Top Principal Software Engineer Jobs in Austin, TX

Sets enterprise technical direction for embedded software engineering platforms supporting software-defined vehicles. Defines multi-year architecture, standards, governance, quality gates, build and test modernization, CI/CD strategy, and platform roadmaps. Resolves cross-domain technical risks, advises senior leadership, drives adoption across organizations and suppliers, establishes measurable engineering improvements, and mentors senior technical leaders. The role may specialize in virtualization and CI infrastructure, quality gating, test-system modernization, or build-system modernization.

Leads technical strategy for developer experience platforms, golden paths, CI/CD workflows, automation, self-service tooling, and AI-assisted engineering. Defines developer productivity metrics, analyzes SDLC signals, improves engineering workflows, establishes standards and reference architectures, and influences cross-functional leaders. Mentors engineers and drives adoption of reliable, secure, scalable tools and practices across General Motors.

Lead and mentor an engineering team in developing advanced solutions for defense-related technologies, ensuring effective design, development, and integration processes.

As a Senior Principal Engineer, you'll define and drive the technical strategy for customer experience platforms, lead architectural decisions, and mentor engineering teams to enhance customer and agent experiences.

Develop high-quality real-time embedded software for electronic defense systems, including aircraft protection, radar warning, and electronic attack platforms. Collaborate with systems, hardware, and test engineers throughout the software development lifecycle. Perform software integration testing, Agile development, automated unit testing, and Linux-based development while contributing to complex distributed and safety-critical systems.

Design, build, deploy, and maintain resilient, scalable production systems for Toast’s retail customers. The role sets long-term technical architecture and strategy, communicates technical direction, mentors senior engineers, improves engineering productivity, diagnoses performance issues, and drives initiatives amid ambiguity. Engineers collaborate directly with retail customers, visit stores, understand operational workflows, and use AI tools to improve development velocity and quality.

Design, build and own a petabyte-scale self-service real-time data enrichment platform. Lead query processing, ingestion pipelines, storage, indexing and performance optimization using Spark/Flink and Apache ecosystem tools. Deliver unified data catalog, improve query performance and platform efficiency, collaborate on technical reviews, and enable internal and external customers to query and extract data efficiently.

Lead architecture, design, and delivery of PET product features; write production full‑stack code; champion testing, observability, CI/CD and operational readiness; mentor engineers and collaborate with product to shape technical roadmap.

Lead architecture and implementation of a company-wide data lakehouse platform and services (ingestion, pipelines, governance, access control, semantic layer, dashboards). Build and scale data infrastructure; work across Trino, Iceberg, ClickHouse, PostgreSQL and cloud-native stack; mentor engineers; collaborate with stakeholders to deliver data products and agentic AI-first tooling.

Provides senior technical leadership for complex software engineering programs supporting electronic warfare, secure communications, radar warning, and electronic attack systems. Responsibilities include designing, implementing, testing, and evaluating C++ software in Linux environments; presenting technical designs to customers; mentoring engineers; improving development processes; and collaborating with systems, hardware, and test teams throughout the product lifecycle. The role is fully onsite and requires an active DoD Secret clearance.

Lead architecture and technical execution for Toast’s Payroll and Team Management products. Own authentication, authorization, and organizational hierarchy across a multi-tenant SaaS platform. Drive high-scale, full-stack initiatives, modern agentic development practices, integrations, technical strategy, quality standards, deployment practices, and cross-functional collaboration. Mentor engineers across teams and leverage AI tools and LLM integration to improve software development velocity and quality.

Lead design and development of complex embedded C++ software for SIGINT, radar, and electronic-warfare systems. Mentor teams, produce design and project documentation, perform integration and testing, evaluate designs, and drive DevSecOps and container-based deployment and verification practices.

Develop and integrate C++ software for electronic warfare, SIGINT, and related defense systems. Collaborate with systems, hardware, and test engineers, interact with customers, prioritize backlog, participate in milestone reviews, evaluate complex designs, and support automated digital delivery and verification activities.

Lead Windows low-level software development for silicon bring-up, platform validation, and product enablement. Prototype and evaluate hardware/software designs, debug system-level issues across silicon/firmware/drivers, analyze performance, and build scalable automation, diagnostic, and regression test frameworks in collaboration with cross-functional and external partners.

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.

Build, maintain, monitor, and scale enterprise platform services spanning IAM, communications, payments, and API gateways. Design highly available and fault-tolerant products, evaluate technical tradeoffs, contribute to platform roadmaps and technical strategy, and collaborate with product, architecture, and design teams. The role also mentors engineers, promotes software quality and operational excellence, and applies backend platform engineering, API, messaging, DevOps, and AI-assisted development expertise.

Lead design, build, deployment, and operation of highly resilient, high-throughput configuration and publishing systems. Define long-term architecture and strategy, mentor senior engineers, diagnose and fix performance bottlenecks, and leverage AI tools to improve engineering productivity and platform capabilities.

Lead architecture and evolution of the Workers control plane, re-engineer core services for scale, own system stability and efficiency, define benchmarks, participate in on-call, mentor senior engineers, represent the team in design forums, and evaluate/apply emerging technologies including AI to improve the developer platform.

Lead development of core client systems and engine-level infrastructure in Unity/C#. Diagnose and fix cross-cutting performance issues, upgrade third-party SDKs, evolve build tooling, produce design docs, scope multi-week infrastructure initiatives, mentor engineers, and drive profiling, optimization, and architecture changes to enable future features.

Lead the design and development of scalable document-processing systems for healthcare workflows. Build Go services and AWS Step Functions pipelines, solve large-scale PDF processing challenges, implement observability, optimize PostgreSQL/RDS performance, and support OpenSearch indexing. Provide architectural direction, mentor engineers, translate ambiguous requirements into shipped solutions, and ensure reliable handling of sensitive PHI under HIPAA requirements.

Leads company-wide technical strategy and architecture for foundational construction workflow platform services. Establishes standards, reference patterns, and multi-year technology vision across distributed systems, data, web, mobile, APIs, and AI-native architectures. Remains hands-on for high-impact prototypes and critical initiatives while mentoring senior engineers, driving architecture reviews, and influencing executives and engineering divisions. Partners with product, UX, business, and executive leaders to align technology strategy and deliver scalable, resilient systems.

Provides hands-on technical leadership for Pantheon’s P1 zero-to-one product and company-wide engineering strategy. Owns architecture across real-time collaboration, APIs, data, publishing, integrations, and developer experience; establishes reliability, security, observability, and delivery standards; guides build-versus-buy decisions; mentors senior engineers; partners with product, design, security, infrastructure, and customers; and contributes code to validate architecture and unblock critical initiatives.

Lead architecture and roadmap for Azure PostgreSQL systems; design and review scalable, maintainable database engine features (query processing, storage, transaction logging, recovery, versioning, IO, scale-out). Influence coding standards and run code reviews, write proof-of-concept or production code, contribute to open-source PostgreSQL/Linux, and participate in rotational on-call operations.

Lead the architecture, technical strategy, and roadmap for Microsoft's Windows ML compiler stack. Design high-performance compiler infrastructure, execution engines, optimization frameworks, and developer tools supporting CPU, GPU, and NPU workloads. Drive NPU enablement, graph optimization, scheduling, memory management, code generation, and hardware abstraction. Partner with silicon vendors and internal teams, influence AI hardware and platform strategy, lead cross-team initiatives, and mentor engineers developing on-device and generative AI capabilities.

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.