Top Principal Engineer Jobs in Boston, MA

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.

Serve as a global SME for Industrial Metaverse technologies (PLCs, IoT, cloud/edge, digital twins, AI, EMC/RED, cybersecurity). Lead standards work, develop test programs, perform and supervise complex testing, train staff, represent UL externally, and support clients and continuous improvement across regional or global labs.

Lead design and implementation of scalable, cloud-native, event-driven microservices on AWS. Decompose monoliths, optimize relational/NoSQL data models, improve reliability, performance, and testing, collaborate with product, design, QA, and DevOps, and drive platform architecture and roadmap for a multi-tenant SaaS identity security platform.

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.

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.

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.

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 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.

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.

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.

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 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.

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.

Lead design and implementation of scalable, secure full-stack web applications and core platform modules. Influence architecture, deliver clean well-tested code, mentor engineers, integrate LLM/AI services responsibly, diagnose production issues, and collaborate across product, QA, and platform teams to meet regulatory and quality standards.

Lead development and application of advanced signal processing, detection, classification, and machine learning algorithms for radar and RF sensing/electronic warfare. Engage customers, lead multidisciplinary teams, translate capabilities into requirements, develop prototypes and demonstrations, and support business development and proposals.

The Principal Engineer will lead electronic systems development for atomic clocks, mentor engineers, and collaborate across teams on design execution.

The Principal Engineer - Process will support manufacturing and development of the Chip Scale Atomic Clock, focusing on process optimization, materials analysis, and lean manufacturing methodologies.

Lead development, monitoring, and optimization of wafer fab processes (photo, etch, deposition, diffusion) to improve yield, cycle time, cost, and equipment reliability. Create/update process specs, qualify new equipment, apply SPC/DoE and Six Sigma, analyze data (Excel/JMP), present results, and lead cross-functional teams to resolve production issues.

The Security Engineering Manager oversees IT security policies, manages incident response, tracks threats, engages with IT teams, and provides regular incident reporting.