Top Principal Engineer Jobs in Boston, MA

Designs and develops innovative spatial computing, extended reality, and AI experiences for Fidelity’s innovation center. Responsibilities include rapidly prototyping applications, collaborating with design and product teams, building APIs and cloud-based systems, integrating hardware, supporting live interactive environments, and evaluating emerging technologies. The role requires expertise with immersive development platforms, databases, AWS, real-time graphics, and troubleshooting interactive experiences.

Provides principal-level systems engineering support for the Department of the Air Force Battle Network across acquisition, architecture, requirements, integration, risk mitigation, testing, and sustainment. Translates mission requirements into technical solutions, develops enterprise and multi-domain architectures, evaluates ICAM capabilities, supports cloud and DevSecOps initiatives, and prepares technical documentation and executive briefings. The role is fully onsite at Hanscom AFB and requires extensive Department of War and systems engineering experience.

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.

Leads automation engineering for a regulated medical-device manufacturing site. Responsibilities include developing automation roadmaps, supporting and troubleshooting automated equipment, leading machine vision and robotics initiatives, qualifying and validating equipment, implementing corrective actions, improving reliability, and deploying emerging technologies. Partners with cross-functional and regional teams to execute automation projects and ensure compliance with quality, safety, validation, and regulatory requirements. The role is onsite in Danvers, Massachusetts, with 10–15% travel.

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.

Leads end-to-end electrical design for robotic material-handling systems, including architecture, schematics, PCB layout, harnesses, power distribution, integration, testing, EMC/EMI validation, and production release. Owns designs through manufacturing ramp, collaborates with contract manufacturers and cross-functional teams, investigates field failures, supports customer and test-site bring-up, and mentors electrical designers while driving process and technical quality.

Architects and standardizes laboratory automation deployments, including robotic systems, orchestration software, LIMS, ELN, and third-party integrations. Defines commissioning standards, acceptance criteria, integration patterns, and testing methods; leads new product introduction and resolves complex technical escalations. The role mentors engineers, develops training and documentation, partners cross-functionally, and selectively supports high-risk customer deployments. Requires extensive laboratory automation experience, object-oriented programming, robotic arm integration, and travel up to 20%.

Provides principal-level engineering support for Air Force network and communications systems. Responsibilities include planning, designing, integrating, testing, operating, and maintaining wired, wireless, and Private 5G infrastructure. The role supports RF, 5G Core, gNodeB, network architecture, switching, routing, NAC interoperability, capacity and performance monitoring, backup and recovery, operating system maintenance, and cybersecurity policy implementation in a DoD environment.

Principal Frontend Engineer responsible for defining and governing large-scale frontend architecture across clinical applications. Leads modernization from fragmented systems to a React-based platform using JavaScript, TypeScript, Node.js, GraphQL, and shared component standards. Drives migration strategy, technical governance, performance improvements, AI-assisted development tooling, and cross-team alignment while mentoring engineers. Advises on CI/CD, AWS infrastructure, Oracle integrations, legacy Perl utilities, security, hiring, and long-term workforce planning.

Designs, develops, and optimizes embedded firmware for microcontroller-based motion control systems. Responsibilities include bare-metal and RTOS development, motor and sensor interfaces, low-level drivers, hardware bring-up, board-level debugging, peripheral integration, performance optimization, documentation, design reviews, and mentoring junior engineers.

Leads electrical engineering projects from concept through production, designing PWM amplifiers, power converters, power supplies, and embedded hardware/software. Develops microprocessor and FPGA solutions, performs circuit simulation and validation, oversees PCB design, and tests prototypes using laboratory equipment. Ensures manufacturability, reliability, and performance while collaborating with cross-functional engineering teams.

Leads architecture, technology strategy, and execution for FMI’s CRM and Ordering Management transformation. The role directs migration from Microsoft Dynamics 365 to Salesforce, defines transition and future-state architectures, oversees integrations, data migration, governance, security, and platform roadmaps, and establishes modern engineering practices. It also mentors engineering teams, drives DevSecOps, CI/CD, automated testing, AI-assisted development, and reliable delivery across enterprise platforms including LIMS, billing, and medical reporting systems.

Work with customers and cross-functional teams to design, build, and deliver cloud-based solutions. Lead design, identify dependencies, mentor engineers, act as DRI and on-call, and improve availability, reliability, observability, and performance. Contribute to open-source assets and collaborate with Microsoft product teams to produce extensible, maintainable code and scalable solution patterns.

Lead engineering for a hyperscale deployment platform serving Microsoft 365 services. Design and deliver scalable deployment features across the full software lifecycle, mentor engineers, and drive automation and AI-powered solutions that improve reliability, efficiency, performance, and operational excellence. Collaborate with product managers and partner teams while ensuring high-quality, maintainable, production-grade software.

Leads the strategy, architecture, and operation of Kubernetes-based cloud and on-premise infrastructure. Drives reliability engineering, Infrastructure as Code, GitOps, observability, automation, incident response, capacity planning, and cost optimization. Leads cross-functional platform initiatives, establishes SLOs and error budgets, mentors engineers, and advances AI-enabled engineering practices across the organization.

Own the architecture, implementation, and operational excellence of major Azure Boost DPU software components. Develop low-level systems software spanning operating systems, virtualization, networking, storage, device management, and hardware interfaces. Lead complex cross-functional initiatives, optimize hyperscale performance and reliability, resolve system-level issues, establish engineering practices, influence platform architecture, and mentor engineers across Azure infrastructure teams.

Lead architecture and hands-on development for Microsoft's virtualization platform, focusing on hypervisor and VMM capabilities. Design, implement, and optimize systems software across Windows, Linux, macOS, Azure, and containers. Improve performance, security, reliability, testing, and operational readiness; diagnose low-level hardware/software issues; enable virtualization on new silicon; mentor engineers; and influence platform strategy across teams and hardware partners.

Lead development of a massively distributed edge compute platform. Design fault-tolerant systems, external APIs, high-throughput traffic routing, and Kubernetes-based resource management. Establish architecture standards, reliability metrics, security practices, and technical governance. Collaborate with AI/ML, hardware, networking, and security teams; communicate risks to executives; manage customer requirements; review code; and mentor engineers on distributed systems best practices.

Develop, maintain, and optimize mission-critical backend APIs and scalable cloud services for web and mobile clients. Implement secure, high-performance systems, automated tests, observability, and technical documentation. Mentor peers, follow best practices, and support a proof-of-concept launch and fundraising activities as a volunteer contributor.

Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.

Volunteer Principal Front End Developer to build React/React Native web and mobile features, mentor engineers, implement scalable full‑stack solutions, ensure cross‑browser compatibility and testing, work with Node/MongoDB/AWS, attend weekly standups, and support a fundraising launch. Minimum 4 hours/week commitment.