Top Principal Engineer Jobs in Boston, MA

Lead architecture and technical execution for Toast’s Payroll and Team Management products. Own authentication, authorization, and organizational hierarchy across a multi-tenant SaaS platform. Drive high-scale, full-stack initiatives, modern agentic development practices, integrations, technical strategy, quality standards, deployment practices, and cross-functional collaboration. Mentor engineers across teams and leverage AI tools and LLM integration to improve software development velocity and quality.

The Principal Model-Based Systems Engineer will lead development programs using MBSE approaches, mentor teams, and implement digital engineering goals, focusing on DoD systems.

Lead multidisciplinary teams to design, develop, and transition advanced RF sensing and electronic warfare algorithms from concept to prototype. Architect signal processing, detection/classification, waveform and adaptive processing solutions, engage customers, mentor researchers, support proposals and business development, and verify system performance through modeling, simulation, and testing.

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 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 the design and delivery of core platform capabilities, focusing on scalable systems, AI application, and mentoring engineers while driving architectural decisions and improving operational systems.

Lead development, integration, and qualification of semiconductor processes; drive yield, defect reduction, and cost optimization using DOE/SPC and data analytics; enable NPI transition to high-volume manufacturing; lead failure analysis and reliability efforts; collaborate with design, manufacturing, and foundry partners and mentor engineering staff.

Leads the design, development, optimization, characterization, and scale-up of advanced immersion-cast membranes for semiconductor filtration. Develops membrane materials and NIPS processes, conducts laboratory, pilot, and manufacturing trials, troubleshoots process and equipment issues, documents technical findings, and drives intellectual property generation. The role collaborates with R&D, manufacturing, operations, procurement, marketing, quality, and product management to support commercialization, product launches, customer discussions, and safe laboratory operations.

This role involves designing and developing core modules for an enterprise-level clinical data platform, ensuring compliance with quality standards, and collaborating with teams for software development and testing.

Technical lead embedded with investment teams to design, prototype, and productionize AI-enabled full‑stack applications for fixed income and investment analytics. Build scalable systems, partner with analysts, write robust Python code, develop front-end visualizations, and integrate Bloomberg/financial data into production workflows.

Technical lead embedded with Investment Strategy & Capital Management to design and build full‑stack applications, productionize AI prototypes, enhance analytics and reporting, and partner with investment teams. Hands‑on architecting, iterating, and scaling data‑rich systems using Python and SQL in a hybrid Boston environment.

Lead architecture, design, and delivery of PET product features; write production full‑stack code; champion testing, observability, CI/CD and operational readiness; mentor engineers and collaborate with product to shape technical roadmap.

Design and develop massively parallel distributed database kernels for real-time analytics at terabyte and petabyte scale. Responsibilities include low-level C++ development, MPP query execution, SIMD and hardware optimization, distributed communication using MPI and RDMA technologies, database internals, vector indexing, in-database machine learning, performance tuning, architecture reviews, mentoring, and resolving scalability issues.

Lead high-leverage technical work across teams: define architecture and patterns, drive end-to-end delivery and operational excellence, ship AI-enabled systems, mentor engineers, set AI guardrails, and represent technical leadership internally and externally.

Lead the architecture and operation of Yahoo’s enterprise developer experience platform, including CI/CD, artifact management, GitOps deployments, and developer tooling. Design production agentic AI automation with evaluation frameworks, correctness checks, and security guardrails. Establish standardized workflows, templates, and CI practices; improve developer productivity through AI-assisted engineering and self-service portals. Partner with security and compliance teams, provide technical leadership, guide architecture reviews, mentor engineers, and measure platform adoption and reliability.

The Principal Engineer will shape the technical strategy for messaging infrastructure, influence architectural decisions across teams, and solve complex technical problems. Responsibilities include mentoring engineers, driving coherence across teams, and leading initiatives to ensure Weave's competitiveness in messaging solutions.

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.

Lead the technical direction for integrating algorithms on the Prism Mapping platform, focusing on real-time signal pipelines and optimization strategies. Collaborate with teams to ensure robust clinical performance and timely delivery of new capabilities.

Lead the technical direction and architecture for the core infrastructure of the Prism Mapping platform, ensuring reliability and performance in a medical device environment. Mentor engineers and drive technical improvements while communicating complex decisions to stakeholders.

The Principal Software Engineer will lead and develop high-performance software for the Opal Mapping system while serving as a Scrum Master to facilitate agile processes.

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 architectural design for real-time 3D visualization on the Prism Mapping platform, mentor engineers, and define the long-term visualization roadmap.

Lead the UI architecture for the Prism Mapping application, drive design and delivery of major subsystems, mentor engineers, and shape technical direction in a clinical environment.

Lead the architecture and evolution of managed Kubernetes and cloud-native services. Provide cross-team technical oversight, standardize platform practices, integrate open-source technologies, improve scale, performance, security, and operational efficiency, and mentor engineering teams. The role requires expertise in Kubernetes-based platforms, container runtimes, cloud-native architectures, and Go, Python, or Bash.