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.

Lead technical design and hands-on development of low-latency, event-driven trading and market data platforms. Drive architecture, engineering standards, CI/CD, observability, and AI-assisted tooling; collaborate with product and solution teams; mentor engineers; ensure resilient, secure, cloud-native solutions aligned with enterprise strategy.

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

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 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.

No specific responsibilities listed. Senior technical leadership role to develop and direct hedge fund and analytics technology platforms, collaborate with investment stakeholders, design and implement analytics systems, and mentor engineering staff.

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.

The Principal Engineer will lead enterprise scalability efforts, driving architectural changes, optimizing systems, and integrating AI for improved operational performance across multi-tenant SaaS platforms.

Develop and maintain thermodynamic and transport property modeling software for AspenTech products. Design algorithms (flash, regression, estimation), research new technologies, provide technical leadership, and collaborate with product teams to translate customer needs into robust application solutions.