Top Principal Engineer Jobs in NYC, NY

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.

Owns the technical direction and evolution of Microsoft Ads’ high-throughput, low-latency real-time bidding platform. Leads scalable backend design, modernization, performance optimization, reliability, observability, experimentation, and safe production changes. Collaborates with engineering, data science, product, infrastructure, and business teams while providing architectural leadership and mentorship. The role focuses on supporting platform scale, operational excellence, and future advertising growth.

Build and operate Anthropic’s capacity and compute infrastructure, including allocation and planning systems, utilization and efficiency instrumentation, multi-cloud data pipelines, cost attribution, forecasting, and Kubernetes-native tooling. The role requires production-quality Python and SQL, observability with Prometheus and Grafana, cloud operations, cross-functional collaboration, and ownership of reliable data products, monitoring, SLOs, and on-call systems.

Design, develop, and maintain scalable AI-forward APIs, Model Context Protocols, and services for M365 data access. Lead features from concept through launch, write reusable code, estimate work, monitor production systems as an on-call DRI, improve reliability and scalability, and mentor engineers.

Lead the mobile engineering team in evolving iOS and Android applications toward an AI-native, thin-client architecture. Define participant API and platform direction, contribute Python to backend services, establish AI-assisted development processes, improve DevOps and continuous delivery, mentor engineers, and partner closely with Product and Design. The role requires principal-level technical leadership, product focus, system architecture expertise, and hands-on use of AI coding agents.

Provides technical leadership on complex, high-impact engineering projects from design through launch. The role involves architecture, company-wide initiatives, engineering excellence, mentoring technical leaders, and establishing standards for scalable, reliable, secure, observable systems. The engineer will collaborate across teams, communicate complex technical topics, and apply customer-focused decision-making and A/B testing techniques.

Lead high-impact AI solutions, overseeing architecture and deployment. Partner with stakeholders, coach engineers, and drive project success from inception to launch.

Develop Python-based margin calculation, collateral optimization, analytics, and rule-engine solutions for securities finance. Integrate pricing, risk, and collateral platforms through APIs and distributed processing. Build Angular and Next.js applications for margin workflows, dashboards, and alerts. Optimize performance, automation, and cloud-native deployments while partnering with Quant, Risk, and Operations teams. The role requires deep capital-markets software development experience, quantitative programming skills, and knowledge of margin, derivatives, repo, securities lending, and collateral management.

Principal Engineer serving as the CTO’s technical deputy, leading day-to-day engineering execution, architecture, code reviews, developer support, and delivery. The role requires hands-on full-stack development across databases, backend, frontend, cloud infrastructure, and DevOps. It also champions AI-agent-assisted development by establishing workflows, guardrails, and quality standards. The engineer will mentor teammates, resolve technical blockers, improve reliability and documentation, and collaborate with technical, product, and research stakeholders.

Own the architecture and evolution of PermitFlow’s platform, monorepo, shared services, infrastructure, and agentic software development lifecycle. Lead architectural standards, migrations, AI-assisted code review, test generation, CI gates, observability, and background coding agents. Work across the stack as a product engineer while establishing scalable foundations adopted by multiple teams. The role requires deep platform engineering expertise, production infrastructure experience, and the ability to influence technical direction across the organization.

Design, build, and operate large-scale, highly available platform services across GitHub (Actions, Enterprise AI, Identity, Billing, Git systems, database infrastructure). Provide technical leadership, mentor engineers, own architecture and APIs, participate in on-call incident response, drive reliability, security, testing, and roadmap decisions across cross-functional teams.

Leads architecture, reliability, and automation for cloud network foundations across AWS, GCP, Azure, and internal infrastructure. Designs routing, segmentation, firewalls, connectivity, access, and infrastructure-as-code systems; establishes SLOs, monitoring, incident response, and recovery practices. Builds reusable automation, improves change safety, partners across platform, security, IT, and engineering teams, serves as a senior escalation point, creates operational standards, and mentors engineers.

Principal Software Engineer responsible for designing scalable software frameworks, developing secure production code, and leading code quality and operational stability. The role architects agentic AI-enabled engineering workflows, establishes responsible AI guardrails, and drives automation across teams. It also provides technical expertise, advises senior stakeholders, develops reusable engineering methods, and leads adoption of cloud-based solutions using GCP or AWS and Python, Java, or Go.

Own the architecture and roadmap for Salesforce and connected revenue applications. Lead complex customizations, integrations, security models, release processes, and technical standards. Translate revenue-team needs into scalable solutions, evaluate vendors and technology stacks, troubleshoot critical issues, and reduce technical debt. Mentor developers and administrators, influence cross-functional stakeholders, and guide adoption of automation, AI, and new platform capabilities across global revenue operations.

Lead the US Platform squad while remaining hands-on in production code. Own contracts across payments, bank connectivity, risk, and infrastructure; build complex cross-domain changes; maintain API specifications and contract tests; lead critical incident responses; and conduct load testing, failure drills, and capacity planning. The role requires deep distributed systems expertise, payment-platform experience, technical leadership, product judgment, and practical use of AI in regulated systems.

Build and ship cloud-native supply chain features using .NET, PostgreSQL, and AWS serverless technologies. Design complex capabilities including OEM support and payments, maintain modular architecture, and establish reliable event-driven systems. Lead production readiness through observability, incident response, and root-cause analysis. Apply AI-assisted development, TDD, code reviews, mentoring, and GitHub-based CI/CD while contributing to a new platform from its first commit.

Build secure, reliable cloud and AI software solutions from prototype through production. Partner directly with customers and multidisciplinary teams to translate business goals into technical requirements, architect scalable services, and deliver measurable outcomes. Provide technical leadership, mentor engineers, establish reusable frameworks, apply responsible engineering practices, and support deployment, observability, adoption, and knowledge transfer. The role may involve designing and operating AI or LLM-based systems and traveling up to 25%.

Designs, builds, and operates core distributed systems for Serverless Elasticsearch. Responsibilities include improving concurrent indexing, cluster coordination, scalability, resilience, and performance across nodes and petabytes of data. The role investigates complex concurrency and stability issues, supports support engineers, owns operational resolutions, and leads projects across multiple engineers and teams.

Leads the technical vision, architecture, and execution of AI performance, framework, benchmarking, and developer-productivity initiatives. Drives cross-team architecture, resolves complex systems trade-offs, mentors technical leaders, and contributes hands-on through prototyping, implementation, reviews, debugging, observability, and automation. Delivers measurable improvements in model onboarding speed, runtime performance, reliability, hardware utilization, and Azure capacity efficiency across models, frameworks, compilers, runtimes, systems, services, and hardware.

Leads the design and implementation of highly scalable Azure messaging and PubSub services. Defines architecture, testing strategies, coding standards, and reusable engineering frameworks; mentors engineers and conducts design and code reviews. Drives incident response, root-cause analysis, service reliability, SLA compliance, and operational improvements. Partners with stakeholders and customers to shape requirements and product direction, while advancing responsible AI practices throughout the software development lifecycle.

Principal Software Engineer leading architecture and hands-on development for Swiftly’s multi-tenant ads and martech platform. Responsibilities include designing distributed systems, migrating legacy services without downtime, optimizing a low-latency Go ad server, defining database and service contracts, integrating ad-tech platforms, operating Azure production services, and setting engineering quality standards across testing, observability, CI/CD, security, and infrastructure.

Develop and update detailed mechanical designs, models, drawings, and assemblies for complex accelerator systems. Use Creo and Windchill to manage designs, revisions, and released documentation. Apply GD&T and design-for-manufacturability principles while collaborating with engineering, manufacturing, technicians, and operations teams. Support configuration management, engineering changes, design reviews, troubleshooting, prototype fabrication, assembly modifications, and applicable pressure-system and ASME B31.3 requirements.

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.

Provides senior technical leadership and hands-on Salesforce development across an application portfolio. Designs scalable cloud applications, leads Agile and DevOps practices, develops Apex and Lightning Web Components, manages architecture and data, drives performance and quality improvements, troubleshoots complex issues, and mentors engineering teams. The role also supports technical strategy, research, prototypes, open-source engagement, and collaboration with management and clients.