Sr Materials Engineer, Wet Processing; Ingot​/Wafer

Bastrop, TX

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today SpaceX is actively developing the technologies to make this possible, with the ultimate goal of enabling human life on Mars.

Starlink is building the world's largest satellite constellation to deliver fast, reliable internet to people who need it most—and powering that constellation starts on the factory floor. We are in sourcing solar cell manufacturing end-to-end, from crystal growth and ingot production through wafering and cell fabrication, to drive performance, cost, and scale at every step. High-efficiency, high-reliability cells made in-house are the backbone of the Starlink network: more photons in means more data out to customers around the world.

As a Sr. Materials Engineer for wet processing, you will set the technical bar for the chemistry, materials, and surface-quality outcomes of the wet steps that turn silicon ingots into production-ready wafers. That includes degumming, saw-damage etch, wafer cleaning, surface conditioning, chemical recycle/reclaim, and the wet-process chemicals that feed them. You will own the wet-process strategy from path-finding through golden-line and high-volume hand-off;

solve the hardest contamination, etch, and supply-chain problems that stand between us and reliable wafer production at rate; and mentor partner teams on first-principles wet chemistry. If you are passionate about solving hard problems, anchor your engineering judgment with first-principles thinking, and are relentless about acting with urgency, this role is for you.

• Own and drive strategy for wet-process materials and chemistry across silicon ingot and wafer production—degumming, saw-damage etch, cleaning, surface conditioning, and silicon recycle/reclaim—from path-finding and tool/recipe qualification through production-ready baths, specs, and long-term lifecycle management
• Lead cross-functional efforts with process, equipment, quality, production, supply chain, and water treatment to source, qualify, and dual-source critical wet chemicals and consumables that reduce risk and support aggressive scale and cost targets
• Define and own chemical requirements, bath recipes, concentration windows, lifetime limits, and acceptance criteria; ensure they accurately reflect process needs, contamination budgets, quality standards, and manufacturability at rate
• Architect and execute rigorous wet-process qualification programs—including characterization, process trials, reliability assessment, and production-readiness reviews—then drive clean hand-off into manufacturing
• Serve as the primary technical escalation for wet-process, contamination, and surface-quality issues; lead root cause investigations to first principles and implement durable, data-driven corrective actions with urgency
• Apply deep materials and surface-chemistry fundamentals (etch kinetics, oxide/HF chemistry, metal gettering and contamination, particle adhesion, bath aging) to anticipate failure modes, guide selection, and unlock performance or cost gains
• Identify and champion path-finding opportunities—alternative chemistries, new suppliers, bath-life extension, recycle/reclaim, or process changes—that deliver measurable improvements in wafer quality, cell efficiency, yield, uptime, and cost, while remaining compatible with UPW and closed-loop/ZLD wastewater constraints
• Stand up wet-process and wet-lab capability at a high technical bar; own bath monitoring strategy, filtration and chemical-delivery requirements, data integrity, and SPC so results can be trusted for process decisions
• Mentor peers and partner teams on wet-process problem solving,…