Top Principal Engineer Jobs in Boston, MA

Principal Software Developer responsible for designing, developing, and scaling distributed, high-throughput software systems. The role delivers features, improves reliability, identifies bottlenecks, leads system migrations from monoliths to microservices, and works across the technology stack. Responsibilities include architectural design, cloud engineering, technical leadership, mentoring developers, communicating technical decisions, and using AI and automation tools to improve engineering outcomes.

Lead design and implementation of large-scale Pub/Sub and messaging services within Azure Event Grid/Microsoft Fabric. Define scalable, reliable architectures, drive testing and CI/CD automation, build developer tooling, mentor engineers, manage incident response and operational excellence, and collaborate with PMs, EMs, researchers, and customers to deliver production-ready cloud services.

Architects and leads qualification, performance validation, automation, reliability, and fleet-readiness efforts for next-generation Azure Storage infrastructure. Develops tooling, telemetry, and performance analysis frameworks while partnering across Storage, Compute, Networking, Platform Engineering, and hardware teams. Provides technical leadership through architecture, incident resolution, mentorship, and engineering best practices. The role is onsite three days weekly in Redmond, Washington.

Build and operate Legion’s secure, scalable AWS and Kubernetes platform. Responsibilities include infrastructure automation, CI/CD, monitoring, alerting, incident response, operational runbooks, production support, and on-call participation. The role also develops production AI agents for SRE automation and owns a secure platform for engineering teams to build and operate agents with sandboxing, scoped credentials, integrations, cost controls, observability, and reliability guardrails.

Design, build, test, deploy, and operate scalable, secure Azure networking software and automation tools. Act as DRI, monitor production, troubleshoot incidents, run root-cause analysis, and drive reliability, performance, and cost improvements. Collaborate with PMs and architects, participate in design/code reviews, mentor engineers, and champion security, privacy, and compliance.

Senior/Principal DevOps Engineers will deliver cloud and infrastructure projects for small, medium-sized, and enterprise clients. Responsibilities include DevOps project delivery, staff augmentation, fractional retainers, and solution consulting using AWS, GCP, Azure, infrastructure-as-code, Kubernetes, Helm, Docker, and scripting languages. Strong communication and project management skills are required. Roles are available full-time or part-time as 1099 contractor engagements for US-based workers.

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.

Design and operate large-scale, AI-native cloud infrastructure (especially Kubernetes/AKS). Improve service quality, automate incident prevention/remediation, accelerate engineering productivity, and integrate AI tools into development workflows.

Lead architecture, design, and delivery of custom manufacturing equipment. Translate process requirements into mechanical systems, make build-vs-buy decisions, prototype and deploy hardware, and establish practices for in-house equipment development while mentoring a growing team.

Leads architecture and development of scalable Node.js SaaS applications and data products. Responsibilities include designing systems, translating stakeholder needs into technical backlogs, writing user stories, coordinating architecture decisions, supporting product planning, improving business processes, and mentoring engineers. The role also incorporates AI-assisted development, code review agents, LLM APIs, agentic workflows, and generative AI tools.

Lead technical strategy and architecture for Azure Storage geo-replication, data protection, failover orchestration, and business continuity. Drive cross-team delivery, operational excellence, telemetry, automation, AI-assisted operations, and represent the team in executive and customer engagements.

Lead integration-domain architecture and delivery for an AI-driven cybersecurity platform. Design and operate production microservices integrating REST, GraphQL, streaming, MCP, and LLM-based services. Make system architecture and API decisions, mentor engineers, conduct design and code reviews, improve engineering rigor, and champion AI-assisted development, testing, deployment, monitoring, and incident response.

Leads software design and development for Windows Core OS services and platforms. Partners with stakeholders to define requirements, identifies dependencies, creates design documents, and mentors engineers in producing maintainable code. Drives cross-product project and release planning, serves as a designated responsible individual, participates in on-call operations, and improves system availability, reliability, observability, efficiency, and performance.

Provides principal-level technical leadership for scalable learning and skilling platforms. Designs architectures, writes and reviews production software, leads full software lifecycles, and applies Azure, AI, Copilot, Power Platform, and custom solutions. Responsibilities include secure integrations, CI/CD, infrastructure as code, testing, observability, production support, Responsible AI, reusable components, cross-team technical alignment, and engineering mentorship.

Designs, develops, and leads scalable healthcare software solutions involving transaction processing, interoperability standards, integrations, and data platforms. Provides hands-on engineering, architectural leadership, quality ownership, risk management, technical mentorship, and cross-functional collaboration. The role requires building high-performance cloud-based SaaS solutions using microservices and serverless architectures, while guiding engineering strategy and ensuring secure, reliable delivery.

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.

Architects, deploys, and manages secure automated networking across AWS, Azure, and hybrid-cloud environments. Designs Spine-Leaf networks, optimizes Direct Connect and ExpressRoute connectivity, leads infrastructure-as-code practices with Terraform and Ansible, and drives multi-cloud network product vision. The role troubleshoots network and security issues, supports tier 3 on-call operations, collaborates with stakeholders, and creates technical documentation and knowledge-sharing presentations.

Lead design and delivery of flight-critical power electronics for the X-BAT aircraft, including inverters, DC-DC converters, and battery management. Own full hardware development cycle, drive PCB layout, harden designs for harsh environments, mentor engineers, lead reviews, and manage program timelines through production.

Lead architecture, development, and validation of end-to-end aircraft fuel systems. Drive cross-functional integration, system-level modeling (CFD), verification, supplier qualification, ground and flight test support, anomaly root-cause analysis, and mentor engineering teams while contributing to long-term fuel-system technology roadmaps.

The Senior Kubernetes Engineer will manage and enhance Kubernetes clusters, automate deployments, ensure security, and collaborate with teams to deliver reliable containerized applications.

Lead architecture and evolution of an enterprise Kubernetes platform across cloud and on-premises. Define platform roadmap, standards, and automation; design multi-cluster/multi-region solutions; implement GitOps, IaC, observability, security, and resiliency practices; mentor engineers and drive cross-functional platform initiatives for reliability, scalability, and developer experience.

Provide cross-functional systems engineering support for advanced thermal energy storage technology. Own system requirements and traceability, define subsystem interfaces, identify applicable codes and standards, lead FMEA, HAZOP, fault-tree, and risk mitigation activities, and support design reviews and test planning. The role also includes electrical systems analysis, hands-on shop-floor hardware inspection, lab troubleshooting, and collaboration across mechanical, electrical, chemical, and controls disciplines.

Build and maintain parsing infrastructure, SDKs, data models, and services for hardware design collaboration. Develop parsers for circuit-design formats, binary file-merging capabilities, test harnesses, developer tooling, and performance improvements. Collaborate with engineering, product, sales, and other stakeholders to define interfaces, requirements, timelines, and constraints while driving autonomous, cross-functional projects.

Owns and evolves the enterprise Major Incident Response, Post-Incident Review, and Problem Management programs. The role engineers ServiceNow ITSM workflows, automations, integrations, dashboards, SLA/SLO tracking, and incident escalation processes. It serves as Incident Commander for high-severity events, leads RCA and continuous improvement, manages an offshore operations team, and communicates program health to executive stakeholders. The position requires participation in on-call rotations and hybrid work onsite in Marlborough, Massachusetts.

Owns the design, operation, troubleshooting, security, documentation, and continuous improvement of Mimecast’s global corporate network. Responsibilities include managing multi-vendor infrastructure across routing, switching, wireless, SD-WAN, SASE, and out-of-band systems; leading upgrades; partnering with Security and IT teams; and using Python, Ansible, or similar automation to improve operational efficiency and configuration consistency.