Top Principal Engineer Jobs in Boston, MA

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.

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 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.

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.

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 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.

Design, build, and evolve cloud-based platform software for personal lines insurance. Lead development using AWS, C#/.NET, Kafka, containers and Kubernetes, implement CI/CD with GitHub Actions, ensure observability and testing, mentor engineers, write technical documentation, and drive continual performance and quality improvements in an agile environment.

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.

Lead design, configuration, testing, and support of SAP PaPM solutions for Record-to-Report. Translate business requirements into functional/technical specs, build complex financial models/allocations, optimize processes, troubleshoot production issues, mentor junior staff, and support implementation, testing, and post-production transition activities.

Lead technical design and implementation of front-office risk systems and small-scale applications. Build data-rich, AI-enabled workflows, analytics, visualizations, and decision-ready reports while collaborating with risk analysts and investment teams. Serve as a hands-on architect and individual contributor to deliver robust, scalable tools for multi-asset risk analysis.

Design and build production-grade applications, tooling, and data pipelines to support portfolio construction, asset allocation analytics, and quantitative research. Convert AI prototypes into robust full‑stack solutions, contribute to shared quantitative libraries, and maintain dashboards and production systems to support investment decision‑making.

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 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.

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.

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.

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 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.

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

Lead system architecture and engineering for advanced audio products, collaborating across teams to define technical strategies and ensure successful product development.

Lead design and build of an AWS-only AI Operations platform: hosting, IaC, registries (Accountability, Agent, Tool), identity/authorization patterns, developer DX, observability, and security hooks for agentic systems. Evangelize internally and partner on compliance and security integrations.