Top Principal Engineer Jobs in Boston, MA

Lead hands-on development of scalable full-stack web applications and core platform services for a clinical data and analytics platform. Influence architecture, engineering standards, security, reliability, and maintainability; mentor engineers; resolve distributed-system production issues; and collaborate across product and QA. Integrate LLMs, AI-assisted workflows, and agentic patterns into secure .NET and Python enterprise systems while supporting documentation, compliance, and the full software development lifecycle.

Provide technical direction for GitLab Dedicated, a managed single-tenant SaaS platform. Lead architecture and transformation across resilience, failover, tenant orchestration, change management, automation, and platform integrations. Identify systemic reliability and scalability risks, establish reusable platform patterns, strengthen service ownership, and guide cross-team technical decisions. Mentor senior engineers and advance engineering excellence across the organization.

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 the architecture, design, development, integration, testing, and deployment of advanced radar systems. Research RF sensing approaches, translate customer needs into system concepts, define requirements and architectures, conduct simulations and performance analysis, and guide multidisciplinary teams across software, hardware, integration, and test. The role also involves customer briefings, technical reviews, modeling in Cameo, verification planning, and technical leadership of advanced development projects.

Lead long-term strategy and architecture for cloud and on‑prem platform infrastructure, driving Kubernetes and multi‑cloud reliability, IaC/GitOps automation, observability, SLO/SLI/error‑budget practices, incident leadership, AI‑augmented tooling adoption, and mentorship of senior engineers to improve platform resilience and developer experience.

Leads enterprise platform engineering and AI enablement by building secure, scalable AWS platforms, internal developer services, automation, CI/CD standards, infrastructure-as-code practices, monitoring, reliability controls, and governance. Partners with architecture, security, infrastructure, data, and delivery teams to operationalize AI, machine learning, analytics, and generative AI workloads. Advises senior leadership, drives technical initiatives, improves developer productivity, mentors engineers, and supports regulated-industry compliance.

Provides department-wide technical direction for k0rdent across Kubernetes, AI infrastructure, AI applications, and observability. Designs cross-cutting systems, establishes engineering standards, resolves architectural risks, mentors Staff and Principal engineers, and aligns product strategy with durable technical execution. The role also engages customers, partners, upstream communities, and industry forums while contributing code and prototypes to solve complex infrastructure problems.

Provides technical leadership for a platform initiative by defining architecture, scalability, and long-term engineering strategy. Designs APIs, data pipelines, integrations, and distributed services; leads complex initiatives; manages dependencies and cross-functional execution; improves reliability, observability, and operational efficiency; evaluates technical risks and emerging technologies; and influences product roadmaps and technical direction across teams.

Lead the architectural evolution from monolithic applications to distributed systems. Define service boundaries, establish architectural standards, shape technical roadmaps, and ensure platform scalability, resilience, and maintainability. Collaborate across engineering teams, solve complex technical challenges, mentor engineers, and influence organizational direction through high-impact architectural decisions.

Develop low-level, high-performance instrumentation within CICS and z/OS using HLASM. Design production features for mission-critical mainframe environments, diagnose complex system behavior through dumps and traces, analyze performance bottlenecks, and collaborate with an experienced engineering team. The role requires deep z/OS and CICS internals expertise, systems programming knowledge, and proficiency with JCL, SDSF, and USS.

Leads discrete semiconductor product design, characterization, qualification, yield and quality improvement, cost reduction, and customer-facing engineering. Collaborates with foundry, test, manufacturing, QA, suppliers, and subcontractors to qualify materials and packages. Supports new and existing products, documentation, BOM development, military-standard compliance, failure analysis, and custom engineering. Mentors less experienced engineers and supports marketing and planning teams.

Develops novel sensor technologies and detection methods for next-generation diagnostic and point-of-care medical devices. Responsibilities include planning and conducting laboratory experiments, applying scientific methods, analyzing data, documenting results, collaborating with multidisciplinary teams, and guiding junior personnel. The role requires expertise in sensor technology, electrochemistry, engineering, chemistry, microfluidics, lab-on-a-chip systems, and biomedical applications, with occasional domestic and international travel.

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.

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.

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.

Owns resilience, performance, scalability, and operational cost improvements for a cloud-native platform. Designs and delivers full-stack solutions, builds monitoring and analysis capabilities, performs architectural and code reviews, and resolves complex production issues. The role requires pragmatic modernization judgment, AI-assisted development experience, customer or user accountability, and participation in a weekend on-call rotation.

Leads the architecture, design, and implementation of Vertica’s core database engine. Drives innovations across query optimization, distributed execution, storage, concurrency, scalability, and performance using C++. Defines long-term technical strategy, architects complex distributed database features, guides testing, collaborates with customers and cross-functional teams, mentors engineers, and influences product roadmaps. Requires deep database internals expertise, large-scale systems experience, and strong technical leadership.

Designs and leads large-scale software subsystems, architecture, coding standards, code reviews, debugging tools, performance optimization, refactoring, and QA automation. Guides business and technical solution definition, evaluates production readiness using objective metrics, and develops web content management, workflow automation, integrations, and database solutions. The role is telecommuting eligible throughout the United States.

Leads architecture, technical direction, and hands-on development of robotic manipulation software. Develops motion planning, kinematics, control, multi-arm coordination, simulation, hardware integration, and distributed-system interfaces. Oversees testing, deployment, production support, troubleshooting, design reviews, and engineering standards while mentoring engineers and coordinating with multidisciplinary teams.

Provides technical leadership for Bluehost’s large-scale hosting platform. Sets architecture standards, designs Python and MySQL backend systems on Linux, modernizes Perl and cPanel integrations, and drives reliability engineering practices. Leads complex incident root-cause analysis, establishes AI-augmented delivery standards, mentors senior engineers, and shapes multi-quarter technical roadmaps across the organization.

Leads new product introduction manufacturing for complex FDA- and ISO-regulated electromechanical medical equipment. Oversees design transfer, manufacturing readiness, DFM/DFA, process development, validation, tooling, automation, testing, troubleshooting, and commercialization. Coordinates cross-functional engineering, quality, regulatory, supply chain, and manufacturing teams; establishes process metrics; and provides technical leadership and mentorship without direct people-management responsibility.

Own the architecture, product direction, and hands-on development of Phoenix’s payments infrastructure across processors, gateways, vaults, tokenization, wallets, routing, authorization, disputes, fraud, reconciliation, and reliability. Lead merchant and processor integrations, improve approval rates, manage payment-method portability, maintain PCI-compliant systems, and own incident response. The role combines principal engineering with payments product ownership, requiring direct customer engagement, roadmap decisions, technical design, coding, and accountability for business outcomes.

Lead performance and reliability initiatives across Sonos embedded player APIs and control components. Design architectural improvements, optimize player-to-app and player-to-cloud communication, analyze telemetry, and resolve complex multithreaded system issues. Collaborate with App, Cloud, Security, Data, UX, PM, and QA teams while mentoring engineers, participating in the full software development lifecycle, and presenting technical proposals to leadership.

Lead development and operation of a scalable Kubernetes-based cloud-native platform. Shape the engineering roadmap, deliver enterprise platform capabilities, establish best practices, mentor engineers, and collaborate across Agile teams. Build highly available and fault-tolerant production services using Kubernetes and cloud-native technologies, while applying expertise in Go, Python or Bash, networking, Linux, and CI/CD practices.

Build scalable AI capabilities for Fidelity Wealth, partnering with business, product, architecture, data, and platform teams. Develop secure, reliable, production-ready solutions; apply modern software architecture, cloud platforms, testing, and design patterns; lead technical discussions; mentor engineers; and deliver end-to-end full-stack systems.