Top Senior Level Software Engineer Jobs in Los Angeles, CA

Build and scale full‑stack product features and systems across frontend and backend. Own projects end‑to‑end from design through rollout and maintenance. Improve reliability, performance, observability, and scalability. Collaborate with Product and Design, mentor teammates, contribute to architecture and design reviews, and leverage AI tools to accelerate development while maintaining engineering judgment.

Lead a compliance and risk engineering pillar to design, deliver, and operate regulatory automation, AI/ML, and risk-control platforms. Own roadmap, reliability, incident and defect management, stakeholder communication with Legal/Cyber/Compliance, and hiring and growth of software and quality engineering teams across global jurisdictions.

Lead design and build of an AI-powered, spec-driven development platform: evaluate frameworks, architect end-to-end tooling, integrate with CI/CD and Kubernetes, partner with DevOps, MLE, and Security, instrument adoption and velocity metrics, and drive org-wide rollout and training to enable non-engineers to author specs.

Lead design and delivery of scalable budgeting and pacing infrastructure. Build and maintain high-performance Java production systems, collaborate with engineering and product teams, apply data-driven decision making, and ensure reliability, observability, and continuous improvement of distributed systems.

The Senior Software Engineer will design and develop flight and ground software, collaborate with cross-functional teams, and manage the complete software lifecycle.

Lead architecture, modernization, and development of Group Insurance applications. Modernize mainframe monoliths into Java microservices and micro-frontends on cloud, mentor distributed Agile teams, collaborate with enterprise architecture, product owners and infrastructure, and enable test automation and integrations. Approximately 10% domestic travel.

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 design and implementation of Neighborhoods mobile experiences across Cash App and Square. Shape cross-team architecture, stay hands-on with iOS development (SwiftUI, Workflow), drive integrations for discovery, ordering, loyalty, and fulfillment, mentor engineers, and apply AI-assisted workflows to accelerate development and quality.

Design and build features for the SFS banking platform, onboard Block products, build secure fault-tolerant systems handling sensitive financial data, ensure service reliability, remediate incidents, and create durable operational fixes.

The Staff Software Engineer will develop and execute technical strategies for Cash App Banking, lead architectural decisions, and mentor engineers, focusing on innovative financial solutions.

Lead ServiceNow implementations for enterprise customers: design, develop, integrate, and maintain scalable ServiceNow solutions (ITOM, Discovery, Service Mapping, AIOps). Build custom scripts and integrations, troubleshoot, participate in SCRUM, and work directly with customers to deliver projects on time.

Design, build, and maintain a new cross-platform Flutter app for iOS and Android. Implement state management (Riverpod/BLoC/Provider), integrate RESTful APIs, optimize performance and security, manage app lifecycle and store deployments, work in an agile CI environment, and collaborate across the product team.