Top Principal Engineer Jobs in Boston, MA

Lead architecture and technical direction across multiple engineering teams. Drive large-scale refactoring, domain decomposition, cross-team technical decisions, AI-native engineering practices, production coding, testing, observability, reliability, technical planning, and engineering standards. Mentor senior technical staff, influence hiring and leveling, and partner with Product, Design, and engineering leadership to deliver foundational platform improvements.

Lead architecture and implement large cross-cutting initiatives on a SaaS grantmaking platform. Produce high-quality full‑stack code (Rails/React/Node), mentor engineers, drive SDLC best practices, and champion AI-assisted development while collaborating with product, infra, and QA teams.

Provides technical leadership for signal and power integrity across HPE storage platforms. Defines SI/PI strategies, PCB stackups, routing and validation standards; architects high-speed SerDes systems; leads simulations, laboratory correlation, root-cause investigations and cross-functional technical reviews. The role evaluates emerging technologies, mentors engineers, drives innovation through patents and publications, and serves as the final escalation point for complex SI/PI decisions.

Owns company-critical, long-term technical problems across multiple teams and organizations. Defines technical strategy, architectures, roadmaps, and engineering standards for large-scale customer-facing systems. Remains hands-on in software development while driving AI adoption in products and engineering workflows. Partners with senior product, engineering, and executive leaders to resolve complex problems, improve reliability and performance, and shape Dropbox’s technical direction.

Define Scribd’s technical vision for agentic engineering and establish architecture, patterns, and guardrails for AI-assisted software development. Lead internal developer tools, libraries, platforms, and engineering workflow improvements across codebases, CI/CD, and infrastructure. Partner with engineering leadership on ambiguous cross-organizational initiatives, mentor senior and staff engineers, and drive adoption of coding-agent capabilities throughout the organization.

Lead architecture and design of advanced mixed-signal CMOS ICs for pin electronics testing. Responsibilities include PLL design, multi-GHz clock distribution, multi-chip synchronization, phase interpolation, timing-error correction, and receive-path architecture involving CTLE, PGA, and A/D converters. The role requires multiple tapeouts, analog/RF design expertise, PCB and RF measurement experience, and technical leadership in high-performance semiconductor development.

Lead reliability and systems testing for physically embodied AI products. Define reliability requirements, test plans, acceptance criteria, and lab capabilities; build fixtures, instrumentation, automation, and reporting tools; conduct durability and lifetime testing; investigate failures and root causes; guide corrective actions; assess release readiness; and collaborate with hardware, software, AI, manufacturing, operations, and external labs.

Designs and technically directs pulsed power components and systems, including pulse modulators, switches, and transmitters. Responsibilities include assessing customer requirements, developing technical solutions, leading complex analyses and testing, reviewing engineering drawings, improving designs and processes, and training engineers. The role requires independent work, advanced pulsed power expertise, and leadership across design, fabrication, testing, and production activities.

Leads development, evaluation, optimization, and troubleshooting of CT imaging technologies. Analyzes image quality and complex datasets, develops image processing and reconstruction algorithms, designs experiments, defines performance metrics, and supports system verification and validation. Collaborates with Engineering, Manufacturing, Quality, and Service to resolve technical issues, improve system performance, and maintain documentation. Provides technical leadership and mentorship to imaging engineers.

Designs, implements, and improves secure, scalable Microsoft Azure solutions, including landing zones, networking, identity, governance, infrastructure automation, CI/CD, monitoring, and hybrid connectivity. Leads complex cloud initiatives, establishes architecture and engineering standards, troubleshoots incidents, optimizes reliability and costs, develops operational practices, mentors engineers, and collaborates with technical and business stakeholders on modernization and platform adoption.

Lead the architecture and implementation of NVIDIA’s large-scale data retrieval platform for foundation-model training. Build web crawling, source discovery, indexing, scheduling, fetching, ingestion, provenance, and policy-enforcement systems. Ensure production reliability, scalability, observability, and cost efficiency while supporting open-web, licensed, partner, code, STEM, and multimodal data. Partner across engineering, research, product, legal, privacy, and governance teams, mentor engineers, and set technical direction.

Lead architecture and hands-on development for AccessOne’s financing platform across frontend, backend, data systems, integrations, and cloud infrastructure. Modernize production systems, build accurate and auditable financial workflows, lead complex initiatives through deployment, and establish engineering practices. Use AI coding tools responsibly while ensuring software quality, security, testing, reliability, and maintainability.

Own the architecture, roadmap, reliability, and scalability of AlphaSense’s cloud-native Data Platform. Build large-scale data migration capabilities across cells, regions, and geographies; enable self-service storage provisioning; and drive data placement, replication, tenant routing, and isolation. Partner with Cloud Platform, SRE, and DevEx teams, establish managed-first standards, identify scalability risks, contribute code across teams, and mentor senior engineers.

Principal Engineer responsible for defining technical vision, designing and delivering large-scale distributed systems, writing production code, and guiding major architectural decisions. The role establishes engineering standards, develops reusable systems, mentors senior engineers, supports roadmap and resource planning, and contributes to technical hiring. Key work includes cloud infrastructure, data architecture, AI/ML and LLM systems, monolith-to-microservices migrations, scalability, reliability, security, performance, and observability.

Develops advanced signal processing and machine learning algorithms for radar, RF sensing, and electronic warfare applications. The role involves customer engagement, system capability development, prototype demonstrations, subsystem requirements, technical leadership, proposal support, and collaboration with multidisciplinary engineering and research teams. The engineer will lead researchers and apply algorithms from mathematical derivation through testing and performance verification.

Provides technical leadership for semiconductor product enablement from development through qualification, technology transfer, manufacturing ramp, and high-volume production. Connects product requirements with device physics, silicon technology, process integration, fab execution, yield, reliability, and product performance. Leads device development, process transfers, technical problem resolution, data analysis, risk mitigation, qualification, technology roadmaps, and manufacturing strategy while mentoring senior engineers.

Principal Engineer responsible for architecting, building, testing, deploying, and operating full-stack TypeScript applications. The role leads React and Next.js front ends, Node.js services, APIs, cloud infrastructure, integrations, databases, CI/CD, observability, security, and AI capabilities. It owns products end to end, establishes engineering standards, partners with creative and operations teams, and provides technical leadership on client projects. Strong autonomy, communication, architecture, and production operations skills are required.

Architects and optimizes embedded Layer 2/Layer 3 protocol stack software for 4G/5G cellular systems. Develops new product capabilities, interprets communications standards, troubleshoots complex customer defects, and collaborates with distributed engineering teams to integrate, validate, and improve system performance.

Lead design and build of production-ready cloud and AI systems, prioritize security and reliability, ship solutions quickly using modern engineering practices, collaborate with cross-functional teams, mentor engineers, drive customer adoption, and deliver reusable assets and end-to-end complex deliveries.

Develop and lead enterprise full-stack applications using Java, Spring Boot, Node.js, React, AWS, APIs, and distributed technologies. Design scalable architectures, modernize applications, establish engineering standards, troubleshoot production issues, improve observability and performance, and support containerization and site reliability. Mentor engineers, collaborate with product and cross-functional teams, guide technical decisions, and drive agile delivery, automated testing, CI/CD, and resolution of technical debt.

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.

Designs and validates robotic fulfillment and materials-handling solutions from pre-sales through customer implementation. Collaborates across engineering, product, sales, operations, vendors, and customers to develop system designs, analyze performance, manage simulations, certify site outcomes, resolve specification discrepancies, and standardize software and hardware integrations. The role also builds best practices, supports customer and partner onboarding, and helps establish processes for a new applications engineering team.

Lead architecture, development, optimization, validation, and production deployment of reusable audio DSP components across multiple product platforms. Translate MATLAB/Simulink algorithms into optimized C/C++ for embedded DSPs and processors, guide fixed- and floating-point implementations, perform hardware bring-up and lab debugging, and establish validation and engineering standards. Mentor engineers and provide technical direction across distributed, cross-functional teams.

Own the implementation, hardening, and polish of game AI behaviors and systems for shipping. Collaborate with design, animation, and other disciplines to tune AI features and support the creative vision. Ensure reliable, stable enemy behaviors and enhance existing architecture. The role requires deep Unreal Engine and modern game AI experience, strong C++ skills, animation systems knowledge, and at least one shipped game title focused primarily on AI.

Lead end-to-end technical initiatives for an IoT cloud platform, shaping architecture, strategy, and roadmap. Build and scale React/TypeScript frontends, Python backends, cloud infrastructure, databases, and data systems. Improve developer experience, operate production systems, establish engineering standards, mentor engineers, and influence technical direction across teams. Collaborate closely with product and design while delivering reliable systems for monitoring, debugging, and updating connected devices.