Top Principal Software Engineer Jobs in NYC, NY

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

Lead technical strategy, architecture, and implementation for ML inference platform services. Design and scale distributed, high-throughput inference systems, collaborate across teams, drive availability, scalability, operational excellence, cost management, and provide company-wide technical direction and mentorship.

Lead technical direction and architecture across telehealth, EHR, patient and clinician systems. Be a hands-on principal engineer writing production code, set engineering standards, mentor and direct offshore teams, own reliability and security (HIPAA/compliance), drive AI adoption, hire and build the onshore engineering org, and partner with the CEO to translate business and clinical needs into technical plans.

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.

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.

Lead technical ownership of a global platform for safe change: distributed key-value storage, progressive configuration delivery, testing and health-mediation. Write production code, design systems, review senior proposals, integrate LLMs, and drive cross-team initiatives to improve reliability, rollout safety, and developer productivity.

Design and build next-generation ads formats, backend infrastructure, and scalable distributed systems. Lead technical direction, collaborate across teams to define product requirements, experiment, analyze and optimize ad performance, and ensure availability, scalability, operational excellence, and cost management. Mentor engineers and apply AI tools and high-velocity workflows to deliver production-ready systems.

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 design automated ad serving systems, lead technical direction, collaborate with teams, and mentor engineers.

Lead architecture and implementation of a scalable data lakehouse and streaming platform. Define technical strategy, build resilient systems, optimize performance, mentor engineers, and partner across teams to enable analytics and ML use cases using modern data platform technologies.

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.

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.

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

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 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.

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.

As a Principal Engineer, you will lead AI-driven backend systems for audit products, ensuring scalable, reliable workflows while mentoring teams and influencing technical direction.

Lead enterprise architecture and long-term technology strategy; design and deliver highly scalable, fault-tolerant distributed systems; drive microservices transformation, reliability engineering, observability, CI/CD and DevOps standards; mentor senior engineers and lead cross-team technical initiatives.

Build and own AI-native, full-stack systems across underwriting, claims, operations, and member products. Ship end-to-end products using frontend, backend, and AI infrastructure, redesign workflows, automate manual operations, and collaborate directly with operational teams to scale insurance systems.

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.

Architect and implement enterprise GenAI platforms (RAG and agentic systems), design knowledge retrieval, orchestration, tool-using agents and human-in-the-loop workflows, ensure production readiness and governance with product/data/security teams, define platform engineering best practices, and solve complex platform challenges with broad autonomy.