Top Principal Software Engineer Jobs in NYC, NY

The Principal Software Engineer will lead architecture, mentorship, and technical execution for scalable systems, influencing product strategies.

Lead the design and implementation of an Internal Developer Portal. Mentor engineers, drive automation standards, and enhance engineering productivity for Mastercard's software development teams.

This role involves leading technical projects across multiple teams, designing scalable systems, collaborating with cross-functional teams, and mentoring engineers, focusing on payroll and tax systems at Gusto.

Lead technical strategy and architecture for Developer Experience: build scalable build/test/delivery systems, improve CI/CD throughput, design internal platforms/APIs/SDKs/CLIs, integrate LLM/agentic tooling safely, mentor senior engineers, and drive cross-team initiatives to increase engineering velocity, reliability, and maintainability at organizational scale.

The Principal Software Engineer will develop ads infrastructure, lead technical direction for the Ads Platform, and ensure high availability and performance of systems. Responsibilities include collaborating across teams and advocating for best practices.

Lead architectural decisions, mentor engineers, and drive technical strategies for scalable software systems, focusing on high-quality solutions and system health.

The Principal Software Engineer will design and implement systems for the advertiser experiences at Snap, lead technical vision, mentor engineers, and innovate on creator marketplace products.

The Principal Software Engineer will design and scale engineering components, lead projects, advocate best practices, and influence technical direction across teams.

Lead design and build of scalable backend systems and data platforms; own architecture and production deployments; improve reliability, performance, and observability; mentor engineers and collaborate with Product, Data Science, SRE, and Security.

The Principal Software Engineer will architect shared application libraries, improve CI/CD pipelines, mentor engineers, and drive technical direction across mobile and OTT platforms for NBC News.

Lead frontend architecture and implementation for a high-performance SPA and Node.js BFF. Solve algorithmic, concurrency, and memory challenges, optimize performance and builds, drive observability, security, and CI/CD, mentor engineers, and collaborate with product, UX, and SRE teams to deliver resilient, distributed real-time collaborative features.

The Principal Software Engineer will design automated ad serving systems, lead technical direction, collaborate with teams, and mentor engineers.

Lead the technical vision for Mastercard's corporate platforms, modernizing systems and data architecture, ensuring compliance and driving innovation.

Lead technical architect and hands-on principal engineer for the SOC Experience team, building scalable investigation workflows, agentic LLM features, automation, remediation actions, and analyst tooling. Drive architecture, mentor engineers, prototype solutions, ensure reliability and observability, and partner with product, UX, and SOC stakeholders to turn operational problems into auditable, production-grade systems.

The Principal Software Engineer, Senior Architect will lead architecture decisions modernizing Mastercard's Corporate Technology Solutions, focusing on data architecture, enterprise scale platforms, and ensuring technical excellence across teams.

Lead enterprise data architecture for Mastercard, modernizing data platforms and ensuring compliance, security, and operational excellence in a hybrid cloud environment.

Lead design, development, and delivery of mission-critical SIEM platform features. Define technical vision, own quality and uptime, mentor engineers, collaborate cross-functionally, build AI-assisted workflows, and drive performance, monitoring, and architecture decisions.

Lead the architectural design and development of a new consumer credit product, focusing on backend systems, distributed services, and integrating AI tools. Mentor team members and influence product direction through engineering insights.

Lead long-term technical strategy and execution across multiple teams, architecting and evolving foundational frontend/backend systems and platforms at massive scale. Drive AI/ML adoption, solve ambiguous, high-impact problems, remain hands-on in critical system design and implementation, and align senior leaders on roadmaps and engineering standards.

The role involves building and optimizing a machine learning and simulation platform, supporting MLOps, model deployment, and infrastructure modernization, while mentoring engineers.

Provide technical leadership for internal platforms and security automation supporting Upstart Bank. Lead architecture, design, and implementation of platform services, APIs, relational schemas, authentication and RBAC systems. Partner with risk, compliance, and operations stakeholders, mentor engineers, mitigate technical risks, and drive long-term platform strategy and engineering standards.

The Principal Software Engineer will define technical roadmaps, guide system architecture, mentor leaders, and drive product direction in Capital Supply operations.

Lead and mentor an engineering team building GovIntel and GovChannel product capabilities. Own technical direction, design and deliver scalable SaaS features, APIs, integrations, and platform reliability. Partner with Product, QA, Cloud Ops, and stakeholders to prioritize work, drive CI/CD and observability practices, lead reviews and incident response, and apply AI-assisted tools to improve development speed and quality.

Lead design and implement proofs-of-concept, SDKs, and samples for new Auth0 products focused on identity for GenAI. Drive industry protocols and recommendations, research market opportunities, and shape product strategy while being hands-on in architecture and development.

Lead technical strategy and build scalable Salesforce and data integrations. Architect CRM-to-data-platform pipelines, enterprise data products, and AI-powered developer tools. Mentor engineers, define data quality and observability standards, and drive production troubleshooting and platform reliability across applications, integrations, and data services.