Top Principal Engineer Jobs in Chicago, IL

Serve as the senior technical authority for enterprise supply‑chain integrations and agentic AI workflows. Architect and build data pipelines, microservices, APIs, and LLM-powered automation; own POCs to production, define reusable integration standards, support pre-sales, mentor engineers, and drive platform roadmap and customer outcomes across ERP/OMS/WMS/TMS ecosystems.

Design, implement, and deploy safety-critical navigation and state estimation systems for aerospace platforms. Develop EKF and GNSS/INS integration, multi-sensor fusion for GPS-denied environments, FDIR and integrity monitoring, and V&V test plans. Support certification, requirements allocation, performance analysis, flight test evaluation, and provide technical leadership and mentoring.

Lead design and optimization of low-observable aircraft features, perform electromagnetic signature modeling and simulation, direct RCS testing and validation, partner with materials and multidisciplinary teams to mature RAM and coatings, translate threats into survivability features, and support program assessments and milestone decisions.

Lead design and prototyping of generative AI experiences for autonomy development; drive UX for Hivemind products; perform user research, collaborate with CTO and product leads, and deliver reference implementations and integrations across full-stack web and edge systems.

Serve as a global SME for Industrial Metaverse technologies (PLCs, IoT, cloud/edge, digital twins, AI, EMC/RED, cybersecurity). Lead standards work, develop test programs, perform and supervise complex testing, train staff, represent UL externally, and support clients and continuous improvement across regional or global labs.

Develop and maintain certification requirements for gas and vapor detection products; lead standards participation; create training and guidance; handle new/innovative product reviews; initiate certification requirement changes and coordinate with Operations; represent UL Solutions in technical forums and provide subject-matter expertise.

Lead principal for CFD and physics-based simulation focusing on CFD, fire/explosion, refrigerant leakage, battery thermal runaway, combustion, multiphase flows, and electronics cooling. Own V&V strategy and model credibility, enforce ASME/NASA/Oberkampf & Roy best practices, drive test-to-simulation correlation, mentor engineers, produce technical reports for certification, and guide global teams on validated modeling approaches for safety-critical applications.

Lead global digital manufacturing transformation by defining roadmap, architecting analytics and AI solutions, integrating MES/SCADA/PLCs with cloud, developing predictive maintenance and anomaly-detection models, driving OEE and quality improvements, enforcing data governance, and scaling Industry 4.0 capabilities across sites.

Design, build, test, and deploy intelligent automation workflows and cognitive solutions. Optimize processes using RPA, ML/AI integrations, create monitoring/analytics, define standards, mentor junior staff, and manage risks and escalations.

Design, evolve, and optimize Scala-based, low-latency trading services. Lead architecture for scalability and performance, tune JVM/Akka systems, enhance observability, ensure security and regulatory compliance, and mentor junior engineers while collaborating cross-functionally to support 24x7 high-volume trading.

Lead design, develop, and maintain enterprise automated test frameworks for web, mobile, and API. Build and run automated visual regression, integration, and exploratory tests, integrate suites into CI/CD, monitor app metrics in AWS environments, validate CMS workflows, mentor junior QA, and produce test plans and audit-ready documentation to ensure reliability and performance across high-volume systems.

Lead design and delivery of flight-critical power electronics for the X-BAT aircraft, including inverters, DC-DC converters, and battery management. Own full hardware development cycle, drive PCB layout, harden designs for harsh environments, mentor engineers, lead reviews, and manage program timelines through production.

Lead architecture, development, and validation of end-to-end aircraft fuel systems. Drive cross-functional integration, system-level modeling (CFD), verification, supplier qualification, ground and flight test support, anomaly root-cause analysis, and mentor engineering teams while contributing to long-term fuel-system technology roadmaps.

Lead architecture and technical direction for an enterprise API developer platform. Define API design, governance, security, and catalog capabilities; embed AI-powered developer tooling; drive platform engineering practices, observability, CI/CD, and multi-environment delivery across cloud and on-prem gateways; mentor engineers and partner with product, architecture, and program teams to measure and grow platform adoption.

Lead manufacturing systems engineering for IRCM/RFCM product lines: develop manufacturing plans, readiness assessments, automation designs, cost models, and maturity plans; drive digital transformation, capital/NCTA/CRAD planning, and cross-functional producibility solutions to prepare programs for production.

As a Senior Principal Engineer, you'll define and drive the technical strategy for customer experience platforms, lead architectural decisions, and mentor engineering teams to enhance customer and agent experiences.

Lead design, build, deployment, and operation of highly resilient, high-throughput configuration and publishing systems. Define long-term architecture and strategy, mentor senior engineers, diagnose and fix performance bottlenecks, and leverage AI tools to improve engineering productivity and platform capabilities.

Lead PSC (Power/Space/Cooling) capacity planning across a nationwide portfolio while designing AI/automation and data solutions. Perform facility power/DC analysis, produce space-planning deliverables, build LLM-driven bots, ETL pipelines, dashboards, forecasting models, and present executive-level readouts. Mentor teams and drive cross-functional engineering and operational improvements.

Build, operate, and secure cloud-native and edge infrastructure including Kubernetes, artifact pipelines, application streaming, and air-gapped appliances. Partner with product, GRC, and mission owners to design, deploy, and harden systems, remediate vulnerabilities, support audits (IL5/IL6/JWICS), and ensure trusted artifact delivery across environments.

Lead supplier quality activities for aerospace electronic warfare programs: perform supplier audits, first article inspections, root-cause investigations, manage SCARs/SDRs, assess manufacturing readiness (DoD MRL), and drive supplier performance improvements while supporting junior engineers and traveling to suppliers (up to 25%).

Lead development of manufacturing test software for RF production hardware, from requirements through validation. Collaborate with design, test, QA, and production to create and maintain test stations, procedures, and continuous improvement initiatives. Troubleshoot hardware/software/firmware issues and support environmental screening and acceptance testing for military-grade electronic warfare systems.

Lead mechanical engineer for ruggedized electronic equipment development for military applications. Responsible for design, thermal/structural/microelectronics/opto-mechanical analysis, manufacture and environmental test, managing schedule and budget, leading engineering teams, stakeholder communication, and mentoring/knowledge transfer.

Lead development and maintenance of manufacturing test software for RF production hardware, from requirements through validation. Collaborate with design, test hardware, QA and manufacturing to develop test procedures, fixtures and stations; troubleshoot hardware/software/firmware; support production acceptance and environmental screening; drive continuous improvement and testability reviews.

Lead development and validation of RF test stations, support production troubleshooting and calibration, drive design-for-manufacturability and continuous improvement, coordinate cross-functional teams, and manage test engineering projects and reporting for EOIR products.

Lead process development and continuous improvement for opto-mechanical EOIR assembly. Create manufacturing work instructions, tooling/fixtures, support production, recommend design-for-manufacturability changes, manage projects, and present executive-level status. Coordinate across engineering, production, quality, and program teams.