---
title: 'Assistant Test Engineer - Optical Manufacturing at Lumilens'
canonical: 'https://feeny.ai/job/assistant-test-engineer-optical-manufacturing-lumilens-chon-buri-6cpsb00m6h5x'
type: 'job'
last_seen: '2026-09-07'
---

# Assistant Test Engineer - Optical Manufacturing at Lumilens

- **Company:** Lumilens
- **Location:** Chon Buri, Thailand
- **Employment:** full-time
- **Posted:** 2026-08-26
- **Last confirmed live:** 2026-09-07
- **Apply:** https://jobs.ashbyhq.com/lumilens/9c81da75-2092-43f3-8e0b-31b2c4ef0ace

## Job description

## ABOUT LUMILENS

At Lumilens we are building the critical photonics infrastructure that powers tomorrow’s AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, Lumilens is unlocking a new era of computing - faster, cooler, and massively more efficient.

We’re a well-funded startup backed by Mayfield and led by veterans who’ve built and scaled some of the most transformative technologies in the industry. At Lumilens, we’re developing high-speed photonics products purpose-built to power the future of AI infrastructure and high-performance computing.

This isn’t incremental innovation, it’s a ground-floor opportunity to rethink the optical layer from the silicon up. You’ll work alongside a team of world-class engineers solving some of the hardest challenges in scaling optical systems. Every line of code, every design decision, every breakthrough you help deliver will shape the infrastructure of tomorrow.

If you're looking for mission, momentum, and the chance to make an outsized impact, jump on the rocket ship. We’re just getting started.

## POSITION OVERVIEW

The Assistant Test Engineer is responsible for performing functional, performance, and reliability testing on optical transceiver products (SFP, SFP+, QSFP, QSFP-DD, OSFP, CFP, etc.) throughout the manufacturing process, ensuring products meet OEM customer specifications and industry standards (MSA, IEEE, ITU, Telcordia) prior to shipment. Working alongside Test Engineering, Quality, and Production, this is a hands-on role at the line and in the lab — running test stations, maintaining fixtures and instrumentation, and turning test data into actionable findings that improve yield and throughput as Lumilens scales its optical interconnect products into high-volume manufacturing.

## DUTIES/RESPONSIBILITIES

- Perform incoming, in-process, and final testing of optical transceivers (e.g., optical power, sensitivity, extinction ratio, wavelength, BER, eye diagram, jitter, TX/RX parametric testing).
- Operate and maintain test equipment such as BERTs, optical power meters, optical spectrum analyzers, oscilloscopes, TEC controllers, and automated test stations.
- Execute test plans and procedures according to OEM customer specifications and MSA (Multi-Source Agreement) standards.
- Log, analyze, and report test data; identify and flag out-of-spec units, and support failure analysis and root cause investigation.
- Calibrate and troubleshoot test fixtures, jigs, and automated test equipment (ATE).
- Support burn-in, environmental (temperature/humidity), and reliability testing (e.g., HTOL, thermal cycling).
- Maintain accurate documentation, test records, and traceability per quality system requirements (ISO 9001 / IATF / TL 9000, as applicable).
- Collaborate with Test Engineering, Quality, and Production teams to improve test yield, throughput, and process efficiency.
- Support new product introduction (NPI) test bring-up and validation for new OEM programs.
- Ensure compliance with ESD, laser safety, and handling procedures for optical and electronic components.
- Assist in developing or refining test scripts/software (Python, LabVIEW, TCL) alongside engineering, as needed.

## SKILLS/EXPERIENCE

- Associate degree or technical diploma in Electronics, Photonics, Engineering Technology, or a related discipline; equivalent practical experience will be considered.
- 2+ years of hands-on experience testing optical transceivers or similar photonic/optoelectronic components in a manufacturing or OEM environment.
- Working knowledge of optical transceiver form factors (SFP/SFP+/SFP28, QSFP/QSFP28/QSFP-DD, OSFP, CFP2/CFP4) and MSA specifications.
- Familiarity with optical and electrical test parameters: optical power, wavelength, extinction ratio, sensitivity, jitter, eye diagrams, and BER.
- Experience operating test instruments: optical power meters, OSAs, BERTs, oscilloscopes, and network analyzers.
- Understanding of fiber optic handling, cleaning, and connector types (LC, MPO/MTP).
- Ability to read and interpret schematics, test procedures, and datasheets.
- Basic data analysis skills (Excel; scripting a plus).
- Strong attention to detail and documentation discipline.

## PREFERRED QUALIFICATIONS

- Experience supporting OEM/ODM customer qualification and PPAP/FA (First Article) processes.
- Familiarity with ISO 9001, TL 9000, or IATF 16949 quality systems.
- Scripting and automation experience (Python, LabVIEW, TCL, Perl).
- Experience with 100G/400G/800G transceiver testing.
- Prior experience in a cleanroom or ESD-controlled manufacturing environment.
- Laser safety training or certification.

## PHYSICAL REQUIREMENTS

- Ability to work in a lab and production environment, including standing for extended periods.
- Ability to handle small precision components and use fine tools.
- Comfortable working near Class 1 laser sources following established safety protocols.

All qualified applicants will receive consideration for employment without regard to race, color, religion, religious creed, sex, national origin, ancestry, age, physical or mental disability, medical condition, genetic information, military and veteran status, marital status, pregnancy, gender, gender expression, gender identity, sexual orientation, or any other characteristic protected by local law, regulation, or ordinance.

## About Lumilens

## Company Overview
- **One-liner**: Lumilens designs and manufactures next-generation photonic interconnects to massively scale AI compute infrastructure.
- **Entity Type**: Private (Series B – led by Accton Technology; prior Series A of $30M from Mayfield and Spark Capital)
- **Headquarters**: San Jose, California, USA
- **Founded**: 2024
- **Founders**: Ankur Singla (CEO), Samuel Liu (VP Products), Ritesh Kapahi (VP/GM India), Dave Friedman (VP Operations)

## Core Business
- **Primary industry**: Photonics / optical interconnects for AI data centers
- **Target customers**: Large-scale AI providers and hyperscale data center operators (B2B, Enterprise)
- **Mission**: “To rapidly innovate in photonics and connectivity architectures to enable the massive scaling of compute infrastructure required to deliver the full potential of AI.”

## Products & Services
- **Photonic Interconnects (Scale-Out & Scale-Up)**: High-density, low-latency optical links that enable cluster-to-cluster and direct GPU-to-GPU connectivity. Supports 100x higher quantity of GPU direct connections than legacy approaches.
  - *Type*: Hardware (silicon photonics modules) + integrated manufacturing
- **Automated Manufacturing Platform**: End-to-end custom robotics and AI-optimized production processes to maximize yield, quality, and supply-chain flexibility.
  - *Type*: Service / Manufacturing capability (in-house)

## Market Standing
- **Valuation/Market Cap**: Not publicly available
- **Key Metric**: Total funding – $30M Series A (June 2024); Series B led by Accton Technology (amount undisclosed)
- **Notable Investors/Partners**: Mayfield, Spark Capital, Accton Technology
- **Growth Signals**:
  - Headcount grew 287% YoY (54 employees as of mid-2025) [linkedin.com]
  - Operations in 8 countries: USA, India, Thailand, Poland, Singapore, Czechia, South Korea, Malaysia
  - 48 active job postings (+23.1% monthly growth) [linkedin.com]
  - Leadership team with deep photonics/networking experience from Cisco, Juniper, Meta, Lumentum, Coherent

## Competitive Advantages
- **In-house silicon photonics development** – full control over design and supply chain
- **Systems-level expertise** – can partner on both scale-out and scale-up architectures
- **Manufacturing automation** – robotics + AI processes enable faster innovation, higher quality, and predictable deployment
- **Standards-based interconnects** – easy deployment into existing infrastructure
- **Manufacturing anywhere** – supply-chain continuity and scalable manufacturing

## Strategic Focus
- Enable massive scaling of AI infrastructure by overcoming electrical/copper limitations with advanced photonics
- Disaggregate GPUs to mitigate power and density challenges in data centers
- Expand manufacturing capacity globally and continue to automate production
- Align product roadmap with industry standards to accelerate adoption

## Why Work Here
- **Culture**: Fast-paced startup environment with deep technical expertise; mission-driven focus on enabling the future of AI
- **Work policy**: In-office (HQ San Jose, CA with Bengaluru, India as major hub) [builtin.com]
- **Perks**: Opportunity to work on cutting-edge photonics, robotics, and AI manufacturing; direct impact on world’s largest AI infrastructure
- **Engineering culture**: Heavy emphasis on silicon photonics, hardware design, robotics automation, and system-level architecture. Teams are led by veterans from Cisco, Juniper, Meta, Lumentum, Coherent.

## Sources
1. [lumilens.com](https://lumilens.com/) – Company overview, mission, leadership, products
2. [lumilens.com/company](https://lumilens.com/company) – Vision, investors, leadership team
3. [builtin.com](https://builtin.com/company/lumilens) – Career page, employee count, year founded, office policy
4. [linkedin.com](https://www.linkedin.com/company/lumilens) – Headcount, funding details, geographic/department breakdown, job trends, talent sources
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/lumilens) – Current job openings (48 listings)

## Other roles at Lumilens

- [Staff Wafer-Level Testing Equipment Engineer](https://feeny.ai/job/staff-wafer-level-testing-equipment-engineer-lumilens-singapore-2p0ya27rda60) — Singapore
- [Sourcing Manager (Foundry & OSAT)](https://feeny.ai/job/sourcing-manager-foundry-osat-lumilens-singapore-26re9q580khj) — Singapore
- [Senior/ Staff NPI Wafer Bumping/Fan-Out Process Engineer](https://feeny.ai/job/senior-staff-npi-wafer-bumping-fan-out-process-engineer-lumilens-singapore-ma0tx35az5eq) — Singapore
- [Staff Wafer-level Testing Engineer (Operations & Process)](https://feeny.ai/job/staff-wafer-level-testing-engineer-operations-process-lumilens-singapore-cvp2fdz9w4qr) — Singapore
- [Optical Transceiver Product Engineer](https://feeny.ai/job/optical-transceiver-product-engineer-lumilens-thailand-f5tgy64vcaxr) — Thailand
- [Product Quality Engineer](https://feeny.ai/job/product-quality-engineer-lumilens-chon-buri-45vb6wx9tam7) — Chon Buri, Thailand
- [Analog Layout Lead](https://feeny.ai/job/analog-layout-lead-lumilens-san-jose-5fmv4e96vhpt) — San Jose, CA
- [IT Specialist](https://feeny.ai/job/it-specialist-lumilens-bengaluru-c85avweewvq3) — Bengaluru, India
- [IT Specialist Intern](https://feeny.ai/job/it-specialist-intern-lumilens-san-jose-psmknddggbz7) — San Jose, CA
- [Senior Staff Software Engineer, Data](https://feeny.ai/job/senior-staff-software-engineer-data-lumilens-san-jose-mxja907kewxx) — San Jose, CA