Principal Engineer

Job Description: Principal Full Stack Engineer – OpenBlue Role Overview Johnson Controls’ OpenBlue platform is transforming the built environment through smart, connected, AI-driven systems. We are looking for a Principal Full Stack Engineer to play a key technical leadership role in designing and scaling OpenBlue’s next-generation digital products. This role will define architecture and engineering best practices for cloud-native, IoT-enabled, data-intensive, and AI-driven applications used across buildings, campuses, and enterprise ecosystems. As a Principal Engineer, you will work across multiple product teams, partnering closely with architects, platform teams, and engineering leaders to drive innovation, reliability, and performance across the OpenBlue technology stack. Key Responsibilities Platform & Architecture Leadership - Lead architecture and design of scalable, secure, and resilient solutions across the OpenBlue ecosystem—including IoT data ingestion pipelines, digital twin systems, and smart-building applications. - Define and guide modernization initiatives: microservices, event-driven architecture, API unification, observability, and data platform integrations. - Collaborate with Enterprise Architecture to align product design with OpenBlue platform strategy and reference architectures. Full Stack Engineering Excellence - Provide hands-on expertise across the entire stack: frontend UIs, backend microservices, cloud-native solutions. - Influence design and implementation of core capabilities such as identity, tenant management, configuration services, and data interoperability. IoT, Digital Twin & Data Systems - Work with teams building digital twins, telemetry processing, device management, and rules engines. - Shape engineering patterns for device-to-cloud and cloud-to-edge communications. - Guide integration between OpenBlue cloud services and hardware/controls products. Mentorship & Cross-Functional Collaboration - Mentor senior engineers and elevate technical decision-making across squads. - Partner with Product, UX, Data Science, and DevOps to drive customer-centric outcomes. Quality, Security & Operational Excellence - Champion secure coding practices and compliance frameworks. - Strengthen CI/CD, automation, observability, and incident response maturity. Required Qualifications - 12+ years of software engineering experience with full stack expertise. - Proven Principal/Staff Engineer experience in distributed systems. - Strong proficiency in React/Angular and Java/.NET/Node.js/Python. - Expertise in Azure cloud-native architectures. - Strong knowledge of IoT, messaging, microservices, and data systems. Preferred Qualifications - Experience with smart-building technologies, IoT platforms, or industrial systems. - Knowledge of Azure IoT Hub, Digital Twins, Cosmos DB, Event Hub. - Experience in telemetry, analytics pipelines, or AI-driven systems. - Familiarity with multi-tenant SaaS development. What We Offer - Opportunity to shape the future of smart buildings. - High-impact technical leadership role. - Culture of innovation and continuous learning. - Competitive compensation and global opportunities. Johnson Controls: Enhancing the Intelligence of Buildings Your buildings have a purpose. They are places for people to live or work. Facilities for learning or healing. Venues for entertainment and shopping. Sites for the specialized storage of tangible goods or mission-critical data. Your buildings have a huge variety of functions; they are central to your mission. This is where Johnson Controls comes in, helping drive the outcomes that matter most. Through a full range of systems and digital solutions, we make your buildings smarter. A smarter building is safer, more comfortable, more efficient, and, ultimately, more sustainable. Most important, smarter buildings let you focus more intensely on your unique mission. Better for your people. Better for your bottom line. Better for the planet. At Johnson Controls, we’ve been making buildings smarter since 1885, and our capabilities, depth of innovation experience, and global reach have been growing ever since. Today, we offer the world’s largest portfolio of building products, technologies, software, and services; we put that portfolio to work to transform the environments where people live, work, learn and play.