Top Principal Engineer Jobs in Boston, MA

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.

Define and drive the multi-year roadmap for audit logging, SIEM integration, and unified security visibility. Architect high-throughput, fault-tolerant Go/gRPC pipelines (Kafka/Flink), build customer-facing security dashboards and integrations, ensure compliance-grade immutable logs, set org-wide logging and observability standards, partner across platform teams, and mentor senior engineers while authoring RFCs.

Lead Klaviyo's infrastructure security architecture and programs: IAM, secrets management, network segmentation, vulnerability management, and security tooling. Build IaC guardrails, define security SLOs and compliance posture, run threat modeling and design reviews, embed controls into CI/CD and observability, and deliver code/automation while mentoring senior engineers. Drive AI-enabled security automation and audit readiness for SOC 2/ISO 27001.

Lead design and delivery of Klaviyo's scalable data platform (streaming, batch, lakehouse, governance). Define SLOs, author ADRs/RFCs, implement ingestion/CDC, processing, storage, catalog/lineage and access controls. Optimize performance/cost, apply ML/GenAI to data workflows, partner with product/analytics, contribute code/reviews, and mentor senior engineers to enable reliable, multi‑tenant data at scale.

Lead architecture, build, and operate customer-facing analytics platform: design ELT and metric governance, implement low-latency serving (OLAP), ensure reliability/performance, mentor engineers, partner with product, and use AI coding tools to accelerate development.

As a Principal Engineer for Core Infrastructure at Klaviyo, you will architect and enhance the Kubernetes platform and CI/CD pipelines, improve developer velocity, and ensure operational excellence while incorporating AI tools for automation and incident response.

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.

Lead design and prototype of generative AI experiences to accelerate autonomy development; drive UX for Hivemind Generative AI; collaborate with CTO and Hivemind product leads; conduct user research and competitive analysis; build prototypes and reference implementations that integrate with web and mission-planning systems.

The Principal Engineer will lead the engineering team in building systems across full stack, improving development efficiency, and expanding products in new markets.

Technical leader responsible for architecting and building high-performance POS payment integrations. Drive platform-level technical strategy, develop Kotlin/JVM services, integrate hardware SDKs and EMV card payments, ensure security/key management, observability, and API design, mentor engineers, and collaborate across teams to deliver scalable, mission-critical payment solutions.

Lead the engineering architecture for an AI-driven product, focusing on system design, collaborating with AI agents, and ensuring quality and scalability in large-scale SaaS environments.

Technical lead embedded in the Investment Innovation, Integration & Trading team to design and build prototypes, AI-enabled workflows, and production-ready full-stack applications for fixed income and investment analytics. Partner with analysts to scale proofs-of-concept, deliver reporting and visualization, and ensure robust data pipelines and tooling. Hands-on architecting, rapid iteration, and collaboration across business and engineering to operationalize AI artifacts and maintain high-quality analytics systems.

Lead the architecture, development, and delivery of high-performance audio software platforms, focusing on DSP, embedded systems, and algorithm optimization.

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.

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.

The Senior Kubernetes Engineer will manage and enhance Kubernetes clusters, automate deployments, ensure security, and collaborate with teams to deliver reliable containerized applications.

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.

The Principal Developer Productivity Engineer will enhance GM's developer tools, mentor engineers, and drive system performance through observability and software engineering best practices.

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.

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.

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

Lead architecture and evolution of an enterprise Kubernetes platform across cloud and on-premises. Define platform roadmap, standards, and automation; design multi-cluster/multi-region solutions; implement GitOps, IaC, observability, security, and resiliency practices; mentor engineers and drive cross-functional platform initiatives for reliability, scalability, and developer experience.