate simulations and help drive design decisions.
• Define and defend optical error budgets during design reviews.
• Lead design-to-hardware transitions including assembly, alignment and testing campaigns.
• Specify and procure testing equipment and metrology tools for product validation.
• Mentor engineers and ensure documentation and baseline robustness.

Skills

System architecture

Optical design

Modelling & simulation

Error budgets

Integration & test

Technical leadership

Python scripting

Education

Masters or PhD in Optics/Optical Engineering

Tools

FRED

Zemax OpticStudio

Code V

Job description

Our client is an innovative and fast-growing technology company developing advanced optical communication and photonics-based systems for demanding applications.

As part of its growth and the strengthening of its optical engineering capabilities, we are looking for a Lead Optical Systems Engineer.

Reporting to the R&D and Engineering teams, you will take ownership of the optical discipline across the company’s products. You will work across the full development lifecycle of optical systems: from architecture and modelling through to integration, alignment, characterisation and validation on dedicated test benches.

You will join an already structured technical environment, with optical designs, analyses, error budgets and operating test benches under configuration control. Working closely with a Senior Optical Architect, who will act as a technical authority and mentor, you will take operational and technical ownership of the discipline, while ensuring that optical knowledge, methods and best practices are documented and sustained across the organisation.

• System Architecture & Trade-offs: Participate in system-level analyses and architecture trade-offs, including link and radiometric budgets, requirements flow-down to optical subsystems, and arbitration between optical, mechanical, thermal, electrical, mass and cost constraints.

• Optical Design: Design optical trains and produce complete optical prescriptions suitable for manufacturing or procurement, including materials, coatings, tolerances, expected performance and acceptance criteria.

• Modelling & Simulation: Build and run optical models using ray-tracing software to assess image and beam quality, transmission, efficiency, stray light, polarisation and tolerance sensitivity.

• First-Principles Modelling: Develop and maintain analytical models to validate numerical simulations, covering beam propagation, diffraction, optical coupling, radiometry and optical-link performance.

• Optical Error Budgets: Define, maintain and defend optical error budgets during design reviews, ensuring consistency between predicted performance, available margins and measured results.

• Integration & Test: Lead the transition from design to hardware, including component and supplier selection, definition of assembly and alignment procedures, and follow-up of Assembly, Integration & Test (AIT) and characterisation campaigns.

• Optical Ground Support Equipment: Define, specify and procure the optical ground support equipment, test benches and metrology tools required to demonstrate product compliance, as well as the associated test strategy.

• Model-to-Test Correlation: Compare predicted and measured performance, analyse discrepancies, identify root causes and feed findings back into optical models and error budgets.

• Supplier Management: Lead technical interactions with optics manufacturers, coating suppliers, integration partners and laboratories, including specifications, RFQs, design reviews, acceptance criteria and incoming inspection.

• Technical Leadership: Help develop the company’s optical capability by mentoring engineers and interns, formalising methods and ensuring the technical documentation and optical baseline remain robust, traceable and transferable.

Education: Master’s degree, Engineering degree or PhD in Optics, Photonics, Physics, Optical Engineering or a related discipline.Professional Background: Significant experience in the design, analysis, integration and validation of complex optical systems. You have ideally delivered an optical system end to end—from design and modelling through to manufactured hardware, alignment and testing.Technical Expertise:Strong command of at least one professional optical design and analysis software package:FRED,Zemax OpticStudio,Code V or equivalent.Solid grounding in geometrical and physical optics, including beam propagation, diffraction, coupling, radiometry and polarisation.Experience in non-sequential modelling, stray-light analysis, Monte Carlo tolerancing and the definition of realistic compensators.Experience in optical prescription writing, thin-film and coating specification, as well as manufacturing tolerances.Programming and scripted-analysis skills, particularly inPython; familiarity with Mathematica is a plus.Good command of optical metrology techniques, including interferometry, wavefront sensing, autocollimation, beam profiling, power measurement and spectral measurement.System Engineering Mindset: You are comfortable building and owning error budgets, justifying requirements and making technical trade-offs at the interface of optics, mechanics, thermal engineering, electronics and industrial constraints.Relevant Industry Experience: Experience in space systems, precision instrumentation, photonics, optical communications, defence electro-optics or similarly demanding environments would be highly valued.Mindset: You are motivated by technical ownership and able to lead a discipline, challenge technical decisions constructively and make sound engineering judgements. You are equally comfortable developing models and working hands-on in the lab, translating measurement results into engineering decisions.English: Professional working proficiency in English, with the ability to write technical documentation and communicate effectively with international suppliers and partners.