Top Principal Engineer Jobs in Boston, MA

Lead enterprise-scale AI/ML strategy and architecture, develop novel ML solutions for complex problems, guide organization-wide ML practices and standards, influence technical decisions, and build and lead high-performing cross-functional ML teams to drive innovation and business impact.

The Principal Engineer for Conversational AI will lead engineering teams, design software solutions, and ensure high-quality products in voice and chat bots, while collaborating across functions.

Lead architecture and implementation of AI-powered scientific products end-to-end. Design data models, APIs, deployment, observability, and maintainability. Collaborate with scientists and ML researchers, make high-stakes technical decisions, bridge research and production ML, and occasionally direct embedded contractors while owning technical output and quality.

Design, develop, and maintain software applications and databases for business environments, collaborating with IT and various business units to support investment systems.

Lead design and implementation of RF hardware systems, collaborating with teams on system requirements and hardware designs, while supporting assembly, integration, and testing.

The role involves developing advanced signal processing algorithms, leading projects, engaging with customers, and supporting business development initiatives. Requires deep technical knowledge and leadership in radar and electronic warfare solutions.

Lead design and hands-on development of low-latency, real-time trading and market-data platforms for public markets. Architect event-driven, API-first systems, embed CI/CD, observability, and responsible AI practices, collaborate with product and enterprise teams, and mentor engineers to deliver resilient, cloud-native solutions.

Develop and implement AI validation methodologies, enhance application performance, collaborate with Agile teams, and lead AI testing efforts for healthcare products.

The Principal AI Engineer will design AI-powered workflows, partner with stakeholders, and build production-level systems in a cross-functional environment.

The Principal Front-End Engineer will enhance the Growth team's platform and infrastructure by developing tools, managing applications, and ensuring a high-quality user experience across projects.

As a Principal Security Engineer in Data Security, you will spearhead Upstart's data security program, architect software solutions, partner cross-functionally, and mentor teams while ensuring effective protection of sensitive data.

As a Principal Data Engineer, you will design and implement LLM, AI-powered security data platforms, mentor engineers, and drive the adoption of data solutions across teams.

Lead and build an ML Acceleration team to define strategy and implement scalable solutions to speed ML training. Hands-on role combining technical design (distributed training, hardware and model optimization) with people management, cross-functional collaboration, impact measurement, and continuous performance improvements for production autonomous vehicle ML systems.

Lead security architecture and threat modeling for the DNSid platform. Design cryptographic core, build secure SDKs (TypeScript, Go, Python), enforce supply-chain and deployment security, partner on standards (IETF), and own org-wide security posture including secrets management, SOC 2 readiness, and incident response.

Design, implement, and standardize robotics control solutions (PLC/HMI/SCADA/motion) for GMP manufacturing, lead FAT/SAT/commissioning, support validation and integration with IIoT/digital systems, manage vendors and projects, mentor staff, and ensure compliance with GxP/GAMP and data integrity. Travel up to 25% to support global project execution.

The role involves designing and enhancing database engine components, optimizing algorithms, and maintaining programming language support, requiring extensive experience in low-level system code development.

The Principal Engineer will lead Babel Street's API and MCP platform strategy, designing agent-ready APIs and managing cross-team technical initiatives, ensuring the API-first platform is optimized for AI interactions and developer usability.

Lead the development of software for handheld imaging devices, focusing on UI/UX, data processing, and AI/ML integration in a multidisciplinary team.

The Principal SDET will lead automation framework development, mentor teams, drive migration to modern testing solutions, and collaborate across engineering teams to enhance quality and efficiency.

As a Principal Software Engineer, you will mentor junior engineers, solve technical problems, and enhance customer-focused software solutions in an agile environment.

The Principal Front-Office Engineer designs and implements applications to enhance risk analysis and reporting, working closely with risk teams. The role focuses on building robust systems and tools in a fast-paced investment environment, leveraging software engineering skills and financial knowledge.

The position involves reversing complex software/firmware, developing cybersecurity solutions, leading technical teams, and conducting vulnerability research, all while ensuring national security.

The Principal Engineer will lead the technical roadmap for Upstart's GenAI platform, focusing on LLM infrastructure and system architecture while collaborating with various teams to ensure successful AI integration and operational standards.

The Principal Radar Systems Engineer leads radar system development, collaborates with multi-disciplinary teams, and ensures effective solutions to customer needs while applying systems engineering principles.

The Principal SAP PaPM Configuration Engineer analyzes and configures use cases, supports production users, and mentors team members to enhance SAP PaPM systems within the finance environment.